Detect final OnRowSelected and OnRowDeselected

[Rohan]

Hi,

Is it possible to detect (or if there is an event that I am missing) the final OnRowSelected/OnRowDeselected?

I have a grid of 100 items and I am turning toolbar icons on/off depending if there are any items in the grid selected or not i.e. if one or more items selected then turn on the Delete/Move buttons, if not, disable the Delete/Move buttons.

As the events (OnRowSelected and/or OnRowDeselected) fire for each row selection change, I don't really want to call the enable/disable methods 100 times (if the user selects ALL rows) and again 100 times if they deselect all rows.

Is there an event that fires when the final select/deselect event fires so you can then process the actuall selected rows?

The work around I am using is to have a timer created on the OnRowSelected and in the OnRowDeselected - this timer has an interval of 50ms which when fires does the toolbar options. Each time the OnRowSelected/OnRowDeselected  events fire they cancel the timer and create a new timer. So, if there is no events fired for 50ms I am "assuming" the events have completed and therefore perform the toolbar methods.

But this seems a bit of a hack.

Anyone got any ideas?

Thanks,

Ro

[Galin]

Hello Rohan,

As it is expected and also you mentioned the events OnRowSelected/OnRowDeselected are fire for each row selection change. There in no an event like OnRowsSelected.

Your suggested hack with time interval is a solution, but I am not sure if it will be improve the performance. Perhaps the better way is to check out how many items are selected and also to use a flag. So the event is fired again on every selection change, but your method will be called only when it is necessary, e.g.:

var selectedFlag = false;
function selectDeselectHandler(sender, arg)
{
    if(sender.get_selectedItemsInternal().length && !selectedFlag)
    {
        alert('select');
        selectedFlag = true;
    }
    else if(!sender.get_selectedItemsInternal().length && selectedFlag)
    {
        alert('deselect')
        selectedFlag = false;
    }
}

$find('RadGrid1').get_selectedItemsInternal().length

I hope this helps.


Regards,
Galin
the Telerik team

[Rohan]

Hi Galin,

Thank you for your work-around to this. It does seem a much better solution to the timer.

I have implemented your method and it works great!

Thanks again.

Ro