71 lines
1.7 KiB
Vue
71 lines
1.7 KiB
Vue
<docs>
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---
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order: 10
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title:
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zh-CN: 上传前转换文件
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en-US: Transform file before request
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---
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## zh-CN
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使用 `beforeUpload` 转换上传的文件（例如添加水印）。
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## en-US
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Use `beforeUpload` for transform file before request such as add a watermark.
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</docs>
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<template>
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<div>
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<a-upload
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v-model:file-list="fileList"
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action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
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:before-upload="beforeUpload"
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>
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<a-button>
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<upload-outlined></upload-outlined>
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Upload
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</a-button>
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</a-upload>
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</div>
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</template>
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<script lang="ts">
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import { UploadOutlined } from '@ant-design/icons-vue';
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import { defineComponent, ref } from 'vue';
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import type { UploadProps } from 'ant-design-vue';
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export default defineComponent({
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components: {
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UploadOutlined,
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},
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setup() {
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const beforeUpload: UploadProps['beforeUpload'] = file => {
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return new Promise(resolve => {
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const reader = new FileReader();
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reader.readAsDataURL(file);
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reader.onload = () => {
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const img: HTMLImageElement = document.createElement('img');
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img.src = reader.result as string;
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img.onload = () => {
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const canvas = document.createElement('canvas');
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canvas.width = img.naturalWidth;
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canvas.height = img.naturalHeight;
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const ctx = canvas.getContext('2d');
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ctx.drawImage(img, 0, 0);
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ctx.fillStyle = 'red';
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ctx.textBaseline = 'middle';
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ctx.font = '33px Arial';
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ctx.fillText('Ant Design Vue', 20, 20);
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canvas.toBlob(resolve);
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};
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};
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});
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};
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return {
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beforeUpload,
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fileList: ref([]),
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};
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},
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});
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</script>
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