Unplanned
Last Updated: 16 Apr 2021 08:37 by ADMIN
MurugappanMeyyappan
Created on: 16 Apr 2021 08:37
Category: Grid
Type: Bug Report
1
Skip is not fully correct when restoring state in OnStateInit with a filtered and sorted grid using a remote data service through OnRead

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ADMIN EDIT

At the end of this post you can find the two most common scenarios that can exhibit this problem, and a video that illustrates it.

A potential workaround could be to avoid the second call to onread because that's where the problem lies, with code similar to this:

 

    int readCounts { get; set; }
    protected async Task ReadItems(GridReadEventArgs args)
    {
        if (readCounts != 1) // the second call is skipped - that's where the problem lies
        {
            Console.WriteLine("ONREAD with skip " + args.Request.Skip);
            HttpResponseMessage response = await Http.PostAsJsonAsync("WeatherForecast", args.Request);

            if (response.StatusCode == System.Net.HttpStatusCode.OK)
            {
                DataEnvelope<WeatherForecast> envelope = await response.Content.ReadFromJsonAsync<DataEnvelope<WeatherForecast>>();

                GridData = envelope.CurrentPageData;
                Total = envelope.TotalItemCount;

                StateHasChanged();
            }
        }
        readCounts++;
    }

 

where you may need to extend this a little to also use a flag for whether there was state loaded at all - if there wasn't, then the OnRead call may want to continue because it could be a legitimate user action. Whether this is needed is up to the app and whether your users already have a state saved (if you use OnStateChanged to save the state, they probably already do).

Another possible workaround is to always save Skip=0 in the state so that the user always starts at the top of the grid rather than juuust slightly off from where they expect.

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