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Building Real-Life Applications with Blazor WebAssembly

InvokeAsync

Explore how to use the InvokeAsync method of IJSRuntime in Blazor to call JavaScript functions asynchronously. Understand how to retrieve and use JavaScript return values within a Blazor component, demonstrated through a window size example.

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The InvokeAsync method is used when we want to call a JavaScript function that returns a value. It invokes the specified JavaScript function asynchronously.

This is the InvokeAsync method of IJSRuntime:

C#
ValueTask<TValue> InvokeAsync<TValue>(string identifier, params object[] args);

Just like the InvokeVoidAsync method, the first argument is the identifier for the JavaScript method, and the second argument ...