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How to use forceupdate in react

2025-01-25 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >

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In this article, the editor introduces in detail "how to use forceupdate in react". The content is detailed, the steps are clear, and the details are handled properly. I hope this article "how to use forceupdate in react" can help you solve your doubts.

In react, forceupdate () is used to force the component to skip shouldComponentUpdate () and directly call render (), which can trigger the component's normal life cycle method with the syntax of "component.forceUpdate (callback)".

The operating environment of this tutorial: Windows10 system, react17.0.1 version, Dell G3 computer.

What is the use of forceupdate in react

Components in React re-render only when the state of the component or the props passed to it changes, but if some data changes, if we need to change the re-render of the component, we will use the forceUpdate () method of React. Calling forceUpdate () forces the component re-render, skipping the shouldComponentUpdate () method and calling the component's render () method.

Tip: in general, avoid using forceUpdate () and read only from this.props and this.state in render ().

Usage:

Component.forceUpdate (callback)

Although there are some use cases that use the forceUpdate () method, it is best to use hooks, props, state, and context to re-render components when needed.

By default, the component renders again when its state or props changes. If your render () method depends on some other data, you can tell the React component that it needs to re-render by calling forceUpdate ().

Calling forceUpdate () causes the component to skip shouldComponentUpdate () and call render () directly. This triggers the normal lifecycle method of the component, including the shouldComponentUpdate () method for each subcomponent.

ForceUpdate is re-render. Some variables are not on state, and when you want to update this variable, refreshing a variable in render; or state is so deep that render is not automatically triggered when updating. At these times, you can manually call forceUpdate to automatically trigger render.

Sub.jsclass Sub extends React.Component {construcotr () {super (); this.name = "yema";} refChangeName (name) {this.name = name; this.forceUpdate ();} render () {return ({this.name});}} App.jsclass App extends React.Component {handleClick () {this.subRef.refChangeName ("yemafuren") } render () {return ({this.subRef = sub;}} / > click);}} read here, this article "how to use forceupdate in react" has been introduced. If you want to master the knowledge of this article, you still need to practice and use it before you can understand it. If you want to know more about related articles, please follow the industry information channel.

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