非常简单的二级联动js菜单 [收藏]

最新推荐文章于 2021-06-03 22:42:20 发布

转载最新推荐文章于 2021-06-03 22:42:20 发布 · 1.6k 阅读

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#function #javascript #div #hp

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本文介绍了一个简单的二级联动菜单实现方案，通过JavaScript动态创建下拉菜单并根据用户选择更新子菜单选项，适用于网页导航等场景。

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<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>
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