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javascript教程——基础教程

JavaScript 图像地图
作者：不详   2008-5-1

图像地图指的是带有可点击区域的图像。

JavaScript 图像地图

我们已经从 HTML 教程中了解到，图像地图是带有可点击区域的图像。通常情况下，每个区域是一个相关的超级链接。单击某个区域，就回到达相关的链接。

实例

下面的例子演示如何创建带有可点击区域的 html 图像地图：

<img src ="planets.gif" width ="145" height ="126"  
alt="Planets"usemap ="#planetmap" /> 

<map id ="planetmap" name="planetmap"> 
<area shape ="rect" coords ="0,0,82,126" href ="sun.htm" target ="_blank" 
  alt="Sun" /> 
<area shape ="circle" coords ="90,58,3" href ="mercur.htm" target ="_blank" 
  alt="Mercury" /> 
<area shape ="circle" coords ="124,58,8" href ="venus.htm" target ="_blank" 
  alt="Venus" /> 
</map>

结果

添加 JavaScript

我们可向图像地图内部的 <area> 标签添加（能调用JavaScript的）事件。<area>标签支持以下事件：onClick、onDblClick、onMouseDown、onMouseUp、onMouseOver、onMouseMove、onMouseOut、onKeyPress、onKeyDown、onKeyUp、onFocus和onBlur。

这是添加了 JavaScript 的上面的例子：

<html> 
<head> 
<script type="text/javascript"> 
function writeText(txt) 
{ 
document.getElementById("desc").innerHTML=txt 
} 
</script> 
</head> 

<body> 
<img src="planets.gif" width="145" height="126" 
alt="Planets" usemap="#planetmap" /> 

<map id ="planetmap" name="planetmap"> 
<area shape ="rect" coords ="0,0,82,126" 
onMouseOver="writeText('The Sun and the gas giant 
planets like Jupiter are by far the largest objects 
in our Solar System.')" 
href ="sun.htm" target ="_blank" alt="Sun" /> 

<area shape ="circle" coords ="90,58,3" 
onMouseOver="writeText('The planet Mercury is very 
difficult to study from the Earth because it is 
always so close to the Sun.')" 
href ="mercur.htm" target ="_blank" alt="Mercury" /> 

<area shape ="circle" coords ="124,58,8" 
onMouseOver="writeText('Until the 1960s, Venus was 
often considered a twin sister to the Earth because 
Venus is the nearest planet to us, and because the 
two planets seem to share many characteristics.')" 
href ="venus.htm" target ="_blank" alt="Venus" /> 
</map>  

<p id="desc"></p> 

</body> 
</html>
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