我正在使用import * as Dropzone from 'react-dropzone';via npm install react-dropzone --save-dev。去这里了解详情。
默认情况下,此 dropzone 包允许您单击 UI 的 dropzone 以打开文件对话框,供用户选择要上传的文件。
这是我使用的代码,其中包括“选择文件”按钮和“删除”按钮。*注意:multiple={false}禁用用户选择多个文件的能力。您只需将其更改为 true 即可启用多文件选择。
import * as React from 'react';
import * as Dropzone from 'react-dropzone';
export interface FileUploadState { file: Array<File> }
export class FileUpload extends React.Component<{}, FileUploadState> {
constructor(props: any) {
super(props);
this.state = {
file: []
}
}
onDrop(droppedFile: any) {
if (droppedFile && droppedFile.preview) {
window.URL.revokeObjectURL(droppedFile.preview);
}
this.setState({
file: droppedFile
});
console.log(droppedFile);
}
onDelete() {
this.setState({
file: []
});
}
render() {
let dropzoneRef: any;
return (
<div>
<div>
<Dropzone ref={(node) => { dropzoneRef = node; }} onDrop={this.onDrop.bind(this)} multiple={false}>
<div className="text-center">Drag and drop your file here, or click here to select file to upload.</div>
</Dropzone>
<button type="button" className="button primary" onClick={(e) => {
e.preventDefault(); // --> without this onClick fires 3 times
dropzoneRef.open();
}}>
Choose File(s)
</button>
<button type="button" className="button alert" onClick={this.onDelete.bind(this)}>
Delete
</button>
</div>
<hr />
<div>
<h2>File(s) to be uploaded: {this.state.file.length} </h2>
<ul>
{
this.state.file.map(f => <li><code>{f.name}</code></li>)
}
</ul>
</div>
</div>
)
}
}