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