三级菜单的兑现原理

父类ID

省份: 请选择 山东省
城市: ==请选择==威海市德州市滨州市
区县: ==请选择乡镇==威海文登荣成乳山

省区,城市,区或县数据结构:【名称,父类ID,当前ID】

 onChange=”changelocation2(document.editForm.smalllocation.options[document.editForm.smalllocation.selectedIndex].value)”

听新闻说selectedIndex获得下一流关联菜单的父类ID,

复制代码 代码如下:

function changelocation(locationid)
{
document.editForm.smalllocation.length = 0;
// document.editForm.dlmc0.length = 0;
document.getElementById(“dlmc0”).length=0;
//document.editForm.dlmc0.options[0] = new Option(‘==请选择==’,”);
document.getElementById(“dlmc0″).options[0] = new
Option(‘==请选择==’,”);

//alert(locationid);
var locationid=locationid;
var i;
document.editForm.smalllocation.options[0] = new
Option(‘==请选择==’,”);
for (i=0;i < onecount; i++)
{
if (subcat[i][1] == locationid)
{
document.editForm.smalllocation.options[document.editForm.smalllocation.length]
= new Option(subcat[i][0], subcat[i][2]);
}
}
}