Method of parsing xml with javascript to realize three-level linkage of provinces, cities and counties

Method of parsing xml with javascript to realize three-level linkage of provinces, cities and counties_javascript skills

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May 16, 2016 pm 03:49 PM

javascriptxmlLevel three linkage

The example in this article describes the method of javascript parsing xml to achieve three-level linkage of provinces, cities and counties. Share it with everyone for your reference. The specific implementation method is as follows:

(This method works in any common browser)

<body>
  <div>
  <span>
   <select id="sheng" style="width: 100px"></select>
  </span>
  <span>
   <select id="shi" style="width: 100px"></select>
  </span>
  <span>
   <select id="xian" style="width: 100px"></select>
  </span>
  </div>
 </body>
</html>
<script type="text/javascript">
<!--
function getXmlDoc(){
var xmlDoc;
try{
//给IE浏览器 创建一个空的微软 XML文档对象
xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
}catch(err){
try{
//在 Firefox及其他浏览器(opera)中的 XML解析器创建一个空的 XML文档对象。 
xmlDoc=document.implementation.createDocument("","",null);
}catch(er){
alert("所使用的浏览器版本太低了,该换更新了");
}
}
//关闭异步加载，这样确保在文档完全加载之前解析器不会继续脚本的执行
xmlDoc.async=false;
//解析器加载名为 "xxx.xml" 的 XML 文档
xmlDoc.load("city.xml");
return xmlDoc;
}
window.onload=function(){
var xmlDoc=getXmlDoc();
//获取xml文件的根节点
var root=xmlDoc.documentElement;
//获取xml文件的根节点下面的省节点
var provinces=root.childNodes;
//获取页面中要显示的省、市和县的控件dom对象
var sheng=document.getElementById("sheng");
var shi=document.getElementById("shi");
var xian=document.getElementById("xian");
 //遍历所有的省 
for(var i=0;i<provinces.length;i++){
 //查看该节点是否是元素节点 也是为了实现不同浏览器之间的兼容性 问 题(1是元素节点 Node.ELEMENT_NODE  ---1  -- 元素节点)
if(provinces[i].nodeType==1){
//创建一个option节点对象
var shengopt=document.createElement("option");
//为option省节点添加文本 shengopt.appendChild(document.createTextNode(provinces[i].getAttr ibute("name")));
//为option省节点设置属性 shengopt.setAttribute("value",provinces[i].getAttribute("postcode "));
  //添加省到页面dom对象中
sheng.appendChild(shengopt);
}
}
//当省节点发生改变时 触发事件
sheng.onchange=function(){
//获取省节点所有的option对象的集合
var shengs=sheng.options;
//获取选中option对象的selectedIndex(下标值)
var num=shengs.selectedIndex;
//清空市 区  
shi.length=0;
xian.length=0;
//根据选中的省获取其value值的内容 即xml文件中的postcode对应的 值
var ppostcode=shengs[num].getAttribute("value");
//遍历所有的省
for(var i=0;i<provinces.length;i++){
//查看该节点是否是元素节点 也是为了实现不同浏览器之间的兼 容性问题(1是元素节点 Node.ELEMENT_NODE  ---1  -- 元素 节点)
if(provinces[i].nodeType==1){
//根据省获取其postcode值的内容 即html文件中的value对应 的值
var postcode=provinces[i].getAttribute("postcode");
if(postcode==ppostcode){
//获取省节点的子节点
var cities=provinces[i].childNodes;
//清空
shi.length=0;
//遍历所有的市
for(var i=0;i<cities.length;i++){
//查看该节点是否是元素节点 也是为了实现不同浏览 器之间的兼容性问题(1是元素节点 Node.ELEMENT_NODE  ---1  -- 元素节点)
if(cities[i].nodeType==1){
//创建一个option节点对象
var shiopt=document.createElement("option");
//为option市节点添加文本 shiopt.appendChild(document.createTextNode(cities[i].getAttribute ("name")));
//为option市节点设置属性
shiopt.setAttribute("value", cities[i].getAttribute("postcode"));
 //添加市到页面dom对象中
shi.appendChild(shiopt);
}
}
break;
}
}
}
}
//当市节点发生改变时 触发事件
shi.onchange=function(){
//获取市节点所有的option对象的集合
var shis=shi.options;
//获取选中option对象的selectedIndex(下标值)
var num=shis.selectedIndex;
//根据选中的市获取其value值的内容 即xml文件中的postcode对应的 值
var spostcode=shis[num].getAttribute("value");
//遍历所有的省
for(var i=0;i<provinces.length;i++){
//查看该节点是否是元素节点 也是为了实现不同浏览器之间的兼 容性问题(1是元素节点 Node.ELEMENT_NODE  ---1  -- 元素 节点)
if(provinces[i].nodeType==1){
//获取省节点的子节点
var cities=provinces[i].childNodes;
//遍历所有的市
for(var j=0;j<cities.length;j++){
//查看该节点是否是元素节点 也是为了实现不同浏览器之 间的兼容性问题(1是元素节点 Node.ELEMENT_NODE   ---1  -- 元素节点)
if(cities[j].nodeType==1){
//根据市获取其postcode值的内容 即html文件中的 value对应的值
var postcode=cities[j].getAttribute("postcode");
if(postcode==spostcode){
//清空
xian.length=0;
//获取市节点的子节点
var areas=cities[j].childNodes;
//遍历所有的区(县)
for(var k=0;k<areas.length;k++){
//查看该节点是否是元素节点 也是为了实现不 同浏览器之间的兼容性问题(1是元素节点 Node.ELEMENT_NODE  ---1  -- 元素节点)
if(areas[k].nodeType==1){
//创建一个option节点对象
var xianopt=document.createElement("option");
//为option区节点添加文本
xianopt.appendChild(document.createTextNode(areas[k].getAttribute ("name")));
//为option区节点设置属性
xianopt.setAttribute("value", areas[k].getAttribute("postcode"));
 //添加区到页面dom对象中
xian.appendChild(xianopt);
}
}
break;
}
}
}
}
}
}
}
//-->
</script>

Xml file (abbreviated version)

<root name="中国">
 <province name="请选择省" postcode="100000" >
  <city name="请选择市" postcode="100100" >
 <area name="请选择区" postcode="100101" />
</city>
 </province>
 <province name="北京市" postcode="110000" >
  <city name="市辖区" postcode="110100" >
    <area name="东城区" postcode="110101" />
    <area name="西城区" postcode="110102" />
    <area name="崇文区" postcode="110103" />
    <area name="宣武区" postcode="110104" />
    <area name="朝阳区" postcode="110105" />
    <area name="丰台区" postcode="110106" />
    <area name="石景山区" postcode="110107" />
    <area name="海淀区" postcode="110108" />
    <area name="门头沟区" postcode="110109" />
    <area name="房山区" postcode="110111" />
    <area name="通州区" postcode="110112" />
    <area name="顺义区" postcode="110113" />
    <area name="昌平区" postcode="110114" />
    <area name="大兴区" postcode="110115" />
    <area name="怀柔区" postcode="110116" />
    <area name="平谷区" postcode="110117" />
  </city>
  <city name="县" postcode="110200" >
    <area name="密云县" postcode="110228" />
    <area name="延庆县" postcode="110229" />
  </city>
 </province>
</root>

I hope this article will be helpful to everyone’s JavaScript programming design.

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