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JavaScript Cert. Exam
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User Designed Functions


You can also create your own functions to perform the desired tasks in the code. A user defined function is written using the function keyword followed by the name of the function. These Functions are usually defined in <Head> tag in JavaScript so that they are available as the page is loaded.

 

Syntax

function myfunction1()

{

 // ….statements …..

}

 

Example

<html>

<head>

<script type="text/javascript">

// The code has two user defined functions

// that allow you to change the background color of the web page.

function changeBgRed()

  {

   document.bgColor = "red";

  } 

function changeBgBlue()

  {

   document.bgColor = "blue";

  }

</script>

</head>

 

<body

<p align="center">

 

 <span onclick="changeBgRed();">Red</span> |

 <span onclick="changeBgBlue();">Blue</span>

</p>

</body>

</html>

 

You can add more features to functions to make them more useful for example: you can pass values to functions or return values from them. In addition, you can prompt users to get values from them.

 

Example

<html>

<head>

<script type="text/javascript">

// Modified the code pass value to the function

function changeBg(color)

{

   document.bgColor = color;

}

</script>

</head>

<body

<p align="center">

  <span onclick="changeBg('red');">Red</span> |

 <span onclick="changeBg('blue');">Blue</span>

</p>

</body>

</html>

 


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