IMAGE MAP
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 that 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 code
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>
Output
You can feel the map concept by placing the mouse cursor on the image
object.
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