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    <p>I could make it work but it was not as straightforward as I thought in a firts instance. I think you need to bear on mind a couple of things:</p> <ol> <li><p>If you want to use a restrictive AND condition, then I suggest don´t use the <strong>"data-filter-value"</strong> option. Instead, put your <strong>filter variables as classes</strong>. Then, you will need to fire the isotope function by yourself in the onclick event. This is because otherwise you will fire the "default" isotope function when the user clicks the button and you won´t be able to achieve the restrictive AND mentioned.</p></li> <li><p>In the same direction, you will need to use <strong>new variable names (so new classes) for each combination of nested filter options you are going to work with</strong>. Otherwise, I don´t see other way (at the moment) to get a restrictive AND condition.</p></li> </ol> <p><strong>This concept about restrictive and nonrestrictive AND clauses is like the difference between an outer and an inner join</strong>. It's the concept you should use if you want to handle two filters, one subfilter of the other one. <br> One example would be something like a list of ebooks which could be filtered by brand, an other subfilter based on the different range prices they belong to.</p> <p>I show you below a code example where I implement this idea, it can give you a hint of what i mean:</p> <p>HTML:</p> <pre><code>&lt;!--Filters section --&gt; &lt;div id="filters"&gt; &lt;ul id="optionSet1" class="option-set" data-option-key="filter"&gt; &lt;li&gt;&lt;a id="filter10" href="#filter" class="selected"&gt;Everything&lt;/a&gt;&lt;/li&gt; &lt;c:forEach var="brand" items="${brands}" varStatus="status" &gt; &lt;li&gt;&lt;a id="filter1${status.count}" href="#filter" class='${brand}'&gt;${brand}&lt;/a&gt;&lt;/li&gt; &lt;/c:forEach&gt; &lt;/ul&gt; &lt;ul id="optionSet2" class="option-set" data-option-key="filter"&gt; &lt;li&gt;&lt;a id="filter20" href="#filter" class="selected"&gt;Any Price&lt;/a&gt; &lt;/li&gt; &lt;c:forEach var="brandPrice" items="${brandPrices}" varStatus="status" &gt; &lt;li&gt;&lt;a id="filter2${status.count}" href="#filter" class='${brandPrice}'&gt;${brandPrice}&lt;/a&gt;&lt;/li&gt; &lt;/c:forEach&gt; &lt;/ul&gt; &lt;/div&gt; &lt;!--Elements to filter --&gt; &lt;div id="portfolio-wrapper" class="row"&gt; &lt;c:forEach var="publication" items="${publications}" varStatus="status" &gt; &lt;div class='span4 portfolio-item ${publication.filterOption1} ${publication.filterOption2} ${publication.filterOption3}...'&gt; &lt;!-- filterOption3 would be the combination of filterOption1 and filterOption2, you can make this building a string as the addition of filterOption1 and filterOption2 strings--&gt; &lt;!--Content to display--&gt; &lt;/c:forEach&gt; &lt;/div&gt; </code></pre> <p>javascript:</p> <pre><code>$(function(){ $("a[id^='filter1']").on('click', function() { // alert($(this).attr('class')); // alert($('#optionSet2 .selected').attr('class')); var myclass = $('#optionSet2 .selected').attr('class'); myclass = myclass.replace(' selected',''); myclass = myclass.replace('selected',''); var myclass2 = $(this).attr('class'); myclass2 = myclass2.replace(' selected',''); myclass2 = myclass2.replace('selected',''); if($(myclass=='' &amp;&amp; myclass2==''){ $('#portfolio-wrapper').isotope({ filter: '*'}); }else if(myclass==''){ $('#portfolio-wrapper').isotope({ filter: '.'+ myclass2+'' }); }else if(myclass2==''){ $('#portfolio-wrapper').isotope({ filter: '.'+myclass+'' }); }else{ $('#portfolio-wrapper').isotope({ filter: '.'+myclass2+myclass+''}); } }); $("a[id^='filter2']").on('click', function() { // alert($(this).attr('class')); // alert($('#optionSet1 .selected').attr('class')); var myclass = $('#optionSet1 .selected').attr('class'); myclass = myclass.replace(' selected',''); myclass = myclass.replace('selected',''); var myclass2 = $(this).attr('class'); myclass2 = myclass2.replace(' selected',''); myclass2 = myclass2.replace('selected',''); if(myclass=='' &amp;&amp; myclass2==''){ $('#portfolio-wrapper').isotope({ filter: '*'}); }else if(myclass==''){ $('#portfolio-wrapper').isotope({ filter: '.'+ myclass2+'' }); }else if(myclass2==''){ $('#portfolio-wrapper').isotope({ filter: '.'+myclass+'' }); }else{ $('#portfolio-wrapper').isotope({ filter: '.'+myclass+myclass2+''}); } }); }); </code></pre>
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    1. POIsotope: combination filtering + multiple selection
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    1. COThank you! I posted the question several weeks ago and meanwhile I found another solution. I should have deleted this question as it's not current anymore. But thank you anyways, I'll take a look at your solution too and mybe alter my script again.
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    2. CO@Alani I have the exact same question. I know how to make a multiple checkbox isotope and I can make a combination filter. Now how did you combine these two? It would be nice if you would answer your own question. Thanks!
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    3. CO@LarsKerff I ended up combining filters with multiple dropdowns. But there's no possibility to choose more than one option inside one dropdown, so it's different from checkboxes and probably not what you were looking for. But you can take a look at this demo, maybe it helps anyways: [jfiddle](http://jsfiddle.net/alani/9WRLE/)
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