You can use JavaScript to create a 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 a 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.
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 a 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>The following output is displayed on successful execution of the above code. You can feel the map concept by placing the mouse cursor on the image object.
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