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解析xml文件实现省市县三级联动

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解析xml文件实现省市县三级联动

我是做Java程序开发的,js省市县三级级联。
首先说一下什么是js省市县三级级联?js省市县三级级联是指,当你选择一个省的时候,程序会默认的把该省的城市列入城市的下拉列表框中,同样的,当你选择一个城市的时候,程序会默认的把该城市的县列入县的下拉列表框中。
实现js省市三级联动需要两个文件。
一、xml文件;
二、html文件;
 
下面我简单的写了一个xml文件
<?xml version="1.0" encoding="UTF-8"?>
<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>
  <province name="天津市" postcode="120000" >
    <city name="市辖区" postcode="120100" >
        <area name="和平区" postcode="120101" />
        <area name="河东区" postcode="120102" />
        <area name="河西区" postcode="120103" />
        <area name="南开区" postcode="120104" />
        <area name="河北区" postcode="120105" />
        <area name="红桥区" postcode="120106" />
        <area name="塘沽区" postcode="120107" />
        <area name="汉沽区" postcode="120108" />
        <area name="大港区" postcode="120109" />
        <area name="东丽区" postcode="120110" />
        <area name="西青区" postcode="120111" />
        <area name="津南区" postcode="120112" />
        <area name="北辰区" postcode="120113" />
        <area name="武清区" postcode="120114" />
        <area name="宝坻区" postcode="120115" />
    </city>
    <city name="县" postcode="120200" >
        <area name="宁河县" postcode="120221" />
        <area name="静海县" postcode="120223" />
        <area name="蓟县" postcode="120225" />
    </city>
  </province>

  <province name="河北省" postcode="130000" >
    <city name="石家庄市" postcode="130100" >
        <area name="长安区" postcode="130102" />
        <area name="桥东区" postcode="130103" />
        <area name="桥西区" postcode="130104" />
        <area name="新华区" postcode="130105" />
        <area name="井陉矿区" postcode="130107" />
        <area name="裕华区" postcode="130108" />
        <area name="井陉县" postcode="130121" />
        <area name="正定县" postcode="130123" />
        <area name="栾城县" postcode="130124" />
        <area name="行唐县" postcode="130125" />
        <area name="灵寿县" postcode="130126" />
        <area name="高邑县" postcode="130127" />
        <area name="深泽县" postcode="130128" />
        <area name="赞皇县" postcode="130129" />
        <area name="无极县" postcode="130130" />
        <area name="平山县" postcode="130131" />
        <area name="元氏县" postcode="130132" />
        <area name="赵县" postcode="130133" />
        <area name="辛集市" postcode="130181" />
        <area name="藁城市" postcode="130182" />
        <area name="晋州市" postcode="130183" />
        <area name="新乐市" postcode="130184" />
        <area name="鹿泉市" postcode="130185" />
    </city>
    <city name="唐山市" postcode="130200" >
        <area name="路南区" postcode="130202" />
        <area name="路北区" postcode="130203" />
        <area name="古冶区" postcode="130204" />
        <area name="开平区" postcode="130205" />
        <area name="丰南区" postcode="130207" />
        <area name="丰润区" postcode="130208" />
        <area name="滦县" postcode="130223" />
        <area name="滦南县" postcode="130224" />
        <area name="乐亭县" postcode="130225" />
        <area name="迁西县" postcode="130227" />
        <area name="玉田县" postcode="130229" />
        <area name="唐海县" postcode="130230" />
        <area name="遵化市" postcode="130281" />
        <area name="迁安市" postcode="130283" />
    </city>
    <city name="秦皇岛市" postcode="130300" >
        <area name="海港区" postcode="130302" />
        <area name="山海关区" postcode="130303" />
        <area name="北戴河区" postcode="130304" />
        <area name="青龙满族自治县" postcode="130321" />
        <area name="昌黎县" postcode="130322" />
        <area name="抚宁县" postcode="130323" />
        <area name="卢龙县" postcode="130324" />
    </city>
    <city name="邯郸市" postcode="130400" >
        <area name="邯山区" postcode="130402" />
        <area name="丛台区" postcode="130403" />
        <area name="复兴区" postcode="130404" />
        <area name="峰峰矿区" postcode="130406" />
        <area name="邯郸县" postcode="130421" />
        <area name="临漳县" postcode="130423" />
        <area name="成安县" postcode="130424" />
        <area name="大名县" postcode="130425" />
        <area name="涉县" postcode="130426" />
        <area name="磁县" postcode="130427" />
        <area name="肥乡县" postcode="130428" />
        <area name="永年县" postcode="130429" />
        <area name="邱县" postcode="130430" />
        <area name="鸡泽县" postcode="130431" />
        <area name="广平县" postcode="130432" />
        <area name="馆陶县" postcode="130433" />
        <area name="魏县" postcode="130434" />
        <area name="曲周县" postcode="130435" />
        <area name="武安市" postcode="130481" />
    </city>
    <city name="邢台市" postcode="130500" >
        <area name="桥东区" postcode="130502" />
        <area name="桥西区" postcode="130503" />
        <area name="邢台县" postcode="130521" />
        <area name="临城县" postcode="130522" />
        <area name="内丘县" postcode="130523" />
        <area name="柏乡县" postcode="130524" />
        <area name="隆尧县" postcode="130525" />
        <area name="任县" postcode="130526" />
        <area name="南和县" postcode="130527" />
        <area name="宁晋县" postcode="130528" />
        <area name="巨鹿县" postcode="130529" />
        <area name="新河县" postcode="130530" />
        <area name="广宗县" postcode="130531" />
        <area name="平乡县" postcode="130532" />
        <area name="威县" postcode="130533" />
        <area name="清河县" postcode="130534" />
        <area name="临西县" postcode="130535" />
        <area name="南宫市" postcode="130581" />
        <area name="沙河市" postcode="130582" />
    </city>
    <city name="保定市" postcode="130600" >
        <area name="新市区" postcode="130602" />
        <area name="北市区" postcode="130603" />
        <area name="南市区" postcode="130604" />
        <area name="满城县" postcode="130621" />
        <area name="清苑县" postcode="130622" />
        <area name="涞水县" postcode="130623" />
        <area name="阜平县" postcode="130624" />
        <area name="徐水县" postcode="130625" />
        <area name="定兴县" postcode="130626" />
        <area name="唐县" postcode="130627" />
        <area name="高阳县" postcode="130628" />
        <area name="容城县" postcode="130629" />
        <area name="涞源县" postcode="130630" />
        <area name="望都县" postcode="130631" />
        <area name="安新县" postcode="130632" />
        <area name="易县" postcode="130633" />
        <area name="曲阳县" postcode="130634" />
        <area name="蠡县" postcode="130635" />
        <area name="顺平县" postcode="130636" />
        <area name="博野县" postcode="130637" />
        <area name="雄县" postcode="130638" />
        <area name="涿州市" postcode="130681" />
        <area name="定州市" postcode="130682" />
        <area name="安国市" postcode="130683" />
        <area name="高碑店市" postcode="130684" />
    </city>
    <city name="张家口市" postcode="130700" >
        <area name="桥东区" postcode="130702" />
        <area name="桥西区" postcode="130703" />
        <area name="宣化区" postcode="130705" />
        <area name="下花园区" postcode="130706" />
        <area name="宣化县" postcode="130721" />
        <area name="张北县" postcode="130722" />
        <area name="康保县" postcode="130723" />
        <area name="沽源县" postcode="130724" />
        <area name="尚义县" postcode="130725" />
        <area name="蔚县" postcode="130726" />
        <area name="阳原县" postcode="130727" />
        <area name="怀安县" postcode="130728" />
        <area name="万全县" postcode="130729" />
        <area name="怀来县" postcode="130730" />
        <area name="涿鹿县" postcode="130731" />
        <area name="赤城县" postcode="130732" />
        <area name="崇礼县" postcode="130733" />
    </city>
    <city name="承德市" postcode="130800" >
        <area name="双桥区" postcode="130802" />
        <area name="双滦区" postcode="130803" />
        <area name="鹰手营子矿区" postcode="130804" />
        <area name="承德县" postcode="130821" />
        <area name="兴隆县" postcode="130822" />
        <area name="平泉县" postcode="130823" />
        <area name="滦平县" postcode="130824" />
        <area name="隆化县" postcode="130825" />
        <area name="丰宁满族自治县" postcode="130826" />
        <area name="宽城满族自治县" postcode="130827" />
        <area name="围场满族蒙古族自治县" postcode="130828" />
    </city>
    <city name="沧州市" postcode="130900" >
        <area name="新华区" postcode="130902" />
        <area name="运河区" postcode="130903" />
        <area name="沧县" postcode="130921" />
        <area name="青县" postcode="130922" />
        <area name="东光县" postcode="130923" />
        <area name="海兴县" postcode="130924" />
        <area name="盐山县" postcode="130925" />
        <area name="肃宁县" postcode="130926" />
        <area name="南皮县" postcode="130927" />
        <area name="吴桥县" postcode="130928" />
        <area name="献县" postcode="130929" />
        <area name="孟村回族自治县" postcode="130930" />
        <area name="泊头市" postcode="130981" />
        <area name="任丘市" postcode="130982" />
        <area name="黄骅市" postcode="130983" />
        <area name="河间市" postcode="130984" />
    </city>
    <city name="廊坊市" postcode="131000" >
        <area name="安次区" postcode="131002" />
        <area name="广阳区" postcode="131003" />
        <area name="固安县" postcode="131022" />
        <area name="永清县" postcode="131023" />
        <area name="香河县" postcode="131024" />
        <area name="大城县" postcode="131025" />
        <area name="文安县" postcode="131026" />
        <area name="大厂回族自治县" postcode="131028" />
        <area name="霸州市" postcode="131081" />
        <area name="三河市" postcode="131082" />
    </city>
    <city name="衡水市" postcode="131100" >
        <area name="桃城区" postcode="131102" />
        <area name="枣强县" postcode="131121" />
        <area name="武邑县" postcode="131122" />
        <area name="武强县" postcode="131123" />
        <area name="饶阳县" postcode="131124" />
        <area name="安平县" postcode="131125" />
        <area name="故城县" postcode="131126" />
        <area name="景县" postcode="131127" />
        <area name="阜城县" postcode="131128" />
        <area name="冀州市" postcode="131181" />
        <area name="深州市" postcode="131182" />
    </city>
  </province>
</root>

 

在这就列出北京、天津、河北的部分城市。其他省市大家可以自行完善
接下来就是html文件:
具体代码如下:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		<title>city.html</title>

		<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
		<meta http-equiv="description" content="this is my page">
		<meta http-equiv="content-type" content="text/html; charset=UTF-8">

		<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

	</head>

	<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">
<!--
//获取xmlDoc对象
function getXmlDoc(){
var xmlDoc;
  try{
     //IE浏览器
      xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
  }catch(err){
     try{
    //firefox 其他浏览器
    xmlDoc = document.implementation.createDocument("","",null);
    }catch(er){
      alert("您的浏览器实在是太低........");
    }
  }
  //关闭异步加载,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;
  //转载xml文件
  xmlDoc.load("city.xml");
  return xmlDoc;
}
  
  /*
  备注说明:不能把 getXmlDoc()方法中的代码放入到window.onload事件函数中
  因为在opera11.01版本中会出现xmlDoc.async<window.onload的异常信息
   XMLHttpRequest to files is disabled for security reasons.
==> Set "Allow File XMLHttpRequest" with opera:config#UserPrefs|AllowFileXMLHttpRequest to disable this security check.
 //为了支持opera11.01必须在服务器页面中访问.

  */
  window.onload = function (){
	   //通过方法获取对象
     var xmlDoc = getXmlDoc();
     //获取xml文件的根节点
     var root = xmlDoc.documentElement;
     //获得所有的省节点
     var provinces = root.childNodes;
     //获取页面中要显示的省的控件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
         if(provinces[i].nodeType ==1 ){ 
        	 //创建option节点对象
           var shengopt = document.createElement("option");   
        	 //为省节点添加文本节点
           shengopt.appendChild(document.createTextNode(provinces[i].getAttribute("name")));
           //为省节点添加属性
          shengopt.setAttribute("value",provinces[i].getAttribute("postcode"));
          
           //添加省道页面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
         if(provinces[i].nodeType ==1 ){ 
             var postcode =  provinces[i].getAttribute("postcode");  
             if(postcode==ppostcode){
            	var cities = provinces[i].childNodes;
                shi.length=0;
            	for(var i=0;i<cities.length;i++){
    		  
            		if(cities[i].nodeType ==1){
	    			  var shiopt = document.createElement("option");
	    			   shiopt.appendChild(document.createTextNode(cities[i].getAttribute("name")));
	                   shiopt.setAttribute("value",cities[i].getAttribute("postcode"));
	    		       shi.appendChild(shiopt);
    		         }
    	        }
            	 break;
             }
             
             
          }
           
       }
 	
     }




shi.onchange = function(){
 
 var shis = shi.options;
 var num = shis.selectedIndex;
    	  
 var spostcode = shis[num].getAttribute("value");
    	   
    	     //遍历所有的省
     for(var i=0;i<provinces.length;i++){
    	 if(provinces[i].nodeType==1){
    		 var cities = provinces[i].childNodes;
    		 for(var j=0;j<cities.length;j++){
    			 if(cities[j].nodeType==1){
    				 var postcode = cities[j].getAttribute("postcode");
    				 if(postcode == spostcode){
    					 xian.length=0;
    					 var areas = cities[j].childNodes;
    					 for(var k=0;k<areas.length;k++){
    						 if(areas[k].nodeType == 1){
    							   var xianopt = document.createElement("option");
	    			               xianopt.appendChild(document.createTextNode(areas[k].getAttribute("name")));
	                               xianopt.setAttribute("value",areas[k].getAttribute("postcode"));
	    		                   xian.appendChild(xianopt);
    						 }
    						
    					 }
    					  break;
    				 }
    			 }
    		 }
    		 
    	 }
      }
    	     
    	     
     }
  }
//-->
</script>

 

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