highlightjs-copy
A simple, accessible highlightjs plugin to add a copy button to your codeblocks.
Demo
Install
Using a CDN
<script src="https://unpkg.com/highlightjs-copy/dist/highlightjs-copy.min.js"></script><link
rel="stylesheet"
href="https://unpkg.com/highlightjs-copy/dist/highlightjs-copy.min.css"
/>NPM
npm install highlightjs-copyUsage
Basic usage
hljs.addPlugin(new CopyButtonPlugin());With a callback
hljs.addPlugin(
new CopyButtonPlugin({
callback: (text, el) => console.log("Copied to clipboard", text),
})
);Modify copied text with hooks
hljs.addPlugin(
new CopyButtonPlugin({
hook: (text, el) => text + "\nCopied from my cool website.",
})
);Advanced hook example
<!-- Code block example -->
<pre>
<code class="language-bash" data-replace="{{YOUR_API_KEY}}" data-replaceWith="grtf32a35bbc...">
gretel configure --key {{YOUR_API_KEY}}
</code>
</pre>
<script>
hljs.addPlugin(
new CopyButtonPlugin({
hook: (text, el) => {
let { replace, replacewith } = el.dataset;
if (replace && replacewith) {
return text.replace(replace, replacewith);
}
return text;
},
callback: (text, el) => {
/* logs `gretel configure --key grtf32a35bbc...` */
console.log(text);
},
})
);
hljs.highlightAll();
</script>Localization
highlightjs-copy supports multiple locales by providing the correct language for accessibility.
hljs.addPlugin(
new CopyButtonPlugin({
lang: "es", // The copy button now says "Copiado!" when selected.
})
);This option is unnecessary if you correctly add the lang attribute to your document. You can override this behavior by providing the lang option as described above.
<html lang="es">
<body>
<!-- The plugin language defaults to `es` to match the document, so manually setting it is unnecessary. -->
<script>
hljs.addPlugin(new CopyButtonPlugin());
</script>
</body>
</html>If the document has no lang set and the lang option is not provided, it will default to en.
Customization
| CSS selector | Details |
|---|---|
.hljs-copy-wrapper |
Applied to the parent <pre> element that wraps the .hljs code. |
.hljs-copy-button |
The copy button itself. The variable --hljs-theme-background is automatically applied to the parent element. This allows the button to inherit the code block's background color. |
[data-copied='true'] |
This data attribute is applied to the copy button and is set to true for two seconds when the copy action is performed. |
.hljs-copy-alert |
A visually hidden status element that announces the copy confirmation to screen readers. |