97 lines
3.5 KiB
HTML
97 lines
3.5 KiB
HTML
<!doctype html>
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<title>CodeMirror: Version 2.2 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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<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="#">2.2 upgrade guide</a>
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</ul>
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</div>
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<article>
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<h2>Upgrading to v2.2</h2>
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<p>There are a few things in the 2.2 release that require some care
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when upgrading.</p>
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<h3>No more default.css</h3>
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<p>The default theme is now included
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in <a href="../lib/codemirror.css"><code>codemirror.css</code></a>, so
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you do not have to included it separately anymore. (It was tiny, so
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even if you're not using it, the extra data overhead is negligible.)
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<h3>Different key customization</h3>
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<p>CodeMirror has moved to a system
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where <a href="manual.html#option_keyMap">keymaps</a> are used to
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bind behavior to keys. This means <a href="../demo/emacs.html">custom
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bindings</a> are now possible.</p>
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<p>Three options that influenced key
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behavior, <code>tabMode</code>, <code>enterMode</code>,
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and <code>smartHome</code>, are no longer supported. Instead, you can
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provide custom bindings to influence the way these keys act. This is
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done through the
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new <a href="manual.html#option_extraKeys"><code>extraKeys</code></a>
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option, which can hold an object mapping key names to functionality. A
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simple example would be:</p>
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<pre> extraKeys: {
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"Ctrl-S": function(instance) { saveText(instance.getValue()); },
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"Ctrl-/": "undo"
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}</pre>
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<p>Keys can be mapped either to functions, which will be given the
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editor instance as argument, or to strings, which are mapped through
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functions through the <code>CodeMirror.commands</code> table, which
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contains all the built-in editing commands, and can be inspected and
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extended by external code.</p>
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<p>By default, the <code>Home</code> key is bound to
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the <code>"goLineStartSmart"</code> command, which moves the cursor to
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the first non-whitespace character on the line. You can set do this to
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make it always go to the very start instead:</p>
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<pre> extraKeys: {"Home": "goLineStart"}</pre>
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<p>Similarly, <code>Enter</code> is bound
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to <code>"newlineAndIndent"</code> by default. You can bind it to
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something else to get different behavior. To disable special handling
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completely and only get a newline character inserted, you can bind it
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to <code>false</code>:</p>
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<pre> extraKeys: {"Enter": false}</pre>
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<p>The same works for <code>Tab</code>. If you don't want CodeMirror
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to handle it, bind it to <code>false</code>. The default behaviour is
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to indent the current line more (<code>"indentMore"</code> command),
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and indent it less when shift is held (<code>"indentLess"</code>).
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There are also <code>"indentAuto"</code> (smart indent)
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and <code>"insertTab"</code> commands provided for alternate
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behavior. Or you can write your own handler function to do something
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different altogether.</p>
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<h3>Tabs</h3>
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<p>Handling of tabs changed completely. The display width of tabs can
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now be set with the <code>tabSize</code> option, and tabs can
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be <a href="../demo/visibletabs.html">styled</a> by setting CSS rules
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for the <code>cm-tab</code> class.</p>
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<p>The default width for tabs is now 4, as opposed to the 8 that is
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hard-wired into browsers. If you are relying on 8-space tabs, make
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sure you explicitly set <code>tabSize: 8</code> in your options.</p>
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</article>
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