数据岛是指存在于HTML页面中的XML代码。数据岛允许你在HTML页面中集成XML，对XML编 写脚本，而不需要通过脚本或<OBJECT>标签读取XML。几乎所有能够存在于一个结构完整 的XML文档中的东西都能存在于一个数据岛中。包括处理指示、DOCTYPE声明和内部子集 。（注意，编码串不能放在数据岛中。)
<XML>元素标记数据岛的开始，它的ID属性提供了一个可以用来引用数据岛的名称。
<script language="javascript">...
var xmlID = "xmlcmbtree";
var cmbPrefix = "xmlcmb";
var nMaxLevel = 3;
var tblName = "tbl";
function CreateList(nLevel)
...{
var doc = document.all("xmlcmbtree").documentElement;
var nodes, nIndex, node;
nodes = doc.childNodes;
for (var i=1; i < nLevel;i++)
...{
nIndex = document.all(cmbPrefix + i).selectedIndex;
node = nodes[nIndex];
nodes = node.childNodes;
}
var cmb = document.all(cmbPrefix + nLevel);
if (!cmb)
...{
cmb = document.createElement("SELECT");
cmb.id = cmbPrefix + nLevel;
cmb.onchange = new Function("ChangeSelection(" + nLevel + ")");
//document.body.appendChild(cmb);
var cell = document.all(tblName).rows[1].insertCell();
cell.appendChild(cmb);
cell = document.all(tblName).rows[0].insertCell();
var label = document.createElement("SPAN");
label.style.fontWeight = "bold";
label.style.color = "red";
label.innerHTML = nodes[0].nodeName + ":";
cell.appendChild(label);
// document.body.insertBefore(label,cmb)
}
cmb.options.length = 0;
for (i=0; i < nodes.length;i++)
...{
var opt = new Option(nodes[i].getAttribute("text"),nodes[i].getAttribute("value"));
cmb.options.add(opt);
}
ChangeSelection(nLevel);
}
function ChangeSelection(nLevel)
...{
if (nLevel < nMaxLevel)
CreateList(nLevel+1);
}
</script>
<body onload="CreateList(1);">
<!-- 用JSP生成就可以了 !-->
<xml id="xmlcmbtree">
<country>
<province text="Jiang Su" value="Jiang Su">
<city text="Nan Jing" value="Nan Jing">
<street text="Xin Jie Kou" value="Xin Jie Kou" />
<street text="Dong Jia Xiang" value="Dong Jia Xiang" />
</city>
<city text="Su Zhou" value="Su Zhou">
<street text="Guan Qian Jie" value="Guan Qian Jie" />
<street text="Re Min Lu" value="Re Min Lu" />
</city>
</province>
<province text="Beijing" value="Beijing">
<city text="Beijing" value="Beijing">
<street text="Xin Jie Kou" value="Xin Jie Kou" />
<street text="Si Huan Lu" value="Si Huan Lu" />
<street text="Xue Yuan Lu" value="Xue Yuan Lu" />
</city>
</province>
<province text="Hei Bei" value="Hei Bei">
<city text="Shi Jia Zhuang" value="Shi Jia Zhuang">
<street text="Ren Min Lu" value="Ren Min Lu" />
</city>
</province>
</country>
</xml>
<table id="tbl" border="1" cellspacing="0" cellpadding="0"">
<tr></tr>
<tr></tr>
</table>
</body>
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