Aspnetcore: Blazor: Problem with EventCallBack in Generic component

Created on 28 Nov 2019 · 5Comments · Source: dotnet/aspnetcore

Describe the bug

My event is not called in the parent component when using EventCallBack in a child component.
I've already been through #12116 and #8385 but It still not working

To Reproduce

My code:
Tree.razor (child)

@typeparam TNode
<HTML WITH DOUBLECLICK EVENT>

@code{
    [Parameter] public EventCallback<DoubleClickVariableEventArgs> OnDoubleClickOnVariable { get; set; }

private void OnDoubleClickTree(object sender, MouseEventArgs e)
    {
                Console.WriteLine("TEST");
               OnDoubleClickOnVariable.InvokeAsync(new DoubleClickVariableEventArgs(selectedNode.Path, selectedNode.IsReadOnly));}
}

"TEST" is correctly displayed in the console. so the problem is from InvokeAsync.

My eventargs:

public class DoubleClickVariableEventArgs : EventArgs
    {
        public DoubleClickVariableEventArgs(string path ,bool isReadOnly)
        {
            Path = path;
            IsReadOnly = isReadOnly;
        }
        public string Path { get; private set; }
        public bool IsReadOnly { get; private set; }

    }

MAIN.razor (parent)

<Tree  TNode="TreeItem" Nodes="Items" ChildSelector="@(item => item.Childs)" @bind-SelectedNode="selectedNode" @bind-ExpandedNodes="ExpandedNodes" HasChildNodes="@(item => item.Childs?.Any() == true)" OnDoubleClickOnVariable="OnVariableDoubleClick">
                                    <TitleTemplate>@context.Text</TitleTemplate>
                                </Tree>

@code{
 private async Task OnVariableDoubleClick(DoubleClickVariableEventArgs e)
    {
        Console.WriteLine("TEST2");
}
}

I tried some of the solutions like writing the type : TNode = "TreeItem" or writing OnDoubleClickOnVariable="(DoubleClickVariableEventArgs x) => OnVariableDoubleClick(x)" Without success...
I want to say that I used the exact same structure in another non-generic component and it's working perfectly.

Further technical details

Lastest Blazor, VS Preview versions

P.S. On of my first post on github sorry if it's unreadable

area-blazor question

Source

Flearz

👍1

Most helpful comment

I'm having the same issue...

partyelite on 18 Dec 2019

👍3

All 5 comments

@Flearz thanks for contacting us.

@rynowak can you take a look at this and see if there's an issue?

javiercn on 29 Nov 2019

👍1

I'm having the same issue...

partyelite on 18 Dec 2019

👍3

@Flearz Can you upload your reproduction to a GitHub repository?

I've tried to create a simple repro with a generic component that accepts an event callback and do see the InvokeAsync is called in my sample.

There maybe something else in your application that is causing the issue so a repro will help.

captainsafia on 8 May 2020

This issue has been automatically marked as stale because it has been marked as requiring author feedback but has not had any activity for 4 days. It will be closed if no further activity occurs within 3 days of this comment. If it is closed, feel free to comment when you are able to provide the additional information and we will re-investigate.

See our Issue Management Policies for more information.

msftbot[bot] on 12 May 2020

Thank you for contacting us. Due to a lack of activity on this discussion issue we're closing it in an effort to keep our backlog clean. If you believe there is a concern related to the ASP.NET Core framework, which hasn't been addressed yet, please file a new issue.

This issue will be locked after 30 more days of inactivity. If you still wish to discuss this subject after then, please create a new issue!

msftbot[bot] on 14 Jul 2020

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