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<h1>Menu waiting to hide himself</h1>
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<p>I discussed <a href="../../../../Scratch/en/blog/2009-10-Focus-vs-Minimalism">earlier why I prefer to hide my navigation menu</a>. I finally decided to hide it only after a short time. Just the time needed for a user to see it. But how make it disappear only when it is not used for some time?</p>
<p>Here is how to accomplish that easily.</p>
<p>HTML:</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode html"><code class="sourceCode html"><a class="sourceLine" id="cb1-1" title="1"> <span class="kw">&lt;div</span><span class="ot"> id=</span><span class="st">&quot;menuButton&quot;</span><span class="kw">&gt;&lt;/div&gt;</span></a>
<a class="sourceLine" id="cb1-2" title="2"> <span class="kw">&lt;div</span><span class="ot"> id=</span><span class="st">&quot;entete&quot;</span><span class="kw">&gt;</span></a>
<a class="sourceLine" id="cb1-3" title="3"> <span class="kw">&lt;ul&gt;</span></a>
<a class="sourceLine" id="cb1-4" title="4"> <span class="kw">&lt;li&gt;</span> menu item 1 <span class="kw">&lt;/li&gt;</span></a>
<a class="sourceLine" id="cb1-5" title="5"> ...</a>
<a class="sourceLine" id="cb1-6" title="6"> <span class="kw">&lt;li&gt;</span> menu item n <span class="kw">&lt;/li&gt;</span></a>
<a class="sourceLine" id="cb1-7" title="7"> <span class="kw">&lt;/ul&gt;</span></a>
<a class="sourceLine" id="cb1-8" title="8"> <span class="kw">&lt;/div&gt;</span></a></code></pre></div>
<p>CSS:</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode css"><code class="sourceCode css"><a class="sourceLine" id="cb2-1" title="1"> <span class="pp">#entete</span> {</a>
<a class="sourceLine" id="cb2-2" title="2"> <span class="kw">top</span>: <span class="dv">1</span><span class="dt">em</span><span class="op">;</span></a>
<a class="sourceLine" id="cb2-3" title="3"> <span class="kw">left</span>: <span class="dv">0</span><span class="op">;</span></a>
<a class="sourceLine" id="cb2-4" title="4"> <span class="kw">position</span>: <span class="dv">fixed</span><span class="op">;</span></a>
<a class="sourceLine" id="cb2-5" title="5"> <span class="kw">width</span>: <span class="dv">10</span><span class="dt">em</span><span class="op">;</span></a>
<a class="sourceLine" id="cb2-6" title="6"> <span class="kw">z-index</span>: <span class="dv">2000</span><span class="op">;</span> }</a>
<a class="sourceLine" id="cb2-7" title="7"></a>
<a class="sourceLine" id="cb2-8" title="8"> <span class="pp">#entete</span> {</a>
<a class="sourceLine" id="cb2-9" title="9"> <span class="kw">top</span>: <span class="dv">1</span><span class="dt">em</span><span class="op">;</span></a>
<a class="sourceLine" id="cb2-10" title="10"> <span class="kw">height</span>: <span class="dv">22</span><span class="dt">em</span><span class="op">;</span></a>
<a class="sourceLine" id="cb2-11" title="11"> <span class="kw">left</span>: <span class="dv">0</span><span class="op">;</span></a>
<a class="sourceLine" id="cb2-12" title="12"> <span class="kw">position</span>: <span class="dv">fixed</span><span class="op">;</span></a>
<a class="sourceLine" id="cb2-13" title="13"> <span class="kw">width</span>: <span class="dv">10</span><span class="dt">em</span><span class="op">;</span> }</a></code></pre></div>
<p>Javascript:</p>
<div class="sourceCode" id="cb3"><pre class="sourceCode js"><code class="sourceCode javascript"><a class="sourceLine" id="cb3-1" title="1"><span class="kw">var</span> last<span class="op">=</span><span class="dv">0</span><span class="op">;</span></a>
<a class="sourceLine" id="cb3-2" title="2"></a>
<a class="sourceLine" id="cb3-3" title="3"><span class="co">// will hide the menu in 5 seconds</span></a>
<a class="sourceLine" id="cb3-4" title="4"><span class="co">// if the variable 'last' has not changed its value</span></a>
<a class="sourceLine" id="cb3-5" title="5"><span class="kw">function</span> <span class="at">autoHideMenu</span>(value) <span class="op">{</span></a>
<a class="sourceLine" id="cb3-6" title="6"> <span class="at">setTimeout</span>(<span class="kw">function</span>()<span class="op">{</span></a>
<a class="sourceLine" id="cb3-7" title="7"> <span class="cf">if</span> ( last <span class="op">==</span> value ) <span class="op">{</span> <span class="at">hideMenu</span>()<span class="op">;</span> <span class="op">}</span></a>
<a class="sourceLine" id="cb3-8" title="8"> <span class="op">},</span><span class="dv">5000</span>)<span class="op">;</span></a>
<a class="sourceLine" id="cb3-9" title="9"><span class="op">}</span></a>
<a class="sourceLine" id="cb3-10" title="10"></a>
<a class="sourceLine" id="cb3-11" title="11"><span class="at">$</span>(document).<span class="at">ready</span>( <span class="kw">function</span>() <span class="op">{</span></a>
<a class="sourceLine" id="cb3-12" title="12"> <span class="co">// show the menu when the mouse is on</span></a>
<a class="sourceLine" id="cb3-13" title="13"> <span class="co">// the good area</span></a>
<a class="sourceLine" id="cb3-14" title="14"> <span class="at">$</span>(<span class="st">'#menuButton'</span>).<span class="at">hover</span>(showMenu)<span class="op">;</span></a>
<a class="sourceLine" id="cb3-15" title="15"></a>
<a class="sourceLine" id="cb3-16" title="16"> <span class="co">// If the mouse is on the menu change the</span></a>
<a class="sourceLine" id="cb3-17" title="17"> <span class="co">// value of 'last'</span></a>
<a class="sourceLine" id="cb3-18" title="18"> <span class="co">// try to hide the menu when the mouse </span></a>
<a class="sourceLine" id="cb3-19" title="19"> <span class="co">// go out off the menu.</span></a>
<a class="sourceLine" id="cb3-20" title="20"> <span class="at">$</span>(<span class="st">'#entete'</span>).<span class="at">hover</span>(</a>
<a class="sourceLine" id="cb3-21" title="21"> <span class="kw">function</span>()<span class="op">{</span>last<span class="op">+=</span><span class="dv">1</span><span class="op">;},</span> </a>
<a class="sourceLine" id="cb3-22" title="22"> <span class="kw">function</span>()<span class="op">{</span><span class="at">autoHideMenu</span>(last)<span class="op">;}</span> )<span class="op">;</span></a>
<a class="sourceLine" id="cb3-23" title="23"> <span class="at">autoHideMenu</span>(<span class="dv">0</span>)<span class="op">;</span></a>
<a class="sourceLine" id="cb3-24" title="24"><span class="op">}</span>)<span class="op">;</span></a>
<a class="sourceLine" id="cb3-25" title="25"></a>
<a class="sourceLine" id="cb3-26" title="26"><span class="co">// show / hide menu functions details</span></a>
<a class="sourceLine" id="cb3-27" title="27"></a>
<a class="sourceLine" id="cb3-28" title="28"><span class="co">// move to the left</span></a>
<a class="sourceLine" id="cb3-29" title="29"><span class="kw">function</span> <span class="at">hideMenu</span>() <span class="op">{</span> </a>
<a class="sourceLine" id="cb3-30" title="30"> <span class="at">$</span>(<span class="st">'#entete'</span>).<span class="at">animate</span>(<span class="op">{</span><span class="dt">left</span><span class="op">:</span><span class="st">&quot;-10em&quot;</span><span class="op">},</span> <span class="dv">500</span> )<span class="op">;</span> </a>
<a class="sourceLine" id="cb3-31" title="31"><span class="op">}</span></a>
<a class="sourceLine" id="cb3-32" title="32"></a>
<a class="sourceLine" id="cb3-33" title="33"><span class="co">// move to right and will try to hide in 5 sec.</span></a>
<a class="sourceLine" id="cb3-34" title="34"><span class="kw">function</span> <span class="at">showMenu</span>() <span class="op">{</span></a>
<a class="sourceLine" id="cb3-35" title="35"> <span class="at">$</span>(<span class="st">'#entete'</span>).<span class="at">animate</span>(<span class="op">{</span><span class="dt">left</span><span class="op">:</span><span class="st">&quot;0em&quot;</span><span class="op">},</span> <span class="dv">500</span> )<span class="op">;</span></a>
<a class="sourceLine" id="cb3-36" title="36"> last<span class="op">+=</span><span class="dv">1</span><span class="op">;</span></a>
<a class="sourceLine" id="cb3-37" title="37"> <span class="at">autoHideMenu</span>(last)<span class="op">;</span></a>
<a class="sourceLine" id="cb3-38" title="38"><span class="op">}</span></a></code></pre></div>
<p>Simple and lightweight. No timer (almost), no memory leak, no Date…</p>
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