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HeaderTemplate

You can control and customize the rendering of the header items in the PanelBar by using the HeaderTemplate. It provides a context object that you can cast to the type that the PanelBar is bound to.

The HeaderTemplate of a level is defined under the PanelBarBinding tag.

If no levels are defined the HeaderTemplate will apply to the entire data.

Use HeaderTemplate to customize the rendering of the headers in the PanelBar

@* Customize the rendering of the parent items in the PanelBar *@

<div style="width: 30%;">
    <TelerikPanelBar Data="@Items"
                     @bind-ExpandedItems="@ExpandedItems">
        <PanelBarBindings>
            <PanelBarBinding>
                <HeaderTemplate>
                    @{
                        var item = context as PanelBarItem;

                        <div style="font-weight: bold; text-decoration: underline">
                            @item.Text
                        </div>
                    }
                </HeaderTemplate>
            </PanelBarBinding>
        </PanelBarBindings>
    </TelerikPanelBar>
</div>

@code {
    public List<PanelBarItem> Items { get; set; }
    public IEnumerable<object> ExpandedItems { get; set; } = new List<object>();

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

    private List<PanelBarItem> LoadFlatData()
    {
        List<PanelBarItem> items = new List<PanelBarItem>();

        items.Add(new PanelBarItem()
        {
            Id = 1,
            Text = "Project",
            ParentId = null,
            HasChildren = false,
            Icon = "folder",
            Url = "projectURL.url"
        });

        items.Add(new PanelBarItem()
        {
            Id = 2,
            Text = "Implementation",
            ParentId = null,
            HasChildren = true,
            Icon = "code"
        });

        items.Add(new PanelBarItem()
        {
            Id = 3,
            Text = "C#",
            ParentId = 2,
            HasChildren = false,
            Icon = "cs"
        });

        items.Add(new PanelBarItem()
        {
            Id = 4,
            Text = "HTML 5",
            ParentId = 2,
            HasChildren = false,
            Icon = "html5"
        });

        items.Add(new PanelBarItem()
        {
            Id = 5,
            Text = "CSS",
            ParentId = 2,
            HasChildren = false,
            Icon = "css"
        });

        return items;
    }

    protected override void OnInitialized()
    {
        Items = LoadFlatData();

        ExpandedItems = new List<object>() { Items[1] };

        base.OnInitialized();
    }
}

The result from the code snippet above

HeaderTemplate example

See Also

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