In the typical React dataflow, props are the only way that parent components interact with their children. To modify a child, you re-render it with new props. However, there are a few cases where you need to imperatively modify a child outside of the typical dataflow. React Router is a lightweight, fully-featured routing library for the React JavaScript library. The child to be modified could be an instance of a React component, or it could be a DOM element. React Router runs everywhere that React runs on the web, on the server (using node.js), and on React Native. If youre new to React Router, we recommend you start with the getting started guide. If youre migrating to v6 from v5 (or v4, which is the same as v5), check out the migration guide. Managing focus, text selection, or media playback.įor both of these cases, React provides an escape hatch.Integrating with third-party DOM libraries.Īvoid using refs for anything that can be done declaratively.įor example, instead of exposing open() and close() methods on a Dialog component, pass an isOpen prop to it.Your first inclination may be to use refs to “make things happen” in your app. If this is the case, take a moment and think more critically about where state should be owned in the component hierarchy. Often, it becomes clear that the proper place to “own” that state is at a higher level in the hierarchy. See the Lifting State Up guide for examples of this. The examples below have been updated to use the React.createRef() API introduced in React 16.3. If you are using an earlier release of React, we recommend using callback refs instead. Refs are created using React.createRef() and attached to React elements via the ref attribute. Refs are commonly assigned to an instance property when a component is constructed so they can be referenced throughout the component.Ĭlass CustomTextInput extends React. In the example above, Parent passes its ref callback as an inputRef prop to the CustomTextInput, and the CustomTextInput passes the same function as a special ref attribute to the. As a result, this.inputElement in Parent will be set to the DOM node corresponding to the element in the CustomTextInput. If you worked with React before, you might be familiar with an older API where the ref attribute is a string, like "textInput", and the DOM node is accessed as. We advise against it because string refs have some issues, are considered legacy, and are likely to be removed in one of the future releases. If you’re currently using to access refs, we recommend using either the callback pattern or the createRef API instead. That means that the docs might contain errors, please use the official docs.Feel free to help out, just send the PR with suggested changes. If the ref callback is defined as an inline function, it will get called twice during updates, first with null and then again with the DOM element. This is because a new instance of the function is created with each render, so React needs to clear the old ref and set up the new one.
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