我使用的是ReactJS，当用户点击一个链接时，我想复制一些文本到剪贴板。
我使用Chrome 52，我不需要支持任何其他浏览器。
我不明白为什么这段代码没有导致数据被复制到剪贴板。(代码片段的来源是Reddit的一篇帖子)。
我做错了吗?谁能建议有一个“正确”的方法来实现复制到剪贴板使用reactjs?
copyToClipboard = (text) => {
console.log('text', text)
var textField = document.createElement('textarea')
textField.innerText = text
document.body.appendChild(textField)
textField.select()
document.execCommand('copy')
textField.remove()
}
当前回答
你也可以在函数组件或无状态组件中使用react钩子: PS:确保你通过npm/yarn使用这个命令安装useClippy: NPM安装使用clippy或 纱线添加使用夹头
import React from 'react';
import useClippy from 'use-clippy';
export default function YourComponent() {
// clipboard is the contents of the user's clipboard.
// setClipboard('new value') wil set the contents of the user's clipboard.
const [clipboard, setClipboard] = useClippy();
return (
<div>
{/* Button that demonstrates reading the clipboard. */}
<button
onClick={() => {
alert(`Your clipboard contains: ${clipboard}`);
}}
>
Read my clipboard
</button>
{/* Button that demonstrates writing to the clipboard. */}
<button
onClick={() => {
setClipboard(`Random number: ${Math.random()}`);
}}
>
Copy something
</button>
</div>
);
}
其他回答
您可以使用useRef选择元素中的文本，然后将其复制到剪贴板
import React, { useRef } from "react";
const Comp = () => {
const copyTxt = useRef();
const handleCopyTxt = () => {
let txtDiv = copyTxt.current;
if (document.selection) {
// IE
var range = document.body.createTextRange();
range.moveToElementText(txtDiv);
range.select();
} else if (window.getSelection) {
// other browsers
var range = document.createRange();
range.selectNode(txtDiv);
window.getSelection().removeAllRanges();
window.getSelection().addRange(range);
}
document.execCommand("copy");
}
return ( <div ref={copyTxt} > some text to copied </div> )
}
受@nate回答的启发，我创建了一个withCopyText反应钩子。并且，添加了navigator.clipboard.writeText支持execCommand回退。
钩子意味着它可以跨许多组件重用，而无需重复代码。有关实现，请参阅示例组件CopyText。
import React, { useRef, useState } from 'react';
const withCopyText = (textElementRef) => {
if (!textElementRef) throw 'withCopyText: ref is required';
const [copyStatus, setCopyStatus] = useState('');
const [support, setSupport] = useState({
navigatorClipboard: !!navigator.clipboard,
exec: !!document.queryCommandSupported('copy'),
});
const copyToClipboard = (e) => {
if ('' !== copyStatus) {
setCopyStatus('');
await new Promise((resolve) => setTimeout(resolve, 200));
}
// clipboard.writeText has wide but not 100% support
// https://caniuse.com/?search=writeText
if (support.navigatorClipboard) {
try {
navigator.clipboard.writeText(textElementRef.current.value);
return setCopyStatus('success');
} catch (e) {
setSupport({ ...support, navigatorClipboard: false });
}
}
// execCommand has > 97% support but is deprecated, use it as a fallback
// https://caniuse.com/?search=execCommand
// https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand
if (!support.navigatorClipboard) {
try {
textElementRef.current.select();
document.execCommand('copy');
e.target.focus();
setCopyStatus('success');
} catch (e) {
setSupport({ ...support, exec: false });
return setCopyStatus('fail');
}
}
};
return {
copyStatus,
copyToClipboard,
support: Object.values(support).includes(true),
};
};
const CopyText = ({ text }) => {
const textElementRef = useRef(null);
const { copyStatus, copyToClipboard, support } = withCopyText(textElementRef);
return (
<span>
{support && <button onClick={copyToClipboard}>Copy</button>}
{'success' === copyStatus && <span>Copied to clipboard!</span>}
{'fail' === copyStatus && <span>Sorry, copy to clipboard failed</span>}
<input type="text" ref={textElementRef} value={text} readOnly={true} />
</span>
);
};
export { CopyText, withCopyText };
对于那些试图从DIV而不是文本字段中进行选择的人，下面是代码。代码是不言自明的，但如果你想了解更多信息，请在这里评论:
import React from 'react';
....
//set ref to your div
setRef = (ref) => {
// debugger; //eslint-disable-line
this.dialogRef = ref;
};
createMarkeup = content => ({
__html: content,
});
//following function select and copy data to the clipboard from the selected Div.
//Please note that it is only tested in chrome but compatibility for other browsers can be easily done
copyDataToClipboard = () => {
try {
const range = document.createRange();
const selection = window.getSelection();
range.selectNodeContents(this.dialogRef);
selection.removeAllRanges();
selection.addRange(range);
document.execCommand('copy');
this.showNotification('Macro copied successfully.', 'info');
this.props.closeMacroWindow();
} catch (err) {
// console.log(err); //eslint-disable-line
//alert('Macro copy failed.');
}
};
render() {
return (
<div
id="macroDiv"
ref={(el) => {
this.dialogRef = el;
}}
// className={classes.paper}
dangerouslySetInnerHTML={this.createMarkeup(this.props.content)}
/>
);
}
这是我的代码:
import React from 'react'
class CopyToClipboard extends React.Component {
textArea: any
copyClipBoard = () => {
this.textArea.select()
document.execCommand('copy')
}
render() {
return (
<>
<input style={{display: 'none'}} value="TEXT TO COPY!!" type="text" ref={(textarea) => this.textArea = textarea} />
<div onClick={this.copyClipBoard}>
CLICK
</div>
</>
)
}
}
export default CopyToClipboard
针对React开发者
const preventCopyPasteBody = (state) => {
document.addEventListener(state, (evt) => {
if (evt.target.id === 'body') {
evt.preventDefault();
return false;
}
return false;
}, false);
}
preventCopyPasteBody ("contextmenu")
preventCopyPasteBody ("copy")
preventCopyPasteBody ("paste")
preventCopyPasteBody ("cut")
<Typography id="body" variant="body1" component="div" className={classes.text} style={{ fontSize: fontSize }}>{story}</Typography>
