How to Add Copy Code Button in Blogger - Code Box 2026

 

Your blog Post #121-147 all have pre code blocks. User must manually select copy - bad UX. Copy button = 1 click copy = time on page up, users love. Must add to all code boxes auto.

In Post #148, add copy button + syntax highlight.

Step 1: Add Auto Copy Button to All Pre Tags

1. Blogger → Theme → Edit HTML → Find ]]></b:skin> → Above it paste:

/* Copy Code Button Post 148 */
pre{position:relative;background:#0f172a;color:#e2e8f0;border-radius:12px;padding:18px 14px 14px;margin:16px 0;overflow-x:auto;font-size:13px;line-height:1.5;}
pre code{color:#e2e8f0;}
.copy-btn{position:absolute;top:8px;right:8px;background:#fff;color:#000;border:none;padding:5px 10px;border-radius:20px;font-size:11px;font-weight:700;cursor:pointer;box-shadow:0 2px 6px rgba(0,0,0,0.2);}
.copy-btn.copied{background:#10b981;color:#fff;}

2. Find </body> → Above paste:

<script>
// Copy Code Button Auto - Post 148
document.addEventListener('DOMContentLoaded', function(){
  document.querySelectorAll('pre').forEach(function(pre){
    if(pre.querySelector('.copy-btn')) return;
    var btn = document.createElement('button');
    btn.className='copy-btn';
    btn.textContent='Copy';
    btn.onclick = function(){
      var code = pre.innerText.replace(/^Copy/,'').trim();
      navigator.clipboard.writeText(code).then(function(){
        btn.textContent='Copied ✓';
        btn.classList.add('copied');
        setTimeout(function(){ btn.textContent='Copy'; btn.classList.remove('copied'); },2000);
      });
    };
    pre.appendChild(btn);
  });
});
</script>

Now every pre from Post #121-147 gets copy button auto.

Step 2: Add Language Label on Code Box (HTML, CSS, JS)

<div class="code-wrap" data-lang="HTML">
<pre><code>...your code...</code></pre>
</div>

<style>
.code-wrap{position:relative;}
.code-wrap::before{content:attr(data-lang);position:absolute;top:-10px;left:14px;background:#f59e0b;color:#000;font-size:10px;font-weight:700;padding:2px 8px;border-radius:10px;z-index:1;}
</style>

Use data-lang="CSS", "JS", "HTML" to show badge.

Step 3: Syntax Highlight - Lightweight (No External Library)

1. If you want colors, add prism.js lightweight - but our method below no external JS for speed:

<!-- Optional Prism - only if you want colors, adds 30kb -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/themes/prism-tomorrow.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/prism.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.29.0/components/prism-css.min.js"></script>

My advice: Don't add Prism, keep dark theme CSS from Step 1 - faster like Post #131-132 optimization.

Step 4: Add Copy Count Tracking for GA4

btn.onclick = function(){
  navigator.clipboard.writeText(code);
  if(typeof gtag!=='undefined') gtag('event','code_copy', {code_lang: pre.closest('.code-wrap')?.dataset.lang || 'unknown'});
}

Check Analytics → which code copied most = which post most useful → create more like that.

Step 5: Test All Old Posts

1. Open Post #121 → See copy button top right of each code
2. Click → Copied ✓ → Paste in notepad → Should work
3. Mobile check - button visible? If not, add: @media(max-width:600px){.copy-btn{top:6px;right:6px;}}

Post #148 Complete - Copy UX done.

Next Post #149: How to Add Related Posts with Images - advanced grid.