Inserting Checkbox in header of gridviewcheckboxcolumn

[jeff torririt]

Hi,

I need to place a checkbox in a header of a gridviewcheckboxcolumn of radgridview. for obvious reason. how can i do it in rad gridview?

Thanks

[Jack]

Hi jeff,

Please look at this KB article. It demonstrates how to implement the desired scenario. If you have other questions, we will be glad to assist you.

Best wishes,
Jack
the Telerik team

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[jeff torririt]

Thanks.. my problem now is how can i uncheck the checkbox in the header when i unchecked one of the checkboxes in the gridviewcheckboxcolumn..

Many Thanks,

Jeff

[Jack]

Hi jeff torririt,

You can handle ValueChanged event and when the editor value is false set the column header checkbox to false too. Please consider the following code, I modified some of the methods of CheckBoxHeaderCell from the KB:

 

bool suspendToggleStateChanged;

public override void Initialize()
{
    base.Initialize();
    ApplyThemeToElement(checkbox, "ControlDefault");
    this.GridControl.ValueChanged += new EventHandler(GridControl_ValueChanged);
}

void GridControl_ValueChanged(object sender, EventArgs e)
{
    RadCheckBoxEditor editor = sender as RadCheckBoxEditor;
    if (editor != null && (bool)editor.Value == false)
    {
        suspendToggleStateChanged = true;
        checkbox.ToggleState = Telerik.WinControls.Enumerations.ToggleState.Off;
        suspendToggleStateChanged = false;
    }
}

private void checkbox_ToggleStateChanged(object sender, StateChangedEventArgs args)
{
    if (suspendToggleStateChanged)
    {
        return;
    }
    if (this.ColumnInfo is GridViewCheckBoxColumn)
    {
        bool valueState = false;

        if (args.ToggleState == Telerik.WinControls.Enumerations.ToggleState.On)
        {
            valueState = true;
        }

        for (int i = 0; i < this.ViewTemplate.RowCount; i++)
        {
            this.ViewTemplate.Rows[i].Cells[this.ColumnIndex].Value = valueState;
        }
    }
}

 

Sincerely yours,
Jack
the Telerik team

Instantly find answers to your questions on the new Telerik Support Portal.
Watch a video on how to optimize your support resource searches and check out more tips on the blogs.

[jeff torririt]

Many thanks.

Jeff

[Trinh]

Well, I have a problem with RadGridView, grid have one column grouped. The select all check box has no effect.
Could anyone help me?? Thank a lot

[Jack]

Hello Trinh,

When using code from this KB article you should change the checkbox_ToggleStateChanged method to cover the described scenario. Consider the following code:

private void checkbox_ToggleStateChanged(object sender, StateChangedEventArgs args)
{
    if (!suspendProcessingToggleStateChanged)
    {
        bool valueState = false;

        if (args.ToggleState == Telerik.WinControls.Enumerations.ToggleState.On)
        {
            valueState = true;
        }
        this.GridViewElement.EditorManager.EndEdit();
        this.TableElement.BeginUpdate();

        IterateRows(this.ViewInfo.ChildRows, valueState);

        this.TableElement.EndUpdate(false);

        this.TableElement.Update(GridUINotifyAction.DataChanged);

    }
}

void IterateRows(GridViewChildRowCollection rows, bool valueState)
{
    for (int i = 0; i < rows.Count; i++)
    {
        if (rows[i] is GridViewDataRowInfo)
        {
            rows[i].Cells[this.ColumnIndex].Value = valueState;
        }
        else
        {
            IterateRows(rows[i].ChildRows, valueState);
        }
    }
}

If you have other questions, do not hesitate to contact us.
 
All the best,
Jack
the Telerik team

[Trinh]

It works, thank a lot..........