<div id="app">
  <v-app>
    <v-main>
      <v-container class="pt-10 pb-5">
        <h1 class="text-center py-5">サンプルアプリ(データテーブル/CSV)</h1>
        <p class="text-justify px-10 py-5">
          使用CSVファイル: <a href="https://www.mhlw.go.jp/content/pcr_case_daily.csv" target="_blank" rel="noreferrer">https://www.mhlw.go.jp/content/pcr_case_daily.csv</a>
        </p>
        <v-divider></v-divider>
        <v-card>
          <v-card-title>
            <v-text-field v-model="search" append-icon="mdi-magnify" label="Search" single-line hide-details></v-text-field>
          </v-card-title>
          <v-data-table :headers="headers" :items="items" :search="search"></v-data-table>
        </v-card>
      </v-container>
    </v-main>
  </v-app>
  <v-overlay :value="isLoading">
    <v-progress-circular indeterminate size="64"></v-progress-circular>
  </v-overlay>
</div>

new Vue({
  el: "#app",
  vuetify: new Vuetify(),
  data() {
    return {
      search: "",
      headers: [],
      items: [],
      isLoading: false
    };
  },
  mounted() {
    var self = this;
    self.isLoading = true;
    axios
      .get(
        //'https://www.mhlw.go.jp/content/pcr_case_daily.csv'
        "https://uedayou.github.io/vue-cdn-mashup-sample-apps/vue2/csv/pcr_case_daily.csv"
      )
      .then(function (response) {
        const parsed = Papa.parse(response.data, {
          header: true,
          skipEmptyLines: true
        });
        self.setData(parsed.data);
      })
      .catch(function (error) {
        console.log(error);
      })
      .finally(function () {
        self.isLoading = false;
      });
  },
  methods: {
    setData: function (data) {
      const _headers = [];
      for (const d of data) {
        const item = {};
        for (const key in d) {
          item[key] = d[key];
          _headers.push(key);
        }
        this.items.push(item);
      }
      for (const h of [...new Set(_headers)]) {
        this.headers.push({
          text: h,
          value: h
        });
      }
    }
  }
});