Update cell on selecting dropdown value

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Vitaly posted over 16 years ago

Hi,

I need to have a cell updated when a new dropdown value has been selected. Is there some setting for it?

I thought to handle the CellListSelect event and perform ExitEditMode action. That does what I want, but after the CellListSelect event handler the NullReferenceException is thrown inside the infragistics dll, that's probably a bug. Isn't that? However, I didn't try to reproduce that in the small sample application.

Thanks,

Vitaly

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Offline Mike Saltzman posted over 16 years ago

Hi Vitaly,
I don't understand your question. Why would you have to do anything to get a cell to update when the user picks a value from a DropDown? This happens automatically.
Do you mean you are creating your own dropdown? If so, then I need more information about what you are doing and what kind of dropdown you are using.
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1500

Vitaly posted over 16 years ago in reply to Mike Saltzman

Hi Mike, Thanks for the response. I set the Cell.Style to ColumnStyle.DropDown and populate the cell's ValueList collection. The behavior I'm seeing is that the value that has been selected from the dropdown will be committed only when the cell exits edit mode. I need it to be committed right after the value has been selected. I tried to achieve this by performing ExitEditMode action in the CellListChange event handler but the NullReferenceException is being thrown inside the infragistics dll after the handler finishes execution.
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Offline Mike Saltzman posted over 16 years ago in reply to Vitaly

Oh, okay, I understand now.
Performing ExitEditMode should not be raising an exception. That sounds like a bug to me. Do you have the latest Hot Fix?
In any case, are you sure that's really what you want to do? If you exit edit mode on the cell, it might be confusing to the user. If they will select an item from the list using the keyboard, then they will be unable to select a different item if they make a mistake without using the mouse. Why do you need to cell to commit the value immediately?
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Vitaly posted over 16 years ago in reply to Mike Saltzman

Other cells depend on the value of the cell that has the dropdown. So, if a user selects a new value from the dropdown and nothing happens to other depending cells that won't be intuitive to the user and he'll think something like "Hm... I've changed the price of the product but the total price remains the same!"
However, now I think I will recount depending cell on CellListChange event and that seems right.
Thanks for your help.
P.S. I don't have the latest Hot Fix, but I'll try it. If the issue with the exception remains I'll contact tech support.
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Nigel posted over 14 years ago in reply to Mike Saltzman

Thanks for the tip. Just started working on some Infragistics grid development today (using 10.2). It's been a while and have found answers in the 'samples' downloaded. However the forums are proving very valuable. I was struggling to understand why the 'value' property of the cell was DBNULL. I found this article and spotted the note about using 'TEXT' property. Now all is well!
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Offline Mike Saltzman posted over 16 years ago in reply to Vitaly

I think the right event to use for something like this would be CellChange. Ths event fires as the user modifies the cell. The only tricky part of this is that the Value of the cell won't be updated when this event fires, so you have to use the Text.
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