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<!doctype html>
<title>CodeMirror: Mode-Changing Demo</title>
<meta charset="utf-8"/>
<link rel=stylesheet href="../doc/docs.css">
<link rel="stylesheet" href="../lib/codemirror.css">
<script src="../lib/codemirror.js"></script>
<script src="../mode/javascript/javascript.js"></script>
<script src="../mode/scheme/scheme.js"></script>
<style type="text/css">
.CodeMirror {border: 1px solid black;}
<div id=nav>
<a href=""><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a>
<li><a href="../index.html">Home</a>
<li><a href="../doc/manual.html">Manual</a>
<li><a href="">Code</a>
<li><a class=active href="#">Mode-Changing</a>
<h2>Mode-Changing Demo</h2>
<form><textarea id="code" name="code">
;; If there is Scheme code in here, the editor will be in Scheme mode.
;; If you put in JS instead, it'll switch to JS mode.
(define (double x)
(* x x))
<p>On changes to the content of the above editor, a (crude) script
tries to auto-detect the language used, and switches the editor to
either JavaScript or Scheme mode based on that.</p>
var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
mode: "scheme",
lineNumbers: true
var pending;
editor.on("change", function() {
pending = setTimeout(update, 400);
function looksLikeScheme(code) {
return !/^\s*\(\s*function\b/.test(code) && /^\s*[;\(]/.test(code);
function update() {
editor.setOption("mode", looksLikeScheme(editor.getValue()) ? "scheme" : "javascript");
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