Using AutoComplete with DropDownList style

5 posts, 0 answers
  1. IT Department
    IT Department avatar
    10 posts
    Member since:
    Apr 2010

    Posted 14 Jul 2014 Link to this post

    I cannot seem to get AutoComplete to behave properly when I have the DropDownStyle property set to DropDownList.

    AutoComplete works with multiple typed characters only when the user is able to type very fast. Even a slight delay in keyboard activity (1/4 second or less) causes the next key press to start looking through the item list as though we are looking for a match on the first character.

    As a simple example, if I have a dropdown with the following names in the item list:

    If I am looking for Allen, I can very quickly type A-L-L and the correct entry is chosen. However, even a slight delay between A and L, or between the first and second L will cause Larry to be selected.

    If I set the DropDownStyle property to Dropdown, I can type A-L-L as slowly as I want and select Allen. However, this does not prevent the user from entering a value that is not in the list.

    I have tried all of the AutoCompleteMode options and none of them seem to make any difference.

    Is there a property that would increase the time allowed between keystrokes and still recognize it as a single entry?

  2. Dess | Tech Support Engineer, Sr.
    Dess | Tech Support Engineer, Sr.  avatar
    4169 posts

    Posted 17 Jul 2014 Link to this post

    Hello Grant,

    Thank you for writing.

    There is a search timer, which Interval is set to 300 milliseconds by default. You can modify it using the ListElement.KeyboardSearchResetInterval property, which specifies how long the user must wait before searching with the keyboard is reset.

    I hope this information helps. Should you have further questions, I would be glad to help.

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  3. IT Department
    IT Department avatar
    10 posts
    Member since:
    Apr 2010

    Posted 17 Jul 2014 in reply to Dess | Tech Support Engineer, Sr. Link to this post

    Yes, this is exactly what I was looking for. We have some pretty long item lists, and sometimes it takes 3 or 4 characters to get to the item that you want. Setting this interval to 1500 milliseconds did the trick.
  4. John
    John avatar
    28 posts
    Member since:
    Sep 2013

    Posted 12 Feb 2015 Link to this post


    Is there a similar property in GridViewComboBoxColumn to control the reset interval.


  5. Stefan
    Stefan avatar
    2911 posts

    Posted 13 Feb 2015 Link to this post

    Hello John,

    Yes, there is. To access an editor in the grid to edit its properties you should use the CellEditorInitialized event:
    void radGridView1_CellEditorInitialized(object sender, GridViewCellEventArgs e)
    RadDropDownListEditor ddlEditor = e.ActiveEditor as RadDropDownListEditor;
    if (ddlEditor != null)
        RadDropDownListEditorElement ddlEditorElement = (RadDropDownListEditorElement)ddlEditor.EditorElement;
        ddlEditorElement.ListElement.KeyboardSearchResetInterval = 1000;

    More on the editors in the grid can be found here:

    I hope that you find this information useful. Should you have any other questions, do not hesitate to contact us.


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