为 table 的每一行呈现上下文菜单

Question

我想为 table 的每一行附加一个事件处理程序。当用户右键单击 row 时，我想在该行旁边打开一个小模式。现在为了做到这一点，我不知道如何让选定的 row.The 文档显示 UIMouseEventArgs 为 used.I 看到它只有一个参数 Type 我认为是mousedown 或 mouseover...等（鼠标事件的类型）。

如何获取用户右击的行？

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();


        }


    }

模态

@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; }

    }

使用上面的代码我可以打印文本，但是如果我尝试渲染组件我会收到错误消息：

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

试试这个：

在您的 OnMousePressed 方法中检查单击了哪个按钮。

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

至于发现点击了哪一行，您可以将 ca.Id 的值传递给您的 OnMousePressed 方法并用它做一些事情。

为 table 的每一行呈现上下文菜单

Rendering contextmenu for each row of a table

c#

mouseevent

blazor