织梦同一页面调用多个相同的js联动菜单

<!--

//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;

}

}

-->

将上面代码保存为新的js文件，注意不要覆盖官方原来的，否则可能因为后续的多级联动菜单添加而反复修改文件

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

这句不多说

注意在页面的运行脚本中，原来的两个参数改成了三个，第一个是联动类型的英文名称，具体请在后台查看

第二个参数是你自定义的id，防止页面上出现重复id的现象，第三个参数是初始选项

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