How to use keyboard arrow keys for navigation

[Juan]

Hi!
I am using TreeListView Q2 2010. I can't find in documentation how to use keyboard arrow keys for navigation. Can you give an example ?

I also want TreeListView to input 0 in int field when its value is deleted. Because now validator shows error when no value is entered in a field.

Thanks in Advance.
Juan.

[Veselin Vasilev]

Hi Juan,

You can use the Up / Down / Left / Right arrows to navigate in RadTreeListView. You can test this in our online demo.

As for your second question - you can subscribe to the CellValidating event and define its handler as below:

private void clubsGrid_CellValidating(object sender, GridViewCellValidatingEventArgs e)
{
    if (e.Cell.Column.Header.ToString() == "Stadium" && e.NewValue == "")
    {
        (e.Row.DataContext as Club).StadiumCapacity = 0;
        e.IsValid = true;
    }
}

Hope this helps.

Greetings,
Veselin Vasilev
the Telerik team

[Juan]

Hi Veselin,
I've seen your demo and navigition works fine. But i've forgotten to mention that I also have to made a certain cell active for editing in selected row when I use arrow keys for navigation. I am not sure which event handler should I use for it. Will it affect the selection of next row's  cell on Enter button ?

I've set breakpoints in  CellValidating event handler but they don't fire. It seems that it doesn't work.


[Veselin Vasilev]

Hi Juan,

You can easily override the default behavior of the special keys like Enter. You can check this help topic which targets RadGridView, but as you probably know RadTreeListView inherits GridViewDataControl, so the approach will work there as well.

Best wishes,
Veselin Vasilev
the Telerik team

[Juan]

Hi Veselin,

It's turned out that some additional code is required to make it work.
i've added this to your code:

e.Cell.Value = 0;
TextBox tb = (TextBox)e.EditingElement;
tb.Text = "0";
e.Handled = true;

Thanks for help.
Juan

TextBox tb = (TextBox)e.EditingElement;

                    //if (tb.Text == "") 

                        tb.Text = "0";

                    e.Handled = true;

TextBox tb = (TextBox)e.EditingElement;

                    //if (tb.Text == "") 

                        tb.Text = "0";

     TextBox tb = (TextBox)e.EditingElement;

                        tb.Text = "0";

                    e.Handled = true;