RadGrid FilterMenu causing javascript error, not sure if it is a bug

[Peter]

2014.2.724.45
When in Grid Init event:
GridID.FilterMenu.Items.Clear()

With filtering active on a column, clicking the filter button generates this javascript error:

Uncaught TypeError: Cannot read property `_linkElement` of undefined

Referring to this code:
Type.registerNamespace("Telerik.Web.UI");
Telerik.Web.UI.GridColumn=function(a){Telerik.Web.UI.GridColumn.initializeBase(this,[a]);
.....
var h=this._filterMenu.get_focusedItem()||this._filterMenu.get_items().getItem(0);
if(h._linkElement){h._linkElement.focus();  <-- err line. 6623
}else{if(h._templateElement){h._templateElement.focus();

The line above does not appear in the the version 2014.1.403.45 nor does the same error happen.

I have to add 
<ClientEvents OnFilterMenuShowing="RadGrid_DisableFilterMenu" />

function RadGrid_DisableFilterMenu(sender, args) {
  args.set_cancel(true)
}

[Konstantin Dikov]

Hello Peter,

The behavior that you are describing is due to the fact that the FilterMenu must have at least one element. As you can see in the line above the one throwing the error, when the menu is opened, the first item is retrieved with "filterMenu.get_items().getItem(0)". Since further logic depends on that item, when you remove all items from the FilterMenu, that logic will fail. 

Generally, there are no use cases when you will need a filter menu and have no items, so that is the reason for not checking the length of the items collection.

Hope this helps.


Best Regards,
Konstantin Dikov
Telerik