![]() The preceding example pollutes the client with global methods. "setElementText2", divElement, "Hello from interop call!") Protected override async Task OnAfterRenderAsync(bool firstRender) Get value via JS interop ? "No value yet") The code doesn't create an infinite loop because StateHasChanged is only called when data is null. StateHasChanged is called to rerender the component with the new state obtained from the JS interop call (for more information, see ASP.NET Core Razor component rendering). Where JSRuntime.InvokeAsync is called, the ElementReference is only used in OnAfterRenderAsync and not in any earlier lifecycle method because there's no JS element until after the component is rendered. For more information, see ASP.NET Core Blazor JavaScript interoperability (JS interop). Directly modifying the DOM with JS isn't recommended in most scenarios because JS can interfere with Blazor's change tracking. The preceding example modifies the DOM directly for demonstration purposes only. Public void Dispose() => jsClass?.Dispose() įor dynamic content generation with BuildRenderTree, use the attribute: The JS function accepts a byte array from a C# method, decodes the array, and returns the text to the component for display. The example demonstrates how to invoke a JS function from a C# method that offloads a requirement from developer code to an existing JS API. The following example is based on TextDecoder, a JS-based decoder. For more information, see the Prerendering section. InvokeAsync unwraps the Promise and returns the value awaited by the Promise.įor Blazor apps with prerendering enabled, which is the default for server-side apps, calling into JS isn't possible during prerendering. A JS Promise is returned for InvokeAsync methods.NET type that best maps to the JSON type returned. The TValue return type must also be JSON serializable.TimeSpan represents a time limit for a JS operation.The cancellation token ( CancellationToken) propagates a notification that operations should be canceled.Pass any number of JSON-serializable arguments in Object to a JS function.There's no need to register the function before it's called. To call, the identifier is someScope.someFunction. The function identifier ( String) is relative to the global scope ( window).NET, inject the IJSRuntime abstraction and call one of the following methods:įor the preceding. IJSRuntime is registered by the Blazor framework. Blazor script start configuration is found in Pages/_Host.cshtml. The Server project of a hosted Blazor WebAssembly app.Blazor script start configuration is found in the.The Client project of a hosted Blazor WebAssembly app.Create custom folders based on component functionality as needed. Non-routable shared components are placed in the server project's Components folder. Only routable Server render mode components with an directive are placed in the Components/Pages folder. Blazor script start configuration is found in the App component ( Components/App.razor). The Program file is Program.cs of the server project. Server/ server-side: Interactive server rendering of a Blazor Web App. ![]() Blazor script start configuration is found in the Client project or in custom folders based on component functionality. Place non-routable shared components at the root of the. Routable WebAssembly and Auto render mode components with an directive are placed in the client project's Pages folder. Blazor script start configuration is found in the App component ( Components/App.razor) of the server project. ![]() The Program file is Program.cs of the client project (.
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