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.
Example
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">functionshowTutorial(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></pre>
Output
You can feel the map concept by placing the mouse cursor on the image
Leave a Reply