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  <div id="app">
    <section class="section">
      <h1 class="title">Vue Select/De-select Demo</h1>
      <p class="content">
        This CodePen manages a set of selects including a top-level select/de-select control
      <div class="columns">
        <div class="column">
      <table class="table">
            <th><input type="checkbox" class="checkbox" :checked="allSelected" @click="selectAll"/></th>
          <tr v-for="itm in items" :key="">
            <td><input type="checkbox" class="checkbox" v-model="itm.selected"/></td>
            <td>{{ }}</td>
            <td>{{ }}</td>
        <div class="column">
          <div class="box">
          <h2 class="subtitle">Current Selections</h2>
            <p class="content">
              {{ currentSelections }}
      <p class="content">
        Select any combination of checkboxes.  The top-level checkbox will set or clear all of the items.  Individual item selections can also change the state of the top-level checkbox, depdending on whether their sibilings are all set or not.
    <footer class="footer">
      <p class="content">
        Was this useful?  If so, please give a like.

export default {
  data() {
    return {
      items: [
       { id: 101, name: "Item #1" },
       { id: 102, name: "Item #2" },
       { id: 103, name: "Item #3" }
      currentSelections: null
  mounted() {
    // Pretend "items" comes from an api
    // This forEach() supplements the faux api-provided items with 
    // a flag.  This is easier to work with than managing the
    // selections separately (say using selectedItems[]).
    this.items.forEach( itm => this.$set(itm, "selected", false));
  computed: {
    allSelected() {
      return this.items.every(itm => itm.selected);
  methods: {
    selectAll() {
      let all_s = this.allSelected;
      this.items.forEach( itm => itm.selected = !all_s );
  watch: {
    items: {
      handler() {
        this.currentSelections = this.items
          .filter( itm => itm.selected )
          .map( itm => )
      deep: true