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adjust time to type in dropdownlist

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DropDownList
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Hans
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Hans asked on 25 Nov 2013, 02:44 PM
is it possible to increase the amount of time that one can type in a dropdownlist in order to 'search' for an item ?

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George
Telerik team
answered on 28 Nov 2013, 12:57 PM
Hello Hans,

Thank you for contacting us.

By design RadDropDownList processes the autocomplete information on every KeyPress, however you can easily change this behavior with the following custom classes:
public class MyDropDownList : RadDropDownList
{
    protected override RadDropDownListElement CreateDropDownListElement()
    {
        return new MyDropDownListElement();
    }
}
 
public class MyDropDownListElement : RadDropDownListElement
{
    private KeyPressEventArgs args;
 
    protected override AutoCompleteSuggestHelper CreateAutoCompleteSuggestHelper()
    {
        return new MyHelper(this, 1000);
    }
 
}
 
public class MyHelper : AutoCompleteSuggestHelper
{
    private System.Windows.Forms.Timer timer;
    private string filter;
    private bool timePassed;
 
    public int AutoCompleteInterval { get; set; }
 
    public MyHelper(RadDropDownListElement owner, int interval)
        : base(owner)
    {
        this.AutoCompleteInterval = interval;
        this.timer = new System.Windows.Forms.Timer { Interval = interval };
        this.timer.Tick += timer_Tick;
    }
 
    private void timer_Tick(object sender, EventArgs e)
    {
        this.timePassed = true;
        this.HandleAutoSuggest(this.filter);
    }
 
    public override void HandleAutoSuggest(string filter)
    {
        if (this.timePassed)
        {
            base.HandleAutoSuggest(filter);
        }
 
        this.filter = filter;
        this.timer.Stop();
        this.timer.Start();
        this.timePassed = false;
    }
}

This will perform filtering operations one second after a user has typed something in the TextBox.

I hope this helps.

Regards,
George
Telerik
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Hans
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answered on 28 Nov 2013, 02:54 PM
in the code I see 'private KeyPressEventArgs args' but I think you forgot the code that actually does something with the keypress, because the sample is not working
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Hans
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answered on 28 Nov 2013, 08:53 PM
After much googling I found the solution:


myDropDownList.DropDownStyle = RadDropDownStyle.DropDown;
myDropDownList.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
myDropDownList.DropDownListElement.AutoCompleteAppend.LimitToList = true;
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George
Telerik team
answered on 03 Dec 2013, 11:59 AM
Hello Hans,

I am glad that you managed to resolve your problem.

Should you need any further assistance, do not hesitate to contact us.

Regards,
George
Telerik
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Mehry
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answered on 17 Mar 2020, 04:04 PM
Thank you! it works for me.
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