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HTML

              
                <!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="utf-8">
  <title>Vue.js App</title>
  <link href="main.css" rel="stylesheet">
</head>
<body>
<div id="app">
  <input v-model.number="budget"> 円以下に絞り込む
  <input v-model.number="limit"> 件を表示
  <p>{{ matched.length }} 件中 {{ filteredList.length }} 件を表示中</p>
  <ul>
    <!-- v-forでは最終結果、算出プロパティのlimitedを使用する -->
    <li v-for="item in limited" v-bind:key="item.id">
      {{ item.name }} {{ item.price }}円
    </li>
  </ul>
</div>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.5.16/dist/vue.js"></script>
</body>
</html>
              
            
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CSS

              
                
              
            
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JS

              
                new Vue({
  el: '#app',
  data: {
    // フォームの入力と紐付けるデータ
    budget: 300,
    // 表示件数
    limit: 2,
    // もとになるリスト
    list: [
      { id: 1, name: 'りんご', price: 100 },
      { id: 2, name: 'ばなな', price: 200 },
      { id: 3, name: 'いちご', price: 400 },
      { id: 4, name: 'おれんじ', price: 300 },
      { id: 5, name: 'めろん', price: 500 }
    ]
  },
  computed: {
    // budget以下のリストを返す算出プロパティ
    matched: function () {
      return this.list.filter(function (el) {
        return el.price <= this.budget
      }, this)
    },
    // matchedで返ったデータをlimit件返す算出プロパティ
    limited: function () {
      return this.matched.slice(0, this.limit) 
    },
    filteredList: function () {
      return this.limited
    }
  }
})
              
            
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999px

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