What is the best way to handle an ajax call while working with the main Vue instance?

I have a VueJS component that makes an AJAX call to GitHub using the following code:

(Child) Component

Vue.http.get('user/repos').then((response) => {
    console.log(response);
}, (response) => {
    console.log(response);
});

The issue is that I need to obtain an access token before making this AJAX call. The access token is stored in the database, so my main Vue component makes an AJAX call to set a common header for all requests:

Main Vue Instance

Vue.http.headers.common['Authorization'] = `token ${this.token}`;

const app = new Vue({
    el: '#app',

    data: {
      token: ''
    },

    created() {
        Vue.http.get('/token').then((response) => {
            this.token = response.data.token;
        }, () => {
            console.log('Failed to retrieve the access token for the logged-in user.');
        })
    }
});

How can I ensure that the AJAX call to set the 'Authorization' header is successful before making the AJAX call from my component?

Answer №1

Sharing this valuable information for others who may find it helpful.

  1. Retrieve the token from the API call and store it in a Vuex state variable.

  2. Access the token in the child component by using a getter as a computed property, passing it via props, or through an event bus. However, utilizing Vuex is the most powerful method.

  3. Watch over the token property to perform necessary actions once the token is acquired.

    // Embed this code snippet in the child component
    
       computed: {
         ...mapGetters({
            token: <name-of-the-getter> // 'token' serves as an alias for the computed property
         })
       },
    
       watch: {
         token () {
           if(this.token) this.someAPICall()// or any other relevant condition
         }
       },
    
       methods: {
         ...mapActions({
           someAPICall: <name-of-the-action>
         })
       }
    
    // ----------------------------------------------
    

Keep in mind that watch requires the value to change; note that triggering commits within an action will activate the watch. If the token is lost or expires, subsequent requests may be impacted.

EDIT

import store from 'path/to/store'

axios.interceptors.response.use(function (response) {
  // Extract the token from the response object
  // Save the token to the store for future access during requests.
  return response;
}, function (error) {
  // Handle response error
  return Promise.reject(error);
});

axios.interceptors.request.use(function (config) {
  // Utilize store getters to retrieve the token
  return config;
}, function (error) {
  // Handle request error
  return Promise.reject(error);
});

Answer №2

If you want to customize the Vue.http.get function, you can create your own function that first fetches a token before making the request. Here is a basic outline of how you can achieve this:

!function() 
{ 
  var custom_http_get = Vue.http.get;
  var token = null;

  // Modify the Vue.http.get function
  Vue.http.get = function get() {
    custom_http_get.apply(Vue.http,"path/to/get/token/").then(function(response){
      token = response; 
      Vue.http.headers.common['Authorization'] = ...;
      // Restore the original Vue.http
      Vue.http = custom_http_get;
      return Vue.http.get(arguments[0]);
    });
  }; 
}();

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