下拉数据加载&事件解雇 [英] dropdown data loading & event firing

问题描述

亲爱的，



我面临的问题如下所述：

我在asp.net页面有两个下拉控件。

第二次加载基于第一次下拉，当第一个只有一个数据时它没有被触发而第二个没有加载。

我试过第一次修复项目--select--。现在它的工作，但需要appenddatabounditem true。

这个原因问题，就像第一次下拉2数据，如果我选择第一个数据，第二个下拉数据加载，然后第二个数据第一个下拉选择然后它不会清除以前的data.i已经尝试过items.clear这一个但结果是一样的。



请你能帮助任何人找出来一个方法。



N：B：如果需要更多澄清问题请评论。



谢谢提前

Mahmud

Dear,

I am facing problem as follows describes bellow,
I have two drop-down control in asp.net page.
2nd one load based on first drop-down,when first one have only one data it is not fired & 2nd one not loaded.
I have tried first one fixed a item "--select--". now it''s work but need appenddatabounditem true.
This cause problem,like when first drop-down 2 data,if i select first data,data loaded in 2nd drop-down,then 2nd data in first drop-down select then it will not clear previous data.i have tried items.clear this one but result is same.

Please can u help anyone to find out a way.

N:B: if needed more clarification in problem please comments.

Thanks in Advance
Mahmud

推荐答案

尝试清除项目并重新重新绑定。

在 SelectedIndexChanged中第一个 DropDownList 事件清除 DropDownList2 的项目并重新绑定。试试这个：

Try clearing the items and rebind it again.
In the SelectedIndexChanged event of first DropDownList clear the items of DropDownList2 and rebind that. Try this:

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
    if(DropDownList2.Item.Count > 0)
        DropDownList2.Items.Clear(); 
    //Now bind the data again to DropDownList2
}

希望它有所帮助！

--Amit

Hope it helps!
--Amit

试试

http://csharpdotnetfreak.blogspot.in/2009/03/ populate-dropdown-based-selection-other.html [ ^ ]

https：// www .obout.com / Interface / aspnet_integration_cascading.aspx [ ^ ]

http://www.aspdotnet-suresh.com/2011/01/introduct ion-here-i-will-explain-how-to.html [ ^ ]

Try
http://csharpdotnetfreak.blogspot.in/2009/03/populate-dropdown-based-selection-other.html[^]
https://www.obout.com/Interface/aspnet_integration_cascading.aspx[^]
http://www.aspdotnet-suresh.com/2011/01/introduction-here-i-will-explain-how-to.html[^]

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