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Javascript Image Map

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You can use JavaScript to create client side image map. Client side image maps are enabled by the usemap attribute for the <img /> tag and defined by special <map> and <area> extension tags.

The image that is going to form the map is inserted into the page using the <img /> element as normal, except it carries an extra attribute called usemap. The value of the usemap attribute is the value of the name attribute on the <map> element, which you are about to meet, preceded by a pound or hash sign.

The <map> element actually creates the map for the image and usually follows directly after the <img /> element. It acts as a container for the <area /> elements that actually define the clickable hotspots. The <map> element carries only one attribute, the name attribute, which is the name that identifies the map. This is how the <img /> element knows which <map> element to use.

The <area> element specifies the shape and the coordinates that define the boundaries of each clickable hotspot.

The following combines imagemaps and JavaScript to produce a message in a text box when the mouse is moved over different parts of an image.


<html>
<head>
<title>Using JavaScript Image Map</title>
<script type="text/javascript">
<!--
function showTutorial(name){
  document.myform.stage.value = name
}
//-->
</script>
</head>
<body>
<form name="myform">
   <input type="text" name="stage" size="20" />
</form>
<!-- Create  Mappings -->
<img src="/images/usemap.gif" alt="HTML Map" 
        border="0" usemap="#tutorials"/>

<map name="tutorials">
   <area shape="poly" 
            coords="74,0,113,29,98,72,52,72,38,27"
            href="/perl/index.htm" alt="Perl Tutorial"
            target="_self" 
            onMouseOver="showTutorial('perl')" 
            onMouseOut="showTutorial('')"/>

   <area shape="rect" 
            coords="22,83,126,125"
            href="/html/index.htm" alt="HTML Tutorial" 
            target="_self" 
            onMouseOver="showTutorial('html')" 
            onMouseOut="showTutorial('')"/>

   <area shape="circle" 
            coords="73,168,32"
            href="/php/index.htm" alt="PHP Tutorial"
	        target="_self" 
            onMouseOver="showTutorial('php')" 
            onMouseOut="showTutorial('')"/>
</map>
</body>
</html>

This will produce following result. Move your mouse around and see the changes:

HTML Map Perl Tutorial HTML Tutorial PHP Tutorial

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


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