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HTML

              
                <div id="app">
  <v-app>
    <v-content>
      <v-container>
        <h1>Fixed columns in v-data-table demo</h1>
        <p>Note: fixed columns and grouping tables below are added only in <a target="_blank" href="https://github.com/lzhoucs/vuetify">my vuetify folk</a>, which is published on <a target="_blank" href="https://www.npmjs.com/package/@lzhoucs/vuetify">npm</a>. Also checkout <a target="_blank" href="https://codepen.io/lzhoucs/pen/aadaJx">more detailed grouping table demo</a></p>

        <div class='section'>
          <h2>0. Regular Table(without fixed columns)</h2>
          <v-data-table :headers="headers0" :items="desserts" item-key="name" v-model="selected0" select-all>

            <template slot="items" slot-scope="props">
              <tr>
                <td>
                  <v-checkbox
                    v-model="props.selected"
                    hide-details
                  ></v-checkbox>
                </td>
                <td>{{ props.item.name }}</td>
                <td>{{ props.item.calories }}</td>
                <td>{{ props.item.fat }}</td>
                <td>{{ props.item.carbs }}</td>
                <td>{{ props.item.protein }}</td>
                <td>{{ props.item.nprotein }}</td>
                <td>{{ props.item.iron }}</td>
                <td>{{ props.item.niron }}</td>
              </tr>
            </template>

          </v-data-table>
        </div>

        <div class='section'>
          <h2>1. Regular Table with fixed columns</h2>
          <p>Fixed columns applied onto a regular table. grouping and checkboxes are not involved.</p>
          <v-data-table :headers="headers" :items="desserts" item-key="name">

            <template slot="items" slot-scope="props">
              <tr>
                <td>{{ props.item.name }}</td>
                <td>{{ props.item.calories }}</td>
                <td>{{ props.item.fat }}</td>
                <td>{{ props.item.carbs }}</td>
                <td>{{ props.item.protein }}</td>
                <td>{{ props.item.nprotein }}</td>
                <td>{{ props.item.iron }}</td>
                <td>{{ props.item.niron }}</td>
              </tr>
            </template>

          </v-data-table>
        </div>

        <div class='section'>
          <h2>2. Selection(checkbox) Table with fixed columns</h2>
          <p>Fixed column applied onto a regular table with a checkbox column. No select all header. It expects an empty header with width
            to be specified which is used to render a regular empty header for checkbox column:
            <code>{ text: '', fixed: true, width: '100px', sortable: false }</code>. Note: <code>sortable:false</code> is required</p>
          <v-data-table :headers="headers2" :items="desserts" item-key="name" v-model="selected2">

            <template slot="items" slot-scope="props">
              <tr>
                <td>
                  <v-checkbox
                    v-model="props.selected"
                    hide-details
                  ></v-checkbox>
                </td>
                <td>{{ props.item.name }}</td>
                <td>{{ props.item.calories }}</td>
                <td>{{ props.item.fat }}</td>
                <td>{{ props.item.carbs }}</td>
                <td>{{ props.item.protein }}</td>
                <td>{{ props.item.nprotein }}</td>
                <td>{{ props.item.iron }}</td>
                <td>{{ props.item.niron }}</td>
              </tr>
            </template>

          </v-data-table>
        </div>

        <div class='section'>
          <h2>3. Selection(checkbox) Table with fixed columns and select all</h2>
          <p>Fixed column applied onto a regular table with a checkbox column. Has select all header. Similar to #2, it also expects an empty header with width
            to be specified which is used to render a 'select all' header for checkbox column:
            <code>{ text: '', fixed: true, width: '100px'}</code>. Note: <code>sortable:false</code> is no longer required</p>
          <v-data-table :headers="headers3" :items="desserts" item-key="name" v-model="selected3" select-all>

            <template slot="items" slot-scope="props">
              <tr>
                <td>
                  <v-checkbox
                    v-model="props.selected"
                    hide-details
                  ></v-checkbox>
                </td>
                <td>{{ props.item.name }}</td>
                <td>{{ props.item.calories }}</td>
                <td>{{ props.item.fat }}</td>
                <td>{{ props.item.carbs }}</td>
                <td>{{ props.item.protein }}</td>
                <td>{{ props.item.nprotein }}</td>
                <td>{{ props.item.iron }}</td>
                <td>{{ props.item.niron }}</td>
              </tr>
            </template>

          </v-data-table>
        </div>

        <div class='section'>
          <h2>4. Grouping Table with fixed columns</h2>
          <v-data-table :headers="headers" :items="desserts" item-key="name" group-key="category">

            <template slot="group" slot-scope="props">
              <span class="font-weight-bold">
                Group {{props.groupIndex + 1}} - {{props.groupName}}
              </span>
            </template>

            <template slot="items" slot-scope="props">
              <tr>
                <td>{{ props.item.name }}</td>
                <td>{{ props.item.calories }}</td>
                <td>{{ props.item.fat }}</td>
                <td>{{ props.item.carbs }}</td>
                <td>{{ props.item.protein }}</td>
                <td>{{ props.item.nprotein }}</td>
                <td>{{ props.item.iron }}</td>
                <td>{{ props.item.niron }}</td>
              </tr>
            </template>

          </v-data-table>
        </div>

        <div class='section'>
          <h2>5. Grouping Table with fixed columns and select all</h2>
          <v-data-table :headers="headers5" :items="desserts" item-key="name" group-key="category" v-model="selected5" select-all>

            <template slot="group" slot-scope="props">
              <span class="font-weight-bold">
                Group {{props.groupIndex + 1}} - {{props.groupName}}
              </span>
            </template>

            <template slot="items" slot-scope="props">
              <tr>
                <td>
                  <v-checkbox
                    v-model="props.selected"
                    hide-details
                  ></v-checkbox>
                </td>
                <td>{{ props.item.name }}</td>
                <td>{{ props.item.calories }}</td>
                <td>{{ props.item.fat }}</td>
                <td>{{ props.item.carbs }}</td>
                <td>{{ props.item.protein }}</td>
                <td>{{ props.item.nprotein }}</td>
                <td>{{ props.item.iron }}</td>
                <td>{{ props.item.niron }}</td>
              </tr>
            </template>

          </v-data-table>
        </div>


      </v-container>
    </v-content>
  </v-app>
</div>
              
            
!

CSS

              
                .section {
  margin-top: 50px
}
              
            
!

JS

              
                new Vue({
  el: "#app",
  data: () => ({
      selected0: [],
      selected2: [],
      selected3: [],
      selected5: [],
      headers: [
        {text: "Dessert (100g serving)", value: "name", width: "200px", fixed: true},
        {text: "Calories", value: "calories", width: "200px", fixed: true},
        {text: "Fat (g)", value: "fat", width: "300px"},
        {text: "Carbs (g)", value: "carbs", width: "300px"},
        {text: "Protein (g)", value: "protein", width: "300px"},
        {text: "New Protein (g)", value: "nprotein", width: "300px"},
        {text: "Iron (%)", value: "iron", width: "300px"},
        {text: "New Iron (%)", value: "niron", width: "300px"}
      ],
      desserts: [
        {
          value: false,
          name: "Orange Juice",
          category: "Beverage",
          calories: 262,
          fat: 16.0,
          carbs: 23,
          protein: 6.0,
          nprotein: 6.0,
          iron: "7%",
          niron: "7%"
        },
        {
          value: false,
          name: "Larabar",
          category: "Snack",
          calories: 408,
          fat: 3.2,
          carbs: 87,
          protein: 6.5,
          nprotein: 6.5,
          iron: "45%",
          niron: "45%"
        },
        {
          value: false,
          name: "Donut",
          category: "Breakfast",
          calories: 452,
          fat: 25.0,
          carbs: 51,
          protein: 4.9,
          nprotein: 4.9,
          iron: "22%",
          niron: "22%"
        },

        {
          value: false,
          name: "Bagel",
          category: "Breakfast",
          calories: 999,
          fat: 28.0,
          carbs: 151,
          protein: 2.9,
          nprotein: 2.9,
          iron: "29%",
          niron: "29%"
        },
        {
          value: false,
          name: "KitKat",
          category: "Snack",
          calories: 518,
          fat: 26.0,
          carbs: 65,
          protein: 7,
          nprotein: 7,
          iron: "6%",
          niron: "6%"
        }
      ]
    }),

    computed: {
      headers0() {
        return this.headers.map(header => Object.assign({}, header, {fixed: false}))
      },
      headers2() {
        return [
          { text: '', fixed: true, width: '100px', sortable: false }
        ].concat(this.headers)
      },
      headers3() {
        return [
          { text: '', fixed: true, width: '100px'}
        ].concat(this.headers)
      },
      headers5() {
        return this.headers3
      }

    }
});

              
            
!
999px

Console