el-upload 上传文件和上传图片的基本用法

el-upload 上传excel

<template>
  <el-form :model="form">
    <el-form-item label="上传文件" :label-width="formLabelWidth">
      <el-upload
        ref="uploadExcel"
        action="https://jsonplaceholder.typicode.com/posts/"
        :limit=limitNum
        :auto-upload="false"
        accept=".xlsx"
        :before-upload="beforeUploadFile"
        :on-change="fileChange"
        :on-exceed="exceedFile"
        :on-success="handleSuccess"
        :on-error="handleError"
        :file-list="fileList">
        <el-button size="small" plain>选择文件</el-button>
        <div slot="tip" class="el-upload__tip">只能上传xlsx(Excel2007)文件，且不超过10M</div>
      </el-upload>
    </el-form-item>
    <el-form-item>
      <el-button size="small" type="primary" @click="uploadFile">立即上传</el-button>
      <el-button size="small">取消</el-button>
    </el-form-item>
  </el-form>
</template>

<script>
import axios from 'axios'
export default {
  data() {
    return {
      limitNum: 1,
      formLabelWidth: '80px',
      form: {
        file: ''
      },
      fileList: []
    }
  },
  methods: {
    // 文件超出个数限制时的钩子
    exceedFile(files, fileList) {
      this.$notify.warning({
        title: '警告',
        message: `只能选择 ${this.limitNum} 个文件，当前共选择了 ${files.length + fileList.length} 个`
      });
    },
    // 文件状态改变时的钩子
    fileChange(file, fileList) {
      console.log('change')
      console.log(file)
      this.form.file = file.raw
      console.log(this.form.file)
      console.log(fileList)
    },
    // 上传文件之前的钩子, 参数为上传的文件,若返回 false 或者返回 Promise 且被 reject，则停止上传
    beforeUploadFile(file) {
      console.log('before upload')
      console.log(file)
      let extension = file.name.substring(file.name.lastIndexOf('.')+1)
      let size = file.size / 1024 / 1024
      if(extension !== 'xlsx') {
        this.$notify.warning({
          title: '警告',
          message: `只能上传Excel2017（即后缀是.xlsx）的文件`
        });
      }
      if(size > 10) {
        this.$notify.warning({
          title: '警告',
          message: `文件大小不得超过10M`
        });
      }
    },
    // 文件上传成功时的钩子
    handleSuccess(res, file, fileList) {
      this.$notify.success({
        title: '成功',
        message: `文件上传成功`
      });
    },
    // 文件上传失败时的钩子
    handleError(err, file, fileList) {
      this.$notify.error({
        title: '错误',
        message: `文件上传失败`
      });
    },
    uploadFile() {
      this.$refs.uploadExcel.submit()
      /*
      let formData = new FormData()
      formData.append('file', this.form.file)
      axios.post('https://jsonplaceholder.typicode.com/posts/', 
        formData,
        { "Content-Type": "multipart/form-data" }
      )
      .then(res => {
        console.log('res')
        console.log(res)
      })
      .catch(err => {

      })
      */
    }
  }
}
</script>

<style lang="scss" scoped>

</style>

el-upload 上传图片

<template>
  <el-form :model="form">
    <el-form-item label="上传图片" :label-width="formLabelWidth">
      <el-upload
        ref="upload"
        action="#"
        accept="image/png,image/gif,image/jpg,image/jpeg"
        list-type="picture-card"
        :limit=limitNum
        :auto-upload="false"
        :on-exceed="handleExceed"
        :before-upload="handleBeforeUpload"
        :on-preview="handlePictureCardPreview"
        :on-remove="handleRemove">
        <i class="el-icon-plus"></i>
      </el-upload>
      <el-dialog :visible.sync="dialogVisible">
        <img width="100%" :src="dialogImageUrl" alt="">
      </el-dialog>
    </el-form-item>
    <el-form-item>
      <el-button size="small" type="primary" @click="uploadFile">立即上传</el-button>
      <el-button size="small">取消</el-button>
    </el-form-item>
  </el-form>
</template>

<script>
export default {
  data() {
    return{
      dialogImageUrl: '',
      dialogVisible: false,
      formLabelWidth: '80px',
      limitNum: 3,
      form: {}
    }
  },
  methods: {
    // 上传文件之前的钩子
    handleBeforeUpload(file){
      console.log('before')
      if(!(file.type === 'image/png' || file.type === 'image/gif' || file.type === 'image/jpg' || file.type === 'image/jpeg')) {
        this.$notify.warning({
          title: '警告',
          message: '请上传格式为image/png, image/gif, image/jpg, image/jpeg的图片'
        })
      }
      let size = file.size / 1024 / 1024 / 2
      if(size > 2) {
        this.$notify.warning({
          title: '警告',
          message: '图片大小必须小于2M'
        })
      }
    },
    // 文件超出个数限制时的钩子
    handleExceed(files, fileList) {

    },
    // 文件列表移除文件时的钩子
    handleRemove(file, fileList) {
      console.log(file, fileList);
    },
    // 点击文件列表中已上传的文件时的钩子
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    uploadFile() {
      this.$refs.upload.submit()
    }
  } 
}
</script>

<style lang="scss" scoped>

</style>