1

我有一个 Vuetify 数据表,每 5 秒从服务器刷新一次。它有可选择的行。如果您选择一行,那么数据中的某些内容会发生变化,所选项目的 v-model 数组不会反映行项目内部的变化。此 codepen 是 Vuetify 示例的略微修改版本:

https://codepen.io/hobbeschild/pen/bGqGMQQ?editors=1010

选择第一行。在顶部,您将看到所选项目中的时间。等待 5 秒以刷新数据。您将看到所选项目时间不再与行项目时间匹配。

有没有办法确保 v-model 数组内容反映项目中的新值?我可以想出一种以编程方式执行此操作的方法,但我有很多这样的表格,希望有一种更简单的方法,也许是表格道具。

HTML:

<div id="app">
  <v-app id="inspire">
    <div>selected = {{ selected[0] }}</div>
    <div>
      <v-data-table
        v-model="selected"
        show-select
        item-key="name"
        :headers="headers"
        :items="desserts"
        :options.sync="options"
        :server-items-length="totalDesserts"
        :loading="loading"
        class="elevation-1"
      ></v-data-table>
    </div>
  </v-app>
</div>

JS:

new Vue({
  el: '#app',
  vuetify: new Vuetify(),
  data () {
    return {
      selected: [],
      totalDesserts: 0,
      desserts: [],
      loading: true,
      options: {},
      headers: [
        {
          text: 'Dessert (100g serving)',
          align: 'start',
          sortable: false,
          value: 'name',
        },
        { text: 'Calories', value: 'calories' },
        { text: 'Fat (g)', value: 'fat' },
        { text: 'Carbs (g)', value: 'carbs' },
        { text: 'Protein (g)', value: 'protein' },
        { text: 'Iron (%)', value: 'iron' },
        { text: 'Time', value: 'time' },
      ],
      reloadTimerId: Number,
    }
  },
  watch: {
    options: {
      handler () {
        this.getDataFromApi()
      },
      deep: true,
    },
  },
  mounted () {
    this.getDataFromApi();
    this.reloadTimerId = setInterval(this.getDataFromApi, 5000);
  },
  methods: {
    getDataFromApi () {
      this.loading = true
      this.fakeApiCall().then(data => {
        this.desserts = data.items
        this.totalDesserts = data.total
        this.loading = false
      })
    },
    /**
     * In a real application this would be a call to fetch() or axios.get()
     */
    fakeApiCall () {
      return new Promise((resolve, reject) => {
        const { sortBy, sortDesc, page, itemsPerPage } = this.options

        let items = this.getDesserts()
        const total = items.length

        if (sortBy.length === 1 && sortDesc.length === 1) {
          items = items.sort((a, b) => {
            const sortA = a[sortBy[0]]
            const sortB = b[sortBy[0]]

            if (sortDesc[0]) {
              if (sortA < sortB) return 1
              if (sortA > sortB) return -1
              return 0
            } else {
              if (sortA < sortB) return -1
              if (sortA > sortB) return 1
              return 0
            }
          })
        }

        if (itemsPerPage > 0) {
          items = items.slice((page - 1) * itemsPerPage, page * itemsPerPage)
        }

        setTimeout(() => {
          resolve({
            items,
            total,
          })
        }, 1000)
      })
    },
    getDesserts () {
      return [
        {
          name: 'Frozen Yogurt',
          calories: 159,
          fat: 6.0,
          carbs: 24,
          protein: 4.0,
          iron: '1%',
          time: new Date(),
        },
        {
          name: 'Ice cream sandwich',
          calories: 237,
          fat: 9.0,
          carbs: 37,
          protein: 4.3,
          iron: '1%',
        },
        {
          name: 'Eclair',
          calories: 262,
          fat: 16.0,
          carbs: 23,
          protein: 6.0,
          iron: '7%',
        },
        {
          name: 'Cupcake',
          calories: 305,
          fat: 3.7,
          carbs: 67,
          protein: 4.3,
          iron: '8%',
        },
        {
          name: 'Gingerbread',
          calories: 356,
          fat: 16.0,
          carbs: 49,
          protein: 3.9,
          iron: '16%',
        },
        {
          name: 'Jelly bean',
          calories: 375,
          fat: 0.0,
          carbs: 94,
          protein: 0.0,
          iron: '0%',
        },
        {
          name: 'Lollipop',
          calories: 392,
          fat: 0.2,
          carbs: 98,
          protein: 0,
          iron: '2%',
        },
        {
          name: 'Honeycomb',
          calories: 408,
          fat: 3.2,
          carbs: 87,
          protein: 6.5,
          iron: '45%',
        },
        {
          name: 'Donut',
          calories: 452,
          fat: 25.0,
          carbs: 51,
          protein: 4.9,
          iron: '22%',
        },
        {
          name: 'KitKat',
          calories: 518,
          fat: 26.0,
          carbs: 65,
          protein: 7,
          iron: '6%',
        },
      ]
    },
  },
})
4

1 回答 1

1

我认为没有任何“内置”方式可以做你想做的事。问题是模型(在您的代码中)包含来自/数组selected的选定对象的引用。如果你用包含全新对象的全新数组替换/ (用),这就是你得到的......itemsdesertsitemsdesertsthis.desserts = data.items

所以自己做这件事肯定是唯一的方法。任何一个:

  1. selected每次替换items/时重新创建deserts
this.selected = data.items.filter(i => this.selected.findIndex(item => item.name === i.name) > -1)
  1. 或者不要替换数组它的项目 - 用新数据更新现有对象
于 2021-05-10T16:00:51.757 回答