javascript - 尝试使用 Vuejs 中的计算属性过滤数组值时出现问题？

Question

<div id="app">
  <div v-if="isLoaded">
    <select v-model="selectNum" name="text"> 
      <option value="" selected="selected">Select status</option>
      <option value="ok">ok</option>
      <option value="notok">notok</option>
    </select>
  </div>
  <div class="search-wrapper">  
    <input type="text" v-model="search" placeholder="Search title.."/>
        <label>Search Users:</label>
  </div>  
  <ul>
    <li v-for="user in userList"></li>
    <li v-for="manage in manageList"></li>
  </ul>
</div> 

const app = new Vue ({
  el: '#app',
  data: {
     search: '',
      itemsList: [],
      isLoaded: false,
      selectNum: '',
      userList: [
        {
          id: 1,
          name: "Prem",
          status:"ok"
        },
        {
          id: 2,
          name: "Chandu",
          status:"notok"
        },
        {
          id: 3,
          name: "Shravya",
          status:"ok"
        },
        {
          id: 4,
          name: "kirt",
          status:"notok"
        }
      ],
    manageList: [
        {
          id: 1,
          name: "cc",
          status:"ok"
        },
        {
          id: 2,
          name: "aa",
          status:"notok"
        },
        {
          id: 3,
          name: "a",
          status:"ok"
        },
        {
          id: 4,
          name: "vv",
          status:"notok"
        }
      ]
  },
 created(){
    this.isLoaded = true;
  },
computed: {
    filteredAndSorted(){
     function compare(a, b) {
       if (a.name < b.name) return -1;
       if (a.name > b.name) return 1;
       return 0;
     }
     const res = this.userList.filter(user => {
          return user.name.toLowerCase().includes(this.search.toLowerCase())
       }).sort(compare)
     if (this.selectNum) {
       return res.filter(user => user.status === this.selectNum )
     }
     return res
    }
}
})

从多个 v-for 开始，我想显示数据，后来我有两个过滤器，其中一个用于过滤数组，第二个用于从下拉列表中选择特定数组，我为所有这些都编写了一些逻辑，但是我不确定如何在过滤器中组合我的循环逻辑，以便它相应地工作？

这是我的代码链接:- https://codepen.io/dhanunjayt/pen/vYeeorm

Answer 1

您不需要创建另一个数组来存储搜索结果。 Vuejs 为此提供了计算属性。

HTML

<div id="app">
  <div v-if="isLoaded">
    <select v-model="selectNum" name="text">  <!-- HERE -->
      <option value="" selected="selected">Select status</option>
      <option value="ok">ok</option>
      <option value="notok">notok</option>
    </select>
  </div>
  
  <div class="search-wrapper">  
    <input type="text" v-model="search" placeholder="Search title.."/>
    <label>Search Users:</label>
  </div>
  <span>Search Results</span>
  <ul>
    <li v-for="user in search_results">Name:{{user.name}} and Status:{{user.status}}</li>
  </ul>
  <span>All Users</span>
  <ul>
    <li v-for="user in userList">Name:{{user.name}} and Status:{{user.status}}</li>
  </ul>
</div> 

JS

const app = new Vue({
  el: "#app",
  data: {
    search: "",
    isLoaded: false,
    selectNum: "",
    userList: [
      {
        id: 1,
        name: "Prem",
        status: "ok"
      },
      {
        id: 2,
        name: "Chandu",
        status: "notok"
      },
      {
        id: 3,
        name: "Shravya",
        status: "ok"
      },
      {
        id: 4,
        name: "kirt",
        status: "notok"
      }
    ],
    manageList: [
      {
        id: 1,
        name: "cc",
        status: "ok"
      },
      {
        id: 2,
        name: "aa",
        status: "notok"
      },
      {
        id: 3,
        name: "a",
        status: "ok"
      },
      {
        id: 4,
        name: "vv",
        status: "notok"
      }
    ]
  },
  created() {
    this.isLoaded = true;
  },
  computed: {
    search_results: function () {
      let that = this;
      if (that.search.length == 0 && that.selectNum.length == 0) return;
      return this.userList.filter(
        (item) =>
          item.name
            .toLocaleLowerCase()
            .indexOf(that.search.toLocaleLowerCase()) >= 0 &&
          item.status.toLocaleLowerCase() == that.selectNum.toLocaleLowerCase()
      );
    }
  }
});