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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> .CodeMirror {border: 1px solid black;} </style><div id=nav> <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../doc/logo.png"></a>
<ul> <li><a href="../index.html">Home</a> <li><a href="../doc/manual.html">Manual</a> <li><a href="https://github.com/codemirror/codemirror5">Code</a> </ul> <ul> <li><a class=active href="#">Mode-Changing</a> </ul></div>
<article><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))</textarea></form>
<p>On changes to the content of the above editor, a (crude) scripttries to auto-detect the language used, and switches the editor toeither JavaScript or Scheme mode based on that.</p>
<script> var editor = CodeMirror.fromTextArea(document.getElementById("code"), { mode: "scheme", lineNumbers: true }); var pending; editor.on("change", function() { clearTimeout(pending); 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"); }</script> </article>
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