vant van-pull-refresh + van-list实现list列表支持搜索和下拉刷新

1 介绍

在使用 van-pull-refresh + van-list实现list列表下拉刷新时遇到几个问题在这里进行一个总结。

2 出现的问题

问题一：当van-pull-refresh + van-list组合使用时，下拉刷新会调用两个加载图标。
解答：去除van-pull-refresh加载图标，防止下拉刷新时出现两个加载图标

      <!--  去除加载图标，防止下拉刷新时出现两个加载图标 --><template #loading><div></div></template>

问题二：通过筛选条件查询数据时，van-list会请求多次接口
解答：因为当this.finished = false时，会触发 onLoad 事件，onLoad方法会调用一次fetchData方法，onRefresh方法也会调用fetchData方法这就使得你会调用两次接口。所以我们只好把查询单独写一个方法onSearch，然后在onLoad中判断是不是刷新操作，如果说是刷新就设置为false，只调用onload方法。

    onSearch() {this.medicalList = []this.pageIndex = 1this.finished = falsethis.loading = truethis.refreshing = falsethis.fetchData()},onLoad() {if (this.refreshing) {this.medicalList = []this.refreshing = false}// 触底加载下一页数据// 网页刚打开也会触发一次this.fetchData()},// 下拉刷新onRefresh() {this.medicalList = []this.pageIndex = 1// finished 设置为 false 则会触发 onLoad 事件this.finished = falsethis.loading = truethis.fetchData()},

3 结果展示

这个页面叫做TreatmentStation分为两部分：顶部的搜索和中间的内容。中间的内容是一个单独的组件（MedicalList），是TreatmentStation的子组件，父组件通过传值的方式将查询条件传给子组件，子组件调用接口获取数据，渲染至页面。
在这里插入图片描述

4 代码实现

TreatmentStation 组件

<template><div id="treatment"><!-- 筛选条件 --><div class="filter-criteria"><van-searchv-model="model.keyword"placeholder="请输入患者姓名/就诊号"show-action@search="onSearch"><template #action><div style="display: flex; align-items: center;justify-content: center"><van-button size="small" type="info" @click="onSearch">搜索</van-button></div></template></van-search><van-dropdown-menu active-color="#1989fa"><van-dropdown-item ref="dateItem" v-model="model.appointTime" :title="model.appointTime.toString()"><van-datetime-pickerv-model="currentDate"title="选择日期"type="date"@cancel="onCancelDate"@confirm="onConfirmDate"/></van-dropdown-item><van-dropdown-item v-model="model.departmentName" :options="model.deptOption" @change="changeDropdown"/><van-dropdown-item v-model="model.my" :options="model.myOption" @change="changeDropdown"/></van-dropdown-menu></div><back-top/><!-- list--><medical-list ref="medicalList" :model="model"/></div>
</template><script>
import moment from 'moment'
import MedicalList from './components/medical-list.vue'
import api from '../../api'
import BackTop from '../../components/back-top.vue'export default {name: 'TreatmentStation',components: {BackTop, MedicalList},data() {return {model: {keyword: '',my: true,myOption: [{text: '我的', value: true},{text: '全部医师', value: false}],departmentName: '',deptOption: [{text: '全部科室', value: ''}],appointTime: ''},medicalList: [],pageIndex: 1,currentDate: new Date()}},mounted() {//this.model.appointTime = moment().format('YYYY-MM-DD')const sessionModel = JSON.parse(sessionStorage.getItem('sessionModel'))if (sessionModel !== null) {this.model = sessionModel}this.getDepartList()},methods: {// 搜索确定onSearch(val) {this.$refs.medicalList.onSearch()},// 搜索框取消按钮onCancel() {// Toast('取消')this.$refs.medicalList.onSearch()},onConfirmDate(value) {this.model.appointTime = moment(value).format('YYYY-MM-DD')this.$refs.dateItem.toggle()this.$refs.medicalList.onSearch()},onCancelDate() {// 收起this.$refs.dateItem.toggle()},changeDropdown(value) {this.$refs.medicalList.onSearch()},// 获取所有科室getDepartList() {api.getDepartment().then(res => {this.model.deptOption = res.data.map(item => ({text: item.name,value: item.name}))this.model.deptOption.unshift({text: '全部科室', value: ''})}).catch(error => {console.log(error)})}},beforeRouteLeave(to, from, next) {// 当路由跳转到治疗页面时存储sessionModelif (to.name === 'treatmentContent') {sessionStorage.setItem('sessionModel', JSON.stringify(this.model))} else {sessionStorage.removeItem('sessionModel')}next()}
}
</script><style scoped>
#treatment {height: 100%;
}
</style>

MedicalList组件

<template><div id="medical-list"><van-pull-refreshv-model="refreshing":class="{'content': activeClass}":offset="100"success-text="刷新成功"@refresh="onRefresh"><!--  去除加载图标，防止下拉刷新时出现两个加载图标 --><template #loading><div></div></template><van-listv-model="loading":finished="finished"finished-text="没有更多了"@load="onLoad"><van-cell v-for="item in medicalList" :key="item.id":to="{name:'treatmentContent',params:{medicalInfo_Id: item.id,appointTime: model.appointTime,patientName: item.patientName,patient_Id: item.patient_Id}}"is-linkstyle="text-align: left; align-items: center"><template #title><span style="margin-left: 10px">{{ item.patientName }}</span></template><template #label><span style="margin-left: 10px">{{ '就诊号: ' + item.medicalNo }}</span></template><template #default><span>{{ item.bedNumber ? '床号: ' + item.bedNumber : '' }}</span></template><template #icon><van-icon name="contact-o" size="25px"/></template></van-cell></van-list></van-pull-refresh></div>
</template>
<script>
import api from '../../../api'export default {name: 'MedicalList',props: ['model'],data() {return {medicalList: [],loading: false,finished: false,refreshing: false,pageIndex: 1,pageSize: 50,pullRefreshDisabled: false}},methods: {// list列表方法onLoad() {if (this.refreshing) {this.medicalList = []this.refreshing = false}// 触底加载下一页数据// 网页刚打开也会触发一次this.fetchData()},// 下拉刷新onRefresh() {this.medicalList = []this.pageIndex = 1// finished 设置为 false 则会触发 onLoad 事件this.finished = falsethis.loading = truethis.fetchData()},onSearch() {this.medicalList = []this.pageIndex = 1this.finished = falsethis.loading = truethis.refreshing = falsethis.fetchData()},// 获取就诊信息数据fetchData() {api.query({'page.index': this.pageIndex,'page.size': this.pageSize,My: this.model.my,keyword: this.model.keyword,appointTime: this.model.appointTime,departmentName: this.model.departmentName}).then(res => {if (!res.data) returnthis.medicalList = this.medicalList.concat(res.data.rows)// 所有数据加载完成if (this.medicalList.length >= res.data.total) {this.finished = true} else {this.pageIndex++}}).catch(error => {console.log(error)this.finished = true}).finally(() => {this.refreshing = falsethis.loading = false})},bedNumber(value) {return value ? '床号:' + value : ''}},computed: {activeClass() {return this.medicalList.length <= 5}}
}
</script>
<style scoped>
#medical-list {
}#medical-list .content {height: 80vh;
}
</style>

back-top组件
悬浮回到顶部按钮

<template><!--  回到顶部悬浮按钮--><div id="back-top"><van-sticky><van-icon v-if="showBackTop" class="back-to-top" name="back-top" size="20px" @click="scrollToTop"/></van-sticky></div>
</template>
<script>
export default {name: 'BackTop',data() {return {showBackTop: false}},beforeDestroy() {window.removeEventListener('scroll', this.handleScroll)},mounted() {window.addEventListener('scroll', this.handleScroll)},methods: {handleScroll() {this.showBackTop = window.pageYOffset >= 300},scrollToTop() {window.scrollTo({top: 0, behavior: 'smooth'})}}
}
</script><style scoped>
#back-top .back-to-top {position: fixed;bottom: 50px;right: 30px;padding: 15px 15px;background-color: whitesmoke;color: black;border-radius: 25px;cursor: pointer;z-index: 1000;
}</style>