Adding Line Numbers to HTML Textarea: A Guide
When dealing with
CodeMirror
The most recommended tool for adding line numbers to textareas is CodeMirror. It's a popular open-source JavaScript library that provides a wide range of features for text editing. To use CodeMirror, simply include the library and instantiate it with the appropriate options.
Live Demo
Here's a working demo illustrating the use of CodeMirror for line numbering:
var editor = CodeMirror.fromTextArea(document.getElementById('code'), { lineNumbers: true, mode: 'text/x-perl', theme: 'abbott', });
<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>
Additional Tips
If you're facing issues with line numbers not matching up with the actual lines, it's possible that your monitor's dots per inch (DPI) is set higher than 100%. CodeMirror takes this into account, but other solutions may not.
Conclusion
CodeMirror is a reliable and powerful solution for adding line numbers to textareas in HTML. It provides a range of customization options and integrates seamlessly with HTML elements.
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