How to monitor the completion of table data loading ?

Question

How to monitor the completion of table data loading ?

929Free 601

hello, I want to perform some tasks after loading data in the table. How should I proceed?

for example :

    <table class="table">
        <thead>
            <tr>
                <th>Date</th>
                <th aria-label="Temperature in Celsius">Temp. (C)</th>
                <th aria-label="Temperature in Farenheit">Temp. (F)</th>
                <th>Summary</th>
            </tr>
        </thead>
        <tbody>
            @foreach (var forecast in forecasts)
            {
                <tr>
                    <td>@forecast.Date.ToShortDateString()</td>
                    <td>@forecast.TemperatureC</td>
                    <td>@forecast.TemperatureF</td>
                    <td>@forecast.Summary</td>
                </tr>
            }
        </tbody>
    </table>
}

Weather.razor :


@code {
    private WeatherForecast[]? forecasts;

    protected override async Task OnInitializedAsync()
    {
        // Simulate asynchronous loading to demonstrate a loading indicator
        await Task.Delay(500);

        var startDate = DateOnly.FromDateTime(DateTime.Now);
        var summaries = new[] { "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching" };
        forecasts = Enumerable.Range(1, 5).Select(index => new WeatherForecast
        {
            Date = startDate.AddDays(index),
            TemperatureC = Random.Shared.Next(-20, 55),
            Summary = summaries[Random.Shared.Next(summaries.Length)]
        }).ToArray();
    }

    private class WeatherForecast
    {
        public DateOnly Date { get; set; }
        public int TemperatureC { get; set; }
        public string? Summary { get; set; }
        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
    }
}

Can you monitor the loading and rendering of forecasts ? thanks

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Answer 1

Hi 929Free

Thank you for reaching out to Microsoft Q & A forum.

To perform an action after the table data has finished loading and rendering, you can use the OnAfterRenderAsync lifecycle method along with a flag to detect when data loading has just completed. Here's a simplified example:

@code {
    private WeatherForecast[]? forecasts;
    private bool dataJustLoaded;
    protected override async Task OnInitializedAsync()
    {
        await Task.Delay(500); // Simulate data loading
        forecasts = GetForecasts();
        dataJustLoaded = true;
    }
    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (dataJustLoaded)
        {
            dataJustLoaded = false;
            await HandlePostRenderLogic();
        }
    }
    private Task HandlePostRenderLogic()
    {
        Console.WriteLine("Table has been rendered.");
        return Task.CompletedTask;
    }
    private WeatherForecast[] GetForecasts() => Enumerable.Range(1, 5).Select(i =>
        new WeatherForecast
        {
            Date = DateOnly.FromDateTime(DateTime.Now.AddDays(i)),
            TemperatureC = 20
        }).ToArray();
    private class WeatherForecast
    {
        public DateOnly Date { get; set; }
        public int TemperatureC { get; set; }
        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
    }
}

This approach ensures that any logic you wish to execute after the table has rendered runs only once, immediately following data load and render completion.

If you have found the answer provided to be helpful, please click on the "Accept answer/Upvote" button so that it is useful for other members in the Microsoft Q&A community.

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How to monitor the completion of table data loading ?

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