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3 years ago
using Microsoft.JSInterop;
namespace Razor;
// This class provides an example of how JavaScript functionality can be wrapped
// in a .NET class for easy consumption. The associated JavaScript module is
// loaded on demand when first needed.
//
// This class can be registered as scoped DI service and then injected into Blazor
// components for use.
public class ExampleJsInterop : IAsyncDisposable
{
private readonly Lazy<Task<IJSObjectReference>> moduleTask;
public ExampleJsInterop(IJSRuntime jsRuntime)
{
moduleTask = new(() => jsRuntime.InvokeAsync<IJSObjectReference>(
"import", "./_content/Razor/exampleJsInterop.js").AsTask());
}
public async ValueTask<string> Prompt(string message)
{
var module = await moduleTask.Value;
return await module.InvokeAsync<string>("showPrompt", message);
}
public async ValueTask DisposeAsync()
{
if (moduleTask.IsValueCreated)
{
var module = await moduleTask.Value;
await module.DisposeAsync();
}
}
}