changemode.html (1717B)
1 <!doctype html> 2 3 <title>CodeMirror: Mode-Changing Demo</title> 4 <meta charset="utf-8"/> 5 <link rel=stylesheet href="../doc/docs.css"> 6 7 <link rel="stylesheet" href="../lib/codemirror.css"> 8 <script src="../lib/codemirror.js"></script> 9 <script src="../mode/javascript/javascript.js"></script> 10 <script src="../mode/scheme/scheme.js"></script> 11 <style type="text/css"> 12 .CodeMirror {border: 1px solid black;} 13 </style> 14 <div id=nav> 15 <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a> 16 17 <ul> 18 <li><a href="../index.html">Home</a> 19 <li><a href="../doc/manual.html">Manual</a> 20 <li><a href="https://github.com/codemirror/codemirror">Code</a> 21 </ul> 22 <ul> 23 <li><a class=active href="#">Mode-Changing</a> 24 </ul> 25 </div> 26 27 <article> 28 <h2>Mode-Changing Demo</h2> 29 <form><textarea id="code" name="code"> 30 ;; If there is Scheme code in here, the editor will be in Scheme mode. 31 ;; If you put in JS instead, it'll switch to JS mode. 32 33 (define (double x) 34 (* x x)) 35 </textarea></form> 36 37 <p>On changes to the content of the above editor, a (crude) script 38 tries to auto-detect the language used, and switches the editor to 39 either JavaScript or Scheme mode based on that.</p> 40 41 <script> 42 var editor = CodeMirror.fromTextArea(document.getElementById("code"), { 43 mode: "scheme", 44 lineNumbers: true 45 }); 46 var pending; 47 editor.on("change", function() { 48 clearTimeout(pending); 49 pending = setTimeout(update, 400); 50 }); 51 function looksLikeScheme(code) { 52 return !/^\s*\(\s*function\b/.test(code) && /^\s*[;\(]/.test(code); 53 } 54 function update() { 55 editor.setOption("mode", looksLikeScheme(editor.getValue()) ? "scheme" : "javascript"); 56 } 57 </script> 58 </article>