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POPrototypeJS: Selecting the odd subset of visible children
 

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    <p>This is related to my <a href="https://stackoverflow.com/questions/796273/prototypejs-selecting-visible-elements">previous question about selecting visible elements</a>. Now, here's the twist: Let's say I want to select the odd children only from the set of visible children of an element. What would be the best way to do this?</p> <p>Edit: here is an example of my input and expected output.</p> <pre><code>&lt;!-- A list with some visible and invisible children --&gt; &lt;ul class="stripe"&gt; &lt;li&gt;Visible 1&lt;/li&gt; &lt;li style="display:none;"&gt;Visible 2&lt;/li&gt; &lt;li style="display:none;"&gt;Visible 3&lt;/li&gt; &lt;li&gt;Visible 4&lt;/li&gt; &lt;li style="display:none;"&gt;Visible 5&lt;/li&gt; &lt;li&gt;Visible 6&lt;/li&gt; &lt;li&gt;Visible 7&lt;/li&gt; &lt;/ul&gt; &lt;!-- Only the visible children. --&gt; &lt;li&gt;Visible 1&lt;/li&gt; &lt;li&gt;Visible 4&lt;/li&gt; &lt;li&gt;Visible 6&lt;/li&gt; &lt;li&gt;Visible 7&lt;/li&gt; &lt;!-- The "odd" visible children. --&gt; &lt;li&gt;Visible 1&lt;/li&gt; &lt;li&gt;Visible 6&lt;/li&gt; </code></pre> <p>I came up with two ways. One works, but the other doesn't.</p> <pre><code>// Method one: Returns the odd children whether they are visible or not. :( var listChildren = $$("ul.stripe &gt; li"); var oddChildren = allChildren .findAll(function(el) { return el.visible(); }) .findAll(function(el) { return el.match("li:nth-child(odd)"); }); oddChildren.invoke("addClassName", "odd"); </code></pre> <p>What I am currently doing now is the following:</p> <pre><code>// Method two: grouping! var listChildren = $$("ul.stripe &gt; li"); var oddChildren = listChildren .findAll(function(el) { return el.visible(); }) .eachSlice(2, function(el) { el[0].addClassName("odd"); }); </code></pre> <p>This code seems like it could be improved. Can anyone suggest a better way to accomplish this?</p>
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