title: Vuetify data table get selected item
body: <p>I have a v-data-table that has Show-select,
  I want to get the data of what items I selected, at least alert the first column value upon check
  . Im searching everywhere. i cant find answer to my problem.</p>
  <pre><code>&lt;div id=&quot;app&quot;&gt;
    &lt;v-app id=&quot;inspire&quot;&gt;
      &lt;v-data-table
        :value=&quot;selected&quot;
        @input=&quot;enterSelect($event)&quot;
        :items-per-page=&quot;itemsPerPage&quot;
        :headers=&quot;headers&quot;
        :items=&quot;desserts&quot;
        item-key=&quot;name&quot;
        show-select
        class=&quot;elevation-1&quot;
      &gt;
      &lt;/v-data-table&gt;
      &lt;v-dialog&gt;
        &lt;v-card&gt;
        &lt;/v-card&gt;
      &lt;/v-dialog&gt;
    &lt;/v-app&gt;
  &lt;/div&gt;
  </code></pre>
  <p>js</p>
  <pre><code>new Vue({
    el: '#app',
    vuetify: new Vuetify(),
    methods: {
      enterSelect(values) {
        if (values.length == this.itemsPerPage) {
          alert('selected all')
        }
      }
    },
    data () {
      return {
        selected: [],
        itemsPerPage: 10,
        headers: [
          {
            text: 'Dessert (100g serving)',
            align: 'left',
            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' },
        ],
        desserts: [
          {
            name: 'Frozen Yogurt',
            calories: 159,
            fat: 6.0,
            carbs: 24,
            protein: 4.0,
            iron: '1%',
          },
          {
            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%',
          },
        ],
      }
    },
  })
  </code></pre>
  <p><a href="https://codepen.io/CodingDeer/pen/QWLyaog?editors=1010" rel="nofollow noreferrer">https://codepen.io/CodingDeer/pen/QWLyaog?editors=1010</a></p>
  <p>this is just an example of what I recently found (code not mine),
  this code can detect if all checkbox selected</p>