How to detect user's inactiveness in Blazor server app

Hi @Balu Raju ,

You can use JavaScript onmousemove and onkeypress events to trigger the Timer function in a Razor component can identify whether a user is active or inactive.

Refer to the follow sample and steps:

1. Create a new Asp.net 6 Blazor Server application and select the Individual Accounts Authentication Type.
2. In the _Layout.cshtml page, add the following scripts at the bottom of the body. 245299-javascript.txt
   
3. In the MainLayout.razor component, setting the timer.

   @using System.Timers  
   @inherits LayoutComponentBase  
   @inject NavigationManager UriHelper  
   @inject IJSRuntime JSRuntime  
   <PageTitle>BlazorServerAutoLogout</PageTitle>  
   
   <div class="page">  
       <div class="sidebar">  
           <NavMenu />  
       </div>  
   
       <main>  
           <div class="top-row px-4 auth">  
               <LoginDisplay />  
               <a href="https://learn.microsoft.com/aspnet/" target="_blank">About</a>  
           </div>  
   
           <article class="content px-4">  
               @Body  
           </article>  
       </main>  
   </div>  
   @code {  
       [CascadingParameter]  
       private Task<AuthenticationState> stateAuthenticate { get; set; }  
       private Timer timerObj;  
   
       protected override async Task OnInitializedAsync()  
       {  
       }  
       protected override async Task OnAfterRenderAsync(bool firstRender)  
       {  
           if (firstRender)  
           {  
               // Set the Timer delay.  5000 milliseconds, you can change it to 10 mins.  
               timerObj = new Timer(5000);  
               timerObj.Elapsed += UpdateTimer;  
               timerObj.AutoReset = false;  
               // Identify whether the user is active or inactive using onmousemove and onkeypress in JS function.  
               await JSRuntime.InvokeVoidAsync("timeOutCall", DotNetObjectReference.Create(this));  
               //StateHasChanged();  
           }  
       }  
        [JSInvokable]  
        public void TimerInterval()  
        {  
            // Resetting the Timer if the user in active state.  
            timerObj.Stop();  
            // Call the TimeInterval to logout when the user is inactive.  
            timerObj.Start();  
        }  
   
        private void UpdateTimer(Object source, ElapsedEventArgs e)  
        {  
            InvokeAsync(async() => {  
                // Log out when the user is inactive.  
                var authstate = await stateAuthenticate;  
                if (authstate.User.Identity.IsAuthenticated)  
                {  
                    UriHelper.NavigateTo("/Identity/Account/LogOut", true);  
                }  
            });  
        }  
    }   
   

4. In the LogOut.cshtml page(you can find it from the Identity Areas), since we are using the NavigateTo method, we have to add the OnGet method to logout.

The output as below: after 5 seconds, it will auto logout. You can change the timer the the MainLayout.razor component

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Best regards,
Dillion

I agree with HeMan. when the marketing Hype for Blazor is to leverage what I know already better , which in my case it is C# I should be able to do this without my unfavorable JS. I also understand blazor does not work without JS, that is for the underlying plumbing work, which I do not need to worry about as I'm going to leverage what I know in C#. I just do not want to write JS Code or try not to as much as possible when I design my app with Blazor, whether it is web assembly or server or hybrid. So I expect to do things in C# what I want to do rather than in JS.

Is there a way to without adding the Javascript code?