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An idea of how to make JavaScript testable, presented at Stir Trek 2011. The world of JavaScript frameworks has changed greatly since then, but I still agree with the concepts.
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An idea of how to make JavaScript testable, presented at Stir Trek 2011. The world of JavaScript frameworks has changed greatly since then, but I still agree with the concepts.
MV* presentation frameworks in Javascript: en garde, pret, allez!Roberto Messora
HTML5 is the playing area, the strip, Javascript presentation frameworks are the fences and they are fierce and proud. In this presentation we will attend an interesting match between two of the emerging contenders in the MV* family: KnockoutJS and BackboneJS. We'll try to understand how they solve the same issues in modern web software development to better decide which one is suitable in our scenario.
Nessa apresentação demonstro como aplicar alguns dos Architecture Components disponíveis no Jetpack em uma arquitetura que segue o padrão Clean com MVVM.
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http://www.meetup.com/fr-FR/micbelgique/events/228368909/?eventId=228368909
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This presentation by Yaroslav Sviatkin (Senior Test Automation Engineer, Consultant, GlobalLogic, Kharkiv) was delivered at QA Fest 2017 (Kyiv) on September 22, 2017.
Nessa apresentação demonstro como aplicar alguns dos Architecture Components disponíveis no Jetpack em uma arquitetura que segue o padrão Clean com MVVM.
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http://www.meetup.com/fr-FR/micbelgique/events/228368909/?eventId=228368909
The presentation is devoted to the test framework GEB for testing WEB applications and Mobile. The report will be useful for those who want to know how fast to write tests in the programming language Groovy, and not think about framework, PageObject and initializing the WebDriver. Framework is difficult - no!
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JavaScript is lingua franca of the Web. It's pervasive and since 1999 a standard ( ECMAScript 262). Yes, there are other technologies you can use: Flash, Java Applets, Dart, but none of these have the overwhelming support and community that JavaScript does. Over the years it has been maligned as a poorly designed language but I will argue that it has just been misunderstood. This talk will focus on the fundamentals of the language and its integration with the browser, the DOM and server communication via JSON and Ajax.
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* Functional programming
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4 A JavaScript consists of lines of executable computer code.
5 It is usually embedded directly into HTML pages.
6 It is an interpreted language (means that scripts execute without preliminary compilation).
7 Everyone can use JavaScript without purchasing a license.
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Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
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June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...
01 Introduction - JavaScript Development
1. Introduction to
JavaScript Development
The Magic of Dynamic Web Pages
Doncho Minkov
Technical Trainer
http://minkov.it
Telerik Software Academy
academy.telerik.com
2. Table of Contents
Dynamic HTML
How to Create DHTML?
XHTML, CSS, JavaScript, DOM
Intro to JavaScript
History
JavaScript in Web Pages
JavaScript Syntax
Pop-up boxes
Debugging in JavaScript
2
4. What is DHTML?
Dynamic HTML (DHTML)
Makes possible a Web page to react and change
in response to the user’s actions
DHTML consists of HTML + CSS + JavaScript
DHTML
XHTML CSS JavaScript DOM
4
5. DTHML = HTML + CSS + JavaScript
HTML defines Web sitescontent through
semantic tags (headings, paragraphs, lists, …)
CSS defines 'rules'
or 'styles' for presenting
every aspect of an HTML document
Font (family, size, color, weight, etc.)
Background (color, image, position, repeat)
Position and layout (of any object on the page)
JavaScript defines dynamic behavior
Programming logic for interaction with the
user, to handle events, etc.
5
7. JavaScript
JavaScript
is a front-end scripting language
developed by Netscape for dynamic content
Lightweight, but with limited capabilities
Can be used as object-oriented language
Embedded in your HTML page
Interpreted by the Web browser
Client-side, mobile and desktop technology
Simple and flexible
Powerful to manipulate the DOM
7
8. JavaScript Advantages
JavaScript allows interactivity such as:
Implementing form validation
React to user actions, e.g. handle keys
Changing an image on moving mouse over it
Sections of a page appearing and disappearing
Content loading and changing dynamically
Performing complex calculations
Custom HTML controls, e.g. scrollable table
Implementing AJAX functionality
8
9. What Can JavaScript Do?
Can handle events
Can read and write HTML elements and
modify the DOM tree
Can validate form data
Can access / modify browser cookies
Can detect the user’s browser and OS
Can be used as object-oriented language
Can handle exceptions
Can perform asynchronous server calls (AJAX)
9
12. Using JavaScript Code
The JavaScript code can be placed in:
<script> tag in the head
<script> tag in the body - not recommended
External files, linked via <script> tag the head
Files usually have .js extension
<script src="scripts.js" type="text/javscript">
<!– code placed here will not be executed! -->
</script>
Highly recommended
The .js files get cached by the browser
12
13. JavaScript – When is Executed?
JavaScriptcode is executed during the page
loading or when the browser fires an event
All statements are executed at page loading
Some statements just define functions that can
be called later
Function calls
or code can be attached as
"event handlers" via tag attributes
Executed when the event is fired by the browser
<img src="logo.gif" onclick="alert('clicked!')" />
13
14. Calling a JavaScript Function
from Event Handler – Example
<html>
<head>
<script type="text/javascript">
function test (message) {
alert(message);
}
</script>
</head>
<body>
<img src="logo.gif"
onclick="test('clicked!')" />
</body>
</html>
14
19. JavaScript Syntax
The JavaScript syntax is similar to C#
Operators (+, *, =, !=, &&, ++, …)
Variables (typeless)
Conditional statements (if, else)
Loops (for, while)
Arrays (my_array[]) and associative arrays
(my_array['abc'])
Functions (can return value)
Function variables (like the C# delegates)
19
20. Standard Popup Boxes
Alert box with text and [OK] button
Just a message shown in a dialog box:
alert("Some text here");
Confirmation box
Contains text, [OK] button and [Cancel] button:
confirm("Are you sure?");
Prompt box
Contains text, input field with default value:
prompt ("enter amount", 10);
20
23. Built-in Browser Objects
The browser provides some read-only data via:
window
The top node of the DOM tree
Represents the browser's window
document
holds information the current loaded document
screen
Holds the user’s display properties
browser
Holds information about the browser
23
24. DOM Hierarchy – Example
window
navigator screen document history location
form form
button form
24
25. Opening New Window – Example
window.open()
window-open.html
var newWindow = window.open("", "sampleWindow",
"width=300, height=100, menubar=yes,
status=yes, resizable=yes");
newWindow.document.write(
"<html><head><title>
Sample Title</title>
</head><body><h1>Sample
Text</h1></body>");
newWindow.status =
"Hello folks";
25
26. The Navigator Object
alert(window.navigator.userAgent);
The browser The navigator in the The userAgent
window browser window (browser ID)
26
27. The Screen Object
The screen object contains information about
the display
window.moveTo(0, 0);
x = screen.availWidth;
y = screen.availHeight;
window.resizeTo(x, y);
27
28. Document and Location
document object
Provides some built-in arrays of specific objects
on the currently loaded Web page
document.links[0].href = "yahoo.com";
document.write(
"This is some <b>bold text</b>");
document.location
Used to access the currently open URL or
redirect the browser
document.location = "http://www.yahoo.com/";
28
31. The Math Object
The Math object provides some mathematical
functions
math.html
for (i=1; i<=20; i++) {
var x = Math.random();
x = 10*x + 1;
x = Math.floor(x);
document.write(
"Random number (" +
i + ") in range " +
"1..10 --> " + x +
"<br/>");
}
31
32. The Date Object
The Date object provides date / calendar
functions
dates.html
var now = new Date();
var result = "It is now " + now;
document.getElementById("timeField")
.innerText = result;
...
<p id="timeField"></p>
32
33. Timers: setTimeout()
Make something happen (once) after a fixed
delay
var timer = setTimeout('bang()', 5000);
5 seconds after this statement
executes, this function is called
clearTimeout(timer);
Cancels the timer
33
34. Timers: setInterval()
Make something happen repeatedly at fixed
intervals
var timer = setInterval('clock()', 1000);
This function is called
continuously per 1 second.
clearInterval(timer);
Stop the timer.
34
35. Timer – Example
timer-demo.html
<script type="text/javascript">
function timerFunc() {
var now = new Date();
var hour = now.getHours();
var min = now.getMinutes();
var sec = now.getSeconds();
document.getElementById("clock").value =
"" + hour + ":" + min + ":" + sec;
}
setInterval('timerFunc()', 1000);
</script>
<input type="text" id="clock" />
35
38. Debugging JavaScript
Modern browsers have JavaScript console
where errors in scripts are reported
Errors may differ across browsers
Several tools to debug JavaScript
Microsoft Script Editor
Add-on for Internet Explorer
Supports breakpoints, watches
JavaScript statement debugger; opens the script
editor
38
39. Firebug
Firebug – Firefox add-on for debugging
JavaScript, CSS, HTML
Supports breakpoints, watches, JavaScript
console editor
Very useful for CSS and HTML too
You can edit all the document real-time: CSS,
HTML, etc
Shows how CSS rules apply to element
Shows Ajax requests and responses
Firebug is written mostly in JavaScript
39
41. JavaScript Console Object
The console object exists
only if there is a
debugging tool that supports it
Used to write log messages at runtime
Methods of the console object:
debug(message)
info(message)
log(message)
warn(message)
error(message)
41