Add hierarchical tree view in the Categories widget
The Categories widget by default has just one view that shows all available categories as a flat list.
This tutorial demonstrates how to create a view that displays a tree, which preserves the hierarchy of the categories. For example:
You first configure the Categories widget and then add and implement the new categories view.
Enable Hierarchy mode in the Categories widget
- Open the widget designer.
- Under Which categories to display?, select one of the following options:
- Top level categories only
- All categories under particular category...
- Only categories used by content type...
- Click the Advanced button.
In the FlattenHierarchy field enter False.
NOTE: After setting this option to False, the widget will start performing additional calls to the database for each taxon, so that it retrieves its children. For a very large taxonomy, this may decrease the performance of the widget.
Click the Save button.
Add new view to the widget
- In the
~/Mvc/Views/HierarchicalTaxonomy/ folder, create a new file named
- Click Edit in the upper right corner of the widget and open the Settings tab page.
- From the Template dropdown menu, select the newly added view.
Implement the view
The view model contains a Taxa collection of objects of type
Telerik.Sitefinity.Frontend.Taxonomies.Mvc.Models.TaxonViewModel. Such objects contain a SubTaxa collection that contains the child taxa.
In your new view, you recursively render each level of children. In the code below, you add buttons marked with the attribute
data-sf-toggle to expand and collapse the inner categories. Each sublist of categories is marked with the attribute
click event handler to each expand and collapse button. In addition, you add and remove CSS classes to the buttons and the sublists, so that you can show and hide them.
The CSS code formats the tree and applies styles to the expand buttons and the sublists of categories. You can insert this code in the view's file, using a
Use the following example for the code of the view: