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5
Votes

Spinner is not showing when used in OnAfterRenderAsync()

I planned to use the spinner to indicate that a relative long running service is being called. This service is called the moment the page opens (using the OnAfterRenderAsync() method). See the code below:

@code {
    SfSpinner SpinnerObj;

    protected async override Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            await StartLongRunningServiceCall();
        }
        await base.OnAfterRenderAsync(firstRender);
    }

    private async Task StartLongRunningServiceCall()
    {
        //await Task.Delay(1000); <= remove remark to get it working
        SpinnerObj.ShowSpinner("#container");

        // simulate long running call
        await Task.Delay(2500);

        SpinnerObj.HideSpinner("#container");
    }
}

The only way to get is working is to wait for a second (or so) before I show the spinner.

Is this a bug? Or am I using the spinner wrong?