# select加上multiple属性后,默认触发change事件进行验证

created() {
	this.$nextTick(()=>{
	  this.$refs.ruleFormRef.resetFields();
	})
}

# 上传控件为必填项,上传图片后清空提示信息

只需要在上传组件上绑定ref,在on-success钩子中调用this.$refs.XXX.clearValidate(),就可以清除

 this.$refs.image.clearValidate();

# 进行校验后控制台提示async-validator验证警告

  • 在node_modules文件夹中找到async-validator文件夹中的es下的util.js文件,整个的路径:node_modules > async-validator > es > util.js
  • 注释util.js中的输出日志(14行),注释掉即可

# el-dropdown-item / el-breadcrumb-item 点击无效

在使用 element-ui 组件库时,经常会用到类似 el-breadcrumb面包屑 或者 Dropdown下拉菜单的组件。有时需要在子项上添
加click事件,但是官⽅⽂档中并没有给出 el-dropdown-item / el-breadcrumb-item 的点击事件
若直接在el-dropdown-item / el-breadcrumb-item上添加click事件,点击后没有任何反应
在click后添加 .native 修饰符,则可解决问题,修饰符 .native -- 可用于监听组件根元素的原生事件

<el-dropdown>
<span class="el-dropdown-link">
下拉菜单<i class="el-icon-arrow-down el-icon--right"></i>
</span>
<el-dropdown-menu slot="dropdown">
<el-dropdown-item @click.native="handleClick">黄⾦糕</el-dropdown-item>
<el-dropdown-item @click.native="handleClick">狮⼦头</el-dropdown-item>
<el-dropdown-item @click.native="handleClick">螺蛳粉</el-dropdown-item>
</el-dropdown-menu>
</el-dropdown>

<el-breadcrumb separator-class="el-icon-arrow-right">
<el-breadcrumb-item :to="{ path: '/' }">⾸页</el-breadcrumb-item>
<el-breadcrumb-item @click.native="handleClcik">活动管理</el-breadcrumb-item>
<el-breadcrumb-item @click.native="handleClcik"活动列表</el-breadcrumb-item>
<el-breadcrumb-item @click.native="handleClcik">活动详情</el-breadcrumb-item>
</el-breadcrumb>

# el-date-picker 动态限制时间范围,精确到分秒

<el-form-item prop="timeData">
  <el-date-picker type="datetime"  v-model="form.timeData.valueStart" :picker-options="pickerOptionsTwo" placeholder="请选择开始时间" @change="valueStartBtn" popper-class="DateTimePicker">
  </el-date-picker>
  <el-date-picker type="datetime"  v-model="form.timeData.valueEnd" :picker-options="pickerOptions"  placeholder="请选择结束时间" @change="valueEndBtn" popper-class="DateTimePicker">
  </el-date-picker>
  <!-- <el-date-picker v-model="value1" format="yyyy-MM-dd HH:mm" type="datetimerange" range-separator="至" start-placeholder="开始日期"
	end-placeholder="结束日期" popper-class="DateTimePicker">
  </el-date-picker> -->
</el-form-item>

<script>
export default{
	data(){
		return {
			pickerOptionsTwo: {
				// step: '00:10:00',
				// start: '00:00:00',
				// end: '20:59:59',
				// 时间不能大于当前时间
				disabledDate(time) {
				  return time.getTime() < Date.now() - 3600 * 24 * 1000
				},
				selectableRange: '00:00:00 - 23:59:59',
				format:'HH:mm'
			},
		
			//时间框设置
			pickerOptions: {
				selectableRange: '00:00:00 23:59:59',
				format:'HH:mm',
				disabledDate: (time) => {
				  return time.getTime() > this.form.timeData.valueStart + 3600 * 4 * 1000 || time.getTime() < Date.now() - 3600 * 24 * 1000
				}
			},
		}
	},
	watch: {
		'form.timeData.valueStart': {
		      handler(newName, oldName) {
		        // moment(this.form.timeData.valueStart).format('YYYY-MM-DD') === moment(Date.now()).format('YYYY-MM-DD') ?  :
		        if (moment(newName).format('YYYY-MM-DD') === moment(Date.now()).format('YYYY-MM-DD')) {
		          console.log(newName)
		          this.pickerOptionsTwo.selectableRange = `${moment(new Date().getTime()).format('HH:mm:ss')} - 23:59:59`
		        } else {
		          this.pickerOptionsTwo.selectableRange = '00:00:00 - 23:59:59'
		        }
		      },
		      deep: true,
		      immediate: true
		},
	    'form.timeData.valueEnd': {
	      handler(newName, oldName) {
	        const dateDiff = moment(moment(this.form.timeData.valueStart).subtract(-1, 'day').format('YYYY-MM-DD')).diff(moment(this.form.timeData.valueStart), 'm')
	        if (dateDiff >= 240) {
	          this.pickerOptions.selectableRange = `${moment(this.form.timeData.valueStart).format('HH:mm:ss')} - ${moment(this.form.timeData.valueStart + 3600 * 4 * 1000).format('HH:mm:ss')}`
	        } else {
	          if (moment(this.form.timeData.valueStart).format('YYYY-MM-DD') === moment(newName).format('YYYY-MM-DD')) {
	            this.pickerOptions.selectableRange = `${moment(this.form.timeData.valueStart).format('HH:mm:ss')} - 23:59:59`
	          } else {
	            this.pickerOptions.selectableRange = `00:00:00 -  ${moment(this.form.timeData.valueStart + 3600 * 4 * 1000).format('HH:mm:ss')}`
	          }
	        }
	      },
	      deep: true,
	      immediate: true
	    }
	}
}
</script>

# table表头超出隐藏

<el-table>
  <el-table-column v-for="item in headerList" 
                   :prop="item.prop" :label="item.label :key="item.prop>
    <template slot="header" slot-scope="scope">
      <el-tooltip :content="scope.column.label">
        <span>{{scope.column.label}}</span>
      </el-tooltip>
    </template>
  </el-table-column>
</el-table>

<style>
.el-table{  
  th{
    .cell{
      white-space:nowrap !important;
      text-overflow:ellipsis;
      word-break:break-all;
    }
  }  
}
</style>

# clearValidate()和resetFields()清除表单校验的区别

# clearValidate的使用

<Form ref="form" rule={this.rules}>
	<FormItem prop="name" label="姓名">
		<Input/>
	</FormItem>
	<FormItem prop="age" label="年龄">
		<Input/>
	</FormItem>
</Form>
// 根据判断条件, 移除所有表单项的校验
if (/*条件*/) {
	this.$refs['form'].clearValidate();
}

// 但是有时候只需要移除其中的某一项校验, 如只移除姓名的校验:
if (/*条件*/) {
	this.$refs['form'].clearValidate(['name']);
}

注意

有可能this.refs[form].clearValidate()方式不识别。需要使用:this.refs.form.clearValidate()

# element-ui中的表单校验

<el-form :label-width="120" :rules="formRules" :model="form" ref="form">
  <el-form-item label="活动名称" prop="name">
    <el-input v-model="form.name"></el-input>
  </el-form-item>
</el-form>
<el-button type="info" @click="save">保存</el-button>
<el-button type="info" @click="empty">重置</el-button>
// 校验规则
formRules: {
     name: [
            { required: true, message: '请输入活动名称', trigger: 'blur' },
            { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
     ],
}
/**
 * 保存函数
 */
save() { 
  this.$refs[form].validate((valid) => {
      if (valid) {
        alert('submit!');
      } else {
        console.log('error submit!!');
        return false;
      }
    });
  }
})
empty() { 
  /**
   * 移除校验结果并重置字段值
   * 注:清除表单项name的校验及数值
   */
  this.$refs.form.resetFields(); 
  /**
   * 移除校验结果
   * 注:只清除表单项name的校验,不清楚表单项name的数值
   */
  this.$refs.form.clearValidate('name'); 
})

# 二者的区别

this.$refs.form.resetFields(); //移除校验结果并重置字段值
this.$refs.form.clearValidate(); //移除校验结果

# http-request 上传附件,并且还可以传参数

 <el-upload
    class="upload-demo"
    action=""
    :headers="importHeaders"
    :http-request="(file)=>{return imggreySuccess(file ,scope.row)}"
    multiple
    :limit="3"
    :file-list="fileList"
  >
<el-button size="small">
  点击上传
</el-button>
<div slot="tip" class="el-upload__tip">
  可上传多个附件,且每个附件不超过2M
</div>
methods: {
    imggreySuccess(params, row) {
      const isLt2M = params.file.size / 1024 / 1024 < 2

      // 通过 FormData 对象上传文件
      var formData = new FormData()
      formData.append('file', params.file)
      // formData.append('FileName', params.file.name)
      if (!isLt2M) {
        this.$message.error('请上传2M以下的文件')
        return false
      }
      // 设置header
      this.importHeaders['X-AUTH-TOKEN'] = Cookies.get('X-AUTH-TOKEN') // token
      this.upLoadData.fileType = `winBidNoticeAttachment_${row.typecode}`// 文件类型
      axios.post(`${this.upLoadFileUrl}${createURL(this.upLoadData)}`, formData, { 
			  headers: { 'X-AUTH-TOKEN': Cookies.get('X-AUTH-TOKEN') }
		   })
        .then(function(res) {
        })
        .catch(function(err) {
          console.error(err)
        })
      // 校验是否每条数据至少有一条数据 数据整理
      // const fileObj = Object.assign(file)
      // this.fileLists = this.performanceData
      // this.fileLists.map(item => {
      //   if (item.typecode === row.typecode) {
      //     this.arrBuff.push(fileObj)
      //     item.arr = this.arrBuff
      //     return
      //   }
      // })
    }
}

# el-cascader 多选设置默认值

<el-cascader v-model="value" :options="options" :props="props" @change="handleChange" />
data(){
	return {
		props:{ multiple: true },
		value:["5","6,11","7"],
		options:[{
		  value: 1,
		  label: '东南',
		  children: [{
			value: 2,
			label: '上海',
			children: [
			  { value: 3, label: '普陀' },
			  { value: 4, label: '黄埔' },
			  { value: 5, label: '徐汇' }
			]
		  }]
		}]
	}
}

# 重置表单

<!--el-form 中必须包含3个属性:model、ref、prop-->
<el-form :model="queryParams" ref="queryForm" label-width="150px">
	<el-col :span="6">
		<el-form-item label="调查表名" prop="codeTablename">
			<el-select v-model="queryParams.code" placeholder="请选择调查表名" clearable>
				<el-option v-for="(a, i) in list" :key="i" :label="a.name" :value="a.id"/>
			</el-select>
		</el-form-item>
	</el-col>
</el-form>