392 lines
12 KiB
Markdown
392 lines
12 KiB
Markdown
## Upload 上传
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通过点击或者拖拽上传文件
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### 点击上传
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:::demo 通过 slot 你可以传入自定义的上传按钮类型和文字提示。可通过设置`limit`和`on-exceed`来限制上传文件的个数和定义超出限制时的行为。可通过设置`before-remove`来阻止文件移除操作。
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```html
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<el-upload
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class="upload-demo"
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action="https://jsonplaceholder.typicode.com/posts/"
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:on-preview="handlePreview"
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:on-remove="handleRemove"
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:before-remove="beforeRemove"
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multiple
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:limit="3"
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:on-exceed="handleExceed"
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:file-list="fileList">
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<el-button size="small" type="primary">点击上传</el-button>
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<div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
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</el-upload>
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<script>
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export default {
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data() {
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return {
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fileList: [{name: 'food.jpeg', url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100'}, {name: 'food2.jpeg', url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100'}]
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};
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},
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methods: {
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handleRemove(file, fileList) {
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console.log(file, fileList);
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},
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handlePreview(file) {
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console.log(file);
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},
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handleExceed(files, fileList) {
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this.$message.warning(`当前限制选择 3 个文件，本次选择了 ${files.length} 个文件，共选择了 ${files.length + fileList.length} 个文件`);
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},
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beforeRemove(file, fileList) {
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return this.$confirm(`确定移除 ${ file.name }？`);
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}
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}
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}
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</script>
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```
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:::
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### 用户头像上传
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使用 `before-upload` 限制用户上传的图片格式和大小。
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:::demo
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```html
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<el-upload
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class="avatar-uploader"
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action="https://jsonplaceholder.typicode.com/posts/"
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:show-file-list="false"
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:on-success="handleAvatarSuccess"
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:before-upload="beforeAvatarUpload">
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<img v-if="imageUrl" :src="imageUrl" class="avatar">
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<i v-else class="el-icon-plus avatar-uploader-icon"></i>
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</el-upload>
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<style>
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.avatar-uploader .el-upload {
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border: 1px dashed #d9d9d9;
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border-radius: 6px;
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cursor: pointer;
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position: relative;
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overflow: hidden;
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}
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.avatar-uploader .el-upload:hover {
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border-color: #409EFF;
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}
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.avatar-uploader-icon {
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font-size: 28px;
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color: #8c939d;
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width: 178px;
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height: 178px;
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line-height: 178px;
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text-align: center;
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}
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.avatar {
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width: 178px;
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height: 178px;
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display: block;
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}
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</style>
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<script>
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export default {
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data() {
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return {
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imageUrl: ''
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};
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},
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methods: {
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handleAvatarSuccess(res, file) {
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this.imageUrl = URL.createObjectURL(file.raw);
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},
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beforeAvatarUpload(file) {
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const isJPG = file.type === 'image/jpeg';
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const isLt2M = file.size / 1024 / 1024 < 2;
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if (!isJPG) {
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this.$message.error('上传头像图片只能是 JPG 格式!');
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}
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if (!isLt2M) {
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this.$message.error('上传头像图片大小不能超过 2MB!');
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}
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return isJPG && isLt2M;
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}
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}
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}
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</script>
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```
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:::
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### 照片墙
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使用 `list-type` 属性来设置文件列表的样式。
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:::demo
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```html
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<el-upload
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action="https://jsonplaceholder.typicode.com/posts/"
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list-type="picture-card"
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:on-preview="handlePictureCardPreview"
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:on-remove="handleRemove">
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<i class="el-icon-plus"></i>
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</el-upload>
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<el-dialog :visible.sync="dialogVisible">
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<img width="100%" :src="dialogImageUrl" alt="">
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</el-dialog>
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<script>
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export default {
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data() {
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return {
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dialogImageUrl: '',
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dialogVisible: false
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};
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},
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methods: {
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handleRemove(file, fileList) {
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console.log(file, fileList);
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},
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handlePictureCardPreview(file) {
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this.dialogImageUrl = file.url;
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this.dialogVisible = true;
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}
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}
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}
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</script>
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```
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:::
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### 文件缩略图
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使用 `scoped-slot` 去设置缩略图模版。
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:::demo
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```html
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<el-upload
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action="#"
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list-type="picture-card"
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:auto-upload="false">
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<i slot="default" class="el-icon-plus"></i>
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<div slot="file" slot-scope="{file}">
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<img
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class="el-upload-list__item-thumbnail"
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:src="file.url" alt=""
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>
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<span class="el-upload-list__item-actions">
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<span
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class="el-upload-list__item-preview"
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@click="handlePictureCardPreview(file)"
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>
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<i class="el-icon-zoom-in"></i>
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</span>
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<span
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v-if="!disabled"
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class="el-upload-list__item-delete"
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@click="handleDownload(file)"
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>
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<i class="el-icon-download"></i>
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</span>
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<span
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v-if="!disabled"
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class="el-upload-list__item-delete"
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@click="handleRemove(file)"
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>
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<i class="el-icon-delete"></i>
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</span>
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</span>
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</div>
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</el-upload>
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<el-dialog :visible.sync="dialogVisible">
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<img width="100%" :src="dialogImageUrl" alt="">
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</el-dialog>
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<script>
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export default {
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data() {
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return {
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dialogImageUrl: '',
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dialogVisible: false,
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disabled: false
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};
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},
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methods: {
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handleRemove(file) {
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console.log(file);
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},
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handlePictureCardPreview(file) {
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this.dialogImageUrl = file.url;
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this.dialogVisible = true;
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},
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handleDownload(file) {
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console.log(file);
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}
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}
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}
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</script>
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```
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:::
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### 图片列表缩略图
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:::demo
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```html
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<el-upload
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class="upload-demo"
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action="https://jsonplaceholder.typicode.com/posts/"
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:on-preview="handlePreview"
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:on-remove="handleRemove"
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:file-list="fileList"
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list-type="picture">
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<el-button size="small" type="primary">点击上传</el-button>
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<div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
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</el-upload>
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<script>
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export default {
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data() {
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return {
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fileList: [{name: 'food.jpeg', url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100'}, {name: 'food2.jpeg', url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100'}]
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};
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},
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methods: {
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handleRemove(file, fileList) {
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console.log(file, fileList);
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},
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handlePreview(file) {
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console.log(file);
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}
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}
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}
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</script>
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```
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:::
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### 上传文件列表控制
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通过 `on-change` 钩子函数来对列表进行控制
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:::demo
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```html
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<el-upload
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class="upload-demo"
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action="https://jsonplaceholder.typicode.com/posts/"
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:on-change="handleChange"
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:file-list="fileList">
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<el-button size="small" type="primary">点击上传</el-button>
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<div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
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</el-upload>
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<script>
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export default {
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data() {
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return {
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fileList: [{
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name: 'food.jpeg',
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url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100'
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}, {
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name: 'food2.jpeg',
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url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100'
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}]
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};
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},
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methods: {
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handleChange(file, fileList) {
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this.fileList = fileList.slice(-3);
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}
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}
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}
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</script>
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```
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:::
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### 拖拽上传
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:::demo
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```html
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<el-upload
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class="upload-demo"
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drag
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action="https://jsonplaceholder.typicode.com/posts/"
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multiple>
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<i class="el-icon-upload"></i>
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<div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
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<div class="el-upload__tip" slot="tip">只能上传jpg/png文件，且不超过500kb</div>
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</el-upload>
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```
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:::
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### 手动上传
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:::demo
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```html
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<el-upload
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class="upload-demo"
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ref="upload"
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action="https://jsonplaceholder.typicode.com/posts/"
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:on-preview="handlePreview"
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:on-remove="handleRemove"
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:file-list="fileList"
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:auto-upload="false">
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<el-button slot="trigger" size="small" type="primary">选取文件</el-button>
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<el-button style="margin-left: 10px;" size="small" type="success" @click="submitUpload">上传到服务器</el-button>
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<div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
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</el-upload>
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<script>
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export default {
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data() {
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return {
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fileList: [{name: 'food.jpeg', url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100'}, {name: 'food2.jpeg', url: 'https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100'}]
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};
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},
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methods: {
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submitUpload() {
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this.$refs.upload.submit();
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},
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handleRemove(file, fileList) {
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console.log(file, fileList);
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},
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handlePreview(file) {
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console.log(file);
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}
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}
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}
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</script>
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```
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:::
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### Attribute
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| 参数 | 说明 | 类型 | 可选值 | 默认值 |
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|---------- |-------------- |---------- |-------------------------------- |-------- |
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| action | 必选参数，上传的地址 | string | — | — |
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| headers | 设置上传的请求头部 | object | — | — |
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| multiple | 是否支持多选文件 | boolean | — | — |
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| data | 上传时附带的额外参数 | object | — | — |
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| name | 上传的文件字段名 | string | — | file |
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| with-credentials | 支持发送 cookie 凭证信息 | boolean | — | false |
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| show-file-list | 是否显示已上传文件列表 | boolean | — | true |
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| drag | 是否启用拖拽上传 | boolean | — | false |
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| accept | 接受上传的[文件类型](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#attr-accept)（thumbnail-mode 模式下此参数无效）| string | — | — |
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| on-preview | 点击文件列表中已上传的文件时的钩子 | function(file) | — | — |
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| on-remove | 文件列表移除文件时的钩子 | function(file, fileList) | — | — |
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| on-success | 文件上传成功时的钩子 | function(response, file, fileList) | — | — |
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| on-error | 文件上传失败时的钩子 | function(err, file, fileList) | — | — |
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| on-progress | 文件上传时的钩子 | function(event, file, fileList) | — | — |
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| on-change | 文件状态改变时的钩子，添加文件、上传成功和上传失败时都会被调用 | function(file, fileList) | — | — |
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| before-upload | 上传文件之前的钩子，参数为上传的文件，若返回 false 或者返回 Promise 且被 reject，则停止上传。 | function(file) | — | — |
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| before-remove | 删除文件之前的钩子，参数为上传的文件和文件列表，若返回 false 或者返回 Promise 且被 reject，则停止删除。| function(file, fileList) | — | — |
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| list-type | 文件列表的类型 | string | text/picture/picture-card | text |
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| auto-upload | 是否在选取文件后立即进行上传 | boolean | — | true |
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| file-list | 上传的文件列表, 例如: [{name: 'food.jpg', url: 'https://xxx.cdn.com/xxx.jpg'}] | array | — | [] |
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| http-request | 覆盖默认的上传行为，可以自定义上传的实现 | function | — | — |
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| disabled | 是否禁用 | boolean | — | false |
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| limit | 最大允许上传个数 | number | — | — |
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| on-exceed | 文件超出个数限制时的钩子 | function(files, fileList) | — | - |
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### Slot
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| name | 说明 |
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|------|--------|
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| trigger | 触发文件选择框的内容 |
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| tip | 提示说明文字 |
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### Methods
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| 方法名 | 说明 | 参数 |
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|----------- |-------------- | -- |
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| clearFiles | 清空已上传的文件列表（该方法不支持在 before-upload 中调用） | — |
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| abort | 取消上传请求 | （ file: fileList 中的 file 对象 ） |
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| submit | 手动上传文件列表 | — |
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