digital-medicine-front/src/components/ImageUpload/index.vue

<template>
    <div class="component-upload-image">
        <el-upload ref="imageUpload" multiple :action="uploadImgUrl" list-type="picture-card" :on-success="handleUploadSuccess" :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed" :before-remove="handleDelete" :show-file-list="true" :headers="headers" :file-list="fileList" :on-preview="handlePictureCardPreview" :class="{ hide: fileList.length >= limit }">
            <el-icon class="avatar-uploader-icon">
                <plus />
            </el-icon>
        </el-upload>
        <!-- 上传提示 -->
        <div v-if="showTip" class="el-upload__tip">
            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 v-model="dialogVisible" title="预览" width="800px" append-to-body>
            <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
        </el-dialog>
    </div>
</template>

<script setup lang="ts">
import { listByIds, delOss } from '@/api/system/oss';
import { OssVO } from '@/api/system/oss/types';
import { propTypes } from '@/utils/propTypes';
import { globalHeaders } from '@/utils/request';
import { compressAccurately } from 'image-conversion';

const props = defineProps({
  modelValue: {
    type: [String, Object, Array],
    default: () => []
  },
  isString: propTypes.bool.def(false),

  // 图片数量限制
  limit: propTypes.number.def(5),
  // 大小限制(MB)
  fileSize: propTypes.number.def(5),
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: propTypes.array.def(['png', 'jpg', 'jpeg']),
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true
  },
  // 是否支持压缩，默认否
  compressSupport: {
    type: Boolean,
    default: false
  },
  // 压缩目标大小，单位KB。默认300KB以上文件才压缩，并压缩至300KB以内
  compressTargetSize: propTypes.number.def(300)
});

const { proxy } = getCurrentInstance() as ComponentInternalInstance;
const emit = defineEmits(['update:modelValue']);
const number = ref(0);
const uploadList = ref<any[]>([]);
const dialogImageUrl = ref('');
const dialogVisible = ref(false);

const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(baseUrl + '/resource/oss/upload'); // 上传的图片服务器地址
const headers = ref(globalHeaders());

const fileList = ref<any[]>([]);
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize));

const imageUploadRef = ref<ElUploadInstance>();

watch(
  () => props.modelValue,
  async (val: string) => {
    if (val) {
      // 首先将值转为数组
      let list: any[] = [];
      if (Array.isArray(val)) {
        if (props.isString) {
          list = val.map((item) => {
            return {
              url: item
            };
          });
        } else {
          list = val as OssVO[];
        }
      } else if (val.startsWith('http')) {
        if (val.split(',').length > 0){
          val.split(',').forEach((item) => {
          list.push({ url: item });
        });
        }else {
          list = [{
            url: val
          }];
        }
      } else {
        const res = await listByIds(val);
        list = res.data;
      }
      // 然后将数组转为对象数组
      fileList.value = list.map((item) => {
        // 字符串回显处理 如果此处存的是url可直接回显 如果存的是id需要调用接口查出来
        let itemData;
        if (typeof item === 'string') {
          itemData = { name: item, url: item };
        } else {
          // 此处name使用ossId 防止删除出现重名
          itemData = { name: item.ossId, url: item.url, ossId: item.ossId };
        }
        return itemData;
      });
    } else {
      fileList.value = [];
      return [];
    }
  },
  { deep: true, immediate: true }
);

/** 上传前loading加载 */
const handleBeforeUpload = (file: any) => {
  let isImg = false;
  if (props.fileType.length) {
    let fileExtension = '';
    if (file.name.lastIndexOf('.') > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1);
    }
    isImg = props.fileType.some((type: any) => {
      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) {
    proxy?.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join('/')}图片格式文件!`);
    return false;
  }
  if (file.name.includes(',')) {
    proxy?.$modal.msgError('文件名不正确，不能包含英文逗号!');
    return false;
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy?.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }

  //压缩图片，开启压缩并且大于指定的压缩大小时才压缩
  if (props.compressSupport && file.size / 1024 > props.compressTargetSize) {
    proxy?.$modal.loading('正在上传图片，请稍候...');
    number.value++;
    return compressAccurately(file, props.compressTargetSize);
  } else {
    proxy?.$modal.loading('正在上传图片，请稍候...');
    number.value++;
  }
};

// 文件个数超出
const handleExceed = () => {
  proxy?.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
};

// 上传成功回调
const handleUploadSuccess = (res: any, file: UploadFile) => {
  if (res.code === 200) {
    if (props.isString) {
      uploadList.value.push(res.data.url);
    } else {
      uploadList.value.push({ name: res.data.fileName, url: res.data.url, ossId: res.data.ossId });
    }
    uploadedSuccessfully();
  } else {
    number.value--;
    proxy?.$modal.closeLoading();
    proxy?.$modal.msgError(res.msg);
    imageUploadRef.value?.handleRemove(file);
    uploadedSuccessfully();
  }
};

// 删除图片
const handleDelete = (file: UploadFile): boolean => {

  if (props.isString) {
    var findex = fileList.value.map((f) => f.url).indexOf(file.url);
  }else {
    var findex = fileList.value.map((f) => f.name).indexOf(file.name);
  }
  if (findex > -1 && uploadList.value.length === number.value) {
    let ossId = fileList.value[findex].ossId;
    if (!props.isString) {
      delOss(ossId);
    }
    fileList.value.splice(findex, 1);
    emit('update:modelValue', listToString(fileList.value));
    return false;
  }
  return true;
};

// 上传结束处理
const uploadedSuccessfully = () => {
  if (number.value > 0 && uploadList.value.length === number.value) {
    if (props.isString) {
      uploadList.value.forEach((item) => {
        fileList.value.push({ url: item });
      });
    } else {
      fileList.value = fileList.value.filter((f) => f.url !== undefined).concat(uploadList.value);
    }
    uploadList.value = [];
    number.value = 0;
    emit('update:modelValue', listToString(fileList.value));
    proxy?.$modal.closeLoading();
  }
};

// 上传失败
const handleUploadError = () => {
  proxy?.$modal.msgError('上传图片失败');
  proxy?.$modal.closeLoading();
};

// 预览
const handlePictureCardPreview = (file: any) => {
  dialogImageUrl.value = file.url;
  dialogVisible.value = true;
};

// 对象转成指定字符串分隔
const listToString = (list: any[], separator?: string) => {
  let strs = '';
  separator = separator || ',';
  for (let i in list) {
    if (props.isString) {
      strs += list[i].url + separator;
    } else if (undefined !== list[i].ossId && list[i].url.indexOf('blob:') !== 0) {
      strs += list[i].ossId + separator;
    }
  }
  return strs != '' ? strs.substring(0, strs.length - 1) : '';
};
</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
  display: none;
}
</style>