How to use jquery in react

React is an open source JavaScript library developed by Facebook for building user interfaces. It adopts a component-based development model, which allows developers to split the UI into independent, reusable components and update each component as needed, thereby improving the maintainability and reusability of the code. jQuery is a JavaScript library that provides a simpler API to operate HTML documents, handle events, create animations, implement AJAX and other functions. This article will explore ways to use jQuery in React.

There are two main ways to use jQuery in React projects:

1. Use npm to install jQuery, and then introduce it into the component

First, you need to Use npm to install jQuery in the terminal. The command is as follows:

npm install jquery --save

After the installation is completed, introduce it into the component that needs to use jQuery as follows:

import $ from 'jquery';

Then you can add it to the component's life cycle function Use jQuery's API to perform regular DOM operations. For example, you can bind a click event to a button through the following code after the component is rendered:

componentDidMount() {
  $(this.refs.myBtn).on('click', function() {
    console.log('button clicked');
  });
}

It should be noted that since React uses virtual DOM, if you directly use jQuery to change the DOM, React will The state and DOM are not synchronized, so the setState method provided by React should be used to change the state, and then React will re-render the page.

2. Introduce the jQuery library in public/index.html

If the jQuery library has been introduced in public/index.html when the project is created, then in the component You can directly use the $ symbol to perform jQuery operations without additional introduction and installation.

For example, the following code can bind the click event to the button after the component is rendered:

componentDidMount() {
  $(this.refs.myBtn).on('click', function() {
    console.log('button clicked');
  });
}

It should be noted that although this method seems more convenient, it is not suitable for React applications. It's best not to use this approach because it bypasses React's virtual DOM.

Summary:

React and jQuery are two completely different libraries. They are designed for the different needs of front-end developers. They can replace each other in most cases, but they do not Equivalent. However, in some specific cases, such as when complex operations on the DOM need to be performed, using jQuery may be more convenient. When using jQuery in React, please note that although you can use jQuery's API for regular DOM operations, in order not to destroy the component-based features of React, you should use the setState method provided by React to change the state and re-render the page whenever possible.

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