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承——级联实现

浏览器XMLJ#IE脚本 
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//承接xml浏览器兼容问题解决的具体实现方法 因xml 代码过多故贴出部分（省市区三级联动）


<body>
		<div>

			<span> <select id="sheng" style="width:100px;">
					<option>
						请选择省
					</option>
				</select> </span>

			<span><select id="shi" style="width:100px;">
					<option>
						请选择市
					</option>
				</select> </span>
			<span><select id="xian" style="width:100px;">
					<option>
						请选择市
					</option>
				</select> </span>

		</div>
	</body>

//脚本
   <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("city1.xml");
  return xmlDoc;
}
 window.onload=function(){
     var xmlDoc=getXmlDoc();
     //获取根节点 
     var root=xmlDoc.documentElement;
     //获取所有的省节点
     var provinces=root.childNodes;
     //获取页面的span下拉列表的对象
     var sheng=document.getElementById("sheng");
     var shi=document.getElementById("shi");
     var xian=document.getElementById("xian");
     //alert("省节点循环进入");
     //加载所有的省节点
    for(var i=0;i<provinces.length;i++){//alert("省节点循环进入");
    	 //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 ){//alert("判断是否过滤了文本");
        	 //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);      
          }
           
       }
       //当某个省份被选选中是
     sheng.onchange=function(){
        //获取该省节点所有对象的集合 
        var shengs=sheng.options;
        var num=shengs.selectedIndex;
            //清空select列表
        shi.length=1;
        xian.length=1;
        //获取省份所对应的value值，根据值剧的到xml中相应节点
        var ppostcode=shengs[num].getAttribute("value");
    
        //遍历所有的省
        for(var i=0;i<provinces.length;i++){
         
          if(provinces[i].nodeType==1){ 
          var postcode=provinces[i].getAttribute("postcode");
            if(postcode==ppostcode){ 
           
            var cities=provinces[i].childNodes;
            
            shi.length=1;
            
            for(var j=0;j<cities.length;j++){
              if(cities[j].nodeType==1){
                var shiopt = document.createElement("option");
	    	    shiopt.appendChild(document.createTextNode(cities[j].getAttribute("name")));
	            shiopt.setAttribute("value",cities[j].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=1;
    			   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>
//xml

<?xml version="1.0" encoding="UTF-8"?>
<root name="中国">

  <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="新疆维吾尔自治区" postcode="650000" >
    <city name="乌鲁木齐市" postcode="650100" >
        <area name="天山区" postcode="650102" />
        <area name="沙依巴克区" postcode="650103" />
        <area name="新市区" postcode="650104" />
        <area name="水磨沟区" postcode="650105" />
        <area name="头屯河区" postcode="650106" />
        <area name="达坂城区" postcode="650107" />
        <area name="东山区" postcode="650108" />
        <area name="乌鲁木齐县" postcode="650121" />
    </city>
    <city name="克拉玛依市" postcode="650200" >
        <area name="独山子区" postcode="650202" />
        <area name="克拉玛依区" postcode="650203" />
        <area name="白碱滩区" postcode="650204" />
        <area name="乌尔禾区" postcode="650205" />
    </city>
    <city name="吐鲁番地区" postcode="652100" >
        <area name="吐鲁番市" postcode="652101" />
        <area name="鄯善县" postcode="652122" />
        <area name="托克逊县" postcode="652123" />
    </city>
    <city name="哈密地区" postcode="652200" >
        <area name="哈密市" postcode="652201" />
        <area name="巴里坤哈萨克自治县" postcode="652222" />
        <area name="伊吾县" postcode="652223" />
    </city>
    <city name="昌吉回族自治州" postcode="652300" >
        <area name="昌吉市" postcode="652301" />
        <area name="阜康市" postcode="652302" />
        <area name="米泉市" postcode="652303" />
        <area name="呼图壁县" postcode="652323" />
        <area name="玛纳斯县" postcode="652324" />
        <area name="奇台县" postcode="652325" />
        <area name="吉木萨尔县" postcode="652327" />
        <area name="木垒哈萨克自治县" postcode="652328" />
    </city>
    <city name="博尔塔拉蒙古自治州" postcode="652700" >
        <area name="博乐市" postcode="652701" />
        <area name="精河县" postcode="652722" />
        <area name="温泉县" postcode="652723" />
    </city>
    <city name="巴音郭楞蒙古自治州" postcode="652800" >
        <area name="库尔勒市" postcode="652801" />
        <area name="轮台县" postcode="652822" />
        <area name="尉犁县" postcode="652823" />
        <area name="若羌县" postcode="652824" />
        <area name="且末县" postcode="652825" />
        <area name="焉耆回族自治县" postcode="652826" />
        <area name="和静县" postcode="652827" />
        <area name="和硕县" postcode="652828" />
        <area name="博湖县" postcode="652829" />
    </city>
    <city name="阿克苏地区" postcode="652900" >
        <area name="阿克苏市" postcode="652901" />
        <area name="温宿县" postcode="652922" />
        <area name="库车县" postcode="652923" />
        <area name="沙雅县" postcode="652924" />
        <area name="新和县" postcode="652925" />
        <area name="拜城县" postcode="652926" />
        <area name="乌什县" postcode="652927" />
        <area name="阿瓦提县" postcode="652928" />
        <area name="柯坪县" postcode="652929" />
    </city>
    <city name="克孜勒苏柯尔克孜自治州" postcode="653000" >
        <area name="阿图什市" postcode="653001" />
        <area name="阿克陶县" postcode="653022" />
        <area name="阿合奇县" postcode="653023" />
        <area name="乌恰县" postcode="653024" />
    </city>
    <city name="喀什地区" postcode="653100" >
        <area name="喀什市" postcode="653101" />
        <area name="疏附县" postcode="653121" />
        <area name="疏勒县" postcode="653122" />
        <area name="英吉沙县" postcode="653123" />
        <area name="泽普县" postcode="653124" />
        <area name="莎车县" postcode="653125" />
        <area name="叶城县" postcode="653126" />
        <area name="麦盖提县" postcode="653127" />
        <area name="岳普湖县" postcode="653128" />
        <area name="伽师县" postcode="653129" />
        <area name="巴楚县" postcode="653130" />
        <area name="塔什库尔干塔吉克自治县" postcode="653131" />
    </city>
    <city name="和田地区" postcode="653200" >
        <area name="和田市" postcode="653201" />
        <area name="和田县" postcode="653221" />
        <area name="墨玉县" postcode="653222" />
        <area name="皮山县" postcode="653223" />
        <area name="洛浦县" postcode="653224" />
        <area name="策勒县" postcode="653225" />
        <area name="于田县" postcode="653226" />
        <area name="民丰县" postcode="653227" />
    </city>
    <city name="伊犁哈萨克自治州" postcode="654000" >
        <area name="伊宁市" postcode="654002" />
        <area name="奎屯市" postcode="654003" />
        <area name="伊宁县" postcode="654021" />
        <area name="察布查尔锡伯自治县" postcode="654022" />
        <area name="霍城县" postcode="654023" />
        <area name="巩留县" postcode="654024" />
        <area name="新源县" postcode="654025" />
        <area name="昭苏县" postcode="654026" />
        <area name="特克斯县" postcode="654027" />
        <area name="尼勒克县" postcode="654028" />
    </city>
    <city name="塔城地区" postcode="654200" >
        <area name="塔城市" postcode="654201" />
        <area name="乌苏市" postcode="654202" />
        <area name="额敏县" postcode="654221" />
        <area name="沙湾县" postcode="654223" />
        <area name="托里县" postcode="654224" />
        <area name="裕民县" postcode="654225" />
        <area name="和布克赛尔蒙古自治县" postcode="654226" />
    </city>
    <city name="阿勒泰地区" postcode="654300" >
        <area name="阿勒泰市" postcode="654301" />
        <area name="布尔津县" postcode="654321" />
        <area name="富蕴县" postcode="654322" />
        <area name="福海县" postcode="654323" />
        <area name="哈巴河县" postcode="654324" />
        <area name="青河县" postcode="654325" />
        <area name="吉木乃县" postcode="654326" />
    </city>
    <city name="省直辖行政单位" postcode="659000" >
        <area name="石河子市" postcode="659001" />
        <area name="阿拉尔市" postcode="659002" />
        <area name="图木舒克市" postcode="659003" />
        <area name="五家渠市" postcode="659004" />
    </city>
  </province>
</root>


 

<!--EndFragment-->
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