Filtering

The TreeView provides a mechanism for rendering a filter input as well as built-in filter handling through the kendoTreeViewHierarchyBinding and kendoTreeViewFlatDataBinding directives.

The TreeView does not support server-side data filtering.

Built-in Filter Input Element

To show the default built-in filter input element, set the filterable prop of your TreeView to true. It is set to false by default. Once filterable is set to true, the TreeView will start emitting a filterChange event. You could then either use one of the data-binding directives, or handle the filterChange event manually.

Built-in Filtering

You could use the kendoTreeViewHierarchyBinding or the kendoTreeViewFlatDataBinding directive to take advantage of their built-in filtering. This could be done in one of two ways:

• Just set filterable to true as described above and filtering will work out of the box.
• Pass a filter prop to the kendoTreeViewHierarchyBinding or the kendoTreeViewFlatDataBinding directive. This works even when the built-in input is not shown (filterable = false).

Filtering Using the Hierarchy Binding Directive

Using the kendoTreeViewHierarchyBinding directive with filterable set to true:

Using the kendoTreeViewHierarchyBinding filtering by passing it a filter prop from an external source:

Filtering Using the Flat Binding Directive

Using the kendoTreeViewFlatDataBinding directive with filterable set to true:

Using the kendoTreeViewFlatDataBinding filtering by passing it a filter prop from an external source:

Setting an Initial Filter

Passing a filter prop to a TreeView which both uses one of our data-binding directives, and has its filterable prop set to true, will result in an initial filtration being applied as soon as the component loads.

Passing a filter prop to a TreeView which does not use kendoTreeViewHierarchyBinding or kendoTreeViewFlatDataBinding will just set an initial value to the built-in input element, but no filtering will be performed automatically.

Manual Filtering

To manually filter the TreeView component in combination with children and hasChildren functions, first set its filterable prop to true. Once that's done, the TreeView will start emitting a filterChange event, which is a string containing the filter term.

The following example demonstrates a manual search function which filters the data passed to the TreeView.

Suggested Links

• API Reference of the TreeView