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A single GridCommandButton that invokes a popup listing the context actions

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Adrian
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Adrian asked on 23 Mar 2021, 05:22 PM

I have a grid and on each row context you can perform 10+ action.  I don't want to add 10+ different GridCommandButtons as that wouldn't look good.

I would like to have a single button on each row that the user can click and when its clicked a popup of available actions appears for them to select.

Is that possible on a Blazor Grid ?

I would like it to look something like this image.

 

 

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Marin Bratanov
Telerik team
answered on 24 Mar 2021, 05:50 PM

Hi Adrian,

You can use the context menu component for that. You can show it through code on an event of your choice (say, @onclick) of any button in the grid. You can store the current row model for use in the context menu clicks too. You can find similar examples here: https://docs.telerik.com/blazor-ui/components/contextmenu/integration. The context menu also offers the separators I see in the provided screen recording. 

As for invoking actions on the grid - you can use the grid state to, for example, put an item in edit mode: https://docs.telerik.com/blazor-ui/components/grid/state. The rest of the actions seem custom actions anyway. To get the row model you would have to use a "regular" grid column, not a command column. The command column will provide the current row when this is implemented.

Another UX approach would be using a split button when it becomes available: https://feedback.telerik.com/blazor/1435750-split-button. If you would prefer that, Vote and Follow that feature.

Regards,
Marin Bratanov
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Adrian
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answered on 24 Mar 2021, 08:02 PM

Thanks.

 

I have it working when right-clicking on a row but need it to work when left-clicking on the GridCommandButton.

I'm struggling to trigger the ContextMenu from the OnClick event of a GridCommandButton.

The GridCommandEventArgs doesn't contain MouseEventArgs so am not able to position the context menu next to the GridCommandButton.

 

Do you have any examples of doing this?

 

Many thanks.

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Marin Bratanov
Telerik team
answered on 25 Mar 2021, 06:18 AM

Hi Adrian,

You can use a regular button whose onclick event gives you the MouseEventArgs.

Here's an example I made for you based on the docs example, tweaked to use left click:

@using System.Collections.Generic
@using System.Collections.ObjectModel

<TelerikContextMenu @ref="@ContextMenuRef" Data="@MenuItems" OnClick="@((MenuItem item) => OnItemClick(item))"></TelerikContextMenu>

<TelerikGrid Data="@GridData" @ref="@GridRef"
             EditMode="@GridEditMode.Inline"
             Height="500px"
             Pageable="true"
             OnCreate="@CreateItem" OnUpdate="@UpdateHandler"
             SelectionMode="@GridSelectionMode.Multiple"
             @bind-SelectedItems="@SelectedItems">
    <GridToolBar>
        <GridCommandButton Command="Add" Icon="add">Add Employee</GridCommandButton>
    </GridToolBar>
    <GridColumns>
        <GridColumn Field=@nameof(SampleData.ID) Editable="false" />
        <GridColumn Field=@nameof(SampleData.Name) />
        <GridColumn>
            <Template>
                <span @onclick:stopPropagation="true">
                    <TelerikButton OnClick="@( (MouseEventArgs e) => ShowRowOptions(e, context as SampleData) )" Icon="more-vertical"></TelerikButton>
                </span>
            </Template>
        </GridColumn>
    </GridColumns>
</TelerikGrid>

@if (SelectedItems.Any())
{
    <ul>
        @foreach (var item in SelectedItems)
        {
            <li>@item.Name</li>
        }
    </ul>
}

@code {
    //data sources
    ObservableCollection<SampleData> GridData { get; set; }
    List<MenuItem> MenuItems { get; set; }
    IEnumerable<SampleData> SelectedItems { get; set; } = Enumerable.Empty<SampleData>();
    //metadata for the context menu actions
    SampleData SelectedPerson { get; set; }
    //component references so we can use their methods
    TelerikContextMenu<MenuItem> ContextMenuRef { get; set; }
    TelerikGrid<SampleData> GridRef { get; set; }

    // sample menu item class
    public class MenuItem
    {
        public string Text { get; set; }
        public string Icon { get; set; }
        public Action Action { get; set; }
        public string CommandName { get; set; }
    }

    // show the context menu for a particular row
    async Task ShowRowOptions(MouseEventArgs e, SampleData row)
    {
        SelectedPerson = row;
        await ContextMenuRef.ShowAsync(e.ClientX, e.ClientY);
    }

    // sample handling of the context menu click
    async Task OnItemClick(MenuItem item)
    {
        // one way to pass handlers is to use an Action, you don't have to use this
        if (item.Action != null)
        {
            item.Action.Invoke();
        }
        else
        {
            // or you can use local code to perform a task
            // such as put a row in edit mode or select it
            switch (item.CommandName)
            {
                case "BeginEdit": // read more at https://localhost/blazor-ui/components/grid/state#initiate-editing-or-inserting-of-an-item
                    var currState = GridRef.GetState();
                    currState.InsertedItem = null;
                    SampleData itemToEdit = SampleData.GetClonedInstance(GridData.Where(itm => itm.ID == SelectedPerson.ID).FirstOrDefault());
                    currState.OriginalEditItem = itemToEdit;
                    await GridRef.SetState(currState);
                    break;
                case "ToggleSelect":
                    var selItems = SelectedItems.ToList();
                    if (SelectedItems.Contains(SelectedPerson))
                    {
                        selItems.Remove(SelectedPerson);
                    }
                    else
                    {
                        selItems.Add(SelectedPerson);
                    }
                    SelectedItems = selItems;
                    break;
                default:
                    break;
            }
        }
        SelectedPerson = null; // clean up
    }

    // generate data
    protected override void OnInitialized()
    {
        // context menu items
        MenuItems = new List<MenuItem>()
{
            new MenuItem(){ Text = "Select", Icon="checkbox-checked", CommandName="ToggleSelect" },
            new MenuItem(){ Text = "Edit", Icon="edit", CommandName="BeginEdit" },
            new MenuItem(){ Text = "Delete", Icon="delete", Action = DeleteItem }
        };

        // generate data for the grid
        GridData = new ObservableCollection<SampleData>();
        var rand = new Random();

        for (int i = 0; i < 100; i++)
        {
            GridData.Add(new SampleData()
            {
                ID = i,
                Name = "Employee " + i.ToString(),
            });
        }
    }


    // CUD operations for the grid

    async Task CreateItem(GridCommandEventArgs args)
    {
        var argsItem = args.Item as SampleData;

        // call the actual data service here

        argsItem.ID = GridData.Count + 1;

        GridData.Insert(0, argsItem);
    }

    void DeleteItem() // not async so it can be passed as an Action
    {
        var argsItem = SelectedPerson;

        // call the actual data service here

        GridData.Remove(argsItem);
    }

    async Task UpdateHandler(GridCommandEventArgs args)
    {
        var argsItem = args.Item as SampleData;

        // call the actual data service here

        var index = GridData.ToList().FindIndex(i => i.ID == argsItem.ID);
        if (index != -1)
        {
            GridData[index] = argsItem;
        }
    }

    public class SampleData
    {
        public int ID { get; set; }
        public string Name { get; set; }


        public override bool Equals(object obj)
        {
            if (obj is SampleData)
            {
                return this.ID == (obj as SampleData).ID;
            }
            return false;
        }

        public SampleData()
        {

        }

        public SampleData(SampleData itmToClone)
        {
            this.ID = itmToClone.ID;
            this.Name = itmToClone.Name;
        }

        public static SampleData GetClonedInstance(SampleData itmToClone)
        {
            return new SampleData(itmToClone);
        }
    }
}

Regards,
Marin Bratanov
Progress Telerik

Love the Telerik and Kendo UI products and believe more people should try them? Invite a fellow developer to become a Progress customer and each of you can get a $50 Amazon gift voucher.

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