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I am making a chatroom App by the blazor server-side.
I want to show the online state of each user.
Now I can use the OnAfterRenderAsync event to get a user has entered the page.
It seems there is not any exit event in blazor lifecycle via https://learn.microsoft.com/en-us/aspnet/core/blazor/lifecycle?view=aspnetcore-3.1
Someone said I can use the Dispose event to achieve it while it does work at all.
What's more, I have a crazy idea that using the window.onbeforeunload event of js to invoke the blazor method.
I have no idea which one is best. Would you please give me a suggestion? Thank you.
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In a new Blazor app, edit the /Pages/Counter. razor file and add a new callback parameter. This declares a new EventCallback named OnMultipleOfThree that any consuming component can register an interest in. The <int> specifies that the value emitted by the event callback will be a System.
Inject NavigationManager in razor. Use Uri from NavigationManager to get the current URL.
Adding a button onclick event The first thing we need to is to create a NewComment property. This will store the textarea value. We then need to bind our NewComment property to the textarea value. We do that by using the @bind attribute.
You should implement a CircuitHandler on the server for this.
You can find the documentation here https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.components.server.circuits.circuithandler?view=aspnetcore-3.1
It enables you to react to lifecycle events for the Circuit, which is the backbone of a Blazor Server connection.
OnCircuitClosedAsync(Circuit, CancellationToken)
Invoked when a new circuit is being discarded.
OnCircuitOpenedAsync(Circuit, CancellationToken)
Invoked when a new circuit was established.
OnConnectionDownAsync(Circuit, CancellationToken)
Invoked when a connection to the client was dropped.
OnConnectionUpAsync(Circuit, CancellationToken) Invoked when a connection to the client was established. - This method is executed once initially after OnCircuitOpenedAsync(Circuit, CancellationToken) and once each for each reconnect during the lifetime of a circuit.
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