The code is a tweak of the code given by Tom Spencer
Javascript
Create a js file where you will store all your Javascript, I am storing mine at /static/js/copy-code.js
This will control all your HTML elements as well as the “brain” behind the button
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(function() {
'use strict';
if(!document.queryCommandSupported('copy')) {
return;
}
function flashCopyMessage(el, msg) {
el.textContent = msg;
setTimeout(function() {
el.textContent = "Copy";
}, 1000);
}
function selectText(node) {
var selection = window.getSelection();
var range = document.createRange();
range.selectNodeContents(node);
selection.removeAllRanges();
selection.addRange(range);
return selection;
}
function addCopyButton(containerEl) {
var copyBtn = document.createElement("button");
copyBtn.className = "highlight-copy-btn";
copyBtn.textContent = "Copy";
var codeEl = containerEl.firstElementChild;
copyBtn.addEventListener('click', function() {
try {
var selection = selectText(codeEl);
document.execCommand('copy');
selection.removeAllRanges();
flashCopyMessage(copyBtn, 'Copied!')
} catch(e) {
console && console.log(e);
flashCopyMessage(copyBtn, 'Failed :\'(')
}
});
containerEl.appendChild(copyBtn);
}
// Add copy button to code blocks
var highlightBlocks = document.getElementsByClassName('highlight');
Array.prototype.forEach.call(highlightBlocks, addCopyButton);
})();
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CSS
CSS is quite subjective but this can start as the starting point
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.highlight {
position: relative;
}
.highlight pre {
padding-right: 75px;
}
.highlight-copy-btn {
position: absolute;
bottom: 7px;
right: 7px;
border: 0;
border-radius: 4px;
padding: 1px;
font-size: 0.7em;
line-height: 1.8;
color: #fff;
background-color: #777;
min-width: 55px;
text-align: center;
}
.highlight-copy-btn:hover {
background-color: #666;
}
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To actually show the button, you have to put the following code in post.html (displays the button in posts ONLY) or baseof.html (displays the button globally)
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{{ if (findRE "pre.*?" .Content 1) }}
<script src="/js/copy-code.js"></script>
{{ end }}
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that’s it <3