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Vue 中在 Element Ui 对话框 Dialog 里使用 Select 选择器，选中内容，重新打开对话框 Dialog，Select 为默认值

问题描述：

在使用 vue+element 开发 Dialog 对话框的时候，点击一个按钮后，显示对话框，对话框填写数据使用下拉菜单展示并选择内容后，关闭模态框；再次打开对话框仍显示上次选中的数据。

具体实例：

点击“推送记录“按钮操作，弹出对话框；显示默认下拉为 “全部”，下拉选择 “已安装”，关闭对话框（点击取消或右上角x）；重新打开希望对话框中的下拉数据重置为默认 “全部” 状态。

分析原因：

如下代码中：
点击推送应用记录事件时，未初始推送状态的值为0 所导致再次点击打开对话框时还是显示上次下拉的状态；加上以下一段代码即可！

this.pushAppRecordModal.pushStatus = 0

① device / list.vue :


<template>
  <div class="app-container">
	··· ···
	<el-table-column
        align="center"
        fixed="right"
        :label="$t('global.text.operation')"
        width="220"
      >
        <template slot-scope="scope">
          <el-button type="text" icon="el-icon-mobile-phone" @click.native.prevent="handlePushAppRecord({deviceId: scope.row.id, realName: scope.row.realName, studentCode: scope.row.studentCode, tag: scope.row.tag})">
            {
   
   { $t('device.button.pushAppRecord') }}
          </el-button>
          <el-button type="text" icon="el-icon-connection" @click.native.prevent="handleBindParent(scope.row.id)">
            {
   
   { $t('device.button.bindParent') }}
          </el-button>
        </template>
      </el-table-column>

	<!-- 应用推送记录模态框 -->
    <el-dialog
      width="70%"
      top="2vh"
      class="app-management"
      :title="$t('device.text.pushAppRecordModal')"
      :visible.sync="pushAppRecordModal.dialogVisible"
      :close-on-click-modal="pushAppRecordModal.closeOnClickModal"
      custom-class="app-management"
    >
      <el-row class="device-info">
        <el-select v-model="pushAppRecordModal.pushStatus" @change="handleSelectPushStatus">
          <el-option
            v-for="item in pushStatusList"
            :key="item.value"
            :label="item.label"
            :value="item.value"
          />
        </el-select>
        &nbsp;&nbsp; 学生姓名：{
   
   { pushAppRecordModal.deviceInfo.realName }} &nbsp;&nbsp;&nbsp;&nbsp; 学号：{
   
   { pushAppRecordModal.deviceInfo.studentCode }} &nbsp;&nbsp;&nbsp;&nbsp; 设备标识： {
   
   { pushAppRecordModal.deviceInfo.tag }}
      </el-row>

      <el-row class="app-list">
        <el-row v-if="pushAppRecordModal.appList && pushAppRecordModal.appList.length > 0" class="panel" :gutter="20">
          <el-col v-for="item in pushAppRecordModal.appList" :key="item.id" :span="8">
            <AppItem :key="item.id" :oss-url="ossUrl" :w-desc-limit="10" :item="item" @on-delete-push-app-record="handleDeletePushAppRecord" />
          </el-col>
        </el-row>
        <el-row v-else class="app-empty" type="flex" align="middle" justify="center">
          暂无推送应用记录
        </el-row>
      </el-row>

      <div slot="footer">
        <el-button plain @click="handleClosePushAppRecordModal">{
   
   { $t('global.button.cancel') }}</el-button>
      </div>
    </el-dialog>

  </div>
</template>


<script>
import AppItem from './AppItem'


export default {
      
      
  components: {
      
       AppItem },

  data() {
      
      
    return {
      
      
		pushAppRecordModal: {
      
       // 推送应用记录模态框
        dialogVisible: false, // 是否展示
        pushStatus: 0, // 推送状态全部
        deviceInfo: {
      
      },
        appList: []
      }
    }
  },
  computed: {
      
      
		pushStatusList() {
      
      
      return [
        {
      
       label: this.$t('device.text.pushStatusAll'), value: 0 },
        {
      
       label: this.$t('device.text.pushStatus1'), value: 1 },
        {
      
       label: this.$t('device.text.pushStatus2'), value: 2 },
        {
      
       label: this.$t('device.text.pushStatus3'), value: 3 },
        {
      
       label: this.$t('device.text.pushStatus4'), value: 4 },
        {
      
       label: this.$t('device.text.pushStatus5'), value: 5 },
        {
      
       label: this.$t('device.text.pushStatus6'), value: 6 },
        {
      
       label: this.$t('device.text.pushStatus7'), value: 7 }
      ]
    }
  },
 methods: {
      
      
	/* 推送记录 */
    // 点击推送应用记录事件
    handlePushAppRecord(_deviceInfo) {
      
      
      this.pushAppRecordModal.deviceInfo = _deviceInfo
      //this.pushAppRecordModal.title = this.$t('device.text.pushAppRecordModal')
      this.pushAppRecordModal.pushStatus = 0
      this.queryPushAppRecordList()
    },
    // 查询推送记录
    queryPushAppRecordList() {
      
      
      const data = {
      
      
        deviceId: this.pushAppRecordModal.deviceInfo.deviceId,
        pushStatus: this.pushAppRecordModal.pushStatus
      }
      list(data).then(response => {
      
      
        this.pushAppRecordModal.appList = response.data
        this.pushAppRecordModal.dialogVisible = true
      })
    },
    // 点击推送应用选中列表触发事件
    handleSelectPushStatus() {
      
      
      this.queryPushAppRecordList()
    },
    // 删除推送记录事件
    handleDeletePushAppRecord(_id) {
      
      
      this.$confirm(this.$t('global.message.delete'), this.$t('global.text.tips'), {
      
      
        confirmButtonText: this.$t('global.button.confirm'),
        cancelButtonText: this.$t('global.button.cancel'),
        type: 'warning'
      }).then(() => {
      
      
        this.deletePushAppRecord(_id)
      }).catch(() => {
      
      
        this.$message({
      
      
          type: 'info',
          message: this.$t('global.message.cancelDelete')
        })
      })
    },
    // 删除推送记录
    deletePushAppRecord(_id) {
      
      
      deleteById(_id).then(response => {
      
      
        this.$message.success(response.msg)
        this.queryPushAppRecordList()
      })
    }
    // 关闭推送应用模态框事件
    handleClosePushAppRecordModal() {
      
      
      this.pushAppRecordModal.dialogVisible = false
    },
  }
}
</script>

② 国际化 lang / zh_cn.js：


export default {
    
    

  device: {
    
    
    text: {
    
    
	  pushAppRecordModal: '推送应用记录',
      pushStatusAll: '全部',
      pushStatus1: '已推送',
      pushStatus2: '已安装',
      pushStatus3: '卸载中',
      pushStatus4: '已卸载',
      pushStatus5: '申请中',
      pushStatus6: '已同意',
      pushStatus7: '已拒绝'
    },
}

③ 引入组件 device / AppItem.vue：


<template>
  <el-row class="app-item" type="flex" align="middle" justify="space-between">
    <el-row type="flex" justify="start">
      <el-row type="flex" align="middle">
        <el-avatar shape="square" :src="ossUrl + item.iconUrl" />
      </el-row>
      <el-row class="app-info" type="flex" align="middle">
        <el-row>
          <el-row class="app-name">
            {
   
   { item.name }}
          </el-row>
          <el-row class="app-wDesc" type="flex" align="middle">
            <dev class="push-status" :class="item.pushStatus == 3 ? 'text-blue' : item.pushStatus == 7 ? 'text-red' : 'text-gray' ">{
   
   { item.pushStatus | pushStatusFilter }}</dev>
            <div class="file-size">{
   
   { item.fileSize + 'M' }}</div>
          </el-row>
        </el-row>
      </el-row>
    </el-row>
    <el-row>
      <el-button v-if="item.pushStatus == 1 || item.pushStatus == 3" type="primary" size="mini" class="delete-btn" round @click="handleDeletePushAppRecord(item.id)">
        {
   
   { $t('global.button.delete') }}
      </el-button>
    </el-row>
  </el-row>
</template>

<script>
export default {
      
      
  name: 'ResourceTips',
  filters: {
      
      
    pushStatusFilter(pushStatus) {
      
      
      if (pushStatus === 1) {
      
      
        return '已推送'
      } else if (pushStatus === 2) {
      
      
        return '已安装'
      } else if (pushStatus === 3) {
      
      
        return '卸载中'
      } else if (pushStatus === 4) {
      
      
        return '已卸载'
      } else if (pushStatus === 5) {
      
      
        return '申请中'
      } else if (pushStatus === 6) {
      
      
        return '已同意'
      } else if (pushStatus === 7) {
      
      
        return '已拒绝'
      } else {
      
      
        return '待推送'
      }
    }
  },
  props: {
      
      
    item: {
      
      
      type: Object,
      default() {
      
      
        return {
      
      }
      }
    },
    ossUrl: {
      
      
      type: String,
      default: ''
    },
    wDescLimit: {
      
      
      type: Number,
      default: 15
    }
  },
  methods: {
      
      
    // 删除推送记录
    handleDeletePushAppRecord(_id) {
      
      
      this.$emit('on-delete-push-app-record', _id)
    }
  }
}
</script>
<style lang="scss" scoped>
.app-item {
      
      
  height: 64px;
  width: 100%;
  margin: 10px 0px 10px 0px;
  padding: 10px 10px;
  border-radius: 13px;
  box-shadow: 0px 1px 3px 0 rgba(0, 0, 0, 0.2);
  .app-info {
      
      
    margin-left: 10px;
  }
  .app-name {
      
      
    font-size: 15px;
  }
  .app-wDesc {
      
      
    margin-top: 3px;
  }
  .file-size {
      
      
    font-size: 8px;
    color: #aaa;
  }
  .push-status {
      
      
    margin-right: 4px;
    font-size: 13px!important;
  }
  .text-gray {
      
      
    color: #aaaaaa;
  }
  .text-blue {
      
      
    color: #4966F5;
  }
  .text-red {
      
      
    color: #e54d42;
  }
  .el-avatar--square {
      
      
    border-radius: 8px;
  }
  .delete-btn {
      
      
    padding: 5px 10px;
  }
}
</style>

另外判断推送应用列表状态为 1或 3 时，只显示删除按钮并且可删除，其它状态则不显示：

如上代码在组件 AppItem.vue 中点击删除按钮前需判断即可:

v-if=“item.pushStatus == 1 || item.pushStatus == 3”

在这里插入图片描述

解决方法：

首先要从点击对话框入口操作按钮开始：

handlePushAppRecord 点击处理推送应用记录事件后弹出对话框；
queryPushAppRecordList 查询推送记录
handleSelectPushStatus 点击推送应用下拉选中状态列表触发事件
handleDeletePushAppRecord 删除推送记录事件
deletePushAppRecord 删除推送记录
handleClosePushAppRecordModal 关闭推送应用模态框事件

handleDeletePushAppRecord 时需先判断指定的状态自定义显示删除按钮

Note:
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Vue 对话框 Dialog 重新打开后数据重置/清空遗留问题

Vue 中在 Element Ui 对话框 Dialog 里使用 Select 选择器，选中内容，重新打开对话框 Dialog，Select 为默认值

问题描述：

具体实例：

分析原因：

解决方法：

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