Create a new .js file called JavaScript.js (you can name it anything you like) and place following code inside.
function AlertMe()
{
alert("I am being called from external JavaScript file");
}
Note that JavaScript code is not wrapped with <script>
tag if it is written in external .js file.
Now keep following script tag under <head>
tag of the html page. Ideally the script blocks should be placed in the <head>
tag however it’s not mandatory.
<script language="javascript" type="text/javascript" src="JavaScript.js"></script>
JavaScript code in external file
Now the AlertMe()
method can be called from the html page on any event of the HTML page like onclick, onchange etc.
<input type="button" id="btnTest" onclick="AlertMe()" value="Click me!" />
JavaScript code in external file
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