JavaScript is the most popular scripting language used on web pages. It can be used to add interactivity and dynamic content to HTML pages. JavaScript code can be embedded directly in HTML pages or stored externally in .js files. JavaScript code can be placed in the <head> or <body> sections of an HTML page. Common JavaScript statements include conditional statements like if/else, loops like for and while loops, and functions. JavaScript also provides popup boxes like alert, confirm, and prompt to interact with users.
JavaScript is a scripting language that adds interactivity to HTML pages. It can be used to dynamically write text, react to events, read and write HTML elements, validate data, detect the visitor's browser, and create cookies. JavaScript code can be placed in the head or body sections of an HTML page and is usually embedded directly into HTML pages. External JavaScript files can also be used to run the same code on multiple pages.
JavaScript events allow code to run in response to user actions or changes to the document. Common events include onclick which fires when the user clicks an element, and onload which fires when a page finishes loading. JavaScript code is associated with events using HTML event handler attributes or by registering event listeners in the code. Events help make pages dynamic and interactive by triggering JavaScript functions in response to user input.
The document provides information on JavaScript fundamentals including:
- JavaScript is an object-oriented scripting language used to make web pages interactive. It was originally called LiveScript and developed by Netscape.
- JavaScript can be used for both client-side scripting in web browsers and server-side scripting using Node.js. It is an interpreted language that is loosely typed, prototype-based, and supports operators, control structures, and functions.
- Common uses of JavaScript include form validation, dynamic updating of content, and basic interactivity on web pages. It works with HTML and CSS to create dynamic web pages.
The document provides an overview of JavaScript including its history, uses, and how to implement it. Some key points covered include:
- JavaScript was originally created by Netscape under the names Mocha and LiveScript, and is now known as ECMAScript. It is an interpreted scripting language that can be added to HTML pages or linked via external files.
- JavaScript can be used to make web pages more dynamic by manipulating HTML objects, validating forms, detecting browsers, and handling events. It runs in the browser rather than on the server.
- The document discusses different ways of implementing JavaScript including embedding it directly in HTML, linking external .js files, and issues around browser compatibility.
-
Java Script is one of the most pervasive languages found on the internet and World Wide Web. Java Script is useful in making web pages more interactive. The pages can be made to react to the actions of the users in the form of special effects, both visual and otherwise.
This document provides an overview of JavaScript fundamentals including a brief history of JavaScript, its uses, language features, inclusion of scripts in HTML documents, and the JavaScript object model. It discusses the window object and properties like location, frames, history. It also covers variables and data types, operators, control structures, arrays, functions, and communicating with the user through prompts, alerts and changing the status bar.
This document provides an overview of JavaScript including:
- JavaScript is an interpreted programming language that allows adding interactivity to HTML pages.
- It is commonly used for client-side scripting of web pages in browsers.
- Core JavaScript concepts like variables, data types, operators, and functions are introduced.
- Different types of loops in JavaScript like for, for/in, while and do/while loops are explained.
- Best practices for including JavaScript code in HTML files using <script> tags are covered.
JavaScript is a scripting language that adds interactivity to HTML pages. It works in all major browsers and is used to build dynamic web pages. JavaScript can react to events, modify HTML elements, validate forms, detect browsers, and write cookies. It is commonly placed in <script> tags within HTML pages or linked via external .js files. Comments are added to explain JavaScript code and prevent execution.
JavaScript is a scripting language that adds interactivity to HTML pages. It can be used to dynamically write text, react to events, read and write HTML elements, validate data, detect the visitor's browser, and create cookies. JavaScript code can be placed in the head or body sections of an HTML page and is usually embedded directly into HTML pages. External JavaScript files can also be used to run the same code on multiple pages.
JavaScript events allow code to run in response to user actions or changes to the document. Common events include onclick which fires when the user clicks an element, and onload which fires when a page finishes loading. JavaScript code is associated with events using HTML event handler attributes or by registering event listeners in the code. Events help make pages dynamic and interactive by triggering JavaScript functions in response to user input.
The document provides information on JavaScript fundamentals including:
- JavaScript is an object-oriented scripting language used to make web pages interactive. It was originally called LiveScript and developed by Netscape.
- JavaScript can be used for both client-side scripting in web browsers and server-side scripting using Node.js. It is an interpreted language that is loosely typed, prototype-based, and supports operators, control structures, and functions.
- Common uses of JavaScript include form validation, dynamic updating of content, and basic interactivity on web pages. It works with HTML and CSS to create dynamic web pages.
The document provides an overview of JavaScript including its history, uses, and how to implement it. Some key points covered include:
- JavaScript was originally created by Netscape under the names Mocha and LiveScript, and is now known as ECMAScript. It is an interpreted scripting language that can be added to HTML pages or linked via external files.
- JavaScript can be used to make web pages more dynamic by manipulating HTML objects, validating forms, detecting browsers, and handling events. It runs in the browser rather than on the server.
- The document discusses different ways of implementing JavaScript including embedding it directly in HTML, linking external .js files, and issues around browser compatibility.
-
Java Script is one of the most pervasive languages found on the internet and World Wide Web. Java Script is useful in making web pages more interactive. The pages can be made to react to the actions of the users in the form of special effects, both visual and otherwise.
This document provides an overview of JavaScript fundamentals including a brief history of JavaScript, its uses, language features, inclusion of scripts in HTML documents, and the JavaScript object model. It discusses the window object and properties like location, frames, history. It also covers variables and data types, operators, control structures, arrays, functions, and communicating with the user through prompts, alerts and changing the status bar.
This document provides an overview of JavaScript including:
- JavaScript is an interpreted programming language that allows adding interactivity to HTML pages.
- It is commonly used for client-side scripting of web pages in browsers.
- Core JavaScript concepts like variables, data types, operators, and functions are introduced.
- Different types of loops in JavaScript like for, for/in, while and do/while loops are explained.
- Best practices for including JavaScript code in HTML files using <script> tags are covered.
JavaScript is a scripting language that adds interactivity to HTML pages. It works in all major browsers and is used to build dynamic web pages. JavaScript can react to events, modify HTML elements, validate forms, detect browsers, and write cookies. It is commonly placed in <script> tags within HTML pages or linked via external .js files. Comments are added to explain JavaScript code and prevent execution.
JavaScript is the world's most popular programming language. It is used to add interactive effects to web pages. JavaScript code can be inserted into HTML pages between <script> tags. Common JavaScript statements include conditional statements like if/else and loops. Variables are used to store and manipulate data in JavaScript. Common data types include strings, numbers, booleans, arrays, and objects. Functions allow code reuse and organization. Operators are used to assign values, compare values, and perform arithmetic. jQuery is a popular JavaScript library that simplifies DOM manipulation and event handling.
JavaScript is a scripting language that allows dynamic interactivity on websites. It was invented by Brendan Eich to provide dynamic functionality to HTML documents. JavaScript can be used for simple tasks like image galleries and button clicks, as well as complex applications, games, and animations. JavaScript itself is compact but can be extended through APIs, frameworks, and libraries to unlock additional functionality with minimal effort.
This document provides an introduction to JavaScript, covering topics such as:
- The scope of the lesson includes an introduction to JavaScript, using JavaScript code, syntax, data types, objects, strings, functions, and standard popup boxes.
- JavaScript is a client-side scripting language that allows interactivity on web pages by modifying HTML content and handling events. It is interpreted by web browsers rather than compiled.
- JavaScript code can be embedded directly in HTML, or linked via external .js files, and is executed when the page loads or in response to events.
This document provides an introduction to JavaScript including:
- JavaScript is the most popular programming language for adding interactivity to web pages.
- It is embedded directly into HTML and is case-sensitive.
- JavaScript can change HTML content, attributes, styles, validate data, and display pop-ups.
- The <script> tag is used to insert JavaScript into HTML. Scripts can go in the head or body.
- External JavaScript files allow code reuse across pages and improve performance.
- JavaScript outputs can be written to alerts, the page, elements, and the console.
- Variables, data types, operators, functions, conditional statements, loops, arrays and events are also introduced.
JavaScript is a scripting language that allows adding interactivity to HTML pages. It was originally developed by Netscape as a means to add dynamic content to web pages. JavaScript can be used to create client-side applications, enhance HTML pages with dynamic effects, validate forms, connect to databases, and more. Some key points about JavaScript include that it is embedded directly into HTML, interpreted rather than compiled, loosely typed, object-based, and event-driven. Common JavaScript objects include Window, Document, Location, Form, and more that correspond to HTML elements.
The document discusses client-side programming with JavaScript. It covers the differences between scripts and programs, and the common JavaScript scripting languages of JavaScript, JScript, and VBScript. It then discusses common scripting tasks like form validation, image rollovers, and handling cookies. The document also provides an overview of JavaScript data types, variables, operators, control statements, and functions for interactive pages using prompts.
JavaScript can change HTML content, attributes, styles, and validate data. It can be placed in the <body> and <head> sections between <script> tags. Functions and events allow JavaScript code to run when events occur. JavaScript can output to alerts, the document, elements, and the console. It uses data types like numbers, strings, Booleans, arrays, and objects. Conditionals like if/else and switch statements allow different code blocks to run based on conditions. Loops like for, for/in, while, and do/while repeat code.
This document discusses JavaScript scripting language. It provides examples of simple JavaScript programs to print text on a web page using methods like writeLn and alert. It also demonstrates how to prompt users for input and perform basic arithmetic operations on the input. Key concepts covered include variables, data types, operators, and conditional statements.
Learn the core fundamentals of JavaScript and how to use JavaScript creating web applications.
GET the Course - https://www.udemy.com/javascript-code-course/?couponCode=SLIDESHARE
Learn JavaScript Language Fundamentals and start coding JavaScript Today.
Source Code is included so you can try the code.
Resources and tips are provided throughout the course when appropriate.
Modern JavaScript focused means that we do cover current syntax as well as foundational code. No frameworks or JavaScript libraries you can do it all with regular vanilla JavaScript.
All you need is a browser to see JavaScript in action and with a few lines of code you can do a whole lot. It’s easy let us show you.
Course covers
Setup you working development environment and get ready to write some code.
What JavaScript is and how code works. Tools and resources used to write JavaScript
How to create JavaScript Code and run it in your browser
Comments and debugging with the console
Variables and how to create and store values in code
Declaring variables assigning values
Using let and const as variables
Strings Numbers and Boolean data types
Other data types null, undefined
Best practices and rules to name variables
Using JavaScript windows methods alert and prompt
Creating template literals
Challenge #1 Using Template literals in code
JavaScript type conversion and how it works
JavaScript Operators
Comparison and Assignment operators
Challenge #2 to create a Miles to Kilometers Converter
Truthy or Falsy
JavaScript Conditions if else statements
JavaScript Conditions else if statements
Using Short ternary operator
Conditions with Multiple conditions and logical operators
Challenge #3 - Hello Greeter
JavaScript Switch statement
JavaScript Functions
JavaScript Functions arguments and default values
JavaScript Functions return values
JavaScript click events on elements
Function declaration vs expression
Function scope global vs local
Function recursion
IIFE (Immediately Invoked Function Expression)
ES6 Arrow format
JavaScript Objects
Object Method and const
Functions to create Objects
JavaScript Arrays
Array methods to do more with arrays
Array filter
JavaScript Loops and iteration
forEach, object and array data
Challenge #4 - Loops Array builder
JavaScript Map
No libraries, no shortcuts just learning JavaScript making it DYNAMIC and INTERACTIVE web application.
Step by step learning with all steps included.
Beginner JavaScript knowledge is required as the course covers only JavaScript relevant to the building of the game. Also HTML and CSS knowledge is essential as scope of this course is all JavaScript focused.
Along with friendly support in the Q&A to help you learn and answer any questions you may have.
This document provides an overview of JavaScript, including:
- JavaScript is an interpreted programming language used to enhance websites through dynamic content and logic without page refreshes. It has no relation to Java.
- JavaScript can be added inline in HTML or through external files and is typically placed in the <head> section. It is case sensitive.
- Core JavaScript concepts covered include variables, arrays, conditional statements, loops, functions, objects, cookies, dates, math functions, and regular expressions.
- Asynchronous JavaScript and XML (AJAX) allows dynamic updating of web pages using the XMLHttpRequest object to communicate with servers in the background.
This document provides an overview of JavaScript 101. It discusses:
1. The roots of JavaScript including its development by Brendan Eich at Netscape in 1995 to add interactivity to web pages.
2. Core concepts of JavaScript including the DOM, objects, prototype-oriented programming, functions, timing events, scopes, and closures.
3. Advanced topics like callbacks, events, AJAX, performance factors, security considerations, and popular extension libraries.
The document provides examples of JavaScript code to illustrate key points and concepts. It aims to give readers foundational knowledge to understand the basics of JavaScript before exploring further advances.
The document discusses unobtrusive JavaScript and the UJS plugin for Rails. It describes separating JavaScript behavior from HTML content and CSS styling. The UJS plugin allows defining behaviors via CSS selectors and keeping scripts in external files. Examples are given of attaching remote behaviors to links and forms using the UJS plugin.
The document discusses different places where JavaScript code can be included in an HTML file, such as in the <head> or <body> sections, or externally in a .js file. It also covers JavaScript datatypes like numbers, strings, Booleans, and objects. Variables are declared with var and can have either global or local scope. Variable names follow naming conventions like not starting with numbers and avoiding reserved words.
This document provides information about cascading style sheets (CSS). It discusses the different ways to apply stylesheets, including inline, embedded, and external stylesheets. It explains that CSS controls the layout, fonts, colors and overall appearance of web pages. CSS allows separation of design from content and makes pages load faster. The document also covers CSS syntax, selectors, properties and values. Common CSS selectors for HTML elements like headings, paragraphs and horizontal rules are listed along with their properties.
This document provides an introduction to JavaScript. It discusses the purposes of JavaScript including making web pages interactive by manipulating pages or responding to user actions. It covers basic JavaScript syntax including variables, data types, operators, conditional statements, and functions. It also discusses event-driven programming in JavaScript and how to attach JavaScript functions to HTML elements as event handlers.
JavaScript was originally created as LiveScript in 1995 and renamed to JavaScript. It is an interpreted scripting language that can be added to HTML pages to provide dynamic interactivity. JavaScript code is executed by the browser's JavaScript engine and does not need to be compiled. It allows manipulating the structure, style, and content of HTML documents, validating form data, detecting browser capabilities, and much more.
MVC Frameworks for building PHP Web ApplicationsVforce Infotech
Hello and welcome to VForce Infotech Training on MVC Frameworks for Building PHP Web Applications. In this course we are going to look at PHP, and specifically we are going to look into some of the main frameworks that you can use to develop PHP applications. We are going to look at some of the patterns, most specifically the Model/View/ Controller pattern, which is at the root of every one of these frameworks. And then we are going to dive in and take a look at the Zend framework. We are going to also look at the SymFony framework. We will look at the lightweight CodeIgniter framework. And lastly will look at CakePHP. This course was designed to introduce you to some of the more popular PHP frameworks.
Hopefully you can choose what might be right for you and your project. I'll show you how to get started in each of them and you can take it from there. So let's get started.
This document outlines the modules and content covered in a JavaScript and ExtJS training course. Module 1 covers the basics of JavaScript, including elements of a JavaScript program, statements, functions, objects, arrays, and events. Module 2 provides an introduction to ExtJS and its fundamental classes. Module 3 continues ExtJS coverage, focusing on components, data stores, templates, and classes. Module 4 covers internationalization, drag and drop, common components like grids and trees, and application best practices in ExtJS. The objectives are to learn how to write JavaScript code using basic elements and create windows/dialog boxes, use built-in objects, handle events, manipulate forms, and integrate JavaScript with Java.
Risk assessments are a core requirement of modern Health and Safety legislation. Here is QBE's short guide to best practices in risk assesment, legal requirements in relation to this legislation and includes guidance and further information for employers.
The document provides an introduction to Active Server Pages (ASP) including what ASP is, how it differs from HTML, how to run ASP files, and basic ASP syntax rules. Some key points:
- ASP is a Microsoft technology that allows serverside scripting for dynamic web content. It uses scripts embedded in HTML files to interact with databases and run on IIS web servers.
- Unlike HTML, ASP files are executed by the web server before being returned to the browser. This allows ASP to dynamically generate content using scripts.
- ASP files use the .asp extension and can contain HTML, scripts, and code to access data and customize pages for users. Basic syntax involves response.write to output content.
JavaScript is the world's most popular programming language. It is used to add interactive effects to web pages. JavaScript code can be inserted into HTML pages between <script> tags. Common JavaScript statements include conditional statements like if/else and loops. Variables are used to store and manipulate data in JavaScript. Common data types include strings, numbers, booleans, arrays, and objects. Functions allow code reuse and organization. Operators are used to assign values, compare values, and perform arithmetic. jQuery is a popular JavaScript library that simplifies DOM manipulation and event handling.
JavaScript is a scripting language that allows dynamic interactivity on websites. It was invented by Brendan Eich to provide dynamic functionality to HTML documents. JavaScript can be used for simple tasks like image galleries and button clicks, as well as complex applications, games, and animations. JavaScript itself is compact but can be extended through APIs, frameworks, and libraries to unlock additional functionality with minimal effort.
This document provides an introduction to JavaScript, covering topics such as:
- The scope of the lesson includes an introduction to JavaScript, using JavaScript code, syntax, data types, objects, strings, functions, and standard popup boxes.
- JavaScript is a client-side scripting language that allows interactivity on web pages by modifying HTML content and handling events. It is interpreted by web browsers rather than compiled.
- JavaScript code can be embedded directly in HTML, or linked via external .js files, and is executed when the page loads or in response to events.
This document provides an introduction to JavaScript including:
- JavaScript is the most popular programming language for adding interactivity to web pages.
- It is embedded directly into HTML and is case-sensitive.
- JavaScript can change HTML content, attributes, styles, validate data, and display pop-ups.
- The <script> tag is used to insert JavaScript into HTML. Scripts can go in the head or body.
- External JavaScript files allow code reuse across pages and improve performance.
- JavaScript outputs can be written to alerts, the page, elements, and the console.
- Variables, data types, operators, functions, conditional statements, loops, arrays and events are also introduced.
JavaScript is a scripting language that allows adding interactivity to HTML pages. It was originally developed by Netscape as a means to add dynamic content to web pages. JavaScript can be used to create client-side applications, enhance HTML pages with dynamic effects, validate forms, connect to databases, and more. Some key points about JavaScript include that it is embedded directly into HTML, interpreted rather than compiled, loosely typed, object-based, and event-driven. Common JavaScript objects include Window, Document, Location, Form, and more that correspond to HTML elements.
The document discusses client-side programming with JavaScript. It covers the differences between scripts and programs, and the common JavaScript scripting languages of JavaScript, JScript, and VBScript. It then discusses common scripting tasks like form validation, image rollovers, and handling cookies. The document also provides an overview of JavaScript data types, variables, operators, control statements, and functions for interactive pages using prompts.
JavaScript can change HTML content, attributes, styles, and validate data. It can be placed in the <body> and <head> sections between <script> tags. Functions and events allow JavaScript code to run when events occur. JavaScript can output to alerts, the document, elements, and the console. It uses data types like numbers, strings, Booleans, arrays, and objects. Conditionals like if/else and switch statements allow different code blocks to run based on conditions. Loops like for, for/in, while, and do/while repeat code.
This document discusses JavaScript scripting language. It provides examples of simple JavaScript programs to print text on a web page using methods like writeLn and alert. It also demonstrates how to prompt users for input and perform basic arithmetic operations on the input. Key concepts covered include variables, data types, operators, and conditional statements.
Learn the core fundamentals of JavaScript and how to use JavaScript creating web applications.
GET the Course - https://www.udemy.com/javascript-code-course/?couponCode=SLIDESHARE
Learn JavaScript Language Fundamentals and start coding JavaScript Today.
Source Code is included so you can try the code.
Resources and tips are provided throughout the course when appropriate.
Modern JavaScript focused means that we do cover current syntax as well as foundational code. No frameworks or JavaScript libraries you can do it all with regular vanilla JavaScript.
All you need is a browser to see JavaScript in action and with a few lines of code you can do a whole lot. It’s easy let us show you.
Course covers
Setup you working development environment and get ready to write some code.
What JavaScript is and how code works. Tools and resources used to write JavaScript
How to create JavaScript Code and run it in your browser
Comments and debugging with the console
Variables and how to create and store values in code
Declaring variables assigning values
Using let and const as variables
Strings Numbers and Boolean data types
Other data types null, undefined
Best practices and rules to name variables
Using JavaScript windows methods alert and prompt
Creating template literals
Challenge #1 Using Template literals in code
JavaScript type conversion and how it works
JavaScript Operators
Comparison and Assignment operators
Challenge #2 to create a Miles to Kilometers Converter
Truthy or Falsy
JavaScript Conditions if else statements
JavaScript Conditions else if statements
Using Short ternary operator
Conditions with Multiple conditions and logical operators
Challenge #3 - Hello Greeter
JavaScript Switch statement
JavaScript Functions
JavaScript Functions arguments and default values
JavaScript Functions return values
JavaScript click events on elements
Function declaration vs expression
Function scope global vs local
Function recursion
IIFE (Immediately Invoked Function Expression)
ES6 Arrow format
JavaScript Objects
Object Method and const
Functions to create Objects
JavaScript Arrays
Array methods to do more with arrays
Array filter
JavaScript Loops and iteration
forEach, object and array data
Challenge #4 - Loops Array builder
JavaScript Map
No libraries, no shortcuts just learning JavaScript making it DYNAMIC and INTERACTIVE web application.
Step by step learning with all steps included.
Beginner JavaScript knowledge is required as the course covers only JavaScript relevant to the building of the game. Also HTML and CSS knowledge is essential as scope of this course is all JavaScript focused.
Along with friendly support in the Q&A to help you learn and answer any questions you may have.
This document provides an overview of JavaScript, including:
- JavaScript is an interpreted programming language used to enhance websites through dynamic content and logic without page refreshes. It has no relation to Java.
- JavaScript can be added inline in HTML or through external files and is typically placed in the <head> section. It is case sensitive.
- Core JavaScript concepts covered include variables, arrays, conditional statements, loops, functions, objects, cookies, dates, math functions, and regular expressions.
- Asynchronous JavaScript and XML (AJAX) allows dynamic updating of web pages using the XMLHttpRequest object to communicate with servers in the background.
This document provides an overview of JavaScript 101. It discusses:
1. The roots of JavaScript including its development by Brendan Eich at Netscape in 1995 to add interactivity to web pages.
2. Core concepts of JavaScript including the DOM, objects, prototype-oriented programming, functions, timing events, scopes, and closures.
3. Advanced topics like callbacks, events, AJAX, performance factors, security considerations, and popular extension libraries.
The document provides examples of JavaScript code to illustrate key points and concepts. It aims to give readers foundational knowledge to understand the basics of JavaScript before exploring further advances.
The document discusses unobtrusive JavaScript and the UJS plugin for Rails. It describes separating JavaScript behavior from HTML content and CSS styling. The UJS plugin allows defining behaviors via CSS selectors and keeping scripts in external files. Examples are given of attaching remote behaviors to links and forms using the UJS plugin.
The document discusses different places where JavaScript code can be included in an HTML file, such as in the <head> or <body> sections, or externally in a .js file. It also covers JavaScript datatypes like numbers, strings, Booleans, and objects. Variables are declared with var and can have either global or local scope. Variable names follow naming conventions like not starting with numbers and avoiding reserved words.
This document provides information about cascading style sheets (CSS). It discusses the different ways to apply stylesheets, including inline, embedded, and external stylesheets. It explains that CSS controls the layout, fonts, colors and overall appearance of web pages. CSS allows separation of design from content and makes pages load faster. The document also covers CSS syntax, selectors, properties and values. Common CSS selectors for HTML elements like headings, paragraphs and horizontal rules are listed along with their properties.
This document provides an introduction to JavaScript. It discusses the purposes of JavaScript including making web pages interactive by manipulating pages or responding to user actions. It covers basic JavaScript syntax including variables, data types, operators, conditional statements, and functions. It also discusses event-driven programming in JavaScript and how to attach JavaScript functions to HTML elements as event handlers.
JavaScript was originally created as LiveScript in 1995 and renamed to JavaScript. It is an interpreted scripting language that can be added to HTML pages to provide dynamic interactivity. JavaScript code is executed by the browser's JavaScript engine and does not need to be compiled. It allows manipulating the structure, style, and content of HTML documents, validating form data, detecting browser capabilities, and much more.
MVC Frameworks for building PHP Web ApplicationsVforce Infotech
Hello and welcome to VForce Infotech Training on MVC Frameworks for Building PHP Web Applications. In this course we are going to look at PHP, and specifically we are going to look into some of the main frameworks that you can use to develop PHP applications. We are going to look at some of the patterns, most specifically the Model/View/ Controller pattern, which is at the root of every one of these frameworks. And then we are going to dive in and take a look at the Zend framework. We are going to also look at the SymFony framework. We will look at the lightweight CodeIgniter framework. And lastly will look at CakePHP. This course was designed to introduce you to some of the more popular PHP frameworks.
Hopefully you can choose what might be right for you and your project. I'll show you how to get started in each of them and you can take it from there. So let's get started.
This document outlines the modules and content covered in a JavaScript and ExtJS training course. Module 1 covers the basics of JavaScript, including elements of a JavaScript program, statements, functions, objects, arrays, and events. Module 2 provides an introduction to ExtJS and its fundamental classes. Module 3 continues ExtJS coverage, focusing on components, data stores, templates, and classes. Module 4 covers internationalization, drag and drop, common components like grids and trees, and application best practices in ExtJS. The objectives are to learn how to write JavaScript code using basic elements and create windows/dialog boxes, use built-in objects, handle events, manipulate forms, and integrate JavaScript with Java.
Risk assessments are a core requirement of modern Health and Safety legislation. Here is QBE's short guide to best practices in risk assesment, legal requirements in relation to this legislation and includes guidance and further information for employers.
The document provides an introduction to Active Server Pages (ASP) including what ASP is, how it differs from HTML, how to run ASP files, and basic ASP syntax rules. Some key points:
- ASP is a Microsoft technology that allows serverside scripting for dynamic web content. It uses scripts embedded in HTML files to interact with databases and run on IIS web servers.
- Unlike HTML, ASP files are executed by the web server before being returned to the browser. This allows ASP to dynamically generate content using scripts.
- ASP files use the .asp extension and can contain HTML, scripts, and code to access data and customize pages for users. Basic syntax involves response.write to output content.
Metody poszukiwania pracy ANNA PASŁAWSKA-MIODUSZEWSKAWolny Przemysław
Skuteczne sposoby na znalezienie wymarzonej pracy.
Zresztą sam zobacz, o czym się dowiesz z tego poradnika:
Siedem najskuteczniejszych sposobów na zlezienie pierwszej pracy lub zmienienie dotychczasowej. Jeśli szukałeś, ale nie znalazłeś, to wypróbuj teraz te metody. O wielu z nich, być może nawet nigdy nie pomyślałeś.
Jak zmotywować się do zmiany pracy i uwierzyć że się uda? Szukanie pracy może nie przynieść żadnych rezultatów, jeśli nie zmotywujesz się do tego odpowiedniego.
12 praktycznych ćwiczeń, które pomogą Ci znaleźć pracę. Zrób je wszystkie, aby przygotować się na zdobycie nowej pracy.
Jak stworzyć profesjonalne CV i List motywacyjny? Sprawdzony poradnik oraz wzory gotowców, które możesz wykorzystać. Wystarczy tylko pozmieniać dane i odpowiednio zmodyfikować całość.
Jak przygotować się do rozmowy kwalifikacyjnej?
- o czym pamiętać podczas rozmowy,
- co powinieneś wiedzieć idąc na rozmowę,
- jak się przygotowywać,
- czego na pewno się spodziewać.
Co zrobić kiedy nie wiesz jaką pracę chcesz podjąć i co robić w życiu? Jeśli stoisz przed takim dylematem (podobnie jak wielu innych ludzi) to powinieneś...
Jak przygotować się do zmiany pracy?
- finansowo,
- psychicznie,
- towarzysko.
Adresy stron internetowych, na których możesz skutecznie szukać pracy.
Gdzie zwrócić się o pomoc przy poszukiwaniu pracy? Być może tego nie wiesz, ale istnieje szereg instytucji, które mogą Ci skutecznie pomóc (mają kontakty i odpowiednią wiedzę).
Este documento describe los componentes básicos de un sistema y cómo funcionan. Un sistema está compuesto de tres partes principales: las entradas (recursos), el proceso (actividades de transformación), y las salidas (resultados). También incluye un mecanismo de retroalimentación para comparar los resultados con los objetivos y mejorar el desempeño del sistema. Finalmente, explica que un sistema puede dividirse en subsistemas y debe ser administrado para mantener un estado de equilibrio.
El documento presenta información sobre cinco profesores de educación física, incluyendo sus nombres, fechas de nacimiento, educación, experiencia laboral y lugares de trabajo actuales o pasados. Proporciona detalles sobre sus títulos, especializaciones y cargos ocupados en instituciones educativas y deportivas.
This curriculum unit explores identity and family migration stories for Latino youth through art and literature. Students will analyze works by Romare Bearden, Jacob Lawrence, Joseph Rodriguez and Judith Baca to draw connections between the African American experience and their own families' stories. They will learn about their personal family's migration path and how it relates to achieving the American Dream. As a final project, students will create their own art and tell their family's story through a digital presentation, reflecting on how elements like language, race and class impacted their family's journey. The goal is for students to develop a strong sense of identity and appreciate other cultural experiences through sharing their unique stories.
This document provides an introduction to XML Schema, including:
- XML Schema defines the structure and legal elements of an XML document, similar to a DTD.
- XML Schema supports data types, which makes validating data easier.
- XML Schemas are written in XML syntax, allowing them to be edited, parsed, and manipulated using XML tools.
- XML Schemas help secure data communication by ensuring mutual understanding of data formats.
- XML Schemas are extensible and can reference other schemas.
- Examples are provided of a simple XML document and its corresponding XML Schema.
Este documento fornece informações sobre gerenciadores de boot (carregadores de inicialização) como LILO e GRUB. Ele discute o que são gerenciadores de boot, como instalá-los e configurá-los, e como lidar com mensagens de erro. O documento também aborda personalização de boot loaders.
This document provides an introduction to analyzing video games. It discusses the key components of video game analysis including narratology, which examines the narrative, and ludology, which examines the gameplay and rules. It outlines different levels of narratological and ludological analysis from basic to more complex approaches. It also discusses combining and relating the two areas of analysis. The document recommends specific video games to play and analyze and provides resources for obtaining games.
JavaScript is the primary scripting language of the web and is used to make web pages interactive. It can dynamically write and modify HTML content, react to user events like clicks, validate form data, detect the browser, and more. JavaScript code is commonly embedded directly in HTML using <script> tags and can also be stored externally in .js files. Key JavaScript concepts include variables, operators, conditional statements, functions, loops, and events.
This document provides an overview of JavaScript, including what JavaScript is, how it is used, and some key JavaScript concepts. It defines JavaScript as the scripting language of the web that is used to add interactivity and functionality to HTML pages. The document outlines JavaScript statements, variables, operators, events, and error handling. It also discusses how JavaScript can interact with HTML elements, validate forms, detect the browser, and use cookies. The last few sections cover the navigator object and how JavaScript can retrieve information about the user's browser.
JavaScript is a scripting language that allows adding interactivity to HTML pages. It can be used for client-side form validation and integration with user plugins. JavaScript is case-sensitive and allows variables, functions, conditional statements, and objects. Common uses include pop-up boxes, event handling, and cookies.
This document provides an overview of JavaScript concepts and features. It introduces JavaScript, its uses, basic syntax like variables, operators, and popup boxes. It also covers conditional statements, loops, functions, arrays, objects like Date and Math objects, regular expressions, and cookies. The document is intended as an introduction to JavaScript for learning its basic concepts.
JavaScript was originally named Mocha but was renamed LiveScript and then JavaScript. It is a lightweight, interpreted programming language designed for creating network-centric and browser-based applications. JavaScript can be used for client-side scripting through features like popup boxes and event handling, and for server-side scripting by running JavaScript code on the server with Node.js. It includes basic datatypes, operators, control flows, and built-in objects for manipulating the browser and its DOM.
JavaScript is a programming language used to make web pages interactive. It can be placed in the <body> and <head> sections of an HTML page. JavaScript code must be inserted between <script> and </script> tags. Functions and events allow JavaScript code to run when events occur, like when a user clicks a button. Scripts can also be placed in external .js files for reuse across pages. JavaScript can output data through alerts, writing to the HTML, or the browser console. Variables are used to store and work with data in JavaScript programs. Comments are used to explain code and prevent execution when needed.
The document discusses JavaScript topics that will be covered in a web technology course. It outlines 10 lectures covering JavaScript introduction, variables, operators, conditional and loop statements, functions, event handling, objects, cookies, forms validation, AJAX, and VBScript. The first lecture defines JavaScript, what it can do, and provides simple examples of JavaScript code embedded in HTML and using external JavaScript files. It also covers variable declaration, local and global variables.
This document discusses JavaScript as a scripting language that allows for dynamic web pages. It covers running JavaScript code using <script> tags, working with variables and data types, operators and expressions, conditional statements like if/else and switch, and loops. Key points include JavaScript being interpreted rather than compiled, adding JavaScript via embedded, inline, or external code, and using variables, comments, arithmetic, comparison, assignment and logical operators.
JavaScript can be used for client-side scripting to add interactivity to web pages. The client-side environment where JavaScript runs is usually a web browser. JavaScript code is transferred from the web server to the user's computer and run directly in the browser. Common uses of JavaScript include adding multimedia elements to pages, creating pages dynamically based on user input, and allowing interaction through events like clicking buttons.
JavaScript is a scripting language that can be used to make web pages interactive. It allows you to check and modify HTML forms, change images, and write dynamic content. JavaScript code is executed by the browser and only affects the current page. The language is case sensitive, lightweight, and interpreted rather than compiled. Variables, literals, objects, operators, control structures, and functions are the basic components of JavaScript code. Comments can be added to explain code. JavaScript code can be embedded directly in HTML pages or linked via external .js files. Code placement in the head or body affects when it runs.
The document provides an overview of key topics in JavaScript including:
- Introduction to client-side scripting and how JavaScript is used
- JavaScript types like numbers, strings, objects
- Variables, operators, and conditional statements in JavaScript
- Loops, popup boxes, events, arrays, functions and how to use JavaScript in forms and validation
It serves as a syllabus or outline for learning JavaScript fundamentals and applications.
JavaScript was designed to add interactivity to HTML pages. It is a scripting language that is usually embedded directly into HTML pages and allows programmers to put dynamic text and react to events. JavaScript can be used to validate data, detect the visitor's browser, create cookies, and read and write HTML elements. It uses semicolons, handles old browser versions, is case sensitive, and ignores whitespace. Variables can be local or global and datatypes include empty, null, boolean, char, integer, long, float, double, date, string, and object. JavaScript supports operators, conditional statements, looping statements, and functions.
The document provides an introduction to JavaScript, covering topics like what JavaScript is, where scripts can be placed, syntax and rules, blocks, comments, and variables. It includes examples of JavaScript code and assignments for students to practice basic JavaScript concepts like writing to the document, using blocks, comments, and variables.
web programming concepts is Overview of Java Script
A number of Technologies are present that develops the static web page, but we require a language that is dynamic in nature to develop web pages.
JavaScript was created by Brendan Eich in 1995 at Netscape Communications.
JavaScript was the first client-side scripting language developed by Netscape.
JavaScript made its first appearance in Netscape 2.0 in 1995 with the name LiveScript.
Overview of Java Script
A number of Technologies are present that develops the static web page, but we require a language that is dynamic in nature to develop web pages.
JavaScript was created by Brendan Eich in 1995 at Netscape Communications.
JavaScript was the first client-side scripting language developed by Netscape.
JavaScript made its first appearance in Netscape 2.0 in 1995 with the name LiveScript.
JavaScript is an object-based client-side scripting language that is popular and used to create dynamic and interactive web pages.
Javascript is an interpreted language usually used with HTML, and programs written in JavaScript are called lightweight scripts.
JavaScript is a simple language which is only suitable for simple tasks.
JavaScript is an object-based client-side scripting language that is popular and used to create dynamic and interactive web pages.
Javascript is an interpreted language usually used with HTML, and programs written in JavaScript are called lightweight scripts.
JavaScript is a simple language which is only suitable for simple tasks.
JavaScript is an object-based client-side scripting language that is popular and used to create dynamic and interactive web pages.
Javascript is an interpreted language usually used with HTML, and programs written in JavaScript are called lightweight scripts.
JavaScript is a simple language which is only suitable for simple tasks.
JavaScript is an object-based client-side scripting language that is popular and used to create dynamic and interactive web pages.
Javascript is an interpreted language usually used with HTML, and programs written in JavaScript are called lightweight scripts.
JavaScript is a simple language which is only suitable for simple tasks.
JavaScript is an object-based client-side scripting language that is popular and used to create dynamic and interactive web pages.
Javascript is an interpreted language usually used with HTML, and programs written in JavaScript are called lightweight scripts.
JavaScript is a simple language which is only suitable for simple tasks.
JavaScript is an object-based client-side scripting language that is popular and used to create dynamic and interactive web pages.
Javascript is an interpreted language usually used with HTML, and programs written in JavaScript are called lightweight scripts.
JavaScript is a simple language which is only suitable for simple tasks.
JavaScript is an object-based client-side scripting language that is popular and used to create dynamic and interactive web pa
JavaScript is a scripting language that can be inserted into HTML pages and used to program the behavior of web pages. It allows web pages to be dynamic and interactive. JavaScript code is placed between <script> and </script> tags and can manipulate HTML elements and write to the document. Variables, functions, conditional statements, and operators allow JavaScript code to run conditionally based on events or user input. JavaScript is case sensitive, uses semicolons, and has both local and global variables. Common data types include numbers, strings, arrays, and objects.
The document provides information about JavaScript including:
- JavaScript is a scripting language that adds interactivity to HTML pages and is used for client-side scripting.
- It can dynamically update HTML content, react to user events, validate form data, and detect the visitor's browser.
- JavaScript code can be embedded directly in HTML pages or placed in external .js files and included using script tags.
- The document discusses JavaScript variables, data types, operators, functions, and common uses of JavaScript in web pages.
The document provides an overview of HTML (Hypertext Markup Language) including:
- HTML was created by Tim Berners-Lee in 1991 and defines the structure and layout of web pages through a variety of tags.
- Common HTML tags are used to define headings, paragraphs, lines, and attributes that provide additional information about elements.
- The basic structure of an HTML document includes tags such as <html>, <head>, <body>, which contain other tags for formatting text, images, and other content.
This document discusses HTML frames and inline frames (iframes). Frames divide the browser window into separate panes, each containing an HTML document. Key advantages of frames include reloading single panes without reloading the entire window. A collection of frames is called a frameset. The document defines how to create framesets using the <frameset> element and <frame> elements to specify individual frames. Attributes of these elements control frame borders, sizes, and content. <iframes> embed separate documents within the main document.
Forms are used to collect data from users on a website. A form contains input elements like text fields, checkboxes, and select menus. When submitted, the form sends the user-entered data to a backend script for processing. Common form attributes include name, action, and method. Different input types like text, password, radio buttons, and file uploads are used to collect different data from users.
This document discusses HTML images, tables, and lists. For images, the <img> tag is used which contains attributes like src, alt, width and height. Tables are created with <table>, <tr>, and <td> tags. They can have borders, headers, rowspans and colspans. Unordered lists use the <ul> tag and list items <li>. Ordered lists use the <ol> tag. Definition lists have terms defined with <dt> and definitions with <dd>.
This document provides an overview of common HTML tags used for text formatting, links, and adding metadata to web pages. It describes tags such as <p>, <b>, <a>, <title>, <style>, <script>, <link>, and <meta> and provides examples of how to use each tag. It also explains how links are defined and styled in HTML and how images can be used as links. The document is intended as a tutorial on basic HTML tags and their usage.
CSS is a style sheet language used to describe the presentation of web pages including colors, fonts, layout, etc. It allows separation of document content from document presentation for better content organization and maintenance. CSS rules are made up of selectors, properties, and values and can be defined within HTML, externally, or via internal stylesheets. Common CSS properties include font, color, background, text, box model, list, table, and positioning. CSS specifications are developed and maintained by the W3C to standardize web development.
This document provides an overview of various CSS properties for controlling colors, backgrounds, fonts, text formatting, links, positioning elements, and more. It describes properties like color, background-color, font-family, text-align, border, float, position and others. The document is intended as a tutorial or guide for using CSS to style and lay out web pages.
The document provides an introduction to XML, explaining that it stands for Extensible Markup Language and is used to carry data rather than display it. XML tags are user-defined rather than predefined. It also discusses how XML separates data from HTML/display, and simplifies data transport between systems. Key aspects of XML like elements, attributes, and being well-formed are summarized.
This document discusses Document Type Definitions (DTDs) which define the legal building blocks of an XML document including elements and attributes. It explains that a DTD can be declared inline or externally. The key purposes of a DTD are to allow data interchange between groups using a standard definition, and to validate received and internal data. The document defines XML building blocks like PCDATA and CDATA, and how to declare elements as empty, containing parsed character data, having any contents, or containing child elements with defined occurrences. It also distinguishes between internal and external DTD declarations.
The document discusses XML DOM and SAX. XML DOM defines a standard for accessing and manipulating XML documents and is a W3C standard. The XML DOM defines the objects and properties of all XML elements and methods to access them. SAX is an event-based parser API that provides an alternative to DOM for reading XML documents sequentially. SAX parsers have lower memory requirements than DOM parsers but validation requires access to the full document, which SAX does not provide.
The document discusses web technology and client-server computing. It provides an overview of the history and development of the World Wide Web from its creation by Tim Berners-Lee in 1989. It describes common web protocols like HTTP, TCP/IP, FTP, and SMTP. It also discusses strategies for web development projects and how to connect devices to the internet. Finally, it outlines the basic roles and interactions in a client-server computing model.
The document discusses various aspects of web development including:
1. It compares traditional projects to web projects, noting differences in roles, pricing models, and standards.
2. It defines objects in web development as visible components in the web browser like text boxes and buttons.
3. It outlines the typical steps in a web development strategy including goals, design, prototyping, testing, and launch.
The document discusses various aspects of web development including:
1. It compares traditional projects to web projects, noting differences in roles, pricing models, and standards.
2. It defines objects in web development as visible components in the browser like text boxes and buttons.
3. It outlines the typical steps in a web development strategy including goals, design, prototyping, testing, and launch.
This document provides an introduction to web technology. It discusses the history of the World Wide Web and protocols like HTTP, TCP/IP, FTP, and SMTP. It defines websites and the differences between corporate and individual websites. The document also covers cyber laws, web applications, and the process of writing web projects including identifying objectives, target users, scope, budget, and planning issues.
This document outlines the study and evaluation scheme for a Master of Technology degree in Computer Science/Information Technology at UPTU.
It provides the course codes, subjects, theory/tutorial/lab periods, and evaluation schemes for each semester. In semester 1, there are 4 core courses covering foundations of computer science, computer organization/architecture, operating systems, and data networks. Each has theory, tutorial, and lab components, with internal assessments worth 30-50 marks and end semester exams worth 100-150 marks.
Semester 2 covers 4 elective courses, with similar evaluation schemes. Semesters 3 and 4 include electives, a professional aspects course, seminar, and dissertation work. Evaluation includes internal and
WiMAX has the potential to replace existing telecommunications infrastructure by providing broadband internet, phone, and TV services without the need for cables. It can offer these services to both fixed locations and mobile users. WiMAX works by transmitting data between base stations and customer equipment over the air. The key components are radios at the base stations and customer locations, along with antennas to transmit and receive the wireless signals. WiMAX provides faster speeds and wider coverage than existing wireless technologies like WiFi, and allows for converged voice, data, and video services.
Virtual LANs (VLANs) segment networks logically by assigning ports on a switch to different broadcast domains. This allows broadcast traffic to be contained to specific VLANs rather than flooding the entire network. VLANs can be defined by port, MAC address, IP subnet, or multicast group. Quality of Service can also be implemented using VLAN tags to prioritize certain types of traffic. VLANs provide security and segregation benefits by creating logical boundaries between network segments. They allow networks to scale efficiently while containing broadcast traffic and prioritizing important applications.
This document discusses Local Area Networks (LANs) and Virtual Local Area Networks (VLANs). It defines VLANs as a way to logically segment a LAN into separate broadcast domains even if devices are not physically close together. The document outlines several advantages of VLANs such as improved performance, easier administration of virtual workgroups, reduced costs, and increased security. It also describes how VLANs work by tagging frames with VLAN identifiers and using filtering databases to direct traffic to the appropriate VLANs.
This document summarizes key aspects of TCP traffic control as covered in Chapter 12. It discusses TCP flow and congestion control, including how the transmission rate is determined by incoming ACKs. It then covers traffic control fields in the TCP header, credit allocation mechanisms, and the impact of window size on throughput. The document also summarizes TCP congestion control techniques like slow start, congestion avoidance, fast retransmit, fast recovery, and limited transmit. It notes the differentiating impact of "mice vs. elephant" flows on network congestion.
This document discusses packet scheduling techniques for quality of service (QoS) management in computer networks. It covers max-min weighted fair share scheduling, which assigns weights to flows based on their different QoS requirements. It also discusses fair queuing, processor sharing, generalized processor sharing (GPS), weighted fair queuing (WFQ), and deficit round robin (DRR) scheduling algorithms. GPS provides exact max-min weighted fair share but is an ideal model, while WFQ and DRR are practical implementations that approximate GPS to provide service differentiation and bounded delays. Scheduling algorithms have a "schedulable region" defining all performance bounds they can simultaneously meet for admission control.
1. Web Technology ECS-604
Lecture No. 13
JavaScript
JavaScript is the most popular scripting language on the internet, and works in all major
browsers, such as Internet Explorer, Firefox, Chrome, Opera, and Safari.
What is JavaScript?
JavaScript was designed to add interactivity to HTML pages
JavaScript is a scripting language
A scripting language is a lightweight programming language
JavaScript is usually embedded directly into HTML pages
JavaScript is an interpreted language (means that scripts execute without preliminary compilation)
Everyone can use JavaScript without purchasing a license
What can a JavaScript do?
JavaScript gives HTML designers a programming tool - HTML authors are normally not
programmers, but JavaScript is a scripting language with a very simple syntax! Almost anyone can
put small "snippets" of code into their HTML pages
JavaScript can put dynamic text into an HTML page - A JavaScript statement like this:
document.write("<h1>" + name + "</h1>") can write a variable text into an HTML page
JavaScript can react to events - A JavaScript can be set to execute when something happens,
like when a page has finished loading or when a user clicks on an HTML element
JavaScript can read and write HTML elements - A JavaScript can read and change the content
of an HTML element
JavaScript can be used to validate data - A JavaScript can be used to validate form data before
it is submitted to a server. This saves the server from extra processing
JavaScript can be used to detect the visitor's browser - A JavaScript can be used to detect the
visitor's browser, and - depending on the browser - load another page specifically designed for that
browser
JavaScript can be used to create cookies - A JavaScript can be used to store and retrieve
information on the visitor's computer
Put a JavaScript into an HTML page
The example below shows how to use JavaScript to write text on a web page:
Example
<html>
<body>
<script type="text/javascript">
document.write("Hello World!");
</script>
</body>
</html>
JavaScript Where To
2. Web Technology ECS-604
JavaScripts can be put in the body and in the head sections of an HTML page.
Where to Put the JavaScript
JavaScripts in a page will be executed immediately while the page loads into the browser. This is not always
what we want. Sometimes we want to execute a script when a page loads, or at a later event, such as when
a user clicks a button. When this is the case we put the script inside a function, you will learn about
functions in a later chapter.
Scripts in <head>
Scripts to be executed when they are called, or when an event is triggered, are placed in functions.
Put your functions in the head section, this way they are all in one place, and they do not interfere with
page content.
Scripts in <body>
If you don't want your script to be placed inside a function, or if your script should write page content, it
should be placed in the body section.
Example
<html>
<head>
</head>
<body>
<script type="text/javascript">
document.write("This message is written by JavaScript");
</script>
</body>
</html>
Try it yourself »
Scripts in <head> and <body>
You can place an unlimited number of scripts in your document, so you can have scripts in both the body
and the head section.
Example
<html>
<head>
<script type="text/javascript">
function message()
{
alert("This alert box was called with the onload event");
}
</script>
</head>
3. Web Technology ECS-604
<body onload="message()">
<script type="text/javascript">
document.write("This message is written by JavaScript");
</script>
</body>
</html>
Using an External JavaScript
If you want to run the same JavaScript on several pages, without having to write the same script on every
page, you can write a JavaScript in an external file.
Save the external JavaScript file with a .js file extension.
Note: The external script cannot contain the <script></script> tags!
To use the external script, point to the .js file in the "src" attribute of the <script> tag:
Example
<html>
<head>
<script type="text/javascript" src="xxx.js"></script>
</head>
<body>
</body>
</html>
»
Note: Remember to place the script exactly where you normally would write the script!
JavaScript Variables
Variables are "containers" for storing information.
JavaScript Variables
As with algebra, JavaScript variables are used to hold values or expressions.
A variable can have a short name, like x, or a more descriptive name, like carname.
Rules for JavaScript variable names:
Variable names are case sensitive (y and Y are two different variables)
Variable names must begin with a letter or the underscore character
A variable's value can change during the execution of a script. You can refer to a variable by its name to
display or change its value.
4. Web Technology ECS-604
Declaring (Creating) JavaScript Variables
Creating variables in JavaScript is most often referred to as "declaring" variables.
You can declare JavaScript variables with the var statement:
var x;
var carname;
After the declaration shown above, the variables are empty (they have no values yet).
Assigning Values to Undeclared JavaScript Variables
If you assign values to variables that have not yet been declared, the variables will automatically be
declared.
Redeclaring JavaScript Variables
If you redeclare a JavaScript variable, it will not lose its original value.
var x=5;
var x;
After the execution of the statements above, the variable x will still have the value of 5. The value of x is not
reset (or cleared) when you redeclare it.
JavaScript Arithmetic
As with algebra, you can do arithmetic operations with JavaScript variables:
y=x-5;
z=y+5;
JavaScript Operators
The assignment operator = is used to assign values to JavaScript variables.
The arithmetic operator + is used to add values together.
y=5;
z=2;
x=y+z;
JavaScript Arithmetic Operators
Arithmetic operators are used to perform arithmetic between variables and/or values.
Given that y=5, the table below explains the arithmetic operators:
5. Web Technology ECS-604
Operator Description Example Result
+ Addition x=y+2 x=7
- Subtraction x=y-2 x=3
* Multiplication x=y*2 x=10
/ Division x=y/2 x=2.5
% Modulus (division remainder) x=y%2 x=1
++ Increment x=++y x=6
-- Decrement x=--y x=4
Operator Example Same As Result
= x=y x=5
+= x+=y x=x+y x=15
-= x-=y x=x-y x=5
*= x*=y x=x*y x=50
/= x/=y x=x/y x=2
%= x%=y x=x%y x=0
JavaScript Comparison and Logical Operators
Comparison and Logical operators are used to test for true or false.
Comparison Operators
Comparison operators are used in logical statements to determine equality or difference between variables
or values.
Given that x=5, the table below explains the comparison operators:
Operator Description Example
== is equal to x==8 is false
=== is exactly equal to (value and type) x===5 is true
x==="5" is false
!= is not equal x!=8 is true
> is greater than x>8 is false
< is less than x<8 is true
>= is greater than or equal to x>=8 is false
<= is less than or equal to x<=8 is true
6. Web Technology ECS-604
Logical Operators
Logical operators are used to determine the logic between variables or values.
Given that x=6 and y=3, the table below explains the logical operators:
Operator Description Example
&& and (x < 10 && y > 1) is true
|| or (x==5 || y==5) is false
! not !(x==y) is true
Conditional Statements
Very often when you write code, you want to perform different actions for different
decisions. You can use conditional statements in your code to do this.
In JavaScript we have the following conditional statements:
if statement - use this statement to execute some code only if a specified condition is true
if...else statement - use this statement to execute some code if the condition is true and
another code if the condition is false
if...else if....else statement - use this statement to select one of many blocks of code to be
executed
switch statement - use this statement to select one of many blocks of code to be executed
JavaScript Switch Statement
Conditional statements are used to perform different actions
based on different conditions.
The JavaScript Switch Statement
Use the switch statement to select one of many blocks of code to be executed.
This is how it works: First we have a single expression n (most often a variable), that is
evaluated once. The value of the expression is then compared with the values for each case
in the structure. If there is a match, the block of code associated with that case is executed.
Use break to prevent the code from running into the next case automatically.
Example
<script type="text/javascript">
//You will receive a different greeting based
7. Web Technology ECS-604
//on what day it is. Note that Sunday=0,
//Monday=1, Tuesday=2, etc.
var d=new Date();
theDay=d.getDay();
switch (theDay)
{
case 5:
document.write("Finally Friday");
break;
default:
document.write("I'm looking forward to this weekend!");
}
</script>
Lecture No. 14
Objects in JavaScript
JavaScript Popup Boxes
JavaScript has three kind of popup boxes: Alert box, Confirm box, and Prompt box.
Alert Box
An alert box is often used if you want to make sure information comes
through to the user.
When an alert box pops up, the user will have to click "OK" to proceed.
Syntax
alert("sometext");
Example
<html>
<head>
<script type="text/javascript">
function show_alert()
{
alert("I am an alert box!");
8. Web Technology ECS-604
}
</script>
</head>
<body>
<input type="button" onclick="show_alert()" value="Show alert box" />
</body>
</html>
Confirm Box
A confirm box is often used if you want the user to verify or accept something.
When a confirm box pops up, the user will have to click either "OK" or "Cancel" to proceed.
If the user clicks "OK", the box returns true. If the user clicks "Cancel", the box returns false.
Syntax
confirm("sometext");
Prompt Box
A prompt box is often used if you want the user to input a value before
entering a page.
When a prompt box pops up, the user will have to click either "OK" or "Cancel" to proceed
after entering an input value.
If the user clicks "OK" the box returns the input value. If the user clicks "Cancel" the box
returns null.
Syntax
prompt("sometext","defaultvalue");
Example
<html>
<head>
<script type="text/javascript">
function show_prompt()
{
var name=prompt("Please enter your name","Harry Potter");
if (name!=null && name!="")
{
document.write("Hello " + name + "! How are you today?");
}
}
</script>
9. Web Technology ECS-604
</head>
<body>
<input type="button" onclick="show_prompt()" value="Show prompt box" />
</body>
</html>
JavaScript Functions
A function will be executed by an event or by a call to the function.
JavaScript Functions
To keep the browser from executing a script when the page loads, you can put your script
into a function.
A function contains code that will be executed by an event or by a call to the function.
You may call a function from anywhere within a page (or even from other pages if the
function is embedded in an external .js file).
Functions can be defined both in the <head> and in the <body> section of a document.
However, to assure that a function is read/loaded by the browser before it is called, it could
be wise to put functions in the <head> section.
How to Define a Function
Syntax
function functionname(var1,var2,...,varX)
{
some code
}
Example
<html>
<head>
<script type="text/javascript">
function displaymessage()
{
alert("Hello World!");
}
</script>
</head>
10. Web Technology ECS-604
<body>
<form>
<input type="button" value="Click me!" onclick="displaymessage()" />
</form>
</body>
</html>
Example
<html>
<head>
<script type="text/javascript">
function product(a,b)
{
return a*b;
}
</script>
</head>
<body>
<script type="text/javascript">
document.write(product(4,3));
</script>
</body>
</html>
The do...while Loop
The do...while loop is a variant of the while loop. This loop will execute the block of code
ONCE, and then it will repeat the loop as long as the specified condition is true.
Syntax
do
{
code to be executed
}
while (var<=endvalue);
11. Web Technology ECS-604
The example below uses a do...while loop. The do...while loop will always be executed at
least once, even if the condition is false, because the statements are executed before the
condition is tested:
Example
<html>
<body>
<script type="text/javascript">
var i=0;
do
{
document.write("The number is " + i);
document.write("<br />");
i++;
}
while (i<=5);
</script>
</body>
</html>
JavaScript Break and Continue Statements
The break Statement
The break statement will break the loop and continue executing the code that follows after
the loop (if any).
Example
<html>
<body>
<script type="text/javascript">
var i=0;
for (i=0;i<=10;i++)
{
if (i==3)
{
break;
}
document.write("The number is " + i);
12. Web Technology ECS-604
document.write("<br />");
}
</script>
</body>
</html>
The continue Statement
The continue statement will break the current loop and continue with the next
value.
Example
<html>
<body>
<script type="text/javascript">
var i=0
for (i=0;i<=10;i++)
{
if (i==3)
{
continue;
}
document.write("The number is " + i);
document.write("<br />");
}
</script>
</body>
</html>