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ElementUI应用：实现“在下拉列表里面进行搜索功能”的应用

作者：andy0012023.04.03来源：Web前端之家浏览：3416评论:0
关键词：ElementUI

ElementUI应用：实现“在下拉列表里面进行搜索功能”的应用。

  1. 首先我们需要实现上图的效果,然后Element-UI的el-select是没有的,所以需要自己写

  2. 我们需要用到el-popover组件,然后使用它的v-model="visible"来实现控制显示

  3. 我们在el-popover的slot="reference" 放一个el-select

    1. 使用popper-append-to-body="false"不需要插入浮动元素

    2. 使用popper-class="hide-popper"定义浮窗class为hide-popper,并设置display:none,这样选中了就不会存在el-select的下拉选项

    3. el-option 循环下面选择的list里面的元素,这样就可以在el-select展示选中的并存在删除

    4. el-select双向绑定的就是自定义选择的数组

html:

<template>
    <div class="arrbox">
        <!-- 通过visible控制显示还是隐藏 -->
        <el-popover
        v-model="visible"
        placement="bottom-start"
        width="auto"
        >
        <div slot="reference" class="check-select">
            <!-- popper-append-to-body:不需要插入浮动元素,popper-class:设置类名并隐藏 -->
            <el-select
            ref="select"
            v-model="currentval"
            :style="{width:`${width}px`,height:`${height}`}"
            multiple
            :placeholder="placeholder"
            :popper-append-to-body="false"
            popper-class="hide-popper"
            style="width:100%"
            @visible-change="visibleChange"
            @focus="getFocus"
            > <el-option
            v-for="item in selectItem"
            :key="`${item.value}_k`"
            :label="item.label"
            :value="item.value"
            /></el-select>
        </div>
        <!-- selectBxClick让select强制选中 -->
        <div class="selectMain" :style="{'min-width':`${width-20}px`}" @click="selectBxClick">
            <div class="seachButton">
            <el-select
                v-model="seachValue"
                placeholder=" 请选择筛选"
                style="width:70%;margin-right:10px;max-width:195px"
                @visible-change="selectBxClick()"
            >
                <el-option
                v-for="item in seachList"
                :key="item.value"
                :value="item.value"
                :label="item.label"
                />
            </el-select>
            <div class="btn" @click="seachBtn">搜索</div>
            </div>
             <div class="selectDiv">
                              <div v-for="item in list.filter(n=>n.value=='all')" :key="item.value" class="list" :class="[currentval.indexOf(item.value)!=-1?'selected':'',item.value=='all'?'allCheck':'']" @click="clickItem(item)">{{ item.label }}</div>

                              <div class="selectDivAuto">
                                <div v-for="item in list.filter(n=>n.value!='all')" :key="item.value" class="list" :class="[currentval.indexOf(item.value)!=-1?'selected':'',item.value=='all'?'allCheck':'']" @click="clickItem(item)">{{ item.label }}</div>
                              </div>

                            </div>
        </div>
        </el-popover>
    </div>
    </template>

js:

使用getFocus获取是否聚焦,聚焦了让visible=true,这样就可以显示出自定义的下拉选择项

通过visibleChange实施监听el-select,控制el-popover显示

在点击自定义的下拉选择项时,通过@click="selectBxClick"让el-select一直聚焦,这样箭头就会一直向上

通过 @click="seachBtn"和getList获取列表,具体需要自己去自定义

// 模拟获取的数据
    const seachClickList = [{value: '1',label: '测试1',type: '1'},{value: '2',label: '测试2',type: '1'},{value: '3',label: '测试3',type: '1'},{value: '4',label: '测试4',type: '2'},{value: '5',label: '测试5',type: '2'},{value: '6',label: '测试6',type: '2'},{value: '7',label: '测试7',type: '2'}]
    export default {
    model: {
        prop: 'parentArr',
        event: 'change-parentArr'
    },
    props: {
        parentArr: {
        type: Array,
        default() {
            return []
        }
        },
        // 传入选中的item,主要时防止list里面没有选中的数据
        parentSelectItem: {
        type: Array,
        default() {
            return []
        }
        },
        width: {
        type: Number,
        default: 300
        },
        height: {
        type: Number,
        default: 30
        },
        placeholder: {
        type: String,
        default: '请输入'
        }
    },
    data() {
        return {
        seachList: [
            {
            value: '1',
            label: '条件一'
            },
            {
            value: '2',
            label: '条件二'
            }
        ],
        visible: false,
        currentval: [],
        list: [],
        selectItem: [],
        seachValue: '1'
        }
    },
    watch: {
        seachValue: {
        handler(value) {
            this.getList(value)
        },
        deep: true,
        immediate: true
        },
        parentArr: {
        handler(value) {
            this.currentval = value
        },
        deep: true,
        immediate: true
        },
        parentSelectItem: {
        handler(value) {
            this.selectItem =  value.map(n => {
                              if (n.value == 'all') {
                                n.label = '全部'
                              }
                              return n
                            })
        },
        deep: true,
        immediate: true
        },
        currentval: {
                        handler(value) {
                                this.$emit('change-parentArr', value)
                        }
        }
    },
    created() {
    },
    methods: {
        getList(value) {
                        this.list = [{
                                label: '全部',
                                value: 'all'
                        }, ...seachClickList.filter(n => n.type == value)]
                        this.getSelectItem()
        },
        // 获取选中的item
        getSelectItem() {
                        const noItemList = this.currentval.map(n => {
                                if (this.selectItem.findIndex(i => i.value == n) == -1) {
                                return n
                                }
                                return null
                        }).filter(n => n != null)
                        noItemList.forEach(item => {
                                const index = this.list.findIndex(i => i.value == item)
                                if (index != -1) {
                                this.selectItem.push(this.list[index])
                                }
                        })
        },
        getFocus() {
                        this.visible = true
        },
        visibleChange(data) {
                        this.visible = data
        },
        selectBxClick() {
                        // 避免点击框体时组件消失
                        this.$refs.select.visible = true
        },
        // 选择
        clickItem(item) {
                      const index = this.currentval.indexOf(item.value)
                      if (index == -1) {
                        if (item.value == 'all') {
                          this.currentval = ['all']
                          this.selectItem = [{
                            label: '全部',
                            value: 'all'
                          }]
                        } else {
                          this.currentval.push(item.value)
                          this.selectItem.push(item)
                          const currentvalIndex = this.currentval.indexOf('all')
                          const selectItemIndex = this.selectItem.findIndex(n => n.value == 'all')
                          if (currentvalIndex != -1 && selectItemIndex != -1) {
                            this.selectItem.splice(selectItemIndex, 1)
                            this.currentval.splice(currentvalIndex, 1)
                          }
                        }
                      } else {
                        const itemIndex = this.selectItem.findIndex(n => n.value == item.value)
                        this.selectItem.splice(itemIndex, 1)
                        this.currentval.splice(index, 1)
                      }
                    },
        // 搜索
        seachBtn() {
                        this.getList()
        }
    }
    }

css:

selected属性使用了el-select的样式,让样子尽量一致

.arrbox {
display: inline-block;
}
.check-select{
::v-deep.hide-popper{
    display: none;
}
}
::v-deep .el-input__suffix{
i:not(.el-select__caret){
    display: none;
}
}
.selectMain {
width: 100%;
height: 100%;
.seachButton{
    width: 100%;
    align-items: center;
    display: flex;
    div.btn{
    width: 25%;
    max-width: 70px;
    max-width: 80px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: #fff;
    background-color: #409EFF;
    border-radius: 5px;
    cursor: pointer;
    }
}
.selectDiv{
        width: 100%;
        max-width: 500px;
        margin-top: 10px;
        padding:  0 10px 0 0;
        .list{
          width: 100%;
          padding: 10px 20px 10px 10px;
          color: #666;
          cursor: pointer;
          position: relative;
          &.selected{
            color: #409EFF;
            &::after{
              position: absolute;
              right: 0px;
              top: 50%;
              transform: translateY(-50%);
              font-family: element-icons;
              content: "\e6da";
              font-size: 12px;
              font-weight: 700;
              -webkit-font-smoothing: antialiased;
            }
          }
        }
        .selectDivAuto{
          width: calc(100% + 15px);
          max-height: 300px;
          overflow-y: auto;
          .list{
            padding: 10px 30px 10px 10px;
            &.selected::after{
              right: 10px;
            }
          }
        }
 
      }
}
.allCheck{
border-bottom: 1px solid rgb(228, 225, 225);
}

使用

<template>
    <seachSelectInput v-model="from.tag" :parentSelectItem='selectItem' :width="302" placeholder="请选择标签" />
</template>
<script>
import seachSelectInput from ./seachSelectInput'
export default {
components: {
    seachSelectInput
},
data(){
    return{
        from:{
            tag:['1']
        },
        selectItem:[
            {
            value: '1',
            label: '测试1'
            }
        ]
    }
}
}

大家试试吧。

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