1. UseState usage rules 1. The useState function can be executed multiple times. Each execution is independent of each other. Each call provides a state for the function component. 2. useState can only appear in [Function Component] or other hook functions 3. It cannot be nested in if/for/other functions (react recognizes each hook according to […]
Tag: setstate
react data management setState and Props
react data management setState and Props setState calling principle setState is a method in React used to update component state. Its calling principle can be divided into the following steps: State change: When setState is called, React will merge the new state object with the current state object (the merging process is a shallow merge). […]
React’s setState principle and performance optimization SCU
1. setState function There is a huge difference between react and vue in the public state assignment. Vue can directly obtain the public state of the current instance through this and assign the value directly. React cannot directly modify the value of state to update the interface. It modifies the public state through the setState […]
react data management setState and Props
setState calling principle setState is a method in React used to update component state. Its calling principle can be divided into the following steps: State change: When setState is called, React will merge the new state object with the current state object (the merging process is a shallow merge). React does not directly modify the […]
Is setState synchronous or asynchronous?
Hello, if you like my articles, you can follow my public account “Quantum Front End” and I will follow and push good front-end articles from time to time~ The following content is for React versions below v18. Foreword Is setState synchronous or asynchronous? Many people may have been asked this question in interviews, like this […]
Bug Resolved – Warning: Cant call setState (or forceUpdate) on an unmounted component (React)
Blogger Maotouhu () takes you to Go to New World? Blog homepage: Maotouhu’s blog “Complete Column of Interview Questions” Articles with pictures and texts Vivid images Simple and easy to learn! Everyone is welcome to step in~ “IDEA Development Cheats Column” Learn the common operations of IDEA and double your work efficiency~ “Master Golang in […]
Bug Resolved – TypeError: Cannot read property setState of undefined (React)
Blogger Maotouhu () takes you to Go to New World? Blog homepage: Maotouhu’s blog “Complete Column of Interview Questions” Articles with pictures and texts Vivid images Simple and easy to learn! Everyone is welcome to step in~ “IDEA Development Cheats Column” Learn the common operations of IDEA and double your work efficiency~ “Master Golang in […]
Summary of C++ ostream flow functions good, eof, fail, bad, operator!, operator bool, rdstate, setstate, clear, copyfmt (209)
Introduction: CSDN blog expert, focusing on Android/Linux System, share multi-mic voice solutions, audio and video, codec and other technologies, and grow with everyone! Quality Column:Audio Engineer Advanced Series[Original information is being updated continuously… ] Life motto: There are never shortcuts in life, only actions It is the only cure for fear and laziness. For more […]
Analysis of setState execution process in Flutter
In Flutter, when you call the setState method, the Flutter framework will be rebuilt in the next frame and trigger the rendering process. Flutter uses its own rendering engine for drawing and rendering. Trigger the setState method: When the setState method is called, the setState method will be called in the State class @protected void […]
React [event object, component relationship (component props, sub-component passing data to parent component), component combination (component state State, State update, setState re-rendering component and sub-component, initialization based on props)] (2)
Article Table of Contents event object Event handler passes parameters Function components and class components Component relationships Component props Child component passes data to parent component Component combination Component stateState State update setState re-renders components and sub-components Initialize state based on props Event Object By default, react will pass an event object to the event […]