![]() ![]() Directly modifying the DOM with JavaScript isn't recommended in most scenarios because JavaScript can interfere with Blazor's change tracking. The preceding example modifies the Document Object Model (DOM) directly for demonstration purposes only. tElementText1 = (element, text) => element.innerText = text The function is called with JSRuntimeExtensions.InvokeVoidAsync and doesn't return a value: Components may need to render differently when prerendered.įor the following example, the setElementText1 function is placed inside the element of (Blazor Server). While an app is prerendering, certain actions, such as calling into JavaScript, aren't possible. Prerendering is covered in Prerender and integrate ASP.NET Core Razor components. This section applies to Blazor Server and hosted Blazor WebAssembly apps that prerender Razor components. Public void Dispose() => jsClass?.Dispose() įor dynamic content generation with BuildRenderTree, use the attribute: ĭetect when a Blazor Server app is prerendering The JS function accepts a byte array from a C# method, decodes the array, and returns the text to the component for display.Īdd the following JS code inside the closing tag of (Blazor Server): 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 Detect when a Blazor Server app is prerendering section. JS interop calls must be deferred until after the connection with the browser is established. InvokeAsync unwraps the Promise and returns the value awaited by the Promise.įor Blazor Server apps with prerendering enabled, calling into JS isn't possible during initial prerendering.
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