Drop down selected index change event not working properly

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Hi friend,

I have one user control UC1 which is register in another user control UC2.
In UC1 i have one drop down and i right onselectedindexchanged() event for same, but it is not raised when i change index of drop down.

<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
              </asp:DropDownList>

protected void DropDownList1_SelectedIndexChanged (object sender, EventArgs e) 
{
//some functionality
}

but this event fired when i click on button which is on UC2

plz tell me why this is happend?

Posted 20-Dec-10 3:49am

Pank's 1986

Updated 20-Dec-10 18:15pm

v2

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Brij 20-Dec-10 10:49am

Whether this dropdown is in some template?

Pank's 1986 21-Dec-10 0:03am

Hi Brij,
No it is in user control.

3 solutions

Solution 2

I can't say much reading yours description, but it looks like you need to set AutoPostBack property of DropDown to true.
This way page will make postback automatically when you change selected index.

In your case button clicking caused the page postback and then, if you changed selected index of your dropdown, DropDownList1_SelectedIndexChanged event if fired too.

If this is not a right solution, send yours markup and code so we can investigate whats happening.

Posted 20-Dec-10 4:18am

Martin Arapovic

Comments

Pank's 1986 21-Dec-10 0:11am

I already set AutoPostBack="true" for drop down.

Martin Arapovic 21-Dec-10 10:07am

Then something else is the problem, post controls code and page code where you are using them, then we can investigate whats happening. ;)

Pank's 1986 21-Dec-10 10:31am

Hey martin,
i found solution, i added one javascript onchange function on same drop down.
because of that it will happen.

Thanks for reply

Solution 3

Setting AutoPostBack property of DropDown will do for you.

Posted 20-Dec-10 5:37am

MrBatra

Comments

Pank's 1986 21-Dec-10 0:01am

I set AutoPostBack property true

MrBatra 21-Dec-10 9:02am

IS there any kind of error you're getting. Or Its just not working

Pank's 1986 21-Dec-10 10:32am

i found solution, i added one javascript onchange function on same drop down. because of that it will happen.
Now its working

Thanks

MrBatra 21-Dec-10 15:31pm

Good for you

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Imran Saiyed · Accepted Answer · 2010-12-20T22:02:00

Solution 4

When the autopostback is set True, after the page is rendered, a javascript is added on the onchange event of the dropdown (SELECT in HTML) to trigger the postback,

View the source after the page is rendered and check whether the javascript is getting added to the onchange event of the dropdown.

If you are adding some javascript on the onchange event of the dropdown in the code-behind, that might also stop the page to postback.

Posted 20-Dec-10 22:02pm

Imran Saiyed

Comments

Pank's 1986 21-Dec-10 10:30am

Thanks Imran I found solution, i added one javascript onchange function on same drop down.

Thanks Again

Imran Saiyed 21-Dec-10 10:37am

welcome :)

amitavin_Sharma 8-Apr-13 2:02am

please any one help me.....
i'm facing a problem
i used javascript methos to get dropdown list selected value named as "onchange" when i'm using this then SelectedIndexChanged Event not fired
plzzzzz help me