How to filter array inside of vue-virtual-scroll-list in Vuejs?

<div id="app">
  <div class="wrapper">
    <virtual-list class="list" style="height: 360px; overflow-y: auto" data-key="key" :keeps="20" :data-sources="computedItems" :data-component="Item" />
    <hr />
    <!-- Create a binding between the searchString model and the text field -->

    <input type="text" v-model="searchString" placeholder="lSources" />
    <p>sortKey = {{ sortKey }}</p>
    <li v-for="item in sortedItems" :key="item">
      <input class="checkbox-align" type="checkbox" :value="item.name" id="productname" v-model="item.checked" /> {{ item.price }} - {{ item.name }}
    </li>
  </div>
  <hr />
  <div class="bbb">
    <button @click="sortKey = 'name'" />name<br />
    <button @click="sortKey = 'price'" />price
  </div>
</div>