如何根据另一个dropdownList dynamiclly将项添加到dropdownList？ [英] how to add item to dropdownList according to another dropdownList dynamiclly?

问题描述

我的网站上有2个下拉列表。

ddlist_1在加载页面时从数据库中提供项目。

我希望当选择的索引时ddlist_1已更改，ddlist_2从数据库获取项目。（Asp.net&C＃）

Hi, I have 2 dropdown list in my website.
The ddlist_1 give Items from database at the time of loading page.
I want when the selected index of ddlist_1 changed, ddlist_2 get Item from database.(Asp.net & C#)

推荐答案

按照以下步骤操作 -

1.确保以下是为 ddlist_1 设置的

Follow these steps-
1. Make sure that following is set for ddlist_1

AutoPostBack="True"

2。在 SelectedIndexChanged 中为 ddllist_1 编写代码以绑定 ddlist_2

2. In SelectedIndexChanged for ddllist_1 write the code to bind ddlist_2

protected void ddllist_1_SelectedIndexChanged(object sender, EventArgs e)
{
    string selectedValue = ddllist_1.SelectedValue.ToString();
    //do the rest coding for binding ddllist_2
    //you have ddllist_1 selected value to filter if you need
}

希望，它有帮助：）

Hope, it helps :)

这是级联下拉菜单。



请参阅此内容，

http：//www.aspsnippets .com / Articles / Creating-Cascading-DropDownLists-in-ASP.Net.aspx [ ^ ]

http://www.ajaxcontroltoolkit.com/CascadingDropDown/CascadingDropDown.aspx [ ^ ]

http://www.asp.net/web-forms/overview/ajax-control-toolkit/cascadingdropdown/using-cascadingdropdown-with-a- database-cs [ ^ ]



-KR

That's cascading dropdowns.

Refer this,
http://www.aspsnippets.com/Articles/Creating-Cascading-DropDownLists-in-ASP.Net.aspx[^]
http://www.ajaxcontroltoolkit.com/CascadingDropDown/CascadingDropDown.aspx[^]
http://www.asp.net/web-forms/overview/ajax-control-toolkit/cascadingdropdown/using-cascadingdropdown-with-a-database-cs[^]

-KR

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