希望你能帮助我,我正在使用 react-dropzone 中的 useDropzone 钩子,我不知道如何为每个文件创建一个删除文件按钮。
如何删除单个文件?
这是我的代码:
function DragFile(props) {
const { acceptedFiles, rejectedFiles, getRootProps, getInputProps } = useDropzone({
accept: 'image/jpeg, image/png, .pdf',
maxSize: 3000000,
multiple: true
});
const acceptedFilesItems = acceptedFiles.map(file => (
<Col xs={12} md={4} key={file.path} className="card-file">
<div className="file-extension">{file.path.substring(file.path.indexOf('.') + 1)}</div>
<span>{file.path.substring(0, file.path.indexOf('.'))} <small>{(file.size / 1000).toFixed(2)} Kb</small></span>
<button className="delete">DeleteButton</button>
</Col>
));
const rejectedFilesItems = rejectedFiles.map(file => (
<li key={file.path}>
{file.path.substring(0, file.path.indexOf('.'))} - {file.size / 1000} Kb
</li>
));
return (
<div>
<div {...getRootProps({ className: 'dropzone drag-n-drop' })}>
<input id="file-claim" {...getInputProps()} />
<img src={uploadSrc} alt="Subir archivo" />
<p>Drag files here (PDF, JPG, PNG).</p>
</div>
<Row className="accepted-files">
{acceptedFilesItems}
</Row>
</div>
);
}
export default DragFile;
让我添加这段代码,因为这里的其他答案我不清楚:
您需要创建自己的 myFiles 状态并使用 onDrop 函数更新它,然后使用删除函数从本地状态中删除该文件。
import React, { useState, useCallback } from "react"
import { useDropzone } from "react-dropzone"
function Basic(props) {
const [myFiles, setMyFiles] = useState([])
const onDrop = useCallback(acceptedFiles => {
setMyFiles([...myFiles, ...acceptedFiles])
}, [myFiles])
const { getRootProps, getInputProps } = useDropzone({
onDrop,
})
const removeFile = file => () => {
const newFiles = [...myFiles]
newFiles.splice(newFiles.indexOf(file), 1)
setMyFiles(newFiles)
}
const removeAll = () => {
setMyFiles([])
}
const files = myFiles.map(file => (
<li key={file.path}>
{file.path} - {file.size} bytes{" "}
<button onClick={removeFile(file)}>Remove File</button>
</li>
))
return (
<section className="container">
<div {...getRootProps({ className: "dropzone" })}>
<input {...getInputProps()} />
<p>Drag 'n' drop some files here, or click to select files</p>
</div>
<aside>
<h4>Files</h4>
<ul>{files}</ul>
</aside>
{files.length > 0 && <button onClick={removeAll}>Remove All</button>}
</section>
)
}
export default Basic
您可能已经开始工作,但您只需将其附加到点击处理程序即可:
const remove = file => {
const newFiles = [...files]; // make a var for the new array
newFiles.splice(file, 1); // remove the file from the array
setFiles(newFiles); // update the state
};
并传递地图上的号码:
acceptedFiles.map(file...
应该是acceptedFiles.map((file, i)....
然后有
<button type="button" onClick={() => remove(i)> DeleteButton</button>
,其中 i
是数组中文件的编号。
我希望这对你有帮助:
import React, { useState, useEffect, useCallback } from 'react'
import { useDropzone } from 'react-dropzone'
const CreateFileUpload = () => {
const onDrop = useCallback(acceptedFiles => {
// Do something with the files
}, [])
const { getRootProps, getInputProps, isDragActive, acceptedFiles } = useDropzone({ onDrop, accept: '.png, .jpeg' })
const files = acceptedFiles.map((file, i) => (
<li key={file.path} className="selected-file-item">
{file.path} <i className="fa fa-trash text-red" onClick={() => remove(i)}></i>
</li>
));
const remove = file => {
const newFiles = [...files]; // make a var for the new array
acceptedFiles.splice(file, 1); // remove the file from the array
};
return (
<div>
<div {...getRootProps()} className="dropzone-main">
<div
className="ntc-start-files-dropzone"
aria-disabled="false"
>
</div>
<button className="add-button" type="button">
<i className="fa fa-plus"></i>
</button>
<h3 className="upload-title">
<span></span>
</h3>
<input
type="file"
multiple=""
autocomplete="off"
className="inp-file"
// onChange={uploadFile}
multiple
{...getInputProps()}
/>
{isDragActive ?
<div></div>
:
<div>
<p> Upload files </p>
</div>
}
</div>
<aside>
{files.length > 0 ? <h5>Selected Files</h5> : <h5></h5>}
<ul>{files}</ul>
</aside>
</div>
)
}
export default CreateFileUpload
当您删除文件时,将该数据添加到您的状态,它应该允许您访问该数据,以便您可以删除。
大致:
onDrop = (files) => {
// use a foreach loop get the file name using Object.keys
// setState with the file names
// whatever else you need to do to process the file
}
handleDelete = () => {
// use the file names from your state to delete the files
}
在某个地方你必须将它们与 jsx 结合起来。您还需要使其与发送到服务器的任何内容保持同步。这一切都应该通过您的组件状态来完成。
这里的所有答案都有一个缺陷——如果您添加一个文件,删除它,然后再次添加相同的文件,它将不起作用,因为文件输入上没有触发
change
事件(因为您没有清除出来)
需要从钩子上抓住
inputRef
并在删除按钮中将其清除
function DragFile(props) {
const [myFile, setMyFile] = useState();
const { getRootProps, getInputProps, inputRef } = useDropzone({
onDrop: () => { /* setMyFile */ }
...
});
return (
<div>
{!myFile ? (
<div {...getRootProps()}>
<input id="file-claim" {...getInputProps()} />
drop files here
</div>
) : (
{myFile.filename}
<button onClick={() => {
setMyFile(undefined);
inputRef.current.value = "";
}}>remove</button>
)}
</div>
);
}
export default DragFile;