Error handling and data request retry mechanism of Vue and Axios

Error handling and data request retry mechanism of Vue and Axios

In web development, data request and error handling are an essential part. Vue is a JavaScript framework for building user interfaces, while Axios is a Promise-based HTTP client library that supports browsers and Node.js. This article will introduce how to use Axios to make data requests in Vue, and implement error handling and data request retry functions.

Introducing Axios and configuration

First, we need to introduce Axios into the Vue project. You can use NPM or directly introduce CDN resources. The following is an example of using NPM to introduce Axios:

npm install axios

Then, import Axios in the main.js file of the Vue project and configure it:

import Vue from 'vue'
import axios from 'axios'

Vue.prototype.$axios = axios
axios.defaults.baseURL = 'http://api.example.com'

In the above code, We use Axios as the prototype property of Vue $axios to facilitate use in various components of Vue. And the default request address is set to http://api.example.com.

Initiate data request

In the Vue component, we can use the $axios object to initiate a data request. The following is a simple example:

<template>
  <div>
    <button @click="fetchData">Fetch Data</button>
    <div v-if="loading">Loading...</div>
    <div v-else-if="error">Error: {{ error }}</div>
    <ul v-else>
      <li v-for="item in data" :key="item.id">{{ item.name }}</li>
    </ul>
  </div>
</template>

<script>
export default {
  data() {
    return {
      data: null,
      error: null,
      loading: false
    }
  },
  methods: {
    fetchData() {
      this.loading = true
      this.error = null

      this.$axios
        .get('/data')
        .then(response => {
          this.data = response.data
        })
        .catch(error => {
          this.error = error.message
        })
        .finally(() => {
          this.loading = false
        })
    }
  }
}
</script>

In the above code, we define a method fetchData for obtaining data. When the "Fetch Data" button is clicked, this method will be executed and a GET request will be initiated. The requested path /data is specified through the $axios.get method, and the .then and .catch methods are used to handle the response success and Failure situation. Finally, use the .finally method to reset the loading status to false.

Error handling

In the above example, we handle the request failure through the .catch method and save the error information in error in variables. At the same time, we set the loading status to false so that the error message is displayed on the page.

In addition to using the .catch method, Axios also provides other ways to handle errors. For example, you can use axios.interceptors to intercept all requests and responses, and then perform unified error handling:

axios.interceptors.response.use(
  response => response,
  error => {
    // 处理请求错误
    return Promise.reject(error)
  }
)

In the above code, we use axios.interceptors.response. use method to intercept all responses. If an error occurs, it can be handled in the error callback function.

Data request retry

Sometimes, our data request may fail due to network and other reasons. At this time, the data request retry mechanism can be used for automatic retry.

Axios provides the axiosRetry plug-in to implement data request retry. First, we need to install axios-retry:

npm install axios-retry

Then, import and configure axiosRetry in the main.js file of the Vue project:

import axios from 'axios'
import axiosRetry from 'axios-retry'

axiosRetry(axios, { retries: 3 })

In the above code, we configured the maximum number of retries to 3 times. When a request fails, Axios automatically retries.

Summary

This article introduces the method of using Axios to make data requests in Vue, and implements the functions of error handling and data request retry. By flexibly using Axios' APIs and plug-ins, we can better control the data request process and provide a better user experience. In actual development, it can be expanded and optimized as needed to meet the needs of the project.

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