vue高阶组件怎么用（vue更多筛选项小组件使用详解）

<template>
  <li :class="['colla-wrap']" ref="filter">
    <li class="colla-box" ref="filterCont" :style="maxWidth ? 'max-width:' + maxWidth: ''">
      <slot></slot>
    </li>
    <li class="ctrl">
      <li class="deal-b" >
        <el-button size="mini" type="primary" icon="el-icon-search" @click="clickSearch">查询</el-button>
        <el-button size="mini" plain icon="el-icon-refresh-left" @click="clickReset">重置</el-button>
        <slot name="moreBtns"></slot>
        <li class="deal-b" @click="showCollapse" v-if="autoExpend.more">
          <i class="el-icon-arrow-down turnDown" v-if="!autoExpend.collapseVisible"></i>
          <i class="el-icon-arrow-up turnUp" v-if="autoExpend.collapseVisible"></i>
          <li v-if="!autoExpend.collapseVisible" class="more-words">更多筛选项</li>
          <li v-if="autoExpend.collapseVisible" class="more-words">收起筛选</li>
        </li>
      </li>
    </li>
  </li>
</template>
<script>
export default={
 data(){
  return{
     collapseData:{
       collapseVisible:false
     },
     //自动折叠显示更多筛选项
     autoExpend:{
       more:false,
       collapseVisible:false,
       hasTop:false,
       hasFilter:false
     },
  }
 },
 props:['maxWidth'],
  mounted(){
    this.watchScrollHeight()
    window.addEventListener("resize", () => {
      this.watchScrollHeight()
    });
  },
  methods:{
    clickSearch(){
     this.$emit('clickSearch')
   },
   clickReset(){
     this.$emit('clickReset')
   },
   showCollapse(){
     this.methods('showCollapse')
   },
   showCollapse(){
     this.autoExpend.collapseVisible = !this.autoExpend.collapseVisible
     this.$refs.filterCont.style.height = this.autoExpend.collapseVisible?'auto':'50px'
   }
 
   //尝试监控这个高度
   watchScrollHeight(){
     let filter = this.$refs.filter;
     if(filter){
       this.$nextTick(() => {
         this.autoExpend.more = $(filter).find(".colla-box")[0].scrollHeight > 50;
       })
       
     }
     //判断下面有没有元素节点 决定这个插槽是否显示
     //判断正常搜索框部位插槽
     if(this.$refs.filterCont&&this.$refs.filterCont.childNodes.length){
       this.autoExpend.hasFilter = true
     }
   }
  }
  
}
</script>
<style scoped lang="scss">
  .colla-wrap{
    width: 100%;
    .colla-box{
      max-width: calc(100% - 400px);
      float: left;
      box-sizing: border-box;
      overflow: hidden;
      height: 50px;
      >li,button{
        float: left;
        margin-right: 20px;
        margin-bottom: 20px;
      }
    }
    .ctrl{
      display: flex;
      align-items: flex-start;
      justify-content: flex-start;
      color: #409EFF;
      button{
        margin-right: 20px;
      }
      .deal-b{
        display: flex;
        align-items: flex-start;
        flex-wrap: nowrap;
        .deal-b{
          margin-right: 0;
          margin-bottom: 0;
          margin-top: 5px;
          display: flex;
          align-items: center;
          cursor: pointer;
          color: #409EFF;
          .more-words{
            min-width: 75px;
          }
          i{
            color: #409EFF;
            margin-right: 5px;
          }
        }
      }
    }
  }
</style>