![]() 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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