求js代码(列表框相关)

Question

google huo baidu
javascript 二级联动菜单

Answer 1

<TITLE>二级联动</TITLE>
<STYLE>
body { font-size: 11px; font-family: Verdana;background:#ececec;color:#666666;}
select { font-size: 11px; font-family: Verdana;vertical-align: middle;margin: 3px;background:#ececec;color:#666666;}
</STYLE>
<div id="tar"></div>
<SCRIPT LANGUAGE="JavaScript" DEFER>
var fMenu = ["上海","北京","广东","南京"]
var fValue = ["shanghai","beijing","guadong","nanjing"]
var sMenu = [["杨浦区","徐汇区","黄浦区","卢湾区"],["丰台区","宝定区"],["广州","深圳"],["雨花台"]]
var sValue = [["yp","xh","hp","lw"],["ft","bd"],["gz","sz"],["yht"]]var oWhere = document.all.tar;
var ofMenu = document.createElement("<SELECT name='main'>");
var osMenu = document.createElement("<SELECT name='sub'>");
with(oWhere)appendChild(ofMenu),appendChild(osMenu);createMainOptions();
createSubOptions(0);ofMenu.onchange = function() {createSubOptions(this.selectedIndex);};function createMainOptions() {
    for(var i=0;i<fMenu.length;i++)ofMenu.options[i] = new Option(fMenu[i],fValue[i]);
}
function createSubOptions(j) {
    with(osMenu) {
        length=0;
        for(var i=0;i<sMenu[j].length;i++)osMenu.options[i] = new Option(sMenu[j][i],sValue[j][i]);
    }
}
</SCRIPT>