Rendering contextmenu for each row of a table

Question

I want to attach an event handler for each row of a table. When the user right-clicks on a row , i want to open a small modal next to that row. Now in order to do this i do not know how to get the selected row.The documentation shows UIMouseEventArgs to be used.I see it has only one paramter Type which i assume is either mousedown or mouseover...etc (the type of the mouse event).

How do i get the row on which the user right-clicked?

Table

    @inherits DashboardBase
    @foreach (var ca in this.campaigns) {
                    <tr id="@ca.Id" onmousedown="@(async(ev)=>await OnClick(ev,ca))">
                        <td >@ca.Id</td>
                        <td>@ca.Name</td>
                        <td>@ca.State.Tag</td>
                        <td>@ca.CreatedAtUtc</td>
                        <td>@ca.IsPaused</td>
                        @if (this.SelectedId == ca.Id) {
                            <td><ModalHelper info="@ca"></ModalHelper></td>
                            @"test string"
                        }

                    </tr>
                }

 public class DashboardBase : BlazorComponent {

        protected long SelectedId = -1;
        [Parameter]
        protected Campaign.Dto.CampaignInfo[] campaigns { get; set; }
        protected  void OnClick(UIMouseEventArgs args,CampaignInfo campaign) {
            if (args.Button != 2) {

                return;
            }
            Console.WriteLine("You pressed right on campaignID:" + campaign.Id);
            this.SelectedId = campaign.Id;
            this.StateHasChanged();


        }


    }

Modal

@inherits ModalHelperBase
<div>
    <button onclick="@(async()=>await OnDeletePressedAsync())">Delete</button>
</div>


public class ModalHelperBase:BlazorComponent {
        [Inject]
        private CampaignService campaignService { get; set; }
        [Parameter] protected CampaignInfo info { get; set; }

    }

Using the code above i can print a text , but if i try to render the component i get the error :

blazor.server.js:23 Uncaught (in promise) Error: System.ArgumentException: There is no event handler with ID 7
   at Microsoft.JSInterop.DotNetDispatcher.InvokeSynchronously(String assemblyName, String methodIdentifier, Object targetInstance, String argsJson)
   at Microsoft.JSInterop.DotNetDispatcher.BeginInvoke(String callId, String assemblyName, String methodIdentifier, Int64 dotNetObjectId, String argsJson)
    at endInvokeDotNetFromJS (blazor.server.js:23)

Answer 1

Try this:

In your OnMousePressed method check which button was clicked.

if ( args.Button == 2) // right button clicked
{ 
   // Code to display your dialogbox
}

As for discovering which row was clicked, you can pass to your OnMousePressed method the value of ca.Id and do something with it.