Header Context Menu for Column max count selected colum set 4

[Մուշեղ]

how i can set max selected column count , when i select example 4 checkbox other checkbox is disabled and enabled when selected checkbox count less then 4

or


 <telerik:RadGrid 
.....


  <ClientSettings EnableRowHoverStyle="true">
                <ClientEvents OnFilterMenuShowing="filterMenuShowing" />
               <ClientEvents OnColumnHidden="onColumnHidden" OnColumnShown="onColumnShow" />
                <Selecting AllowRowSelect="True" />
            </ClientSettings>

.........................


 function onColumnShow(sender, args) {
                                     
                                        //calculate selected checkbox count
                                    }


how calculate selected checkbox count
           

[Viktor Tachev]

Hello,

In order to achieve this functionality you could use a global variable to hold the number of displayed columns. Using the OnColumnShowing and OnColumnHiding events you could modify the variable accordingly. These events could be canceled so you could check the number of the visible columns and cancel the event if a condition is met.

Give this approach a try and you should be able to achieve the needed functionality.

Regards,
Viktor Tachev
Telerik