231 lines
8.3 KiB
HTML
Executable File
231 lines
8.3 KiB
HTML
Executable File
<!doctype html>
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<title>CodeMirror: Version 3 upgrade guide</title>
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<meta charset="utf-8"/>
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<link rel=stylesheet href="docs.css">
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<script src="../lib/codemirror.js"></script>
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<link rel="stylesheet" href="../lib/codemirror.css">
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<script src="../addon/runmode/runmode.js"></script>
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<script src="../addon/runmode/colorize.js"></script>
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<script src="../mode/javascript/javascript.js"></script>
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<script src="../mode/xml/xml.js"></script>
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<script src="../mode/css/css.js"></script>
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<script src="../mode/htmlmixed/htmlmixed.js"></script>
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<script src="activebookmark.js"></script>
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<div id=nav>
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<a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="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="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="#upgrade">Upgrade guide</a>
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<li><a href="#dom">DOM structure</a></li>
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<li><a href="#gutters">Gutter model</a></li>
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<li><a href="#events">Event handling</a></li>
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<li><a href="#marktext">markText method arguments</a></li>
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<li><a href="#folding">Line folding</a></li>
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<li><a href="#lineclass">Line CSS classes</a></li>
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<li><a href="#positions">Position properties</a></li>
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<li><a href="#matchbrackets">Bracket matching</a></li>
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<li><a href="#modes">Mode management</a></li>
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<li><a href="#new">New features</a></li>
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</ul>
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</div>
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<article>
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<h2 id=upgrade>Upgrading to version 3</h2>
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<p>Version 3 does not depart too much from 2.x API, and sites that use
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CodeMirror in a very simple way might be able to upgrade without
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trouble. But it does introduce a number of incompatibilities. Please
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at least skim this text before upgrading.</p>
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<p>Note that <strong>version 3 drops full support for Internet
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Explorer 7</strong>. The editor will mostly work on that browser, but
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it'll be significantly glitchy.</p>
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<section id=dom>
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<h2>DOM structure</h2>
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<p>This one is the most likely to cause problems. The internal
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structure of the editor has changed quite a lot, mostly to implement a
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new scrolling model.</p>
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<p>Editor height is now set on the outer wrapper element (CSS
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class <code>CodeMirror</code>), not on the scroller element
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(<code>CodeMirror-scroll</code>).</p>
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<p>Other nodes were moved, dropped, and added. If you have any code
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that makes assumptions about the internal DOM structure of the editor,
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you'll have to re-test it and probably update it to work with v3.</p>
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<p>See the <a href="manual.html#styling">styling section</a> of the
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manual for more information.</p>
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</section>
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<section id=gutters>
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<h2>Gutter model</h2>
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<p>In CodeMirror 2.x, there was a single gutter, and line markers
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created with <code>setMarker</code> would have to somehow coexist with
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the line numbers (if present). Version 3 allows you to specify an
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array of gutters, <a href="manual.html#option_gutters">by class
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name</a>,
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use <a href="manual.html#setGutterMarker"><code>setGutterMarker</code></a>
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to add or remove markers in individual gutters, and clear whole
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gutters
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with <a href="manual.html#clearGutter"><code>clearGutter</code></a>.
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Gutter markers are now specified as DOM nodes, rather than HTML
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snippets.</p>
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<p>The gutters no longer horizontally scrolls along with the content.
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The <code>fixedGutter</code> option was removed (since it is now the
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only behavior).</p>
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<pre data-lang="text/html">
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<style>
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/* Define a gutter style */
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.note-gutter { width: 3em; background: cyan; }
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</style>
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<script>
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// Create an instance with two gutters -- line numbers and notes
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var cm = new CodeMirror(document.body, {
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gutters: ["note-gutter", "CodeMirror-linenumbers"],
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lineNumbers: true
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});
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// Add a note to line 0
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cm.setGutterMarker(0, "note-gutter", document.createTextNode("hi"));
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</script>
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</pre>
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</section>
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<section id=events>
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<h2>Event handling</h2>
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<p>Most of the <code>onXYZ</code> options have been removed. The same
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effect is now obtained by calling
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the <a href="manual.html#on"><code>on</code></a> method with a string
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identifying the event type. Multiple handlers can now be registered
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(and individually unregistered) for an event, and objects such as line
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handlers now also expose events. See <a href="manual.html#events">the
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full list here</a>.</p>
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<p>(The <code>onKeyEvent</code> and <code>onDragEvent</code> options,
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which act more as hooks than as event handlers, are still there in
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their old form.)</p>
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<pre data-lang="javascript">
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cm.on("change", function(cm, change) {
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console.log("something changed! (" + change.origin + ")");
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});
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</pre>
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</section>
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<section id=marktext>
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<h2>markText method arguments</h2>
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<p>The <a href="manual.html#markText"><code>markText</code></a> method
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(which has gained some interesting new features, such as creating
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atomic and read-only spans, or replacing spans with widgets) no longer
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takes the CSS class name as a separate argument, but makes it an
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optional field in the options object instead.</p>
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<pre data-lang="javascript">
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// Style first ten lines, and forbid the cursor from entering them
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cm.markText({line: 0, ch: 0}, {line: 10, ch: 0}, {
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className: "magic-text",
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inclusiveLeft: true,
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atomic: true
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});
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</pre>
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</section>
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<section id=folding>
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<h2>Line folding</h2>
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<p>The interface for hiding lines has been
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removed. <a href="manual.html#markText"><code>markText</code></a> can
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now be used to do the same in a more flexible and powerful way.</p>
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<p>The <a href="../demo/folding.html">folding script</a> has been
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updated to use the new interface, and should now be more robust.</p>
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<pre data-lang="javascript">
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// Fold a range, replacing it with the text "??"
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var range = cm.markText({line: 4, ch: 2}, {line: 8, ch: 1}, {
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replacedWith: document.createTextNode("??"),
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// Auto-unfold when cursor moves into the range
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clearOnEnter: true
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});
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// Get notified when auto-unfolding
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CodeMirror.on(range, "clear", function() {
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console.log("boom");
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});
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</pre>
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</section>
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<section id=lineclass>
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<h2>Line CSS classes</h2>
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<p>The <code>setLineClass</code> method has been replaced
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by <a href="manual.html#addLineClass"><code>addLineClass</code></a>
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and <a href="manual.html#removeLineClass"><code>removeLineClass</code></a>,
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which allow more modular control over the classes attached to a line.</p>
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<pre data-lang="javascript">
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var marked = cm.addLineClass(10, "background", "highlighted-line");
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setTimeout(function() {
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cm.removeLineClass(marked, "background", "highlighted-line");
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});
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</pre>
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</section>
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<section id=positions>
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<h2>Position properties</h2>
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<p>All methods that take or return objects that represent screen
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positions now use <code>{left, top, bottom, right}</code> properties
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(not always all of them) instead of the <code>{x, y, yBot}</code> used
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by some methods in v2.x.</p>
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<p>Affected methods
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are <a href="manual.html#cursorCoords"><code>cursorCoords</code></a>, <a href="manual.html#charCoords"><code>charCoords</code></a>, <a href="manual.html#coordsChar"><code>coordsChar</code></a>,
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and <a href="manual.html#getScrollInfo"><code>getScrollInfo</code></a>.</p>
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</section>
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<section id=matchbrackets>
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<h2>Bracket matching no longer in core</h2>
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<p>The <a href="manual.html#addon_matchbrackets"><code>matchBrackets</code></a>
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option is no longer defined in the core editor.
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Load <code>addon/edit/matchbrackets.js</code> to enable it.</p>
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</section>
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<section id=modes>
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<h2>Mode management</h2>
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<p>The <code>CodeMirror.listModes</code>
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and <code>CodeMirror.listMIMEs</code> functions, used for listing
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defined modes, are gone. You are now encouraged to simply
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inspect <code>CodeMirror.modes</code> (mapping mode names to mode
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constructors) and <code>CodeMirror.mimeModes</code> (mapping MIME
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strings to mode specs).</p>
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</section>
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<section id=new>
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<h2>New features</h2>
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<p>Some more reasons to upgrade to version 3.</p>
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<ul>
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<li>Bi-directional text support. CodeMirror will now mostly do the
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right thing when editing Arabic or Hebrew text.</li>
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<li>Arbitrary line heights. Using fonts with different heights
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inside the editor (whether off by one pixel or fifty) is now
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supported and handled gracefully.</li>
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<li>In-line widgets. See <a href="../demo/widget.html">the demo</a>
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and <a href="manual.html#addLineWidget">the docs</a>.</li>
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<li>Defining custom options
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with <a href="manual.html#defineOption"><code>CodeMirror.defineOption</code></a>.</li>
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</ul>
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</section>
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</article>
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<script>setTimeout(function(){CodeMirror.colorize();}, 20);</script>
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