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External JavaScript
JavaScript code can be written in a file and saved with the .js extension and this file can then be linked inside the
<HEAD> and </HEAD> tags of the HTML document in which we want to add this code. The SRC attribute of the
<script> tag allows to give path of the JavaScript file. The syntax to add external JavaScript is:
<HEAD>
<SCRIPT TYPE="text/javascript" SRC="D:\first.js">
</SCRIPT>
</HEAD>
Note that there are many other scripting languages, hence, it is recommended to use the TYPE attribute with the
<SCRIPT> tag and set its value to Text/JavaScript to specify that scripting language we are using.
Creating a Web Page with External Javascript
To use external JavaScript, follow the given steps:
Step 1: Open the Notepad and type the following line:
alert("Hello World");
Step 2: Save the file with .js extension.
Step 3: Open another Notepad and type the following code:
<HTML>
<HEAD>
<TITLE> My First JavaScript </TITLE>
<SCRIPT TYPE="Text/javascript" SRC="external.js">
</SCRIPT>
</HEAD>
<BODY>
This message box is displayed using external JavaScript.
</BODY>
</HTML>
Step 4: Save the file with .html extension and open the web page in a web browser. You will get the same output as
the previous web page.
326 Touchpad Web Applications-XI

