hermit-V2/assets/js/code-copy.js

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JavaScript
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/**
* Utils
*/
// Add code-copy buttons using progressive enhancement
// © 2019. Tom Spencer
// https://www.fiznool.com/blog/2018/09/14/adding-click-to-copy-buttons-to-a-hugo-powered-blog/
(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 {
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if(codeEl.firstElementChild instanceof HTMLTableElement) {
var selection = selectText(codeEl.firstElementChild.firstElementChild.firstElementChild.lastElementChild);
} else {
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);
})();