ASP.NET dropdownlist selectedindex change firing for programmatic selection changes

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I have asp.net page with dynamic dropdown controls and I need only the

C#

selectedIndexchanged

event to fire only for the user selection.

At present

C#

selectedIndexchanged

event is firing for each programatically selection changes.

Can some one suggest how to check/fire the selectedIndexchanged event only the "User" selection?

Posted 16-Oct-12 9:21am

Milan Mathew

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2 solutions

Solution 1

If you are going to change the value programmatically, you can set a flag in your class that you check in the selectedIndexChanged event...

C#

private bool _iAmDoingSomething = false;
private void DoSomething()
{
   _iAmDoingSomething = true;
   YourDropDownControl.SelectedIndex = newIndex;
   _iAmDoingSomething = false;
}

private void SelectedIndexChangedHandler(...)
{
   if( _iAmDoingSomething )
      return;
   
   // Do the rest of your handler code.
}

Posted 16-Oct-12 10:09am

fjdiewornncalwe

Comments

Milan Mathew 16-Oct-12 16:31pm

Already tried this but this changes are happening in a dynamic control and its firing another selected index changed for each of the value changes and no way we can identify the user selection.

I need to call the selectedindexchanged only based on user selection (manual).

fjdiewornncalwe 16-Oct-12 16:37pm

There is always a way. :)
This is good extra information that we didn't have. You could also do something similar to this on the client-side with javascript where you effectively intercept the selectedindexchanged event for the dropdownlist and decide on the client side whether or not to let the postback occur. That is if you can attach a handler to the other dynamic control that could manage a "IamDoingSomething" flag in javascript.

Milan Mathew 16-Oct-12 16:49pm

Your suggestion looks good. I'll need try this out.

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Milan Mathew · Accepted Answer · 2012-10-16T10:51:00

The Solution provided by Marcus Kramer is working fine.
"Do something similar to this on the client-side with javascript where you effectively intercept the selectedindexchanged event for the dropdownlist and decide on the client side whether or not to let the postback occur. That is if you can attach a handler to the other dynamic control that could manage a "IamDoingSomething" flag in javascript."