ant-design-vue/components/upload/demo/avatar.vue

<docs>
---
order: 1
title:
  zh-CN: 用户头像
  en-US: Avatar
---

## zh-CN

点击上传用户头像，并使用 `beforeUpload` 限制用户上传的图片格式和大小。

> `beforeUpload` 的返回值可以是一个 Promise 以支持异步处理，如服务端校验等：可参考react版本[示例](http://react-component.github.io/upload/examples/beforeUpload.html)。

## en-US

Click to upload user's avatar, and validate size and format of picture with `beforeUpload`.

> The return value of function `beforeUpload` can be a Promise to check asynchronously. [demo](http://react-component.github.io/upload/examples/beforeUpload.html)
</docs>

<template>
  <a-upload
    v-model:file-list="fileList"
    name="avatar"
    list-type="picture-card"
    class="avatar-uploader"
    :show-upload-list="false"
    action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
    :before-upload="beforeUpload"
    @change="handleChange"
  >
    <img v-if="imageUrl" :src="imageUrl" alt="avatar" />
    <div v-else>
      <loading-outlined v-if="loading"></loading-outlined>
      <plus-outlined v-else></plus-outlined>
      <div class="ant-upload-text">Upload</div>
    </div>
  </a-upload>
</template>
<script lang="ts" setup>
import { ref } from 'vue';
import { PlusOutlined, LoadingOutlined } from '@ant-design/icons-vue';
import { message } from 'ant-design-vue';
import type { UploadChangeParam, UploadProps } from 'ant-design-vue';

function getBase64(img: Blob, callback: (base64Url: string) => void) {
  const reader = new FileReader();
  reader.addEventListener('load', () => callback(reader.result as string));
  reader.readAsDataURL(img);
}

const fileList = ref([]);
const loading = ref<boolean>(false);
const imageUrl = ref<string>('');

const handleChange = (info: UploadChangeParam) => {
  if (info.file.status === 'uploading') {
    loading.value = true;
    return;
  }
  if (info.file.status === 'done') {
    // Get this url from response in real world.
    getBase64(info.file.originFileObj, (base64Url: string) => {
      imageUrl.value = base64Url;
      loading.value = false;
    });
  }
  if (info.file.status === 'error') {
    loading.value = false;
    message.error('upload error');
  }
};

const beforeUpload = (file: UploadProps['fileList'][number]) => {
  const isJpgOrPng = file.type === 'image/jpeg' || file.type === 'image/png';
  if (!isJpgOrPng) {
    message.error('You can only upload JPG file!');
  }
  const isLt2M = file.size / 1024 / 1024 < 2;
  if (!isLt2M) {
    message.error('Image must smaller than 2MB!');
  }
  return isJpgOrPng && isLt2M;
};
</script>
<style scoped>
.avatar-uploader > .ant-upload {
  width: 128px;
  height: 128px;
}
.ant-upload-select-picture-card i {
  font-size: 32px;
  color: #999;
}

.ant-upload-select-picture-card .ant-upload-text {
  margin-top: 8px;
  color: #666;
}
</style>