Chapter: Web or internet Programming : Scripting Elements

JavaScript - Functions

To keep the browser from executing a script when the page loads, put script into a function. A function contains code that will be executed by an event or by a call to the function.

Functions

• To keep the browser from executing a script when the page loads, put 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 <head> and in the <body> 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 <head> section.

Syntax

function functionname(var1,var2,...,varX)

{

some code

}

Note: The word function must be written in lowercase letters, otherwise a JavaScript error occurs! Also note that call a function with the exact same capitals as in the function name.

Example

<html>

<head>

{

alert("Hello World!");

}

</script>

</head>

<body>

<form>

</body>

</html>

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Web or internet Programming : Scripting Elements : JavaScript - Functions |