JavaScript/jQuery TreeView - items

The TreeView works with object collections that can have a plain or hierarchical structure. Depending on the structure, the objects should provide different data fields. Specify the dataStructure option to notify the TreeView of the used structure and refer to the option's description for information on the required fields.

If you need to update the widget items, reassign the entire items array as shown in the following example:

treeViewInstance.option('items', newItems);

As an alternative to items, you can use the dataSource option. It accepts the DataSource object, whose underlying stores provide an API that allows you to update individual items without reassigning the entire item collection.

This field makes sense no matter whether a custom template or the default one is used.

See Also

• Expand and Collapse Nodes
• expandedExpr

This field is used when the virtual mode is enabled. It can hold a Boolean value or a function that returns a Boolean value.

This option accepts one of the following:

• The icon's URL
• The icon's name if the icon is from the DevExtreme icon library
• The icon's CSS class if the icon is from an external icon library (see External Icon Libraries)
• The icon in the Base64 format
• The icon in the SVG format. Ensure that the source is reliable.

Nested items should have the same structure as the first-level items.

See Also

• Use Hierarchical Data
• Customize Node Appearance

This field makes sense no matter whether a custom template or the default one is used.

This field makes sense no matter whether a custom template or the default one is used.

See Also

• Select Nodes Initially
• selectedExpr

The following types of the specified value are available.

• Assign a string containing the name of the required template.
• Assign a jQuery object of the template's container.
• Assign a DOM Node of the template's container.
• Assign a function that returns the jQuery object or a DOM Node of the template's container.

See Also

• Custom Templates