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Javascript
 

Javascript

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Presentation on Java Script

Presentation on Java Script

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    Javascript Javascript Presentation Transcript

      • Introducing JavaScript
      • by Rama Krishnam Raju
      • JavaScript is the scripting language of the Web .
      • JavaScript is used in billions of Web pages to improve the design, validate forms, detect browsers, create cookies, and much more .
      • JavaScript is the most popular scripting language on the internet, and works in all major browsers, such as Internet Explorer, Mozilla, Firefox, Netscape, Opera .
      • What You Should Already Know .
      • Before you continue you should have a basic understanding of the following :
        • HTML .
      • 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
    • Introducing JavaScript
      • Are Java and JavaScript the same ?
        • NO!.
        • Java and JavaScript are two completely different languages in both concept and design!
        • Java (developed by Sun Microsystems) is a powerful and much more complex programming language - in the same category as C and C++.
      • Learning JavaScript ?
        • Special syntax to learn !.
        • Learn the basics and then use other people‘s(lots of free sites)
        • Write it in a text editor, view results in browser
        • You need to revise your HTML
    • Introducing JavaScript
      • 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(&quot;<h1>&quot; + name + &quot;</h1>&quot;) can write a variable text into an HTML page
        • 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
    • Introducing JavaScript
      • Arithmetic Operators
      • Arithmetic operators are used to
      • perform arithmetic between variables and/or values.
      • The following table explains the arithmetic operators
    • Introducing JavaScript
      • Assignment Operators
      • Assignment operators are used to assign values to JavaScript variables.
      • The following table explains the assignment operators
    • Introducing JavaScript
      • Comparison Operators
      • Comparison operators are used to compare values to JavaScript variables.
      • The following table explains the Comparison operators
    • Introducing JavaScript
      • Logical Operators
      • Logical operators are used to compare logical values to JavaScript variables.
      • The following table explains the Logical operators
    • Introducing JavaScript
      • How to Put a JavaScript Into an HTML Page?
        • <html>
        • <body>
        • <script type=&quot;text/javascript&quot;>
        • document.write(&quot;Hello World!&quot;)
        • </script>
        • </body>
        • </html>
    • Introducing JavaScript
      • Using Form Data ?
      • <script type=&quot;text/javascript&quot;>
      • function GetTextBoxValue(id) {
      • alert(document.getElementById(id).value);
      • }
      • </script>
      • <asp:TextBox ID=&quot;txt1&quot; runat=&quot;server&quot;></asp:TextBox>
      • <asp:Button ID=&quot;btnalert&quot; runat=&quot;server&quot; Text=&quot;Submit&quot; OnClientClick=&quot;javascript:GetTextBoxValue('txt1');&quot; />
    • Introducing JavaScript
      • 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 &quot;OK&quot; or &quot;Cancel&quot; to proceed.
        • If the user clicks &quot;OK&quot;, the box returns true. If the user clicks &quot;Cancel&quot;, the box returns false.
    • Introducing JavaScript
      • 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 &quot;OK&quot; or &quot;Cancel&quot; to proceed after entering an input value.
        • If the user clicks &quot;OK“, the box returns the input value. If the user clicks &quot;Cancel“, the box returns null.
      • Thank You !