adjust time to type in dropdownlist

[Hans]

is it possible to increase the amount of time that one can type in a dropdownlist in order to 'search' for an item ?

[George]

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

[Hans]

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

[Hans]

After much googling I found the solution:


myDropDownList.DropDownStyle = RadDropDownStyle.DropDown;
myDropDownList.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
myDropDownList.DropDownListElement.AutoCompleteAppend.LimitToList = true;

[George]

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

[Mehry]

Thank you! it works for me.