如何使用axios从vuex中的API获取数据？

Question

我从API laravel获取数据，这是我在state.js

中的代码

import axios from 'axios'
import {apiPostGet} from '../api/api'
export default {
  data: axios({
    method: 'GET',
    url: apiPostGet('Kategori')
  }).then(
    response => {
      return response.data.kategori
    }
  ).catch(
    error => {
      return error.response
    }
  )
}

这是我在gteeters.js中的代码

export default {
  datas: state => {
    return state.data
  }
}

这是我在index.js中的代码

import Vue from 'vue'
import Vuex from 'vuex'
import state from './state'
import getters from './getters'

Vue.use(Vuex)

export default new Vuex.Store({
   state,
   getters
})

Answer 1

Data hook需要同步返回。您必须将加载添加到created或mounted，并将属性添加到数据/状态，因此反应性正在起作用。

需要使用操作触发使用Axios加载数据，因为它是异步的。突变需要同步运行。我在created添加了初始加载。 （mounted也可以。）

我已经使用Vuex助手mapState将状态属性映射到组件。使用getter也可以，但mapState更容易编写。

请查看下面的演示或此fiddle。

同时取消对小提琴中Vuex版本下方代码的注释，并对上面的应用进行评论，以了解Axios如何使用Vuex以便更好地理解。

const URL = 'https://jsonplaceholder.typicode.com/posts';

const store = new Vuex.Store({
  state: {
    posts: [],
    loading: true
  },
  actions: {
    loadData({
      commit
    }) {
      axios.get(URL).then((response) => {
        // console.log(response.data, this)
        commit('updatePosts', response.data)
        commit('changeLoadingState', false)
      })
    }
  },
  mutations: {
    updatePosts(state, posts) {
      state.posts = posts
    },
    changeLoadingState(state, loading) {
      state.loading = loading
    }
  }
})

new Vue({
  el: '#app',
  computed: Vuex.mapState(['posts', 'loading']),
  store,
  created() {
    //console.log(this.$store)
    this.$store.dispatch('loadData') // dispatch loading
  }
})

/*
	//example with-out vuex
  
new Vue({
	el: '#app',
	data() {
  	return {
    	loading: true,
      posts: [] // add posts here so reactivity is working, also undefined would be OK
    }
  },
  created() {
  	//this.loading = true --> not needed already set in data
  	axios.get(URL).then((response) => {
    	// console.log(response.data, this)
      this.posts = response.data
      this.loading = false
    })
  }
})

*/

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.13/vue.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vuex/3.0.1/vuex.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/axios/0.17.1/axios.js"></script>
<div id="app">
  <div v-if="loading">
    loading...
  </div>
  <div v-else>
    <ul>
      <li v-for="post in posts">
        <h1>
          {{post.title}}
        </h1>
        <p>
          {{post.body}}
        </p>
      </li>
    </ul>
  </div>
</div>

Answer 2

我将使用AWolf的解决方案，但是loadData方法中的错误处理略有改善

<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
    <script>

       function getUrlParams (){
          var url_params = new URLSearchParams();
          if( window.location.toString().indexOf("?") != -1) {
             var href_part = window.location.search.split('?')[1]
             href_part.replace(/([^=&]+)=([^&]*)/g,
                function(m, key, value) {
                   var attr = decodeURIComponent(key)
                   var val = decodeURIComponent(value)
                   url_params.append(attr,val);
             });
          }
          // for(var pair of url_params.entries()) { consolas.log(pair[0]+ '->'+ pair[1]); }
          return url_params ;
       }


      function getServerData (url, urlParams ){
          if ( typeof url_params == "undefined" ) { urlParams = getUrlParams()  }
          return axios.get(url , { params: urlParams } )
          .then(response => {
             return response ;
          })
          .catch(function(error) {
             console.error ( error )
             return error.response;
          })
       }

    // Action !!!
    getServerData(url , url_params)
        .then( response => {
           if ( response.status === 204 ) {
              var warningMsg = response.statusText
              console.warn ( warningMsg )
              return
           } else if ( response.status === 404 || response.status === 400) {
              var errorMsg = response.statusText // + ": "  + response.data.msg // this is my api
              console.error( errorMsg )
              return ;
           } else {
              var data = response.data
              var dataType = (typeof data)
              if ( dataType === 'undefined' ) {
                 var msg = 'unexpected error occurred while fetching data !!!'
                 // pass here to the ui change method the msg aka
                 // showMyMsg ( msg , "error")
              } else {
                 var items = data.dat // obs this is my api aka "dat" attribute - that is whatever happens to be your json key to get the data from
                 // call here the ui building method
                 // BuildList ( items )
              }
              return
           }

        })




    </script>