省份,城市，區(qū)縣數(shù)據(jù)結(jié)構(gòu)：【名稱，父類ID,當(dāng)前ID】

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

根據(jù)selectedIndex取得下一級關(guān)聯(lián)菜單的父類ID,
復(fù)制代碼 代碼如下:
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('==請選擇==','');
document.getElementById("dlmc0").options[0] = new Option('==請選擇==','');

//alert(locationid);
var locationid=locationid;
var i;
document.editForm.smalllocation.options[0] = new Option('==請選擇==','');
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]);
}
}
}

JavaScript技術(shù)：javawscript 三級菜單的實(shí)現(xiàn)原理，轉(zhuǎn)載需保留來源！

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