动态创建下拉菜单

---摘自《ChinaAsp网络》（文/Taylor999）

<html>
<head>

<title>动态下拉菜单</title>
<style>
SELECT.smallSel
{
    BACKGROUND-COLOR: white;
    COLOR: #000080;
    FONT-SIZE: 9pt
}
</style>
<script language=javascript>
<!-- hide from old browsers...

/*     动态下拉菜单 -- written by Taylor Chen (Taylor999)
       如果您发现任何问题，请E-mail给我，Taylor@etang.com
*/


var info = new Array(
    "杂文*弥天大谎的背后|院士相当于副省级?|为教育打几个激灵|预算黑洞一例|官不贵，民不贱|省了麻烦|

轿车不如轿子说|这回确是个别|血和泪构成的笑话|给张艺谋松绑吧!",
    "生活随笔*木兰漂亮吗?|一张旧车票|酒味杂谈|时空隧道|最后捞一把",
    "文选*家庭也要有民主|“待遇”的联想|“农民”不是形容词|只多一点点",
    "读者*当代“士子”之悲|谈程序|厅长说与百姓说|其实很高明");

var infoA=new Array(
    "焦点话题*安徽：国企领导可以超龄任职|新世纪怎么花钱|武汉：企业将告别行政级别",
    "读者书屋*欲火",
    "品味园*破译“中国人之谜”不妨读读《闲话中国人》|请客吃饭乐无穷|走动走动向上浮动|文人也当谋富

|做并享受着———与白岩松笑谈摭拾|比谁写得厚",
    "环球采风*法国建成绿色学校|俄罗斯第一夫人温情谈恋史|法国人才外流有原因|德国电脑人才可破例|德

国慕尼黑啤酒节",
    "人物春秋*我所知道的胡乔木|自信些，迎接全球化|红与黑");
var mywork= new Array("",info,infoA);
/************************************************************************************************

******/

function stringSplit ( string, delimiter ) {
    if ( string == null || string == "" ) {
        return null;
    } else if ( string.split != null ) {
        return string.split ( delimiter );
    } else {
        var ar = new Array();
        var i = 0;
        var start = 0;
        while( start >= 0 && start < string.length ) {
             var end = string.indexOf ( delimiter, start ) ;
             if( end >= 0 ) {
                 ar[i++] = string.substring ( start, end );
                 start = end+1;
             } else {
                 ar[i++] = string.substring ( start, string.length );
                 start = -1;
             }
        }
        return ar;
    }
}
/************************************************************************************************

******/
var menu1 = new Array();
var menu2 = new Array();
/************************************************************************************************

******/
function createMenus ( wh ) {
    var infoname = new Array();
    infoname=mywork[wh];
    for ( var i=0; i < infoname.length; i++ ) {
        menu1[i] = stringSplit ( infoname[i], '*' );
        menu2[i] = stringSplit ( menu1[i][1], '|' );
    }

    var author = document.myForm.main;
    var book = document.myForm.title;

    author.length = infoname.length;
    book.length = menu2[0].length;
    for ( var i=0; i < infoname.length; i++ ) {
         author.options[i].value  = menu1[i][0];
         author.options[i].text   = menu1[i][0];
    }
    document.myForm.main.selected = 0;
    for (var x=0; x < menu2[0].length; x++) {
         book.options[x].text = menu2[0][x];
         book.options[x].value = menu2[0][x];
    }         
    document.myForm.title.selected = 0;
}

/************************************************************************************************

******/

function updateMenus ( what ) {
    var sel = what.selectedIndex;

    if ( sel >= 0 && sel < menu1.length )
        var temp = menu2[sel];
    else
        var temp = new Array ();
    
    what.form.title.length = temp.length;

    for ( var i = 0; i < temp.length; i++ ) {
        what.form.title.options[i].text  = temp[i];
        what.form.title.options[i].value = temp[i];
    }
    what.form.title.selected=0;
}
// end of hiding -->
</script>
</head>

<body background="" bgcolor="#ffffff" text="#400040" link="#ff0080" vlink="#ff8080"

alink="#ff0000">
<center><h1>动态下拉菜单</h1></center>

<form name=myForm action=test2.asp method=post><p>
分类:&nbsp;
<select name=my size=1 onchange="createMenus(document.myForm.my.selectedIndex)" class="smallsel">
<option selected></option>
<option value="info">杂文报</option>
<option value="infoA">书刊报</option>
</select>
<p>
作者: &nbsp;<select name="main" size=1 onChange="updateMenus(this)" class="smallsel">
<option>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp

;&nbsp;&nbsp;&nbsp;&nbsp;
<option>
<option>
</select>
<p>
标题:&nbsp;
<select name="title" size=1 class="smallsel">
<option>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp

;
<option>
<option>
</select>
<input type=button value=Submit onclick="parent.location.href='http://www.hebeidaily.com.cn'">
</form>
</body>
</html>