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Auto-dropdown GridViewComboBoxColumn on single-click?

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joseph_korn
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joseph_korn asked on 15 May 2008, 09:20 PM
I am wondering if it is possible to have a GridViewComboBoxColumn that when clicked on, will automatically dropdown the list of choices for you to choose from (This saves one click when you are clicking many comboboxes in one go)? I imagine you would run the dropdown code in the CellBeginEdit event.. I am just not sure exactly how to accomplish this..

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Martin Vasilev
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answered on 17 May 2008, 03:54 PM
Hi Joseph,

Thank you for the question.

You can show the drop down on first click by using RadComboBoxEditor's ShowDropDown() method in the CellEditorInitialized event. Please, review the following code-block:
 
private void radGridView1_CellEditorInitialized(object sender, GridViewCellEventArgs e)  
{  
    if ((this.radGridView1.ActiveEditor != null) &&   
        (this.radGridView1.ActiveEditor is RadComboBoxEditor))  
    {  
        (this.radGridView1.ActiveEditor as RadComboBoxEditor).ShowDropDown();     
    }  

I hope this helps. If you have other questions, do not hesitate to contact me again.

 
Greetings,
Martin Vasilev
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Marina Vision
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answered on 14 Jun 2010, 07:56 AM
This command doesn't work anymore:
(this.grdItems.ActiveEditor as RadComboBoxEditor).ShowDropDown(); 
I'm using Releases Q1-2010.
Was it replaced with a new command?

Thanks,
Marina


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Martin Vasilev
Telerik team
answered on 17 Jun 2010, 04:04 PM
Hi Marina Vision,

Thank you for writing.

In Q1 2010 release we have introduced a different editor structure and the implementation of the Auto-DropDown should be done in a different way, namely, by with using a custom combo-box editor. Please consider the following code snippet:
void radGridView1_EditorRequired(object sender, EditorRequiredEventArgs e)
{
    if (e.EditorType == typeof(RadComboBoxEditor))
    {
        e.Editor = new CustomComboEditor();
    }
}
class CustomComboEditor : RadComboBoxEditor
{
    public override void BeginEdit()
    {
        base.BeginEdit();
        ((RadComboBoxEditorElement)this.EditorElement).ShowPopup();
    }
}

Let me know if you have any additional questions.

Kind regards,
Martin Vasilev
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Jimmy
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answered on 27 Jun 2018, 01:39 PM

I am trying to use a GridViewComboBoxColoumn in my Winform Application and I want to eliminate the 3 clicks it takes to select a value in the combo. 

Can I subscribe to an event and automatically show the combo?  

 

Thanks for your help,

Jimmy Voegele

 

 

0
Dess | Tech Support Engineer, Principal
Telerik team
answered on 28 Jun 2018, 08:24 AM
Hello, Jimmy,   

In order to show the popup immediately after activating the editor you can use the following code snippet when handling the RadGridView.CellEditorInitialized event: 

private void radGridView1_CellEditorInitialized(object sender, GridViewCellEventArgs e)
{
    RadDropDownListEditor ddl = e.ActiveEditor as RadDropDownListEditor;
    if (ddl!=null)
    {
        RadDropDownListEditorElement el = ddl.EditorElement as RadDropDownListEditorElement;
        el.ShowPopup();
    }
}

In addition, you can subscribe to the CellClick event and force entering edit mode: 
           GridViewComboBoxColumn comboCol = new GridViewComboBoxColumn("CategoryName");
           comboCol.DataSource = this.categoriesBindingSource;
           comboCol.ValueMember = "CategoryID";
           comboCol.DisplayMember = "CategoryName";
           comboCol.FieldName = "CategoryID";
           comboCol.Width = 200;
           this.radGridView1.Columns.Add(comboCol);      
 
private void radGridView1_CellClick(object sender, GridViewCellEventArgs e)
       {
           if (e.Column.HeaderText =="CategoryName")
           {
               this.radGridView1.BeginEdit();  
           }
       }

Thus, only with a single click, you can activate the editor and show the drop down.

I hope this information helps. If you have any additional questions, please let me know. 

Regards,
Dess
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joseph_korn
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Martin Vasilev
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Marina Vision
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Jimmy
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Dess | Tech Support Engineer, Principal
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