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Control is slow to respond.

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MultiColumn ComboBox

This is a migrated thread and some comments may be shown as answers.

Brian@WTG asked on 07 Mar 2011, 11:58 PM

Hello,

I have a form with 3 "drop down" selectors that are used to filter a data grid. They have quite a few records in them. The first one has 1800, second has 4100 and the third has 12800.

I have tried quite a few drop down objects. The default .net combobox control, then the raddropdownlist. The data returned from the query is fast but the binding to the control is slow for the .net object. The raddropdownlist is extremely fast and I was going to use that except for two things. First, I can't seem to get the control to "text align=left" so when a value that's wider then the control is chosen your cursor goes off the object. Second it doesn't have multiple columns. After I read the "Auto Complete" doesn't work for the multicolumncombobox, I wasn't going to use it.

But then I went through the demo and the filtering functionality is good enough to simulate auto complete even if the user still has to choose a selection, they sacrifice the auto population for the multiple column view.

I've tried to use the multicolumncombobox for the 1800 record control and it is slow to respond. Even after it binds the data, changing selections or filters has some hiccups. The box is bound to an .xsd with three columns in it and only refreshes when the form loads. Is there something I can toggle to improve performance of the suggestion popup box?

Alternately, if there is a way to set the "text align=left" on the raddropdownlist control, the speed of that object is unmatched and I would rather use that.

Thank you

17 Answers, 1 is accepted

answered on 08 Mar 2011, 10:13 PM

I was trying to use the "RadMultiColumnComboBox" in my vb.net application. Filter changes are extremely slow to respond. Instead of that control I am now using the "RadDropDownList" because it's faster, though the example provided here does have a custom item list (he combined text with an image and a calendar object, basically another image), I'm just going to use the .xsd to combine some fields for a display member as a second column and have the value member be the necessary column.

When the form loads with the MultiColumn ComboBox, if you hit the down arrow, or start to type, there is at least a 10 second hang of the application. As I said in the first post, my test control had an 1800 record, 3 column data set. The bind to the control to load the form was reasonably quick, but as soon as you started to type in the text box, the refresh for the "filtered" results in the drop down was painfully slow. Then, if you backspaced and changed your query, it would hang again to reset sometimes worse than the first time.

I've already removed it from the form I was working on, but I will try to use it again when less records are involved, as it looks really nice. I would use it on the current form if it's performance was better - which is my original question. Is there something I can do to speed up the refresh of filtered results from the combo box? I thought about trying to limit the returned number of rows, but that will unfortunately block out data unless you re fill and re bind the data set to include the filter..

Thank you

Accepted

answered on 08 Sep 2011, 01:10 PM

Hello Martin,

This issue could be observed when using a lot of rows and the AutoSizeDropDownToBestFit option is set to true. You have to set this property to false to work around the issue. Presently, RadMultiColumnComboBox does not support load on demand functionality. We will consider your suggestion as feature request. If many customers require it, we will increase its priority in our TO DO list.

Should you have any other questions, do not hesitate to ask.

Best wishes,
Svett
the Telerik team

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Accepted

answered on 22 Nov 2013, 11:32 AM

Hello Chris,

Thank you for writing.

We prioritize issues according to user demand, hence if more users vote for the issue, higher its priority in our To-Do list will be.

If you want to use RadMultiColumnComboBox to display a lot of data, I can recommend to you to use the implementation from our KB article Performance Boots with Virtual RadMultiColumnComboBox - Quick Loading and Fast Filtering using Trie. This RadMultiColumnComboBox is optimized for cases which require the loading and filtering a lot of data.

I hope you will find this information helpful.

Regards,
George
Telerik

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