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Paul O’Shannessy
2013-07-02 13:08:24 -07:00
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blog/2013/06/02/jsfiddle-integration.html
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<h3>Recent posts</h3>
<ul>
<li><a href="/react/blog/2013/07/02/react-v0-4-autobind-by-default.html">New in React v0.4: Autobind by Default</a></li>
<li><a href="/react/blog/2013/06/27/community-roundup-3.html">Community Round-up #3</a></li>
<li><a href="/react/blog/2013/06/21/react-v0-3-3.html">React v0.3.3</a></li>
blog/2013/06/05/why-react.html
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<h3>Recent posts</h3>
<ul>
<li><a href="/react/blog/2013/07/02/react-v0-4-autobind-by-default.html">New in React v0.4: Autobind by Default</a></li>
<li><a href="/react/blog/2013/06/27/community-roundup-3.html">Community Round-up #3</a></li>
<li><a href="/react/blog/2013/06/21/react-v0-3-3.html">React v0.3.3</a></li>
blog/2013/06/12/community-roundup.html
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<h3>Recent posts</h3>
<ul>
<li><a href="/react/blog/2013/07/02/react-v0-4-autobind-by-default.html">New in React v0.4: Autobind by Default</a></li>
<li><a href="/react/blog/2013/06/27/community-roundup-3.html">Community Round-up #3</a></li>
<li><a href="/react/blog/2013/06/21/react-v0-3-3.html">React v0.3.3</a></li>
blog/2013/06/19/community-roundup-2.html
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<h3>Recent posts</h3>
<ul>
<li><a href="/react/blog/2013/07/02/react-v0-4-autobind-by-default.html">New in React v0.4: Autobind by Default</a></li>
<li><a href="/react/blog/2013/06/27/community-roundup-3.html">Community Round-up #3</a></li>
<li><a href="/react/blog/2013/06/21/react-v0-3-3.html">React v0.3.3</a></li>
blog/2013/06/21/react-v0-3-3.html
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<h3>Recent posts</h3>
<ul>
<li><a href="/react/blog/2013/07/02/react-v0-4-autobind-by-default.html">New in React v0.4: Autobind by Default</a></li>
<li><a href="/react/blog/2013/06/27/community-roundup-3.html">Community Round-up #3</a></li>
<li><a href="/react/blog/2013/06/21/react-v0-3-3.html" class="active">React v0.3.3</a></li>
blog/2013/06/27/community-roundup-3.html
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<h3>Recent posts</h3>
<ul>
<li><a href="/react/blog/2013/07/02/react-v0-4-autobind-by-default.html">New in React v0.4: Autobind by Default</a></li>
<li><a href="/react/blog/2013/06/27/community-roundup-3.html" class="active">Community Round-up #3</a></li>
<li><a href="/react/blog/2013/06/21/react-v0-3-3.html">React v0.3.3</a></li>
blog/2013/07/02/react-v0-4-autobind-by-default.html
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<li><a href="/react/blog/2013/07/02/react-v0-4-autobind-by-default.html" class="active">New in React v0.4: Autobind by Default</a></li>
<li><a href="/react/blog/2013/06/27/community-roundup-3.html">Community Round-up #3</a></li>
<li><a href="/react/blog/2013/06/21/react-v0-3-3.html">React v0.3.3</a></li>
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<h1>New in React v0.4: Autobind by Default</h1>
<p class="meta">July 2, 2013 by Paul O'Shannessy</p>
<hr>
<div class="post">
<p>React v0.4 is very close to completion. As we finish it off, we&#39;d like to share with you some of the major changes we&#39;ve made since v0.3. This is the first of several posts we&#39;ll be making over the next week.</p>
<h2>What is React.autoBind?</h2>
<p>If you take a look at most of our current examples, you&#39;ll see us using <code>React.autoBind</code> for event handlers. This is used in place of <code>Function.prototype.bind</code>. Remember that in JS, <a href="http://bonsaiden.github.io/JavaScript-Garden/#function.this">function calls are late-bound</a>. That means that if you simply pass a function around, the <code>this</code> used inside won&#39;t necessarily be the <code>this</code> you expect. <code>Function.prototype.bind</code> creates a new, properly bound, function so that when called, <code>this</code> is exactly what you expect it to be.</p>
<p>Before we launched React, we would write this:</p>
<div class="highlight"><pre><code class="js language-js" data-lang="js"><span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span>
<span class="nx">onClick</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">event</span><span class="p">)</span> <span class="p">{</span><span class="cm">/* do something with this */</span><span class="p">},</span>
<span class="nx">render</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="hll"> <span class="k">return</span> <span class="o">&lt;</span><span class="nx">button</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">onClick</span><span class="p">.</span><span class="nx">bind</span><span class="p">(</span><span class="k">this</span><span class="p">)}</span> <span class="o">/&gt;</span><span class="p">;</span>
</span> <span class="p">}</span>
<span class="p">});</span>
</code></pre></div>
<p>We wrote <code>React.autoBind</code> as a way to cache the function creation and save on memory usage. Since <code>render</code> can get called multiple times, if you used <code>this.onClick.bind(this)</code> you would actually create a new function on each pass. With React v0.3 you were able to write this instead:</p>
<div class="highlight"><pre><code class="js language-js" data-lang="js"><span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span>
<span class="hll"> <span class="nx">onClick</span><span class="o">:</span> <span class="nx">React</span><span class="p">.</span><span class="nx">autoBind</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">event</span><span class="p">)</span> <span class="p">{</span><span class="cm">/* do something with this */</span><span class="p">}),</span>
</span> <span class="nx">render</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="hll"> <span class="k">return</span> <span class="o">&lt;</span><span class="nx">button</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">onClick</span><span class="p">}</span> <span class="o">/&gt;</span><span class="p">;</span>
</span> <span class="p">}</span>
<span class="p">});</span>
</code></pre></div>
<h2>What&#39;s Changing in v0.4?</h2>
<p>After using <code>React.autoBind</code> for a few weeks, we realized that there were very few times that we didn&#39;t want that behavior. So we made it the default! Now all methods defined within <code>React.createClass</code> will already be bound to the correct instance.</p>
<p>Starting with v0.4 you can just write this:</p>
<div class="highlight"><pre><code class="js language-js" data-lang="js"><span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span>
<span class="hll"> <span class="nx">onClick</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">event</span><span class="p">)</span> <span class="p">{</span><span class="cm">/* do something with this */</span><span class="p">},</span>
</span> <span class="nx">render</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="hll"> <span class="k">return</span> <span class="o">&lt;</span><span class="nx">button</span> <span class="nx">onClick</span><span class="o">=</span><span class="p">{</span><span class="k">this</span><span class="p">.</span><span class="nx">onClick</span><span class="p">}</span> <span class="o">/&gt;</span><span class="p">;</span>
</span> <span class="p">}</span>
<span class="p">});</span>
</code></pre></div>
<p>For v0.4 we will simply be making <code>React.autoBind</code> a no-op — it will just return the function you pass to it. Most likely you won&#39;t have to change your code to account for this change, though we encourage you to update. We&#39;ll publish a migration guide documenting this and other changes that come along with React v0.4.</p>
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blog/index.html
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<h3>Recent posts</h3>
<ul>
<li><a href="/react/blog/2013/07/02/react-v0-4-autobind-by-default.html">New in React v0.4: Autobind by Default</a></li>
<li><a href="/react/blog/2013/06/27/community-roundup-3.html">Community Round-up #3</a></li>
<li><a href="/react/blog/2013/06/21/react-v0-3-3.html">React v0.3.3</a></li>
@@ -75,6 +77,23 @@
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<h1><a href="/react/blog/2013/07/02/react-v0-4-autobind-by-default.html">New in React v0.4: Autobind by Default</a></h1>
<p class="meta">July 2, 2013 by Paul O'Shannessy</p>
<hr>
<div class="post">
<p>React v0.4 is very close to completion. As we finish it off, we&#39;d like to share with you some of the major changes we&#39;ve made since v0.3. This is the first of several posts we&#39;ll be making over the next week.</p>
<p>
<a href="/react/blog/2013/07/02/react-v0-4-autobind-by-default.html">Continue Reading &rarr;</a>
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<h1><a href="/react/blog/2013/06/27/community-roundup-3.html">Community Round-up #3</a></h1>
<p class="meta">June 27, 2013 by Vjeux</p>
feed.xml
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@@ -6,6 +6,49 @@
<link>http://facebook.github.io/react</link>
<atom:link href="http://facebook.github.io/react/feed.xml" rel="self" type="application/rss+xml" />
<item>
<title>New in React v0.4: Autobind by Default</title>
<description>&lt;p&gt;React v0.4 is very close to completion. As we finish it off, we&amp;#39;d like to share with you some of the major changes we&amp;#39;ve made since v0.3. This is the first of several posts we&amp;#39;ll be making over the next week.&lt;/p&gt;
&lt;h2&gt;What is React.autoBind?&lt;/h2&gt;
&lt;p&gt;If you take a look at most of our current examples, you&amp;#39;ll see us using &lt;code&gt;React.autoBind&lt;/code&gt; for event handlers. This is used in place of &lt;code&gt;Function.prototype.bind&lt;/code&gt;. Remember that in JS, &lt;a href=&quot;http://bonsaiden.github.io/JavaScript-Garden/#function.this&quot;&gt;function calls are late-bound&lt;/a&gt;. That means that if you simply pass a function around, the &lt;code&gt;this&lt;/code&gt; used inside won&amp;#39;t necessarily be the &lt;code&gt;this&lt;/code&gt; you expect. &lt;code&gt;Function.prototype.bind&lt;/code&gt; creates a new, properly bound, function so that when called, &lt;code&gt;this&lt;/code&gt; is exactly what you expect it to be.&lt;/p&gt;
&lt;p&gt;Before we launched React, we would write this:&lt;/p&gt;
&lt;div class=&quot;highlight&quot;&gt;&lt;pre&gt;&lt;code class=&quot;js language-js&quot; data-lang=&quot;js&quot;&gt;&lt;span class=&quot;nx&quot;&gt;React&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;createClass&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;({&lt;/span&gt;
&lt;span class=&quot;nx&quot;&gt;onClick&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;:&lt;/span&gt; &lt;span class=&quot;kd&quot;&gt;function&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;event&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;)&lt;/span&gt; &lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;&lt;span class=&quot;cm&quot;&gt;/* do something with this */&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;},&lt;/span&gt;
&lt;span class=&quot;nx&quot;&gt;render&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;:&lt;/span&gt; &lt;span class=&quot;kd&quot;&gt;function&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;
&lt;span class=&quot;hll&quot;&gt; &lt;span class=&quot;k&quot;&gt;return&lt;/span&gt; &lt;span class=&quot;o&quot;&gt;&amp;lt;&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;button&lt;/span&gt; &lt;span class=&quot;nx&quot;&gt;onClick&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;=&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;&lt;span class=&quot;k&quot;&gt;this&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;onClick&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;bind&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;k&quot;&gt;this&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;)}&lt;/span&gt; &lt;span class=&quot;o&quot;&gt;/&amp;gt;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;;&lt;/span&gt;
&lt;/span&gt; &lt;span class=&quot;p&quot;&gt;}&lt;/span&gt;
&lt;span class=&quot;p&quot;&gt;});&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;
&lt;p&gt;We wrote &lt;code&gt;React.autoBind&lt;/code&gt; as a way to cache the function creation and save on memory usage. Since &lt;code&gt;render&lt;/code&gt; can get called multiple times, if you used &lt;code&gt;this.onClick.bind(this)&lt;/code&gt; you would actually create a new function on each pass. With React v0.3 you were able to write this instead:&lt;/p&gt;
&lt;div class=&quot;highlight&quot;&gt;&lt;pre&gt;&lt;code class=&quot;js language-js&quot; data-lang=&quot;js&quot;&gt;&lt;span class=&quot;nx&quot;&gt;React&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;createClass&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;({&lt;/span&gt;
&lt;span class=&quot;hll&quot;&gt; &lt;span class=&quot;nx&quot;&gt;onClick&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;:&lt;/span&gt; &lt;span class=&quot;nx&quot;&gt;React&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;autoBind&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;kd&quot;&gt;function&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;event&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;)&lt;/span&gt; &lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;&lt;span class=&quot;cm&quot;&gt;/* do something with this */&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;}),&lt;/span&gt;
&lt;/span&gt; &lt;span class=&quot;nx&quot;&gt;render&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;:&lt;/span&gt; &lt;span class=&quot;kd&quot;&gt;function&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;
&lt;span class=&quot;hll&quot;&gt; &lt;span class=&quot;k&quot;&gt;return&lt;/span&gt; &lt;span class=&quot;o&quot;&gt;&amp;lt;&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;button&lt;/span&gt; &lt;span class=&quot;nx&quot;&gt;onClick&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;=&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;&lt;span class=&quot;k&quot;&gt;this&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;onClick&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;}&lt;/span&gt; &lt;span class=&quot;o&quot;&gt;/&amp;gt;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;;&lt;/span&gt;
&lt;/span&gt; &lt;span class=&quot;p&quot;&gt;}&lt;/span&gt;
&lt;span class=&quot;p&quot;&gt;});&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;
&lt;h2&gt;What&amp;#39;s Changing in v0.4?&lt;/h2&gt;
&lt;p&gt;After using &lt;code&gt;React.autoBind&lt;/code&gt; for a few weeks, we realized that there were very few times that we didn&amp;#39;t want that behavior. So we made it the default! Now all methods defined within &lt;code&gt;React.createClass&lt;/code&gt; will already be bound to the correct instance.&lt;/p&gt;
&lt;p&gt;Starting with v0.4 you can just write this:&lt;/p&gt;
&lt;div class=&quot;highlight&quot;&gt;&lt;pre&gt;&lt;code class=&quot;js language-js&quot; data-lang=&quot;js&quot;&gt;&lt;span class=&quot;nx&quot;&gt;React&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;createClass&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;({&lt;/span&gt;
&lt;span class=&quot;hll&quot;&gt; &lt;span class=&quot;nx&quot;&gt;onClick&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;:&lt;/span&gt; &lt;span class=&quot;kd&quot;&gt;function&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;event&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;)&lt;/span&gt; &lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;&lt;span class=&quot;cm&quot;&gt;/* do something with this */&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;},&lt;/span&gt;
&lt;/span&gt; &lt;span class=&quot;nx&quot;&gt;render&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;:&lt;/span&gt; &lt;span class=&quot;kd&quot;&gt;function&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;()&lt;/span&gt; &lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;
&lt;span class=&quot;hll&quot;&gt; &lt;span class=&quot;k&quot;&gt;return&lt;/span&gt; &lt;span class=&quot;o&quot;&gt;&amp;lt;&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;button&lt;/span&gt; &lt;span class=&quot;nx&quot;&gt;onClick&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;=&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;{&lt;/span&gt;&lt;span class=&quot;k&quot;&gt;this&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;nx&quot;&gt;onClick&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;}&lt;/span&gt; &lt;span class=&quot;o&quot;&gt;/&amp;gt;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;;&lt;/span&gt;
&lt;/span&gt; &lt;span class=&quot;p&quot;&gt;}&lt;/span&gt;
&lt;span class=&quot;p&quot;&gt;});&lt;/span&gt;
&lt;/code&gt;&lt;/pre&gt;&lt;/div&gt;
&lt;p&gt;For v0.4 we will simply be making &lt;code&gt;React.autoBind&lt;/code&gt; a no-op — it will just return the function you pass to it. Most likely you won&amp;#39;t have to change your code to account for this change, though we encourage you to update. We&amp;#39;ll publish a migration guide documenting this and other changes that come along with React v0.4.&lt;/p&gt;
</description>
<pubDate>2013-07-02T00:00:00-07:00</pubDate>
<link>http://facebook.github.io/react/blog/2013/07/02/react-v0-4-autobind-by-default.html</link>
<guid isPermaLink="true">http://facebook.github.io/react/blog/2013/07/02/react-v0-4-autobind-by-default.html</guid>
</item>
<item>
<title>Community Round-up #3</title>
<description>&lt;p&gt;The highlight of this week is that an interaction-heavy app has been ported to React. React components are solving issues they had with nested views.&lt;/p&gt;