vue element 调试图片上传功能

2021年4月8日 23:18 by wst

vue

---

需求

完成图片上传功能，商品由封面图片（单张）和内容图片（多张）组成；

1. 显示图片预览，即响应中生成的图片url；

2. 实时修改图片，即通过已上传图片列表来删除或增加；

3. 封面图片和内容图片没有关系，相互独立；

4. 完全以来element ui 的upload组件实现；

5. 前后端分离开发；

 

心历路程

问题1：图片上传的action存在跨域问题。

方案：设置开发代理（vue.config.js）

module.exports = {
    baseUrl: './',
    assetsDir: 'static',
    productionSourceMap: false,
    devServer: {
        proxy: {
            '/api':{
                target:'https://api.xxxxx.com',
                // target:'',
                changeOrigin:true,
                pathRewrite:{
                    '^/api':''
                }
            }
        }
    }
}

问题2：自己实现http-request，即自定义上传函数。但是和后续的函数无法对接，如上传成功回调。

方案：

（1）自定义（请求级别）上传功能，这里的request是经过axios重写过的，想知道怎么重写请百度。

export function upload_image(query){
    return request({
        url: '/boss/admin/upload/image',
        method: 'post',
        data: query,
        headers: {'Content-Type': 'multipart/form-data'}
    })
}

（2）组装formData数据并上传。

import { upload_image } from "../../api/index";

upLoadImage(param){
      let formData = new FormData();
      formData.append("file", param.file);
      formData.append("files", param.files);
      upload_image(formData).then(res=>{
        this.form.file = res.data.file
      })
}

问题3：为什么衔接不起来，问题出在哪里，百度、谷歌无果。只能去看源码。

方案：定制化action--"/api/boss/admin/upload/image"。思考：为什么不是"/boss/admin/upload/image"？

 <el-form-item label="商品封面">
          <el-upload 
          :action="uploadActionUrl"
          :headers="myHeader"
          :before-upload="beforeAvatarUpload"
          :file-list="[form.file]"
          :on-remove="handelAvatarRemove"
          :on-exceed="handleAvatarExceed"
          :on-success="upLoadAvatarSuccess"
          accept="image/png, image/jpg, image/jpeg"
          list-type="picture-card"
          multiple
          :limit="1"
          >
            <el-button size="small" type="primary">点击上传</el-button>
            <div slot="tip" class="el-upload__tip">请上传图片格式文件</div>
          </el-upload>
        </el-form-item>

问题4：为了功能更友好，添加各种提示；

方案：（1）上传前图片格式和大小的验证beforeAvatarUpload；（2）上传成功回调upLoadAvatarSuccess；

(3）已卡片形式显示已上传的图片list-type="picture-card"；（4）其他操作，如上传个数限制、headers定制；

最终方案

<template>
  <div>
    <!-- 导航条 -->
    <div class="crumbs">
      <el-breadcrumb separator="/">
        <el-breadcrumb-item>
          <i class="el-icon-lx-goods"></i> 商品管理
        </el-breadcrumb-item>
        <el-breadcrumb-item>我的商品</el-breadcrumb-item>
      </el-breadcrumb>
    </div>

    <div class="container">
      <!-- 搜索框 -->
      <div class="handle-box">
        <el-button
          type="primary"
          icon="el-icon-delete"
          class="handle-del mr10"
          @click="delAllSelection"
          >批量删除</el-button
        >
        <el-input
          v-model="query.com_name"
          placeholder="商品名称"
          class="handle-input mr10"
        ></el-input>
        <el-input
          v-model="query.com_id"
          placeholder="商品ID"
          class="handle-input mr10"
        ></el-input>
        <el-select
          v-model="query.status"
          placeholder="上架状态"
          class="handle-select mr10"
        >
          <el-option key="1" label="已上架" value="1"></el-option>
          <el-option key="2" label="已下架" value="0"></el-option>
        </el-select>
        <el-select
          v-model="query.display_type"
          placeholder="展示类型"
          class="handle-select mr10"
        >
          <el-option key="0" label="全部商品" value="0"></el-option>
          <el-option key="1" label="新人商品" value="1"></el-option>
          <el-option key="2" label="热门商品" value="2"></el-option>
          <el-option key="3" label="促销商品" value="3"></el-option>
        </el-select>
        <el-date-picker
          class="ml10 mr10"
          v-model="query.date"
          value-format="yyyy-MM-dd"
          type="daterange"
          :unlink-panels="true"
          :clearable="false"
        >
        </el-date-picker>
        <el-button type="primary" icon="el-icon-search" @click="handleSearch"
          >搜索</el-button
        >
        <el-button type="primary" icon="el-icon-close" @click="handleReset"
          >重置</el-button
        >
        <el-button type="primary" @click="handleAdd"
          ><i class="el-icon-plus"></i
        ></el-button>
      </div>

      <!-- 表格内容 -->
      <el-table
        :data="tableData"
        border
        class="table"
        ref="multipleTable"
        header-cell-class-name="table-header"
        @selection-change="handleSelectionChange"
      >
        <el-table-column
          type="selection"
          width="55"
          align="center"
        ></el-table-column>
        <el-table-column
          prop="id"
          label="ID"
          width="55"
          align="center"
        ></el-table-column>
        <el-table-column prop="name" label="商品名"></el-table-column>
        <el-table-column label="成本">
          <template slot-scope="scope">￥{{ scope.row.cost }}</template>
        </el-table-column>
        <el-table-column label="售价">
          <template slot-scope="scope">￥{{ scope.row.price }}</template>
        </el-table-column>
        <el-table-column label="商品封面" align="center">
          <template slot-scope="scope">
            <el-image
              class="table-td-thumb"
              :src="scope.row.pic_url"
              :preview-src-list="[scope.row.pic_url]"
            ></el-image>
          </template>
        </el-table-column>
        <el-table-column
          prop="service_time"
          label="服务时长(分钟)"
        ></el-table-column>
        <el-table-column prop="display_type" label="展示类型"></el-table-column>
        <el-table-column label="上架状态" align="center">
          <template slot-scope="scope">
            <el-tag
              :type="
                scope.row.status === '成功'
                  ? 'success'
                  : scope.row.status === '失败'
                  ? 'danger'
                  : ''
              "
              >{{ scope.row.status == 1 ? "已上架" : "已下架" }}</el-tag
            >
          </template>
        </el-table-column>

        <el-table-column prop="create_time" label="注册时间"></el-table-column>
        <el-table-column label="操作" width="180" align="center">
          <template slot-scope="scope">
            <el-button
              type="text"
              icon="el-icon-edit"
              @click="handleEdit(scope.$index, scope.row)"
              >编辑</el-button
            >
            <el-button
              type="text"
              icon="el-icon-delete"
              class="red"
              @click="handleDelete(scope.$index, scope.row)"
              >删除</el-button
            >
          </template>
        </el-table-column>
      </el-table>
      <div class="pagination">
        <el-pagination
          background
          layout="total, prev, pager, next"
          :current-page="query.pageIndex"
          :page-size="query.pageSize"
          :total="dataCount"
          @current-change="handlePageChange"
        ></el-pagination>
      </div>
    </div>

    <!-- 编辑弹出框 -->
    <el-dialog title="编辑" :visible.sync="editVisible" width="50%">
      <el-form ref="form" :model="form" label-width="70px">
        <el-form-item label="商品名">
          <el-input v-model="form.name"></el-input>
        </el-form-item>
        <!-- 图片封面 -->
        <el-form-item label="商品封面">
          <el-upload 
          :action="uploadActionUrl"
          :headers="myHeader"
          :before-upload="beforeAvatarUpload"
          :file-list="[form.file]"
          :on-remove="handelAvatarRemove"
          :on-exceed="handleAvatarExceed"
          :on-success="upLoadAvatarSuccess"
          accept="image/png, image/jpg, image/jpeg"
          list-type="picture-card"
          multiple
          :limit="1"
          >
            <el-button size="small" type="primary">点击上传</el-button>
            <div slot="tip" class="el-upload__tip">请上传图片格式文件</div>
          </el-upload>
        </el-form-item>
        <!-- 图片列表 -->
        <el-form-item label="内容图片">
          <el-upload 
            :action="uploadActionUrl"
            :on-remove="onRemoveImg"
            :on-success="upLoadSuccess"
            :on-error="uploadError"
            :on-exceed="handleExceed"
            :before-upload="beforeAvatarUpload"
            accept="image/jpeg,image/gif,image/png"
            list-type="picture-card"
            multiple
            :limit="3"
            :headers="myHeader"
            :file-list="form.files">
            <el-button size="small" type="primary">点击上传</el-button>
            <div slot="tip" class="el-upload__tip">请上传图片格式文件，可多选，但不能超过<el-tag type="danger">3</el-tag>张.</div>
          </el-upload>
        </el-form-item>
        <el-form-item label="成本">
          <el-input v-model="form.cost"></el-input>
        </el-form-item>
        <el-form-item label="售价">
          <el-input v-model="form.price"></el-input>
        </el-form-item>
        <el-form-item label="服务时长">
          <el-input v-model="form.service_time"></el-input>
        </el-form-item>
        <el-form-item label="商品简介">
          <el-input type="textarea" rows="5" v-model="form.desc"></el-input>
        </el-form-item>
        <el-form-item label="商品描述">
          <el-input type="textarea" rows="5" v-model="form.content"></el-input>
        </el-form-item>
        <el-form-item label="商品亮点">
          <el-checkbox-group v-model="form.tags">
            <el-checkbox label="快速" name="type"></el-checkbox>
            <el-checkbox label="实惠" name="type"></el-checkbox>
            <el-checkbox label="热心" name="type"></el-checkbox>
          </el-checkbox-group>
        </el-form-item>
        <el-form-item label="展示类型">
          <el-select v-model="form.display_type" placeholder="展示类型">
            <el-option key="bbk" label="新人商品" value="1"></el-option>
            <el-option key="xtc" label="热门商品" value="2"></el-option>
            <el-option key="imoo" label="促销商品" value="3"></el-option>
          </el-select>
        </el-form-item>
        <el-form-item label="上架状态">
          <el-select v-model="form.status" placeholder="上架状态">
            <el-option key="bbk" label="已上线" value="1"></el-option>
            <el-option key="xtc" label="已下线" value="0"></el-option>
          </el-select>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveEdit">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import { admin_commodity, upload_image } from "../../api/index";
import { prevDate } from "element-ui/lib/utils/date-util";
import { parseTime } from "@/utils/date";
export default {
  name: "basetable",
  data() {
    return {
      myHeader: {session: 'test'},
      uploadActionUrl: "/api/boss/admin/upload/image",
      query: {
        status: null,
        display_type: null,
        com_name: null,
        com_id: null,
        pageIndex: 1,
        pageSize: 10,
        date: [
          // 默认时间区间
          parseTime(prevDate(new Date(), 30), "{y}-{m}-{d}"),
          parseTime(new Date(), "{y}-{m}-{d}"),
        ],
      },
      tableData: [],
      multipleSelection: [],
      delList: [],
      editVisible: false,
      dataCount: 0,
      form: {},
      idx: -1,
      id: -1,
    };
  },
  created() {
    this.getData();
  },
  methods: {
    // 获取 easy-mock 的模拟数据
    getData() {
      var query = {
        status: this.query.status,
        display_type: this.query.display_type,
        name: this.query.com_name,
        id: this.query.com_id,
        start: this.query.date[0],
        end: this.query.date[1],
        page_size: this.query.pageSize,
        page_index: this.query.pageIndex,
      };
      // console.log("query:", query);
      admin_commodity(query).then((res) => {
        // console.log(res);
        this.tableData = res.data;
        this.dataCount =
          this.query.pageIndex == 1 ? res.data.total : this.dataCount;
      });
    },
    // 触发搜索按钮
    handleSearch() {
      if (this.query.status == null) {
        this.$message.error("请选择上架状态");
        return false;
      } else if (this.query.display_type == null) {
        this.$message.error("请选择展示类型");
        return false;
      }
      this.$set(this.query, "pageIndex", 1);
      this.getData();
    },
    // 重置操作
    handleReset() {
      this.query.status = null;
      this.query.display_type = null;
      this.query.com_name = null;
      this.query.com_id = null;
    },
    // 删除操作
    handleDelete(index, row) {
      // 二次确认删除
      this.$confirm("确定要删除吗？", "提示", {
        type: "warning",
      })
        .then(() => {
          this.$message.success("删除成功");
          this.tableData.splice(index, 1);
        })
        .catch(() => {});
    },
    // 多选操作
    handleSelectionChange(val) {
      this.multipleSelection = val;
    },
    delAllSelection() {
      const length = this.multipleSelection.length;
      let str = "";
      this.delList = this.delList.concat(this.multipleSelection);
      for (let i = 0; i < length; i++) {
        str += this.multipleSelection[i].name + " ";
      }
      this.$message.error(`删除了${str}`);
      this.multipleSelection = [];
    },
    // 编辑操作
    handleEdit(index, row) {
      this.idx = index;
      this.form = row;
      this.form.file = {name: row.pic_url.split("/")[row.pic_url.split("/").length-1], url: row.pic_url};
      this.form.files = row.pic_list.map(x=>{return {name:x.split("/")[x.split("/").length-1], url:x}});
      this.editVisible = true;
    },
    // 添加操作
    handleAdd(index, row) {
      this.form.file = null;
      this.editVisible = true;
    },
    // 保存编辑
    saveEdit() {
      this.editVisible = false;
      this.$message.success(`修改第 ${this.idx + 1} 行成功`);
      this.$set(this.tableData, this.idx, this.form);
    },
    // 分页导航
    handlePageChange(val) {
      this.$set(this.query, "pageIndex", val);
      this.getData();
    },
    // ---单张图片开始---
    handleAvatarExceed(files, fileList) { //上传个数超出时的处理
      this.$message.warning(`当前限制选择 1 个文件，本次选择了 ${files.length} 个文件，共选择了 ${files.length + fileList.length} 个文件`);
    },
    upLoadAvatarImage(param){  //自定义上传动作
      let formData = new FormData();
      formData.append("file", param.file);
      upload_image(formData).then(res=>{
        console.log("upLoadAvatarImage res:", res)
        this.form.file = res.data.file
        this.form.file.status = 'success'
        this.form.file.uid = new Date().getTime()
        // 上传成功提示
        this.$message({
          center: true,
          message: '图片上传成功',
          type: 'success',
        })
      })
    },
    handelAvatarRemove(file, fileList){ //删除列表里的图片
      this.form.file = {url: null, name: null}
    },
    beforeAvatarUpload(file) {  // 上传的验证
      const isIMAGE = (file.type === 'image/jpeg' || file.type === 'image/png');
      const isLt1M = file.size / 1024 / 1024 < 1;

      if (!isIMAGE) {
        this.$message.error({showClose: true, message: '只能上传jpg/png图片!'});
        return false;
      }
      if (!isLt1M) {
        this.$message.error({showClose: true, message: '上传文件大小不能超过 1MB!'});
        return false;
      }
    },
    upLoadAvatarSuccess(res, file){
      this.form.file = res.data.file
      this.$message({
          center: true,
          message: '图片['+res.data.file.name+']上传成功',
          type: 'success',
        })
    },
    // --结束---

    // ---多张图片开始--- 
    upLoadImage(param){ //上传前回调
      let formData = new FormData();
      formData.append("file", param.file);
      upload_image(formData).then(res=>{
        var index = this.form.files.filter(item=>item.name===res.data.file.name)
        var i = this.form.files.indexOf(index)
        var ele = res.data.file
        ele.uid = new Date().getTime()
        ele.status = 'success'
        this.form.files.splice(i, 1, ele)
      })
    },
    onRemoveImg(file, fileList){
      this.form.files = fileList
    },
    //files是本次选择的文件
    //fileList是当前uploader对象中待上传的文件列表
    handleExceed(files, fileList) {
      this.$message.warning(`当前限制选择 3 个文件，本次选择了 ${files.length} 个文件，共选择了 ${files.length + fileList.length} 个文件`);
    },
    upLoadSuccess(res, file){
      file.url = res.data.file.url
      this.$message({
          center: true,
          message: '图片['+res.data.file.name+']上传成功',
          type: 'success',
        })
    },
    uploadError(err, file, fileList){
      console.log("err:", err)
    }
  },
};
</script>

<style scoped>
.handle-box {
  margin-bottom: 20px;
}

.handle-select {
  width: 120px;
}

.handle-input {
  width: 300px;
  display: inline-block;
}
.table {
  width: 100%;
  font-size: 14px;
}
.red {
  color: #ff0000;
}
.mr10 {
  margin-right: 10px;
}
.table-td-thumb {
  display: block;
  margin: auto;
  width: 40px;
  height: 40px;
}
.table-td-mid {
  margin: auto;
  width: 320px;
  height: auto;
}
</style>

 

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