TreeView Icons

You can add Telerik Font or SVG icons to the TreeView items. The component also supports custom icons.

To use TreeView item icons, define a property in the component model class and assign the property name to the IconField parameter of the respective TreeViewBinding.

The model property can hold:

• A property of the static SvgIcon class;
• A member of the FontIcon enum;
• A string that is a CSS class for a custom icon.

If the icon property name in the TreeView model is Icon, there is no need to set the IconField parameter.

Make sure to register font-icons.css if using Telerik font icons.

How to use icons in the Telerik TreeView

<TelerikTreeView Data="@TreeViewData"
                 @bind-ExpandedItems="@TreeViewExpandedItems">
    <TreeViewBindings>
        <TreeViewBinding IconField="@nameof(TreeItem.Icon)" />
    </TreeViewBindings>
</TelerikTreeView>

<style>
    /* Third-party icon libraries should provide these styles out-of-the-box. */

    /* base styles for all custom icons */
    .my-icon {
        /* Define size, position and font styles here. */
        display: inline-block;
        width: 1em;
        height: 1em;
        font-size: 16px;
    }

    /* styles for specific custom icons */
    .my-icon-purple {
        /* define a background image or a font icon glyph here */
        background: purple;
    }
</style>

<!-- Load this stylesheet only if using Telerik font icons -->
<link href="https://blazor.cdn.telerik.com/blazor/5.1.1/kendo-font-icons/font-icons.css" rel="stylesheet" type="text/css" />

@code {
    private List<TreeItem> TreeViewData { get; set; } = new List<TreeItem>();

    private IEnumerable<object> TreeViewExpandedItems { get; set; } = new List<TreeItem>();

    protected override void OnInitialized()
    {
        TreeViewData.Add(new TreeItem()
        {
            Id = 1,
            Text = "SVG Icon",
            ParentId = null,
            HasChildren = true,
            Icon = SvgIcon.Home
        });

        TreeViewData.Add(new TreeItem()
        {
            Id = 2,
            Text = "Font Icon",
            ParentId = 1,
            HasChildren = false,
            Icon = FontIcon.Envelope
        });

        TreeViewData.Add(new TreeItem()
        {
            Id = 3,
            Text = "Custom Icon",
            ParentId = 1,
            Icon = "my-icon my-icon-purple"
        });

        TreeViewData.Add(new TreeItem()
        {
            Id = 4,
            Text = "Empty Icon",
            ParentId = 1,
            Icon = "my-icon"
        });

        ((List<TreeItem>)TreeViewExpandedItems).Add(TreeViewData.First());
    }

    public class TreeItem
    {
        public int Id { get; set; }
        public string Text { get; set; }
        public bool HasChildren { get; set; }
        public int? ParentId { get; set; }
        public object Icon { get; set; }
    }
}

See Also

• TreeView Overview