Custom Filtering

[David]

Hi,

I have applied custom filtering on the Treeview on Drop down selection change. Let's say I have applied filter to show only checked nodes and it did only showed me checked nodes. After filtering I unchecked one or more nodes but It didn't hide them so I figured that I might have to apply Filter on it again which I did but it didn't applied any filter nor did it go to the Filter Function that I have linked to it as well. Al thought it's working from UI.

Here's my code:

TreeView.TreeViewElement.FilterPredicate = FilterNode;


private bool FilterNode(RadTreeNode node)
 {
            bool filter = false;
            //Code 
            return filter;
 }

//For applying the filter

TreeView.Filter = string.Empty;
TreeView.Filter = "Custom";

Let me know if that makes any sense.

Thanks,
Attiqe

[Dimitar]

Hello Attiqe,

Your question has already been answered in the support thread you have opened. Nevertheless I am copying the answer here in order the community to benefit from it:

If you are triggering the custom filtering functionality in an event like NodeCheckedChanged you should enclose the filter reset in a Begin\End Update block. This will trigger an explicit nodes update and the filter will be applied again: 

radTreeView1.BeginUpdate();
this.radTreeView1.Filter = "";
this.radTreeView1.Filter = "Custom";
radTreeView1.EndUpdate();

If you have any questions, please do not hesitate to contact us.

 

Regards,
Dimitar
Telerik