Hierarchal Drawer with children of children

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Drawer
Abhay
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Abhay asked on 20 Mar 2022, 11:47 PM

Hi, I am trying to modify the existing code for the Hierarchical Drawer so I can have a nested nav menu in the drawer. Right now, when I add a level 2 child to a level 1 child, the level 2 child is not aligned properly; it is in line with the first original level when it should be indented. How can I fix this?

 

 


@inject IFacilityService FacilityService
@inject ILocationService LocationService


 
 <div class="custom-toolbar">
    <TelerikButton OnClick="@ToggleDrawer" Icon="menu" FillMode="@(ThemeConstants.Button.FillMode.Flat)"></TelerikButton>
    <span style="margin-left: 20px; font-weight: bold; font-size: 17px;">Wilder Fields Sensor Dashboard</span>
</div>

<TelerikDrawer @ref="@Drawer" Data="Data" MiniMode="false" Mode="@DrawerMode.Push" TItem="DrawerItem" SelectedItemChanged="@OnItemSelect" @bind-Expanded="@Expanded">
    <Template>
        <div class="k-drawer-items" role="menubar" aria-orientation="vertical">
             <LoginDisplay />
            <ul>
                @foreach (var item in context)
                {
                    var selectedClass = item == SelectedItem ? "k-state-selected" : string.Empty;
                    <li @onclick="@(() => OnItemSelect(item))" class="k-drawer-item @selectedClass">
                        <div class="k-level-@(item.Level)">
                            <TelerikIcon Icon="@item.Icon"></TelerikIcon>
                            <span class="k-item-text">@item.Text</span>
                        </div>

                        @if (item.Expanded && (item.Children?.Any() ?? false))
                        {
                            <span class="k-icon k-i-arrow-chevron-down" style="position:absolute; right:0; line-height: inherit; margin: 0 8px"></span>
                        }
                        else if (!item.Expanded && (item.Children?.Any() ?? false))
                        {
                            <span class="k-icon k-i-arrow-chevron-right" style="position:absolute; right:0; line-height: inherit; margin: 0 8px"></span>
                        }
                    </li>
                }
                
            </ul>
        </div>        
    </Template>
    <DrawerContent>
        @SelectedItem?.Description
    </DrawerContent>
</TelerikDrawer>







   

   <!--- <NotAuthorized>
        <a href="authentication/login">Log in</a>
    </NotAuthorized>-->



@code {
   
  

    

    protected override async Task OnParametersSetAsync()
    {
        await base.OnParametersSetAsync();

       
    }
    public TelerikDrawer<DrawerItem> Drawer { get; set; }
    public DrawerItem SelectedItem { get; set; }
    public bool Expanded { get; set; } = true;
    public IEnumerable<DrawerItem> Data { get; set; } =
    new List<DrawerItem>
    {
            new DrawerItem { Text = "R2D2", Icon = "question",
             Children = new List<DrawerItem>()
                {
                    new DrawerItem { Text = "Room 1", Icon = "grid", Level = 1,
                    Children = new List<DrawerItem>()
                {
                    new DrawerItem { Text = "Room 1", Icon = "grid", Level = 2 },
                    new DrawerItem { Text = "Calendar", Icon = "calendar-date", Level = 2, Description = "The Calendar component allows the user to scroll through a calendar and select one or more dates. " },
                    new DrawerItem { Text = "Menu", Icon = "menu", Level = 2, Description = "The Menu component displays data (flat or hierarchical) in a traditional menu-like structure." },
                }
                    
                    
                    
                    },
                   
                }
            
            
            
            
            
            },

            new DrawerItem {
                Text = "Components",
                Icon = "categorize",
                Description = "Blazor is still a new technology and the component suite is young. We are constantly working on adding new features and components. Tell us which components you want implemented and how you intend to use them, and Blazor, at our feedback portal.",
                Children = new List<DrawerItem>()
                {
                    new DrawerItem { Text = "Room 1", Icon = "grid", Level = 1, Description = "The Telerik Blazor Data Grid provides a comprehensive set of ready-to-use features covering everything from paging, sorting, filtering, editing, and grouping to row virtualization, optimized data reading, keyboard navigation and accessibility support." },
                    new DrawerItem { Text = "Calendar", Icon = "calendar-date", Level = 1, Description = "The Calendar component allows the user to scroll through a calendar and select one or more dates. " },
                    new DrawerItem { Text = "Menu", Icon = "menu", Level = 1, Description = "The Menu component displays data (flat or hierarchical) in a traditional menu-like structure." },
                }
            },
            new DrawerItem { Text = "Browser Support", Icon = "calendar", Description = "Browsers supported by Telerik UI for Blazor: Chrome (including Android and iOS), Edge, Firefox, Safari (including iOS)" }
        };

    public async Task ToggleDrawer() => await Drawer.ToggleAsync();

    protected override void OnInitialized()
    {
        SelectedItem = Data.First();
    }

    public void OnItemSelect(DrawerItem selectedItem)
    {
        SelectedItem = selectedItem;

        selectedItem.Expanded = !selectedItem.Expanded;
        var newData = new List<DrawerItem>();

        foreach (var item in Data.Where(x => x.Level <= selectedItem.Level))
        {
            newData.Add(item);
            if (item == selectedItem && selectedItem.Expanded && (item.Children?.Any() ?? false))
            {
                foreach (var child in item.Children)
                {
                    newData.Add(child);
                }
            }

            if (item != selectedItem && !(item.Children?.Contains(selectedItem) ?? false))
            {
                item.Expanded = false;
            }
        }

        Data = newData;
    }

    public class DrawerItem
    {
        public string Text { get; set; }

        public string Icon { get; set; }

        public bool Expanded { get; set; }

        public int Level { get; set; }

        public string Description { get; set; }

        public IEnumerable<DrawerItem> Children { get; set; }
    }


     


   
}


<style>
    #demo-runner {
        height: 600px;
    }

    .k-drawer-content {
        padding: 25px;
        font-size: 18px;
    }

    .k-drawer-container {
        position: relative;
        width: 100%;
        height: 95%;
    }

    .k-drawer .k-drawer-item {
        white-space: nowrap;
        overflow: hidden;
    }

    .k-level-1 {
        padding-left: 20px;
    }

    .custom-toolbar {
        width: 100%;
        background-color: #f6f6f6;
        line-height: 10px;
        border-bottom: inset;
        border-bottom-width: 1px;
        padding: 3px 8px;
        color: #656565;
    }
</style>

1 Answer, 1 is accepted

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Svetoslav Dimitrov
Telerik team
answered on 23 Mar 2022, 09:17 AM

Hello Abhay,

If your desired layout is Root-level item => level 1 child => level 2 child, you can follow the same styling convention as in the example you are using as a base. In it you can see a padding-left defined for the k-level-1 (matching the level 1 child):

    .k-level-1 {
        padding-left: 20px;
    }

In order to indent the level 2 children further to the right, you can define a similar style to this one:

    .k-level-2 {
        padding-left: 40px;
    }

I hope this helps you move forward with your application.

Regards,
Svetoslav Dimitrov
Progress Telerik

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Abhay
Top achievements
Rank 1
commented on 23 Mar 2022, 02:10 PM

Thank you for your help, Svetoslav, I really appreciate you getting back to me so quickly.
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Drawer
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Abhay
Top achievements
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Answers by
Svetoslav Dimitrov
Telerik team
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