React API Calling Guide: How to interact and transfer data with the backend API

Overview:
In modern web development, how to interact with the backend API Interaction and data transfer is a common requirement. React, as a popular front-end framework, provides some powerful tools and features to simplify this process. This article will introduce how to use React to call the backend API, including basic GET and POST requests, and provide specific code examples.

1. Install the required dependencies:
   First, make sure you have Axios installed in your project, which is a popular HTTP client for sending and receiving HTTP requests. Use the following command to install Axios:

   npm install axios

2. Send a GET request:
   Sending a GET request is one of the most common ways to get data from the backend API. In React, you can send a GET request in the component's componentDidMount lifecycle method. The following example shows how to use Axios to send a GET request and handle the response:

   import React, { Component } from 'react';
   import axios from 'axios';
   
   class MyComponent extends Component {
     componentDidMount() {
    axios.get('/api/endpoint')
      .then(response => {
        // 處理響應(yīng)數(shù)據(jù)
        console.log(response.data);
      })
      .catch(error => {
        // 錯誤處理
        console.error(error);
      });
     }
   
     render() {
    return (
      // 組件的渲染內(nèi)容
    );
     }
   }
   
   export default MyComponent;

3. Send a POST request:
   In addition to getting data, React can also use Axios to send a POST request to the backend API sends data. The following example shows how to use Axios to send a POST request and handle the response:

   import React, { Component } from 'react';
   import axios from 'axios';
   
   class MyComponent extends Component {
     handleSubmit = (event) => {
    event.preventDefault();
   
    const data = {
      // 要發(fā)送的數(shù)據(jù)
    };
   
    axios.post('/api/endpoint', data)
      .then(response => {
        // 處理響應(yīng)數(shù)據(jù)
        console.log(response.data);
      })
      .catch(error => {
        // 錯誤處理
        console.error(error);
      });
     }
   
     render() {
    return (
      <form onSubmit={this.handleSubmit}>
        {/* 表單內(nèi)容 */}
        <button type="submit">提交</button>
      </form>
    );
     }
   }
   
   export default MyComponent;

4. Handling API responses:
   Handling responses from the API may vary depending on the design of the backend API. Typically, the API's response data will be contained in the data attribute of the response. Depending on the data type returned by the backend API (JSON, plain text, etc.), the response data can be processed in an appropriate manner.
5. Error handling:
   Error handling is an important aspect when interacting with the backend API. You can use the catch method to catch requests that fail and handle the error appropriately. This may include displaying error messages to the user or logging errors.

Summary:
By using the Axios library, React components can easily interact and transmit data with the back-end API. The above example provides a basic way to send GET and POST requests and process the response data. However, this is only the basis for API calls. According to specific project needs, other functions can be added, such as handling authentication, request interception, etc.

After all, interacting with the backend API is an important part of React development, and mastering the skills of API calls will help us build more powerful and flexible web applications.

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