前面我讲了普通的无限联动下拉框，但是，如果要指定select呢？这就要用下面这个联动下拉框类了。
由于要指定select，所以，前面的容器不需要了，我们用个数组把指定的select保存，另外，所用数据的结构稍有变化，多了个深度项，无限分类中每项肯定是有个深度的。
所用数据sortArr.js如下：
var arrSorts = new Array(35);
arrSorts[0] = ["1", "主类别一", "0", "1"];
arrSorts[1] = ["2", "主类别二", "0", "1"];
arrSorts[2] = ["3", "主类别三", "0", "1"];
arrSorts[3] = ["4", "小类一", "1", "2"];
arrSorts[4] = ["5", "小类二", "1", "2"];
arrSorts[5] = ["6", "小类三", "1", "2"];
arrSorts[6] = ["7", "细类一", "4", "3"];
arrSorts[7] = ["8", "细类二", "4", "3"];
arrSorts[8] = ["9", "细类三", "4", "3"];
arrSorts[9] = ["10", "小类四", "2", "2"];
arrSorts[10] = ["11", "小类五", "2", "2"];
arrSorts[11] = ["12", "小类六", "2", "2"];
arrSorts[12] = ["13", "细类四", "5", "3"];
arrSorts[13] = ["14", "细类五", "5", "3"];
arrSorts[14] = ["15", "末类一", "7", "4"];
arrSorts[15] = ["16", "末类二", "7", "4"];
arrSorts[16] = ["17", "末类三", "7", "4"];
arrSorts[17] = ["18", "终极类一", "15", "5"];
arrSorts[18] = ["19", "终极类二", "15", "5"];
arrSorts[19] = ["20", "终极类三", "15", "5"];
arrSorts[20] = ["21", "终极类四", "16", "5"];
arrSorts[21] = ["22", "终极类五", "16", "5"];
arrSorts[22] = ["23", "终极类六", "16", "5"];
arrSorts[23] = ["24", "末类四", "8", "4"];
arrSorts[24] = ["25", "末类五", "8", "4"];
arrSorts[25] = ["26", "末类六", "8", "4"];
arrSorts[26] = ["27", "末类七", "9", "4"];
arrSorts[27] = ["28", "末类八", "9", "4"];
arrSorts[28] = ["29", "末类九", "9", "4"];
arrSorts[29] = ["30", "终极类七", "17", "5"];
arrSorts[30] = ["31", "终极类八", "17", "5"];
arrSorts[31] = ["32", "终极类九", "17", "5"];
arrSorts[32] = ["33", "终极类十", "24", "5"];
arrSorts[33] = ["34", "终极类十一", "24", "5"];
arrSorts[34] = ["35", "终极类十二", "24", "5"];
arrSorts[35] = ["36", "终极类十三", "24", "5"];
select用数组存放，为selectArr.js：
var selectArr=new Array();
selectArr.push("test1");
selectArr.push("test2");
selectArr.push("test3");
selectArr.push("test4");
selectArr.push("test5");
var selectArr2=new Array();
selectArr2.push("test6");
selectArr2.push("test7");
selectArr2.push("test8");
selectArr2.push("test9");
//selectArr2.push("test10");
然后，就是主要联动处理类sort.js了：
/**
* 无限级联动选择菜单类
* _storeValueObjName:存放选择项值的页面元素名称
* _showSelectObjName:显示该菜单的页面元素名称
* _sortArr:显示菜单所需的数组，格式如下
* arrSorts[0] = ["类别ID1", "类别一", "父类ID1", "深度1"];
* arrSorts[1] = ["类别ID2", "类别二", "父类ID2", "深度2"];
*
* @author zxub 2005-8-23
*/
function sortMenu(_storeValueObjName, _sortArr, _selectArr)
{
this.storeValueObj=document.getElementById(_storeValueObjName);
this.sortArr=_sortArr;
this.selectArr=_selectArr;
this.maxDepth=_selectArr.length;
/**
* 获取第一层分类，并显示在showSelectObj中
* _sortMenuObj:sortMenu的实例对象，指向自己
*/
this.initSorts=function(_sortMenuObj)
{
for (i=1;i<this.maxDepth;i++)
{
document.getElementById(this.selectArr[i]).style.display="none";
}
this.storeValueObj.value=0;
_select=document.getElementById(this.selectArr[0]);
_select.sortMenuObj=_sortMenuObj;
_select.onchange=function()
{
this.sortMenuObj.setSorts(this,this.sortMenuObj);
}
_select.add(new Option("请选择...",""));
for (var i = 0; i < this.sortArr.length; i++)
{
if (this.sortArr[i][2] == 0)
{
_select.add(new Option(this.sortArr[i][1],this.sortArr[i][0]));
}
}
_select.depth=1;
}
this.getSelectIndex=function(_selectName)
{
_index=null;
for (i=0;i<this.maxDepth;i++)
{
if (this.selectArr[i]==_selectName)
{
_index=i;
break;
}
}
return _index;
}
/**
* 下拉框联动
* _curSelect:当前选择的下拉框
* _sortMenuObj:sortMenu的实例对象，指向自己
*/
this.setSorts=function(_curSelect,_sortMenuObj)
{
//若当前下拉框后面还有下拉框，即有下级下拉框时，清除下级下拉框，在后面会重新生成下级部分
for (i=_curSelect.depth;i<this.maxDepth;i++)
{
_select=document.getElementById(this.selectArr[i]);
while(_select.length>0)
_select.remove(0);
_select.style.display="none";
}
//获取当前选项的值
_iValue = _curSelect.options[_curSelect.selectedIndex].value;
//如果选择的是下拉框第一项(第一项的值为"")
if (_iValue == "")
{
//若存在上级下拉框
if (_curSelect.depth>1)
{
_parent=document.getElementById(this.selectArr[_curSelect.depth-2]);
//取值为上级下拉框选中值
this.storeValueObj.value = _parent.options[_parent.selectedIndex].value;
}
else
{
//没上级则取值为0
this.storeValueObj.value = 0;
}
//选择第一项(请选择...),没有下级选项,所以要返回
return false;
}
//选择的不是第一项
this.storeValueObj.value = _iValue;
if (_curSelect.depth==_sortMenuObj.maxDepth)
{
return false;
}
//去掉当前下拉框原来的选择状态
//将选中的选项对应代码更改为 selected
for (i=0;i<_curSelect.options.length;i++)
{
if (_curSelect.options[i].selected=="selected")
{
_curSelect.options[i].removeAttribute("selected");
}
if (_curSelect.options[i].value==_iValue)
{
_curSelect.options[i].selected="selected";
}
}
//新生成的下级下拉列表
_hasChild=false;
for (var i = 0; i < this.sortArr.length; i++)
{
if (this.sortArr[i][2] == _iValue)
{
if (_hasChild==false)
{
_siblingSelect=document.getElementById(this.selectArr[_curSelect.depth]);
_siblingSelect.sortMenuObj=_sortMenuObj;
_siblingSelect.style.display="";
_siblingSelect.depth=parseInt(_curSelect.depth)+1;
_siblingSelect.onchange=function()
{
this.sortMenuObj.setSorts(this,this.sortMenuObj);
}
_siblingSelect.add(new Option("请选择...",""));
_siblingSelect.add(new Option(this.sortArr[i][1],this.sortArr[i][0]));
_hasChild=true;
}
else
{
_siblingSelect.add(new Option(this.sortArr[i][1],this.sortArr[i][0]));
}
}
}
}
/**
* 根据最小类选取值生成整个联动菜单,由后往前递归完成
* _minCataValue:最小类的取值
* _sortMenuObj:sortMenu的实例对象，指向自己
*/
this.hideChildInNewInit=false;
this.newInit=function(_minCataValue,_sortMenuObj)
{
if (this.storeValueObj.value=="undefined" || this.storeValueObj.value=="")
{
this.storeValueObj.value=_minCataValue;
}
if (_minCataValue == 0)
{
//minCataValue为0，也就是初始化了
this.initSorts(_sortMenuObj);
//初始化完成后，退出函数
return false;
}
//父级ID
_parentID=null;
_depth=null;
for (var i = 0; i < this.sortArr.length; i++)
{
if (_minCataValue == this.sortArr[i][0])
{
_depth=this.sortArr[i][3];
_parentID = this.sortArr[i][2];
break;
}
}
if (!this.hideChildInNewInit)
{
for (i=_depth;i<this.maxDepth;i++)
{
document.getElementById(this.selectArr[i]).style.display="none";
}
this.hideChildInNewInit=true;
}
if (_depth>this.maxDepth)
{
alert("下拉框只能构成"+this.maxDepth+"级关系，而当前值处于第"+_depth+"级关系中!");
alert("初始化下拉框为原始状态");
this.initSorts(_sortMenuObj);
return false;
}
_select=document.getElementById(this.selectArr[_depth-1]);
_select.depth=_depth;
_select.sortMenuObj=_sortMenuObj;
_select.onchange=function()
{
this.sortMenuObj.setSorts(this,this.sortMenuObj);
}
_select.add(new Option("请选择...",""));
for (var i = 0; i < this.sortArr.length; i++)
{
if (this.sortArr[i][2] == _parentID)
{
if (this.sortArr[i][0] == _minCataValue)
{
_opt=new Option(this.sortArr[i][1],this.sortArr[i][0]);
_select.add(_opt);
_opt.selected="selected";
}
else
{
_select.add(new Option(this.sortArr[i][1],this.sortArr[i][0]));
}
}
}
if (_parentID > 0)
{
this.newInit(_parentID,_sortMenuObj);
}
}
}
最后是测试用页面test.htm：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script language="javascript" src="sortArr.js"></script>
<script language="javascript" src="selectArr.js"></script>
<script language="javascript" src="sort.js"></script>
</HEAD>
<BODY>
<select name=test1></select>
<select name=test2></select>
<select name=test3></select>
<select name=test4></select>
<select name=test5></select>
<input id=testValue name=testValue><br>
<select name=test6></select>
<select name=test7></select>
<select name=test8></select>
<select name=test9></select>
<!--<select name=test10></select>-->
<input id=testValue2 name=testValue2>
<script language="javascript">
var a=new sortMenu("testValue",arrSorts,selectArr);
a.initSorts(a);
var b=new sortMenu("testValue2",arrSorts,selectArr2);
b.newInit(7,b);
</script>
</BODY>
</HTML>
好了，可指定select的无限联动下拉框就到这里了，后面有select可编辑的这种联动，嘿嘿，下面见，闪～
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