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JavaScript Functions

March 7, 2010

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 and in the 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 section.

<html>
<head>
<script type=”text/javascript”>
function displaymessage()
{
alert(“Hello World!”);
}
</script>
</head>

<body>
<form>
<input type=”button” value=”Click me!” onclick=”displaymessage()” />
</form>
</body>
</html>


Try it at w3s: http://www.w3schools.com/JS/tryit.asp?filename=tryjs_function1

Read on: http://www.w3schools.com/JS/js_functions.asp

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