Line Number Enhancements for HTML Textarea Question: How can line numbers be displayed in the left margin of a element?</p> <p><strong>Answer:</strong></p> <p><strong>Introducing CodeMirror</strong></p> <p>Highly recommended by members of the community is CodeMirror, a powerful tool that excels in displaying line numbers.</p> <p><strong>Implementation</strong></p> <p>CodeMirror offers effortless integration. Incorporate it into your project by implementing the following code:</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre>var editor = CodeMirror.fromTextArea(document.getElementById('code'), { lineNumbers: true, mode: 'text/x-perl', theme: 'abbott', });</pre><div class="contentsignin">Copy after login</div></div> <p>In this example:</p> <ul> <li>The lineNumbers property enables line numbering.</li> <li>mode specifies the syntax highlighting for Perl.</li> <li>theme sets the appearance of the editor to "Abbott" style.</li> </ul> <p><strong>Demo</strong></p> <p>Experience a fully functional demonstration of CodeMirror with line numbers within the StackOverflow sandbox:</p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre><script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/6.65.7/codemirror.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/6.65.7/mode/perl/perl.min.js"></script> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/6.65.7/codemirror.min.css"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/6.65.7/theme/abbott.min.css"> <textarea></pre><div class="contentsignin">Copy after login</div></div> <p><strong>Additional Considerations</strong></p> <p>Other solutions may encounter issues with line number alignment. This is often due to monitor DPI settings that are not accounted for. However, CodeMirror handles these situations effectively.</p>
