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<h1>Animation</h1>
<div class="subHeader"></div>
<p><code>ReactTransitions</code> is an easy way to perform CSS transitions and animations when a React component enters or leaves the DOM. It&#39;s inspired by the excellent <a href="http://www.nganimate.org/">ng-animate</a> library.</p>
<h2><a class="anchor" name="getting-started"></a>Getting Started <a class="hash-link" href="#getting-started">#</a></h2>
<p><code>ReactTransitionGroup</code> is the interface to <code>ReactTransitions</code>. This is a simple element that wraps all of the components you are interested in animating. Here&#39;s an example where we fade list items in and out.</p>
<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="cm">/** @jsx React.DOM */</span>
<span class="kd">var</span> <span class="nx">ReactTransitionGroup</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">addons</span><span class="p">.</span><span class="nx">TransitionGroup</span><span class="p">;</span>
<span class="kd">var</span> <span class="nx">TodoList</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span>
<span class="nx">getInitialState</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">{</span><span class="nx">items</span><span class="o">:</span> <span class="p">[</span><span class="s1">&#39;hello&#39;</span><span class="p">,</span> <span class="s1">&#39;world&#39;</span><span class="p">,</span> <span class="s1">&#39;click&#39;</span><span class="p">,</span> <span class="s1">&#39;me&#39;</span><span class="p">]};</span>
<span class="p">},</span>
<span class="nx">handleAdd</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">newItems</span> <span class="o">=</span>
<span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">items</span><span class="p">.</span><span class="nx">concat</span><span class="p">([</span><span class="nx">prompt</span><span class="p">(</span><span class="s1">&#39;Enter some text&#39;</span><span class="p">)]);</span>
<span class="k">this</span><span class="p">.</span><span class="nx">setState</span><span class="p">({</span><span class="nx">items</span><span class="o">:</span> <span class="nx">newItems</span><span class="p">});</span>
<span class="p">},</span>
<span class="nx">handleRemove</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">i</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">newItems</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">items</span><span class="p">;</span>
<span class="nx">newItems</span><span class="p">.</span><span class="nx">splice</span><span class="p">(</span><span class="nx">i</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="k">this</span><span class="p">.</span><span class="nx">setState</span><span class="p">({</span><span class="nx">items</span><span class="o">:</span> <span class="nx">newItems</span><span class="p">});</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="kd">var</span> <span class="nx">items</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">.</span><span class="nx">items</span><span class="p">.</span><span class="nx">map</span><span class="p">(</span><span class="kd">function</span><span class="p">(</span><span class="nx">item</span><span class="p">,</span> <span class="nx">i</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="p">(</span>
<span class="hll"> <span class="o">&lt;</span><span class="nx">div</span> <span class="nx">key</span><span class="o">=</span><span class="p">{</span><span class="nx">i</span><span class="p">}</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">handleRemove</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="nx">i</span><span class="p">)}</span><span class="o">&gt;</span>
</span><span class="hll"> <span class="p">{</span><span class="nx">item</span><span class="p">}</span>
</span><span class="hll"> <span class="o">&lt;</span><span class="err">/div&gt;</span>
</span> <span class="p">);</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="k">return</span> <span class="p">(</span>
<span class="o">&lt;</span><span class="nx">div</span><span class="o">&gt;</span>
<span class="o">&lt;</span><span class="nx">div</span><span class="o">&gt;&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">handleAdd</span><span class="p">}</span> <span class="o">/&gt;&lt;</span><span class="err">/div&gt;</span>
<span class="o">&lt;</span><span class="nx">ReactTransitionGroup</span> <span class="nx">transitionName</span><span class="o">=</span><span class="s2">&quot;example&quot;</span><span class="o">&gt;</span>
<span class="p">{</span><span class="nx">items</span><span class="p">}</span>
<span class="o">&lt;</span><span class="err">/ReactTransitionGroup&gt;</span>
<span class="o">&lt;</span><span class="err">/div&gt;</span>
<span class="p">);</span>
<span class="p">}</span>
<span class="p">});</span>
</code></pre></div>
<p>In this component, when a new item is added to <code>ReactTransitionGroup</code> it will get the <code>example-enter</code> CSS class and the <code>example-enter-active</code> CSS class added in the next tick. This is a convention based on the <code>transitionName</code> prop.</p>
<p>You can use these classes to trigger a CSS animation or transition. For example, try adding this CSS and adding a new list item:</p>
<div class="highlight"><pre><code class="css language-css" data-lang="css"><span class="nc">.example-enter</span> <span class="p">{</span>
<span class="k">opacity</span><span class="o">:</span> <span class="m">0</span><span class="o">.</span><span class="m">01</span><span class="p">;</span>
<span class="n">transition</span><span class="o">:</span> <span class="k">opacity</span> <span class="m">.5s</span> <span class="n">ease</span><span class="o">-</span><span class="n">in</span><span class="p">;</span>
<span class="p">}</span>
<span class="nc">.example-enter.example-enter-active</span> <span class="p">{</span>
<span class="k">opacity</span><span class="o">:</span> <span class="m">1</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
<p>You&#39;ll notice that when you try to remove an item <code>ReactTransitionGroup</code> keeps it in the DOM. If you&#39;re using an unminified build of React with add-ons you&#39;ll see a warning that React was expecting an animation or transition to occur. That&#39;s because <code>ReactTransitionGroup</code> keeps your DOM elements on the page until the animation completes. Try adding this CSS:</p>
<div class="highlight"><pre><code class="css language-css" data-lang="css"><span class="nc">.example-leave</span> <span class="p">{</span>
<span class="k">opacity</span><span class="o">:</span> <span class="m">1</span><span class="p">;</span>
<span class="n">transition</span><span class="o">:</span> <span class="k">opacity</span> <span class="m">.5s</span> <span class="n">ease</span><span class="o">-</span><span class="n">in</span><span class="p">;</span>
<span class="p">}</span>
<span class="nc">.example-leave.example-leave-active</span> <span class="p">{</span>
<span class="k">opacity</span><span class="o">:</span> <span class="m">0</span><span class="o">.</span><span class="m">01</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div><h2><a class="anchor" name="disabling-animations"></a>Disabling Animations <a class="hash-link" href="#disabling-animations">#</a></h2>
<p>You can disable animating <code>enter</code> or <code>leave</code> animations if you want. For example, sometimes you may want an <code>enter</code> animation and no <code>leave</code> animation, but <code>ReactTransitionGroup</code> waits for an animation to complete before removing your DOM node. You can add <code>transitionEnter={false}</code> or <code>transitionLeave={false}</code> props to <code>ReactTransitionGroup</code> to disable these animations.</p>
<h2><a class="anchor" name="rendering-a-different-component"></a>Rendering a Different Component <a class="hash-link" href="#rendering-a-different-component">#</a></h2>
<p>By default <code>ReactTransitionGroup</code> renders as a <code>span</code>. You can change this behavior by providing a <code>component</code> prop. For example, here&#39;s how you would render a <code>&lt;ul&gt;</code>:</p>
<div class="highlight"><pre><code class="javascript language-javascript" data-lang="javascript"><span class="o">&lt;</span><span class="nx">ReactTransitionGroup</span>
<span class="nx">transitionName</span><span class="o">=</span><span class="s2">&quot;example&quot;</span>
<span class="hll"> <span class="nx">component</span><span class="o">=</span><span class="p">{</span><span class="nx">React</span><span class="p">.</span><span class="nx">DOM</span><span class="p">.</span><span class="nx">ul</span><span class="p">}</span><span class="o">&gt;</span>
</span> <span class="p">...</span>
<span class="o">&lt;</span><span class="err">/ReactTransitionGroup&gt;</span>
</code></pre></div>
<p>Every DOM component is under <code>React.DOM</code>. However, <code>component</code> does not need to be a DOM component. It can be any React component you want; even ones you&#39;ve written yourself!</p>
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