scratch/output/Scratch/en/blog/2009-10-Wait-to-hide-a-menu-in-jQuery/index.html
Yann Esposito (Yogsototh) e898fd70f7 regeneration
2010-10-14 15:22:58 +02:00

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<title>Menu waiting to hide himself</title>
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<div class="return"><a href="#entete">&darr; Menu &darr;</a></div>
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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>
<pre class="twilight">
<span class="MetaTagAll"><span class="MetaTagAll">&lt;</span><span class="MetaTagAll">div</span> <span class="MetaTagAll"><span class="MetaTagAll">id</span><span class="MetaTagAll">=</span><span class="String"><span class="String">&quot;</span><span class="String">menuButton</span><span class="String">&quot;</span></span></span><span class="MetaTagAll">&gt;<span class="MetaTagAll">&lt;</span>/</span><span class="MetaTagAll">div</span><span class="MetaTagAll">&gt;</span></span>
<span class="MetaTagAll"><span class="MetaTagAll">&lt;</span><span class="MetaTagAll">div</span> <span class="MetaTagAll"><span class="MetaTagAll">id</span><span class="MetaTagAll">=</span><span class="String"><span class="String">&quot;</span><span class="String">entete</span><span class="String">&quot;</span></span></span><span class="MetaTagAll">&gt;</span></span>
<span class="MetaTagAll"><span class="MetaTagAll">&lt;</span><span class="MetaTagAll">ul</span><span class="MetaTagAll">&gt;</span></span>
<span class="MetaTagInline"><span class="MetaTagInline">&lt;</span><span class="MetaTagInline">li</span><span class="MetaTagInline">&gt;</span></span> menu item 1 <span class="MetaTagInline"><span class="MetaTagInline">&lt;/</span><span class="MetaTagInline">li</span><span class="MetaTagInline">&gt;</span></span>
...
<span class="MetaTagInline"><span class="MetaTagInline">&lt;</span><span class="MetaTagInline">li</span><span class="MetaTagInline">&gt;</span></span> menu item n <span class="MetaTagInline"><span class="MetaTagInline">&lt;/</span><span class="MetaTagInline">li</span><span class="MetaTagInline">&gt;</span></span>
<span class="MetaTagAll"><span class="MetaTagAll">&lt;/</span><span class="MetaTagAll">ul</span><span class="MetaTagAll">&gt;</span></span>
<span class="MetaTagAll"><span class="MetaTagAll">&lt;/</span><span class="MetaTagAll">div</span><span class="MetaTagAll">&gt;</span></span>
</pre>
</div>
<p>CSS: </p>
<div><pre class="twilight">
<span class="CssId"><span class="CssId">#</span>entete</span> {
<span class="CssPropertyName">top</span>: <span class="CssAdditionalConstants">1</span><span class="Keyword">em</span>;
<span class="CssPropertyName">left</span>: <span class="CssAdditionalConstants">0</span>;
<span class="CssPropertyName">position</span>: <span class="CssPropertyValue">fixed</span>;
<span class="CssPropertyName">width</span>: <span class="CssAdditionalConstants">10</span><span class="Keyword">em</span>;
<span class="CssPropertyName">z-index</span>: <span class="CssAdditionalConstants">2000</span>; }
<span class="CssId"><span class="CssId">#</span>entete</span> {
<span class="CssPropertyName">top</span>: <span class="CssAdditionalConstants">1</span><span class="Keyword">em</span>;
<span class="CssPropertyName">height</span>: <span class="CssAdditionalConstants">22</span><span class="Keyword">em</span>;
<span class="CssPropertyName">left</span>: <span class="CssAdditionalConstants">0</span>;
<span class="CssPropertyName">position</span>: <span class="CssPropertyValue">fixed</span>;
<span class="CssPropertyName">width</span>: <span class="CssAdditionalConstants">10</span><span class="Keyword">em</span>; }
</pre></div>
<p>Javascript: </p>
<div><pre class="twilight">
<span class="Storage">var</span> last<span class="Keyword">=</span><span class="Constant">0</span>;
<span class="Comment"><span class="Comment">//</span> will hide the menu in 5 seconds</span>
<span class="Comment"><span class="Comment">//</span> if the variable 'last' has not changed its value</span>
<span class="Storage">function</span> <span class="Entity">autoHideMenu</span>(<span class="Variable">value</span>) {
<span class="SupportFunction">setTimeout</span>(<span class="Storage">function</span>(){
<span class="Keyword">if</span> ( last <span class="Keyword">==</span> value ) { hideMenu(); }
},<span class="Constant">5000</span>);
}
<span class="Keyword">$</span>(<span class="Support">document</span>).ready( <span class="Storage">function</span>() {
<span class="Comment"><span class="Comment">//</span> show the menu when the mouse is on</span>
<span class="Comment"><span class="Comment">//</span> the good area</span>
<span class="Keyword">$</span>(<span class="String"><span class="String">'</span>#menuButton<span class="String">'</span></span>).hover(showMenu);
<span class="Comment"><span class="Comment">//</span> If the mouse is on the menu change the</span>
<span class="Comment"><span class="Comment">//</span> value of 'last'</span>
<span class="Comment"><span class="Comment">//</span> try to hide the menu when the mouse </span>
<span class="Comment"><span class="Comment">//</span> go out off the menu.</span>
<span class="Keyword">$</span>(<span class="String"><span class="String">'</span>#entete<span class="String">'</span></span>).hover(
<span class="Storage">function</span>(){last<span class="Keyword">+</span><span class="Keyword">=</span><span class="Constant">1</span>;},
<span class="Storage">function</span>(){autoHideMenu(last);} );
autoHideMenu(<span class="Constant">0</span>);
});
<span class="Comment"><span class="Comment">//</span> show / hide menu functions details</span>
<span class="Comment"><span class="Comment">//</span> move to the left</span>
<span class="Storage">function</span> <span class="Entity">hideMenu</span>() {
<span class="Keyword">$</span>(<span class="String"><span class="String">'</span>#entete<span class="String">'</span></span>).animate({left:<span class="String"><span class="String">&quot;</span>-10em<span class="String">&quot;</span></span>}, <span class="Constant">500</span> );
}
<span class="Comment"><span class="Comment">//</span> move to right and will try to hide in 5 sec.</span>
<span class="Storage">function</span> <span class="Entity">showMenu</span>() {
<span class="Keyword">$</span>(<span class="String"><span class="String">'</span>#entete<span class="String">'</span></span>).animate({left:<span class="String"><span class="String">&quot;</span>0em<span class="String">&quot;</span></span>}, <span class="Constant">500</span> );
last<span class="Keyword">+</span><span class="Keyword">=</span><span class="Constant">1</span>;
autoHideMenu(last);
}
</pre></div>
<p>Simple and lightweight. No timer (almost), no memory leak, no Date&hellip;</p>
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<a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/">Copyright ©, Yann Esposito</a>
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Created: 10/26/2009
Modified: 05/09/2010
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Entirely done with
<a href="http://www.vim.org">Vim</a>
and
<a href="http://nanoc.stoneship.org">nanoc</a>
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