如果使用AJAX更改了其他下拉索引，则填充下拉列表 [英] Fill Dropdown if other dropdown index changed using AJAX

问题描述

申请您可以让我获得宝贵的解决方案:

我有一个项目，我必须在其中填充DropDownList(数据库中的DDProjectIDList)，如果用户选择projectID，则必须填写相应的客户列表(DropDownList).这些所有数据都在sql数据库中.

我必须用AJAX来做.

感谢您的帮助
Shaan

Appriciate u can let me the precious solution :

I have a project in which i have to fill the DropDownList(DDProjectIDList from database), and if user select the projectID, then corresponding customer list(DropDownList) must be filled . These all data is there in the sql database.

I have to do it by AJAX.

Thanx for your help
Shaan

推荐答案

使用Google或使用代码项目搜索...
使用:级联下拉列表 + ASP.NET作为关键字...

您将获得大量的材料，代码和控制权！

Use Google or Use Code Project Search...
Use:Cascading Dropdown + ASP.NET as keywords...

you would get lots of material, code, control on it!

Shaan，

请按照步骤
1.将两个下拉菜单都放在UpdatePanel中.
2.为第一个下拉菜单添加onchange事件.
3.在事件处理程序中，填写第二个下拉列表(仅在服务器端以及其他任何下拉列表中).

Shaan,

Follow the steps
1. Place both the dropdowns in a UpdatePanel.
2. Add onchange event for the first dropdown.
3. In the event handler fill the second dropdown (on serverside only as do for any other).

Shaan
在这里，我根据国家更改了州..

在javascript中根据您的要求添加此..

Shaan
here i changed the state based on the country ..

in javascript add this.. based on ur requirement..

<code><pre lang="xml"><asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>

    <asp:DropDownList ID="ddlcountry" runat="server" AutoPostBack="True"
            onselectedindexchanged="ddlcountry_SelectedIndexChanged" >
    </asp:DropDownList>
        <br />
        <br />
    <br />
    <asp:DropDownList ID="ddlstate" runat="server"
            
            AutoPostBack="True" ></asp:DropDownList>

并在第一个代码库中添加绑定数据，例如在ddlcountry_SelectedIndexChanged事件中(我使用过LINQ)

and in codebahind jst add bind the data for example in ddlcountry_SelectedIndexChanged event(i have used LINQ)

IEnumerable<State> res = db.States.Where(s => s.CountryId ==int .Parse (ddlcountry.SelectedValue));<br />
ddlstate.DataSource = sl;<br />
        ddlstate.DataTextField = "StateName";<br />
        ddlstate.DataValueField = "StateId";<br />
        <br />
        ddlstate.DataBind();<br />
<br />

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