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Prototype getDimensions() Method

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This method finds the computed width and height of element and returns them as key/value pairs of an object.

This method returns correct values on elements whose display is set to none either in an inline style rule or in an CSS stylesheet.

Note that the value returned is a number only although it is expressed in pixels.

Syntax:

element.getDimensions();

Return Value:

Example:

<html>
<head>
<title>Prototype examples</title>
<script type="text/javascript" 
   src="/javascript/prototype.js">
</script>
<script>

function showResult(){
   var dimensions = $('rectangle').getDimensions();
   alert("Element width is " +  dimensions.width );
   alert("Element height is " +  dimensions.height );
}
</script>
</head>

<body>

   <p>Click the button to see the result.</p>

   <div id="rectangle" 
           style="font-size: 10px; width: 20em; height: 10em">
        <p>This is the paragraph.</p>
   </div>

   <br />
   <input type="button" value="showResult" 
             onclick="showResult();"/>

</body>
</html>

To understand it in better way you can Try it yourself.


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