lx-admin-frontend/src/components/FileUpload/index.vue

<script setup lang="ts">
import { getToken } from "@/utils/auth";
import { listByIds, delOss } from "@/api/system/oss";
import { ComponentInternalInstance } from "vue";
import { ElUpload, UploadFile } from "element-plus";

const props = defineProps({
  modelValue: [String, Object, Array],
  // 数量限制
  limit: {
    type: Number,
    default: 5,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 5,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ["doc", "xls", "ppt", "txt", "pdf"],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true
  }
});

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

const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadFileUrl = ref(baseUrl + "/system/oss/upload"); // 上传文件服务器地址
const headers = ref({ Authorization: "Bearer " + getToken() });

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

const fileUploadRef = ref(ElUpload);

watch(() => props.modelValue, async val => {
  if (val) {
    let temp = 1;
    // 首先将值转为数组
    let list = [];
    if (Array.isArray(val)) {
      list = val;
    } else {
      const res =  await listByIds(val as string)
      list = res.data.map((oss) => {
          const data = { name: oss.originalName, url: oss.url, ossId: oss.ossId };
          return data;
        });
    }
    // 然后将数组转为对象数组
    fileList.value = list.map(item => {
      item = {name: item.name, url: item.url, ossId: item.ossId};
      item.uid = item.uid || new Date().getTime() + temp++;
      return item;
    });
  } else {
    fileList.value = [];
    return [];
  }
},{ deep: true, immediate: true });

// 上传前校检格式和大小
const handleBeforeUpload = (file: any) => {
  // 校检文件类型
  if (props.fileType.length) {
    const fileName = file.name.split('.');
    const fileExt = fileName[fileName.length - 1];
    const isTypeOk = props.fileType.indexOf(fileExt) >= 0;
    if (!isTypeOk) {
      proxy?.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join("/")}格式文件!`);
      return false;
    }
  }
  // 校检文件大小
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy?.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  proxy?.$modal.loading("正在上传文件，请稍候...");
  number.value++;
  return true;
}

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

// 上传失败
const handleUploadError = () => {
  proxy?.$modal.msgError("上传文件失败");
}

// 上传成功回调
const handleUploadSuccess = (res:any, file: UploadFile) => {
  if (res.code === 200) {
    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);
    fileUploadRef.value.handleRemove(file);
    uploadedSuccessfully();
  }
}

// 删除文件
const handleDelete = (index: number) => {
  let ossId = fileList.value[index].ossId;
  delOss(ossId);
  fileList.value.splice(index, 1);
  emit("update:modelValue", listToString(fileList.value));
}

// 上传结束处理
const uploadedSuccessfully =() => {
  if (number.value > 0 && uploadList.value.length === number.value) {
    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();
  }
}

// 获取文件名称
const getFileName = (name: string) => {
  // 如果是url那么取最后的名字 如果不是直接返回
  if (name.lastIndexOf("/") > -1) {
    return name.slice(name.lastIndexOf("/") + 1);
  } else {
    return name;
  }
}

// 对象转成指定字符串分隔
const listToString = (list: any[], separator?: string) => {
  let strs = "";
  separator = separator || ",";
  list.forEach(item => {
    if (item.ossId) {
      strs += item.ossId + separator;
    }
  })
  return strs != "" ? strs.substring(0, strs.length - 1) : "";
}
</script>

<template>
	<div class="upload-file">
		<el-upload
			multiple
			:action="uploadFileUrl"
			:before-upload="handleBeforeUpload"
			:file-list="fileList"
			:limit="limit"
			:on-error="handleUploadError"
			:on-exceed="handleExceed"
			:on-success="handleUploadSuccess"
			:show-file-list="false"
			:headers="headers"
			class="upload-file-uploader"
			ref="fileUploadRef"
		>
			<!-- 上传按钮 -->
			<el-button type="primary">选取文件</el-button>
		</el-upload>
		<!-- 上传提示 -->
		<div class="el-upload__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>
		<!-- 文件列表 -->
		<transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
			<li :key="file.uid" class="el-upload-list__item ele-upload-list__item-content" v-for="(file, index) in fileList">
				<el-link :href="`${file.url}`" :underline="false" target="_blank">
					<span class="el-icon-document"> {{ getFileName(file.name) }} </span>
				</el-link>
				<div class="ele-upload-list__item-content-action">
					<el-link :underline="false" @click="handleDelete(index)" type="danger">删除</el-link>
				</div>
			</li>
		</transition-group>
	</div>
</template>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>