area.js

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var areaArray = new Array();

areaArray[0]=new Array('A00009','0','河南');
areaArray[1]=new Array('A00011','0','山东');

areaArray[2]=new Array('A00042','A00009','sdfasdfasdf');


 function CLASS_LIANDONG_YAO(array) 
  { 
   //数组，联动的数据源 
      this.array=array;  
      this.indexName=''; 
      this.obj=''; 
      //设置子SELECT 
    // 参数：当前onchange的SELECT ID，要设置的SELECT ID 
      this.subSelectChange=function(selectName1,selectName2) 
      { 
      //try 
      //{ 
    var obj1=document.all[selectName1]; 
    var obj2=document.all[selectName2]; 
    var objName=this.toString(); 
    var me=this; 
    var initArray = new Array();
    for(var i=2;i<this.subSelectChange.arguments.length;i++){
    		initArray[i-2] = this.subSelectChange.arguments[i];
    }
    obj1.onchange=function(){          
        me.optionChange(this.options[this.selectedIndex].value,obj2.id);
        for(var i=0;i<initArray.length;i++){
    			var initObj = document.all[initArray[i]];
        	initObj.length=0; 
    			initObj.options[0]=new Option("请选择",''); 
        }
    } 

      } 
      //设置第一个SELECT 
    // 参数：indexName指选中项,selectName指select的ID 
      this.firstSelectChange=function(indexName,selectName)   
      { 
      this.obj=document.all[selectName]; 
      this.indexName=indexName; 
      this.optionChange(this.indexName,this.obj.id) 

      } 
   
  	// indexName指选中项,selectName指select的ID 
		this.optionChange=function (indexName,selectName){ 
	    var obj1=document.all[selectName]; 
	    var me=this; 
	    obj1.length=0; 
	    obj1.options[0]=new Option("请选择",''); 
	    for(var i=0;i<this.array.length;i++){
	        if(this.array[i][1]==indexName){ 
	      		obj1.options[obj1.length]=new Option(this.array[i][2],this.array[i][0]); 
	        } 
	    } 
	   }
  }
  //这是调用代码 
  var S_liandong = new CLASS_LIANDONG_YAO(areaArray); //设置数据源 
  var S_AreaSelect = new Array();
  document.writeln("<SELECT ID=\"s_Option_Selct0\" NAME=\"s_Option_Selct0\"><OPTION selected>请选择</OPTION></SELECT>");
  S_AreaSelect[0] = "s_Option_Selct0";

	S_AreaSelect[1] = "s_Option_Selct1";
	document.writeln("<SELECT ID=\"s_Option_Selct1\" NAME=\"s_Option_Selct1\"><OPTION selected>请选择</OPTION></SELECT>");  	

function initSelectOpt(){
		
  S_liandong.firstSelectChange("0","s_Option_Selct0"); //设置第一个选择框

	S_liandong.subSelectChange("s_Option_Selct0","s_Option_Selct1"); //设置子级选择框 

}
function checkOneSelectOpt(obj){//检查选择框是否输入了对应的值
	if(obj.value==""){
		if(obj.length<=1){
			return 0;
		}else
			return 1;
	}else{
		return 0;
	}
}

function checkSelectOpt(obj){
	setSelectRecValue();
if(checkOneSelectOpt(document.getElementById("s_Option_Selct0"))==0 && checkOneSelectOpt(document.getElementById("s_Option_Selct1"))==0){
		return 0;
	}else{
		return 1;
	}
}
var s_ValueRecObj;
function setSelectRecObj(obj){
	s_ValueRecObj = document.getElementById(obj);
}

//设置最终的值
function setSelectRecValue(){
	for(var i=S_AreaSelect.length;i>0;i--){//倒着找
		var loObj = document.getElementById(S_AreaSelect[i-1]);		
		if(loObj!=null && loObj.length>1){
			s_ValueRecObj.value = loObj.value;
			break;
		}		
	}	
}
//获取当前选择的值(允许不全部选择)
function getSelectCurValue(){
	var lsResult = "";
	for(var i=S_AreaSelect.length;i>0;i--){//倒着找
		var loObj = document.getElementById(S_AreaSelect[i-1]);		
		if(loObj!=null && loObj.length>1 && loObj.value!=""){
			lsResult = loObj.value;
			break;
		}		
	}
	return lsResult;
}
//获取当前选择的值(必须选择最低一级)
function getMustSelectValue(){
	var lsResult = "";
	for(var i=S_AreaSelect.length;i>0;i--){//倒着找
		var loObj = document.getElementById(S_AreaSelect[i-1]);		
		if(loObj!=null && loObj.length>1){
			lsResult = loObj.value;
			break;
		}		
	}
	return lsResult;
}

function initSelectDataList(iIndex,strParentValue,strDefaultValue){
	var loTargetSelect = document.getElementById("s_Option_Selct"+(iIndex-1));
	if(loTargetSelect==null) return;
	loTargetSelect.length=0; 
	loTargetSelect.options[0]=new Option("请选择",''); 
	for(var i=0;i<areaArray.length;i++){
		if(areaArray[i][1]==strParentValue){//同一个父级
			loTargetSelect.options[loTargetSelect.length]=new Option(areaArray[i][2],areaArray[i][0]); 
			if(areaArray[i][0]==strDefaultValue){
				loTargetSelect.options[loTargetSelect.length-1].selected = true;
			}
		}
	}	
	if(strParentValue=="0"){//顶级，不需要再迭代		
	}else{		
		initSelectDataList(iIndex-1,getSelctParentId(strParentValue),strParentValue);//继续上一个SELECT框的初始化
	}
}
function getSelctParentId(strValue){	
	var strParentValue = "";
	//查出其上级的VALUE，然后设置
	for(var i=0;i<areaArray.length;i++){
		if(areaArray[i][0]==strValue){
			strParentValue = areaArray[i][1];
			break;
		}
	}
	return strParentValue;
}
function getSelectValueIndex(strValue,iLayer){	
	var iReturnLayer = -1;
	for(var i=0;i<areaArray.length;i++){
		if(areaArray[i][0]==strValue){
			iReturnLayer = 1;
			if(areaArray[i][1]=="0"){
				iLayer = 1;
			}else{
				iLayer = getSelectValueIndex(areaArray[i][1],iLayer+1) + 1;
			}
			break;
		}else{
			
		}
	}
	if(iReturnLayer<0) return -1;
	return iLayer;
}
function setCurSelectValue(strValue){
	if(strValue==""){//没有选择任何值，就使用默认的初始化
		return;
	}
	//初始化
	var iCurIndex = getSelectValueIndex(strValue,1);
	if(iCurIndex<0) return;
	initSelectDataList(iCurIndex,getSelctParentId(strValue),strValue);
	//同时需要设置最后一个选择项的下一级
	if(iCurIndex<S_AreaSelect.length){//还有下一级
		initSelectDataList(iCurIndex+1,strValue,"");
	}
}
initSelectOpt();