HTML&中的组合框处理javascript页面 [英] Combo box handling in HTML & javascript page

问题描述

亲爱的朋友，

我正在处理HTML-Javascript网页.在这里，我有3个组合框:

Dear Friends,

I am dealing with a HTML-Javascript web page. Here I have 3 combo boxes as:

<table><tbody><tr><td><select id="prod1"  runat="server"/></td></tr></tbody></table>
<table><tbody><tr><td><select id="prod2"  runat="server"/></td></tr></tbody></table>
<table><tbody><tr><td><select id="prod3"  runat="server"/></td></tr></tbody></table>

这些组合框由返回2个产品的SQL语句填充:
台式风扇
排气扇

现在的要求是，如果我在prod1中选择台式风扇"，则prod2组合框应仅向我显示Exhaist Fan，因此最终prod3不应为我提供任何价值.使用ASP.Net控件很容易做到，但要求在javascript中.请帮忙.

提前谢谢您.

IB

These combo boxes are populated by an SQL statement which returns 2 products:
Table Fan
Exhaust Fan

Now the requirement is if I select Table Fan in prod1, prod2 combo box should only show me Exhaist Fan so eventually prod3 should not offer me any value. With ASP.Net controls its easy to do but the requirement is in javascript. Please help.

Thanking you in advance.

IB

推荐答案

也许有帮助吗? :

maybe this help ? :

function AddItem(Text,Value)
    {
        // Create an Option object
        var opt = document.createElement("option");
        // Add an Option object to Drop Down/List Box
        document.getElementById("DropDownList").options.add(opt);
        // Assign text and value to Option object
        opt.text = Text;
        opt.value = Value;
    }

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