JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.3/vue.min.js"></script>
<div id="app">
  <table>
    <tr v-for="row in values">
      <td v-for="(n, i) in row">
        <input
          v-model="row[i]"
          @keydown.tab="i === row.length - 1 ? onTab(n) : null"
        >
      </td>
    </tr>
  </table>
</div>

JavaScript

new Vue({
  el: '#app',
  data: {
    values: [
      [ 1, 2, 3 ],
      [ 4, 5, 6 ],
      [ 7, 8, 9 ],
    ],
  },
  methods: {
    onTab(val) {
      alert(`tab pressed: ${val}`);
    },
  },
});