![]() ![]() This method is useful for reading values out of the DOM, such as form field values and performing DOM measurements. If this component has been mounted into the DOM, this returns the corresponding native browser DOM element. To learn how to do this without getting the markup mismatch issues, refer to the explanation in the previous paragraph. However, if executed well, it may be beneficial to render a “shell” of the application on the server, and only show some of the extra widgets on the client. The JavaScript code may load significantly later than the initial HTML render, so if you render something different in the client-only pass, the transition can be jarring. Remember to be mindful of user experience on slow connections. Note that this approach will make your components slower because they have to render twice, so use it with caution. This way the initial render pass will render the same content as the server, avoiding mismatches, but an additional pass will happen synchronously right after hydration. Components that render something different on the client can read a state variable like, which you can set to true in componentDidMount(). If you intentionally need to render something different on the server and the client, you can do a two-pass rendering. Unless it’s text content, React still won’t attempt to patch it up, so it may remain inconsistent until future updates. It only works one level deep, and is intended to be an escape hatch. If a single element’s attribute or text content is unavoidably different between the server and the client (for example, a timestamp), you may silence the warning by adding suppressHydrationWarning= to the element. This is important for performance reasons because in most apps, mismatches are rare, and so validating all markup would be prohibitively expensive. There are no guarantees that attribute differences will be patched up in case of mismatches. In development mode, React warns about mismatches during hydration. It can patch up differences in text content, but you should treat mismatches as bugs and fix them. React expects that the rendered content is identical between the server and the client. React will attempt to attach event listeners to the existing markup. Same as render(), but is used to hydrate a container whose HTML contents were rendered by ReactDOMServer. Hydrate has been replaced with hydrateRoot in React 18. Using render() to hydrate a server-rendered container is deprecated. If you need a reference to the root ReactComponent instance, the preferred solution is to attach a ![]() However, using this return value is legacyĪnd should be avoided because future versions of React may render components asynchronously in some cases. Render() currently returns a reference to the root ReactComponent instance. It may be possible to insert a component to an existing DOM node without overwriting the existing children. Render() does not modify the container node (only modifies the children of the container). Later calls use React’s DOM diffing algorithm for efficient updates. Any existing DOM elements inside are replaced when first called. Render() controls the contents of the container node you pass in. If the optional callback is provided, it will be executed after the component is rendered or updated. If the React element was previously rendered into container, this will perform an update on it and only mutate the DOM as necessary to reflect the latest React element. Render a React element into the DOM in the supplied container and return a reference to the component (or returns null for stateless components). Render has been replaced with createRoot in React 18.
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