现代风
使用 Async Clipboard API
如需程序化地读取用户剪贴板中的文本(例如,在点击按钮后),您可以使用 Async Clipboard API 的 readText()
方法。如果尚未授予读取剪贴板的权限,则对 navigator.clipboard.readText()
的调用将在首次调用该方法时请求这些权限。
const pasteButton = document.querySelector('#paste-button');
pasteButton.addEventListener('click', async () => {
try {
const text = await navigator.clipboard.readText()
document.querySelector('textarea').value += text;
console.log('Text pasted.');
} catch (error) {
console.log('Failed to read clipboard');
}
});
经典路线
使用 document.execCommand()
通过使用 document.execCommand('paste')
,您可以将剪贴板内容粘贴到插入点(当前获得焦点的 HTML 元素)。execCommand
方法会返回一个布尔值,指示 paste
事件是否成功。不过,这种方法存在局限性,例如,由于它是同步的,粘贴大量数据可能会阻塞网页。
pasteButton.addEventListener('click', () => {
document.querySelector('textarea').focus();
const result = document.execCommand('paste')
console.log('document.execCommand result: ', result);
})
渐进式增强
pasteButton.addEventListener('click', async () => {
try {
const text = await navigator.clipboard.readText()
document.querySelector('textarea').value += text;
console.log('Text pasted.');
} catch (error) {
console.log('Failed to read clipboard. Using execCommand instead.');
document.querySelector('textarea').focus();
const result = document.execCommand('paste')
console.log('document.execCommand result: ', result);
}
});
深入阅读
演示
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link
rel="icon"
href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>🎉</text></svg>"
/>
<title>How to paste text</title>
</head>
<body>
<h1>How to paste text</h1>
<p>
<button type="button">Paste</button>
</p>
<textarea></textarea>
</body>
</html>
:root {
color-scheme: dark light;
}
html {
box-sizing: border-box;
}
*,
*:before,
*:after {
box-sizing: inherit;
}
body {
margin: 1rem;
font-family: system-ui, sans-serif;
}
button {
display: block;
}
const pasteButton = document.querySelector('button');
pasteButton.addEventListener('click', async () => {
try {
const text = await navigator.clipboard.readText()
document.querySelector('textarea').value += text;
console.log('Text pasted.');
} catch (error) {
console.log('Failed to read clipboard. Using execCommand instead.');
document.querySelector('textarea').focus();
const result = document.execCommand('paste')
console.log('document.execCommand result: ', result);
}
});