Filter for IsEmpty on the client

[Dasha]

Hello, can you please provide the syntax for using non-parameter filter types, such as IsEmpty and NotIsNull from javascript?

[Maria Ilieva]

Hi Dasha,

Note that filtering the RadGrid items is server operation and postback in this case is required. So you could not set custom filter items and handle their functionality only on the client. Find the help topics below which elaborates on customizing the filter options:
http://www.telerik.com/help/aspnet-ajax/grid-custom-option-for-filtering.html
http://www.telerik.com/help/aspnet-ajax/grid-custom-filter-options-with-handling.html


Best wishes,
Maria Ilieva
the Telerik team

[Dasha]

Maria,

I'm able to call FIlter of type EqualTo from the client like this:
masterTable.filter(columnName, cellValue, Telerik.Web.UI.GridFilterFunction.EqualTo);
This triggers a call back, and the Grid presents me with correct results.  Are you saying that IsNull is considered a custom filter and that I cannot make a similar call from the client?

[Maria Ilieva]

Hello Dasha,

The syntax for the IsNull filter is the same as you already applied for the EqualTo filter. See the help topic below for more information on this matter:
http://www.telerik.com/help/aspnet-ajax/grid-gridtableview-get-filterexpressions.html

All the best,
Maria Ilieva
the Telerik team

[Dasha]

So far I've tried the following variations:
var columnName = 'Status';
masterTable.filter(columnName, '', Telerik.Web.UI.GridFilterFunction.IsNull);
masterTable.filter(columnName, null, Telerik.Web.UI.GridFilterFunction.IsNull);
masterTable.filter(columnName, Telerik.Web.UI.GridFilterFunction.IsNull);

I'm getting an error on all.  Can you please tell me what I am doing wrong?

[Maria Ilieva]

Hi Dasha,

Try canceling the postback. For example:

function OnClientClicking(sender, args)
  {
      var masterTable = $find("<%= RadGrid1.ClientID %>").get_masterTableView();
      args.set_cancel(true);//canceling postback
      masterTable.filter("columnName", "", Telerik.Web.UI.GridFilterFunction.IsNull, true);

  }

Give this a try and let me know if it works.


Greetings,
Maria Ilieva
the Telerik team

[Maria Ilieva]

Hi Dasha,

Try canceling the postback. For example:

function OnClientClicking(sender, args)
  {
      var masterTable = $find("<%= RadGrid1.ClientID %>").get_masterTableView();
      args.set_cancel(true);//canceling postback
      masterTable.filter("columnName", "", Telerik.Web.UI.GridFilterFunction.IsNull, true);

  }

Give this a try and let me know if it works.


Greetings,
Maria Ilieva
the Telerik team