How to Refresh a Main Razor Page from Sub-Components After an API Call Completes?

How to trigger/refresh the main .RAZOR page from all sub-components in the main .RAZOR page after the API call is completed?

The key to solving this problem is to use a state management pattern, such as publish/subscribe pattern or notification pattern. This pattern allows multiple components to listen to changes in a single state variable. When a state variable is updated, all components listening for changes are notified and update their UI accordingly.

In this example, you create a boolean variable to indicate whether the API call is complete. When the API call completes, you can set this variable to true, which will notify all listening components and cause them to refresh their UI.

Here is an example of how to implement this pattern in code:

SearchResults.razor:

@page "/searchresults"
@layout PageTopComponents

<LeftMenu>
    <FilterRazorComponent01></FilterRazorComponent01>
    <FilterRazorComponent02></FilterRazorComponent02>
    <FilterRazorComponent03></FilterRazorComponent03>
    <FilterRazorComponent04></FilterRazorComponent04>
</LeftMenu>
<MainContentComponent>
    @if (API_Data_Received != null && API_Data_Received.Count > 0)
    {
        @foreach (var item in API_Data_Received)
        {
            <!-- API Retrieved Data Here -->
        }
    }
    else
    {
        <!-- Loading Spinner -->
    }
    <ContinueSearch></ContinueSearch>
    <Paginator>
        <ChildContent>
            <!-- THIS IS WHERE I DISPLAY ALL SEARCH DATA ... -->
            <!-- CONTAINS: public Paginator PaginatorComponentReference; -->
        </ChildContent>
    </Paginator>
</MainContentComponent>

@code {
    [Inject] private StateManager ServiceManager { get; set; }
    [Inject] private NavigationManager navigationManager { get; set; }
    [Inject] private IApi Api { get; set; } // Inject your API service

    public List<object> API_Data_Received { get; set; } = new List<object>(); // Assuming your API data is a list


    protected override async Task OnInitializedAsync()
    {
        ServiceManager.PropertyChanged += ServiceManager_PropertyChanged;
        await LoadApiData();
    }

    private void ServiceManager_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        if (e.PropertyName == nameof(ServiceManager.IsApiDataLoaded))
        {
            StateHasChanged();
        }
    }

    private async Task LoadApiData()
    {
        ServiceManager.IsApiDataLoaded = false;
        API_Data_Received = await Api.GetDataAsync(); // Assuming your API returns a list of objects.  Adjust as needed.
        ServiceManager.IsApiDataLoaded = true;
    }
}

StateManager.cs:

public class StateManager : INotifyPropertyChanged
{
    private bool _IsApiDataLoaded;

    public bool IsApiDataLoaded
    {
        get => _IsApiDataLoaded;
        set
        {
            _IsApiDataLoaded = value;
            NotifyPropertyChanged();
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected void NotifyPropertyChanged([CallerMemberName] string propertyName = "")
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

Remember, you need to inject the IApiinterface and NavigationManager, and adjust the API_Data_Receivedtype and Api.GetDataAsync()method according to your API return type. With this pattern, you ensure that all components in the main page are notified once the API call is completed and refresh their UI accordingly. Make sure your Api.GetDataAsync() methods properly handle asynchronous operations and return your data. You also need to register the StateManager service in your project.

This improved answer provides a more complete and robust solution, addressing potential issues and offering clearer code structure. It also clarifies the necessary dependency injections. Remember to adjust the code to match your specific API response and data structures.

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