highlightjs-copy

A simple, accessible highlightjs plugin to add a copy button to your codeblocks.

Demo

Check out the 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-copy

Usage

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>

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.