Vue 折腾记

前言

这个功能在网站中也很常见;下拉选择带搜索
基于之前的typeahead组件的基础上完善,
把过滤计算放在了computed ,其他逻辑也有所优化,代码更好理解

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效果图

实现逻辑

• 和typeahead的实现大同小异,就是选择和传递数据的细节有所改善和重置默认值的思路有所变动
• indexOf的比对稍微加强了,字母默认全部小写,还有输入的值去除空格

整体来说比typeahead组件更好理解和阅读

你能学到什么?

• css样式
• 组件临时增加的状态的处理
• 数据过滤
• 一些常用按键的监听实现(ESC,up,down,Enter),失焦等..
• 过滤数据的默认选中

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代码

• selectSearch.vue

<template>  <div class="select-search">    <div class="select-header" @click="isExpand=!isExpand">      <input type="text" autocomplete="off" readonly :placeholder="placeholder" :value="placeholderValue" @keydown.down.prevent="selectChildWidthArrowDown" @keydown.up.prevent="selectChildWidthArrowUp" @keydown.enter="selectChildWidthEnter">      <i class="fzicon " :class="isExpand?'fz-ad-jiantou1':'fz-ad-jiantou'"></i>    </div>    <div class="select-body" v-if="isExpand">      <input type="text" placeholder="关键字" v-model="searchVal" autocomplete="off" @blur="resetDefaultStatus" @keydown.esc="resetDefaultStatus" @keydown.down.prevent="selectChildWidthArrowDown" @keydown.up.prevent="selectChildWidthArrowUp" @keydown.enter="selectChildWidthEnter">      <transition name="el-fade-in-linear" mode="out-in">        <div class="typeahead-filter" v-show="typeaheadData">          <transition-group tag="ul" name="el-fade-in-linear">            <li v-for="(item,index) in typeaheadData " :key="index" :class="item.active ? 'active':''" @mouseenter="setActiveClass(index)" @mouseleave="setActiveClass(index)" @click="selectChild(index)">              <a href="javascript:;">                {{item.text}}              </a>            </li>          </transition-group>          <p class="noFound" v-show="typeaheadData && typeaheadData.length === 0">未能查询到,请重新输入!</p>        </div>      </transition>    </div>  </div></template><script>  export default {    name: 'selectSearch',    data: function () {      return {        placeholderValue: '',// 给看到选择内容的        isExpand: false,        searchVal: '', // 搜索关键字        resultVal: '', // 保存搜索到的值        searchList: [], //保存过滤的结果集        currentIndex: -1, // 当前默认选中的index,      }    },    computed: {      typeaheadData () {        let temp = [];        if (this.searchVal === '') {          return this.mapData;        } else {          this.currentIndex = -1;  // 重置特殊情况下的索引          this.mapData.forEach(item => {            item.active = false; // 取消高亮            if (item.text.indexOf(this.searchVal.toLowerCase().trim()) !== -1) {              temp.push(item)            }          })          return temp;        }      }    },    props: {      placeholder: {        type: String,        default: '--请选择--'      },      mapData: {        type: Array,        default: function () {          return [            {              text: 'wofsdf',              value: 0            },            {              text: '我是技术渣1',              value: 1            },            {              text: '我是技术渣2',              value: 2            },            {              text: '我是天坑',              value: 3            },            {              text: '我是天坑,分身乏术',              value: 4            },            {              text: '我是天坑2,分身乏术',              value: 5            },            {              text: '我是天坑3,分身乏术',              value: 6            }          ]        }      }    },    methods: {      resetDefaultStatus () {        this.searchVal = '';        this.resultVal = '';        this.currentIndex = -1;        this.typeaheadData.forEach(item => {          this.$set(item, 'active', false);        })      },      setActiveClass (index) { // 设置样式活动类        this.mapData.forEach((item, innerIndex) => {          if (index === innerIndex) {            this.$set(item, 'active', true);            this.currentIndex = index;  // 这句话是用来修正index,,就是键盘上下键的索引,不然会跳位          } else {            this.$set(item, 'active', false)          }        })      },      selectChildWidthArrowDown () {        // 判断index选中子项        if (this.currentIndex < this.typeaheadData.length) {          this.currentIndex++;          this.typeaheadData.forEach((item, index) => {            this.currentIndex === index ? this.$set(item, 'active', true) : this.$set(item, 'active', false);          })        }      },      selectChildWidthArrowUp () {        // 判断index选中子项        if (this.currentIndex > 0) {          this.currentIndex--;          this.typeaheadData.forEach((item, index) => {            this.currentIndex === index ? this.$set(item, 'active', true) : this.$set(item, 'active', false);          })        }      },      selectChildWidthEnter () {        // 若是结果集只有一个,则默认选中        if (this.typeaheadData.length === 1) {          this.searchVal = this.typeaheadData[0].text;          this.resultVal = this.typeaheadData[0].value;          this.placeholderValue = this.typeaheadData[0].text;          this.isExpand = false;          this.$emit('selectValue', { text: this.searchVal, value: this.resultVal })        } else {          // 若是搜索的内容完全匹配到项内的内容,则默认选中          this.typeaheadData.forEach(item => {            if (this.searchVal === item.text || item.active === true) {              this.searchVal = item.text;              this.placeholderValue = item.text;              this.resultVal = item.value;              this.isExpand = false;              this.$emit('selectValue', { text: this.searchVal, value: this.resultVal })            }          })        }        this.resetDefaultStatus();      },      selectChild (index) {        // 鼠标点击选择子项        this.mapData.forEach((item, innerIndex) => {          if (index === innerIndex || item.active) {            this.searchVal = item.text;            this.resultVal = item.value;            this.placeholderValue = item.text;            this.isExpand = false;          }          this.$set(item, 'active', false);        })        this.$emit('selectValue', { text: this.searchVal, value: this.resultVal });        this.resetDefaultStatus();      },    }  }</script><style scoped lang="scss">  .el-fade-in-linear-enter-active,  .el-fade-in-linear-leave-active,  .fade-in-linear-enter-active,  .fade-in-linear-leave-active {    transition: opacity .2s linear;  }  .el-fade-in-enter,  .el-fade-in-leave-active,  .el-fade-in-linear-enter,  .el-fade-in-linear-leave,  .el-fade-in-linear-leave-active,  .fade-in-linear-enter,  .fade-in-linear-leave,  .fade-in-linear-leave-active {    opacity: 0;  }  .select-search {    a {      color: #333;      text-decoration: none;      padding: 5px;    }    ul {      list-style: none;      padding: 6px 0;      margin: 0;      overflow: visible;      li {        display: block;        width: 100%;        padding: 5px;        font-size: 14px;        padding: 8px 10px;        position: relative;        white-space: nowrap;        overflow: hidden;        text-overflow: ellipsis;        color: #48576a;        height: 36px;        line-height: 1.5;        box-sizing: border-box;        cursor: pointer;        &.active {          background-color: #20a0ff;          a {            color: #fff;          }        }      }    }    .select-header {      position: relative;      border-radius: 4px;      border: 1px solid #bfcbd9;      outline: 0;      padding: 0 8px;      >input {        border: none;        -webkit-appearance: none;        -moz-appearance: none;        appearance: none;        width: 100%;        outline: 0;        box-sizing: border-box;        color: #1f2d3d;        font-size: inherit;        height: 36px;        line-height: 1;      }      >i {        transition: all .3s linear;        display: inline-block;        position: absolute;        right: 3%;        top: 50%;        transform: translateY(-50%);      }    }    .select-body {      z-index: 1000;      border-radius: 2px;      background-color: #fff;      box-shadow: 0 2px 4px rgba(0, 0, 0, .12), 0 0 6px rgba(0, 0, 0, .04);      box-sizing: border-box;      margin: 5px 0;      padding: 8px;      >input {        -webkit-appearance: none;        -moz-appearance: none;        appearance: none;        background-color: #fff;        background-image: none;        border-radius: 4px;        border: 1px solid #bfcbd9;        box-sizing: border-box;        color: #1f2d3d;        font-size: inherit;        height: 36px;        line-height: 1;        outline: 0;        padding: 3px 10px;        transition: border-color .2s cubic-bezier(.645, .045, .355, 1);        width: 100%;        display: inline-block;      }    }  }</style>

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总结

有更好的方案或者实现的可以往下留言,谢谢