自動完成輸入

Created: November-22, 2018

這是自動完成輸入的一個小示例。

CSS

.autocomplete {
  position: relative;
}
.autocomplete-list {
  position: absolute;
  z-index: 2;
  top: 25px;

  min-width: 150px;
  margin: 0;
  padding: 0;

  list-style: none;

  border: 1px solid #eee;
  border-radius: 4px;
  background-color: #fff;
}
.autocomplete-list li {
  margin: 0;
  padding: 8px 15px;

  border-bottom: 1px solid #eee;
}
.autocomplete-list li:last-child {
  border-bottom: 0;
}
.autocomplete-list li:hover,
.autocomplete-list li.active {
  background-color: #f5f5f5;
}

使用 Javascript

const Autocomplete = Vue.component('autocomplete', {
  template: '#autocomplete-tpl',
  props: ['items'],
  data: function() {
    return {
      inputValue: '',
      searchMatch: [],
      selectedIndex: -1
    }
  },
  computed: {
    listToSearch() {
      if(typeof this.items !== 'undefined' && this.items.length > 0) {
        return this.items;
      } else {
        return [
          'input',
          'h1',
          'h2',
          'span',
          'div',
          'textarea',
          'margin',
          'padding',
          'background',
          'background-color',
          'background-size',
          'background-repeat'
        ]
      }
    }
  },
  watch: {
    inputValue(val) {
      this.searchMatch = [];
      if(this.inputValue !== '') {
        this.searchMatch = this.listToSearch.filter((el) => el.indexOf(val) >= 0);  
      }
      if (this.searchMatch.length === 1 && this.inputValue === this.searchMatch[0]) {
        this.searchMatch = [];
      }

    }
  },
  methods: {
    moveDown() {
      if(this.selectedIndex < this.searchMatch.length-1) {
        this.selectedIndex++;
      }
    },
    moveUp() {
      if(this.selectedIndex !== -1) {
        this.selectedIndex--;
      }
    },
    selectItem(index) {
      this.selectedIndex = index;
    },
    chooseItem() {
      if(this.selectedIndex !== -1) { 
        this.inputValue = this.searchMatch[this.selectedIndex];
        this.selectedIndex = -1;
      }
    }
  }
});

new Vue({
  el: '#app'
});

HTML

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Autocomplete</title>
    <script type="text/x-template" id="autocomplete-tpl">
  <div class="autocomplete">
    <input @keydown.13="chooseItem" @keydown.40="moveDown" @keydown.38="moveUp" v-model="inputValue" type="text">  

      <ul class="autocomplete-list" v-if="searchMatch.length > 0">
        <li :class="{active: selectedIndex === index}"v-for="(result, index) in searchMatch" @click="selectItem(index), chooseItem()">
          {{result}}
      </li>
      </ul>
      </div>
    </script>
  </head>
  <body>

    <div id="app">
      Own items:<br />
      <autocomplete :items="['all', 'auto', 'complete', 'items']"></autocomplete>
      <br /><br />
      Standard items:<br />
      <autocomplete></autocomplete>
    </div>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.3.3/vue.js"></script>

  </body>
</html>