vue.js+axiosでjsonを読み込む

例えば、vue.jsでtableをsortする際に、tableに置く各要素を外部jsonから読み込みたい場合は以下のようにします。

main.js

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

Vue.component('demo-grid', {
    template: '#grid-template',
    props: {
        data: Array,
        columns: Array,
        filterKey: String
    },
    data: function () {
        var sortOrders = {}
        this.columns.forEach(function (key) {
            sortOrders[key] = 1
        })
        return {
            sortKey: '',
            sortOrders: sortOrders
        }
    },
    computed: {
        filteredData: function () {
            var sortKey = this.sortKey
            var filterKey = this.filterKey && this.filterKey.toLowerCase()
            var order = this.sortOrders[sortKey] || 1
            var data = this.data
            if (filterKey) {
                data = data.filter(function (row) {
                    return Object.keys(row).some(function (key) {
                        return String(row[key]).toLowerCase().indexOf(filterKey) > -1
                    })
                })
            }
            if (sortKey) {
                data = data.slice().sort(function (a, b) {
                    a = a[sortKey]
                    b = b[sortKey]
                    return (a === b ? 0 : a > b ? 1 : -1) * order
                })
            }
            return data
        }
    },
    filters: {
        capitalize: function (str) {
            return str.charAt(0).toUpperCase() + str.slice(1)
        }
    },
    methods: {
        sortBy: function (key) {
            this.sortKey = key
            this.sortOrders[key] = this.sortOrders[key] * -1
        }
    }
})

var demo = new Vue({
    el: '#demo',
    data: {
        searchQuery: '',
        gridColumns: ['id','name', 'name_jp','cp','hp','attack','defense','type1','type2'],
        gridData: []
    },
    beforeCreate: function () {
        axios.get('/json/pokemon.json')
            .then(function (response) {
                demo.gridData = response.data;
            })
            .catch(function (error) {
                console.log(error);
            });
    }
})

index.html

    <script type="text/x-template" id="grid-template">
      <table>
        <thead>
          <tr>
            <th v-for="key in columns"
              @click="sortBy(key)"
              :class="{ active: sortKey == key }">
              {{ key | capitalize }}
              <span class="arrow" :class="sortOrders[key] > 0 ? 'asc' : 'dsc'">
              </span>
            </th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="entry in filteredData">
            <td v-for="key in columns">
              {{entry[key]}}
            </td>
          </tr>
        </tbody>
      </table>
    </script>

    <div id="demo">
      <!--
      <form id="search">
        Search <input name="query" v-model="searchQuery">
      </form>
      -->
      <demo-grid
        :data="gridData"
        :columns="gridColumns"
        :filter-key="searchQuery">
      </demo-grid>
    </div>

/json/pokemon.json

[
  {
    "id": "382",
    "name": "Kyogre",
    "name_jp": "カイオーガ",
    "cp": "4074",
    "hp": "154",
    "attack": "270",
    "defense": "251",
    "stamina": "182",
    "type1": "み ず",
    "type2": "",
    "url": "http://www.pokemon.jp/zukan/detail/382.html",
    "img": "/img/382.png"
  }
]

ほとんどが公式ドキュメントにある通りですが(特にsort処理)、ポイントはbeforeCreate:, demo.gridData = response.data;あたりです。

var demo = new Vue({
    el: '#demo',
    data: {
        searchQuery: '',
        gridColumns: ['id','name', 'name_jp','cp','hp','attack','defense','type1','type2'],
        gridData: []
    },
    beforeCreate: function () {
        axios.get('/json/pokemon.json')
            .then(function (response) {
                demo.gridData = response.data;
            })
            .catch(function (error) {
                console.log(error);
            });
    }
})

参考 : https://jp.vuejs.org/v2/examples/grid-component.html