You are using the runtime-only build of Vue where the template compiler is not available.

While trying to use Vue.js with Rails, I referred to this tutorial but encountered an issue where nothing was displayed on the screen.

Checking the console revealed the following error:

[Vue warn]: You are using the runtime-only build of Vue where the template compiler is not available. Either pre-compile the templates into render functions, or use the compiler-included build.

(found in <Root>)

After some research, it turned out that the issue was due to using the wrong version of Webpack. To confirm the version, I ran:

$ npm list --depth=0
rails-vue-sandbox@ /home/vagrant/rails/rails-vue-sandbox
├── @rails/[email protected]
├── [email protected]
├── [email protected]
├── [email protected]
└── [email protected]

To resolve the issue, I changed import Vue from 'vue' to import Vue from 'vue/dist/vue.esm';. This fixed the problem.

Adding an alias to config/webpack/shared.js can also resolve the issue, but this file is not generated by default in Webpacker 2.x, making it outdated information.

Here is the updated code that resolved the issue:

import Vue from 'vue/dist/vue.esm';
import App from '../app.vue';

// register the grid component
Vue.component('demo-grid', {
  template: '#grid-template',
  replace: true,
  props: {
    data: Array,
    columns: Array,
    filterKey: String
  },
  data: function () {
    var sortOrders = {};
    this.columns.forEach(function (key) {
      sortOrders[key] = 1;
    });
    return {
      sortKey: '',
      sortOrders: sortOrders
    };
  },
  computed: {
    filteredData: function () {
      var sortKey = this.sortKey;
      var filterKey = this.filterKey && this.filterKey.toLowerCase();
      var order = this.sortOrders[sortKey] || 1;
      var data = this.data;
      if (filterKey) {
        data = data.filter(function (row) {
          return Object.keys(row).some(function (key) {
            return String(row[key]).toLowerCase().indexOf(filterKey) > -1;
          });
        });
      }
      if (sortKey) {
        data = data.slice().sort(function (a, b) {
          a = a[sortKey];
          b = b[sortKey];
          return (a === b ? 0 : a > b ? 1 : -1) * order;
        });
      }
      return data;
    }
  },
  filters: {
    capitalize: function (str) {
      return str.charAt(0).toUpperCase() + str.slice(1);
    }
  },
  methods: {
    sortBy: function (key) {
      this.sortKey = key;
      this.sortOrders[key] = this.sortOrders[key] * -1;
    }
  }
});

// bootstrap the demo
var demo = new Vue({
  el: '#demo',
  data: {
    searchQuery: '',
    gridColumns: ['name', 'power'],
    gridData: [
      { name: 'Chuck Norris', power: Infinity },
      { name: 'Bruce Lee', power: 9000 },
      { name: 'Jackie Chan', power: 7000 },
      { name: 'Jet Li', power: 8000 }
    ]
  }
});