织梦cms同一页面调用多个相同的js联动菜单的方法

<!--

//选择地区的二级分类(非通用调用)
function selNext(oj, v)
{
var newobj = oj.options;
var selv = parseInt(v);
var maxv = parseInt(v) + 500;
while(newobj.length > 0) {
oj.remove(0);
}
clear(oj);
if(selv==0)
{
aOption = document.createElement('OPTION');
aOption.text = '具体地区';
aOption.value = '0';
oj.options.add(aOption);
return;
}
else
{
aOption = document.createElement('OPTION');
aOption.text = '具体地区';
aOption.value = '0';
oj.options.add(aOption);
}
var str = '';
for(i=selv+1; i < maxv; i++)
{
if(!em_nativeplaces[i]) continue;
aOption = document.createElement('OPTION');
aOption.text = em_nativeplaces[i];
aOption.value = i;
oj.options.add(aOption);
}
}


//子类改变事件
function ChangeSon()
{
/*
var emname = this.name.replace('_son', '');
var topSelObj = document.getElementById(emname+'_top');
if(this.options[this.selectedIndex].value==0) {
document.getElementById('hidden_'+emname).value = topSelObj.options[topSelObj.selectedIndex].value;
}
else {
document.getElementById('hidden_'+emname).value = this.options[this.selectedIndex].value;
}
*/
// 由于支持3级联动,所以这里需要对自己改变进行重构
var emname = this.name.replace('_son', '');
// alert(emname);
if( document.getElementById(idname+'_sec') )
{
var oj = document.getElementById(idname + '_sec');
}
else
{
var oj = document.createElement('select');
oj.name = emname + '_sec';
oj.id = idname + '_sec';
oj.onchange = ChangeSec;
}
var v = this.options[this.selectedIndex].value;
document.getElementById('hidden_'+idname).value = v;
var newobj = oj.options;
var selarr = eval('em_'+emname+'s');

var selv = parseInt(v);
var maxv = parseInt(v) + 0.5;
// alert(maxv);
i = 0;
while(newobj && newobj.length > 0) oj.remove(0);
clear(oj);
if(selv == 0)
{
aOption = document.createElement('OPTION');
aOption.text = '请选择..';
aOption.value = '0';
oj.options.add(aOption);
return;
}
else
{
aOption = document.createElement('OPTION');
aOption.text = '请选择..';
aOption.value = '0';
oj.options.add(aOption);
}
var str = '';
var j=0;
for(i = selv + 0.001; i < maxv; i = FloatAdd(i, 0.001))
{
if(!selarr[i]) continue;
aOption = document.createElement('OPTION');
aOption.text = selarr[i];
aOption.value = i;
oj.options.add(aOption);
j++;
}
if(j > 0) document.getElementById('span_'+idname+'_sec').appendChild(oj);
else document.getElementById('span_'+idname+'_sec').innerHTML = "";
}

// 改变第三级的事件
function ChangeSec()
{
var emname = this.name.replace('_sec', '');
var topSelObj = document.getElementById(idname+'_top');
if(this.options[this.selectedIndex].value==0) {
document.getElementById('hidden_'+idname).value = topSelObj.options[topSelObj.selectedIndex].value;
}
else {
document.getElementById('hidden_'+idname).value = this.options[this.selectedIndex].value;
}
}

//顶级类改变事件
function selNextSon()
{
var emname = this.name.replace('_top', '');
var idname = this.id.replace('_top', '');
if( document.getElementById(idname+'_son') )
{
var oj = document.getElementById(idname + '_son');
}
else
{
var oj = document.createElement('select');
oj.name = emname + '_son';
oj.id = idname + '_son';
oj.onchange = ChangeSon;
}
var v = this.options[this.selectedIndex].value;
document.getElementById('hidden_'+idname).value = v;
var newobj = oj.options;
var selarr = eval('em_'+emname+'s');
var selv = parseInt(v);
var maxv = parseInt(v) + 500;
while(newobj && newobj.length > 0) oj.remove(0);
clear(oj);
if(selv==0)
{
aOption = document.createElement('OPTION');
aOption.text = '请选择..';
aOption.value = '0';
oj.options.add(aOption);
return;
}
else
{
aOption = document.createElement('OPTION');
aOption.text = '请选择..';
aOption.value = '0';
oj.options.add(aOption);
}
var str = '';
for(i=selv+1; i < maxv; i++)
{
if(!selarr[i]) continue;
aOption = document.createElement('OPTION');
aOption.text = selarr[i];
aOption.value = i;
oj.options.add(aOption);
}
document.getElementById('span_'+idname+'_son').appendChild(oj);
}


// 根据数组生成多级联动菜单
function MakeTopSelect(emname,idname, selvalue)
{
var selectFormHtml = '';
var aOption = null;
var selObj = document.createElement("select");
selObj.name = emname + '_top';
selObj.id = idname + '_top';
selObj.onchange = selNextSon;
var selarr = eval('em_'+emname+'s');
// alert(selarr[1002.2]);
var topvalue = 0;
var sonvalue = 0;
var secvalue = 0;

aOption = document.createElement('OPTION');
aOption.text = '请选择..';
aOption.value = 0;
selObj.options.add(aOption);

// alert(selvalue);
if(selvalue % 500 == 0 )
{
topvalue = selvalue;
}
// 如果是小数,则依次取出顶级数值,二级数值以及三级数值
else if(!!(selvalue % 1))
{
secvalue = selvalue;
sonvalue = Math.floor(selvalue);
topvalue = sonvalue - (sonvalue % 500);
// alert(secvalue);
}
else {
sonvalue = selvalue;
topvalue = selvalue - (selvalue % 500);
}

for(i = 500; i <= selarr.length; i += 500)
{
if(!selarr[i]) continue;
aOption = document.createElement('OPTION');
if(i == topvalue) {
aOption = document.createElement('OPTION');
aOption.text = selarr[i];
aOption.value = i;
selObj.options.add(aOption);
aOption.selected = true;
}
else {
aOption = document.createElement('OPTION');
aOption.text = selarr[i];
aOption.value = i;
selObj.options.add(aOption);
}
}
document.getElementById('span_'+idname).appendChild(selObj);

//如果子类存在值，创建子类
//if(sonvalue > 0 || topvalue > 0) {
selObj = document.createElement("select");
selObj.name = emname + '_son';
selObj.id = idname + '_son';
selObj.onchange = ChangeSon;
aOption = document.createElement('OPTION');
aOption.text = '请选择..';
aOption.value = 0;
selObj.options.add(aOption);

//当大类有值输出子类
if(topvalue > 0)
{
var selv = topvalue;
var maxv = parseInt(topvalue) + 500;
for(i = selv + 1; i < maxv; i++)
{
if(!selarr[i]) continue;
aOption = document.createElement('OPTION');
if(i == sonvalue) {
aOption = document.createElement('OPTION');
aOption.text = selarr[i];
aOption.value = i;
selObj.options.add(aOption);
aOption.selected = true;
}
else {
aOption = document.createElement('OPTION');
aOption.text = selarr[i];
aOption.value = i;
selObj.options.add(aOption);
}
}
}
document.getElementById('span_'+idname+'_son').appendChild(selObj);

// 若存在第三级则创建
if(secvalue > 0)
{
selObj = document.createElement("select");
selObj.name = emname + '_sec';
selObj.id = idname + '_sec';
selObj.onchange = ChangeSec;
aOption = document.createElement('OPTION');
aOption.text = '请选择..';
aOption.value = 0;
selObj.options.add(aOption);

var selv = sonvalue;
var maxv = parseInt(sonvalue) + 0.5;
// alert(maxv);
i = 0;
for(i = selv + 0.001; i < maxv; i = FloatAdd(i, 0.001))
{
if(!selarr[i]) continue;
aOption = document.createElement('OPTION');
if(i == secvalue) {
aOption = document.createElement('OPTION');
aOption.text = selarr[i];
aOption.value = i;
selObj.options.add(aOption);
aOption.selected = true;
}
else {
aOption = document.createElement('OPTION');
aOption.text = selarr[i];
aOption.value = i;
selObj.options.add(aOption);
}
}
}
document.getElementById('span_'+idname+'_sec').appendChild(selObj);
}

// 两个小数相加进度计算
function FloatAdd(arg1, arg2)
{
var r1,r2,m;
try{r1=arg1.toString().split(".")[1].length}catch(e){r1=0}
try{r2=arg2.toString().split(".")[1].length}catch(e){r2=0}
m=Math.pow(10,Math.max(r1,r2))
return (arg1*m+arg2*m)/m
}

//清除旧对象
function clear(o)
{
l=o.length;
for (i = 0; i< l; i++){
o.options[1]=null;
}
}
-->

<script language="javascript" type="text/javascript" src="你自定义的js文件目录"></script>

<script language="javascript" type="text/javascript">MakeTopSelect("MyArea","IdName", 0);</script>