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<h1>Value of null for Controlled Input</h1>
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<p>Specifying the <code>value</code> prop on a <a href="/react/docs/forms.html">controlled component</a> prevents the user from changing the input unless you desire so.</p>
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<p>You might have run into a problem where <code>value</code> is specified, but the input can still be changed without consent. In this case, you might have accidentally set <code>value</code> to <code>undefined</code> or <code>null</code>.</p>
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<p>The snippet below shows this phenomenon; after a second, the text becomes editable.</p>
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<div class="highlight"><pre><code class="js language-js" data-lang="js"><span class="cm">/** @jsx React.DOM */</span>
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<span class="nx">React</span><span class="p">.</span><span class="nx">renderComponent</span><span class="p">(</span><span class="o"><</span><span class="nx">input</span> <span class="nx">value</span><span class="o">=</span><span class="s2">"hi"</span> <span class="o">/></span><span class="p">,</span> <span class="nx">mountNode</span><span class="p">);</span>
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<span class="nx">setTimeout</span><span class="p">(</span><span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
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<span class="nx">React</span><span class="p">.</span><span class="nx">renderComponent</span><span class="p">(</span><span class="o"><</span><span class="nx">input</span> <span class="nx">value</span><span class="o">=</span><span class="p">{</span><span class="kc">null</span><span class="p">}</span> <span class="o">/></span><span class="p">,</span> <span class="nx">mountNode</span><span class="p">);</span>
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<span class="p">},</span> <span class="mi">2000</span><span class="p">);</span>
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</code></pre></div>
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