element-ui上传图片组件封装

//上传图片组件 定义文件imageUpload
<template>
  <div class="component-upload-image">
    <el-upload multiple :action="uploadImgUrl" list-type="picture-card" :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed"
      ref="imageUpload" :on-remove="handleDelete" :show-file-list="true" :headers="headers" :file-list="fileList"
      :on-preview="handlePictureCardPreview" :class="{ hide: this.fileList.length >= this.limit }">
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传
      <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{
   {
    fileSize }}MB</b> </template>
      <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{
   {
    fileType.join("/") }}</b> </template>
      的文件
    </div>

    <el-dialog :visible.sync="dialogVisible" title="预览" width="800" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script>
import {
    getToken } from "@/utils/auth";
//接口api
import {
    serviceApi} from "@/utils/serviceApi";
export default {
   
  props: {
   
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
   
      type: Number,
      default: 6,
    },
    // 大小限制(MB)
    fileSize: {
   
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
   
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
   
      type: Boolean,
      default: true
    }
  },
  data () {
   
    return {
   
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: serviceApi(),
      uploadImgUrl: serviceApi() + "/PicturesUpload", // 上传的图片服务器地址
      headers: {
   
        Authorization: "Bearer " + getToken(),
      },
      fileList: []
    };
  },
  watch: {
   
    value: {
   
      handler (val) {
   
        if (val) {
   
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',');
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
   

            if (typeof item === "string") {
   
              if (item.indexOf(this.baseUrl) === -1) {
   
                item = {
    name: this.baseUrl + item, url: this.baseUrl + item };
              } else {
   
                item = {
    name: item, url: item };
              }
            }
            return item;
          });
        } else {
   
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true
    }
  },
  computed: {
   
    // 是否显示提示
    showTip () {
   
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
   
    // 上传前loading加载
    handleBeforeUpload (file) {
   
      let isImg = false;
      if (this.fileType.length) {
   
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
   
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some(type => {
   
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
   
        isImg = file.type.indexOf("image") > -1;
      }

      if (!isImg) {
   
        this.$modal.msgError(`文件格式不正确, 请上传${
     this.fileType.join("/")}图片格式文件!`);
        return false;
      }
      if (this.fileSize) {
   
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
   
          this.$modal.msgError(`上传头像图片大小不能超过 ${
     this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传图片,请稍候...");
      this.number++;
    },
    // 文件个数超出
    handleExceed () {
   
      this.$modal.msgError(`上传文件数量不能超过 ${
     this.limit} 个!`);
    },
    // 上传成功回调
    handleUploadSuccess (res, file) {
   
      console.log(res, 'res');
      if (res.code === 200) {
   
        this.uploadList.push({
    name: res.fileName, url: res.imgUrl });
        this.uploadedSuccessfully();
      } else {
   
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.imageUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    // 删除图片
    handleDelete (file) {
   
      const findex = this.fileList.map(f => f.name).indexOf(file.name);
      if (findex > -1) {
   
        this.fileList.splice(findex, 1);
        this.$emit("input", this.listToString(this.fileList));
      }
    },
    // 上传失败
    handleUploadError () {
   
      this.$modal.msgError("上传图片失败,请重试");
      this.$modal.closeLoading();
    },
    // 上传结束处理
    uploadedSuccessfully () {
   
      if (this.number > 0 && this.uploadList.length === this.number) {
   
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        this.$emit("input", this.listToString(this.fileList));
        this.$modal.closeLoading();
      }
    },
    // 预览
    handlePictureCardPreview (file) {
   
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString (list, separator) {
   
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
   
        if (list[i].url) {
   
          strs += list[i].url.replace(this.baseUrl, "") + separator;
        }
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : '';
    }
  }
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
   
  display: none;
}

// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
   
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
   
  opacity: 0;
  transform: translateY(0);
}
</style>


//详情展示图片组件 定义文件 ImagePreview
<template>
  <div>
    <el-image v-for="(item, index) in realSrc" :key="index" :src="`${baseUrl}` + item" fit="cover"
      :style="`width:${realWidth};height:${realHeight};`" :preview-src-list="realSrcList">
      <div slot="error" class="image-slot">
        <i class="el-icon-picture-outline"></i>
      </div>
    </el-image>
  </div>
</template>

<script>
import {
    isExternal } from "@/utils/validate";
import {
    serviceApi} from "@/utils/serviceApi";
export default {
   
  name: "ImagePreview",
  data () {
   
    return {
   
      baseUrl: serviceApi(),
    }
  },
  props: {
   
    src: {
   
      type: String,
      default: ""
    },
    width: {
   
      type: [Number, String],
      default: ""
    },
    height: {
   
      type: [Number, String],
      default: ""
    }
  },
  computed: {
   
    realSrc () {
   
      if (!this.src) {
   
        return;
      }
      let real_src = this.src.split(",");
      if (isExternal(real_src)) {
   
        return real_src;
      }
      return real_src;
    },
    realSrcList () {
   
      if (!this.src) {
   
        return;
      }
      let real_src_list = this.src.split(",");
      let srcList = [];
      real_src_list.forEach(item => {
   
        if (isExternal(item)) {
   
          return srcList.push(item);
        }
        return srcList.push(this.baseUrl + item);
      });
      return srcList;
    },
    realWidth () {
   
      return typeof this.width == "string" ? this.width : `${
     this.width}px`;
    },
    realHeight () {
   
      return typeof this.height == "string" ? this.height : `${
     this.height}px`;
    }
  },
};
</script>

<style lang="scss" scoped>
.el-image {
   
  border-radius: 5px;
  background-color: #ebeef5;
  box-shadow: 0 0 5px 1px #ccc;
  margin-left: 15px;
  margin-top: 6px;

  ::v-deep .el-image__inner {
   
    transition: all 0.3s;
    cursor: pointer;

    &:hover {
   
      transform: scale(1.2);
    }
  }

  ::v-deep .image-slot {
   
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    color: #909399;
    font-size: 30px;
  }
}
</style>

//页面调用
<template>
<div class="file-mar">附件:</div>
//上传图片组件
 <imageUpload v-model="value" />
 //详情展示图片组件
 <imagePreview :src="detailImg" :width="120" :height="120" v-if="actionType == 'detail' || actionType == 'check'"></imagePreview>
</template>
//上传图片组件
import ImageUpload from "@/components/ImageUpload";
详情图片展示组件
import ImagePreview from "@/components/ImagePreview";
//组件注册
components: {
   
    ImageUpload,
    ImagePreview
},
  
//定义接受字段
 value: '', //上传图片会以逗号拼接上传后台
 detailImg:'' //详情展示图片

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