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    <p>If you're using jQuery, just use a selector instead of <code>getElementById()</code> and use <code>append()</code> to add content to it.</p> <p>Also, you should never have two items with the same ID. You can sort it out by appending your <code>famElements</code> counter to the IDs of your input fields. As this change ruled out selecting the elements by ID, I also changed your checkboxes to have a class <code>cit</code>, so I can attach the event using an easy selector.</p> <p>For the click event, you can use <a href="http://api.jquery.com/live/" rel="nofollow"><code>.live()</code></a> or <a href="http://api.jquery.com/delegate/" rel="nofollow"><code>.delegate()</code></a> so you don't have to keep binding events all the time.</p> <pre><code>function familySize() { while (famElements &lt; $("#famNum").val()) { // add fields famElements++; addFields = '&lt;div class="member"&gt; Name:&amp;nbsp;&lt;input id="name'+famElements+'" type="text" placeholder="Name" required&gt; &amp;nbsp;&amp;nbsp;&lt;input class="cit" id="cit'+famElements+'" type="checkbox" onChange="citizenInfo()" &gt;&amp;nbsp;&amp;nbsp;Non U.S. Citizen?&lt;br/&gt;&lt;/div&gt; &lt;div class="citInfo" style="display:none"&gt; &lt;input id="countryCitizenship'+famElements+'" type="text" placeholder="Citizenship" required&gt;&lt;/div&gt;'; $('#famItems').append(addFields); } while (famElements &gt; $("#famNum").val()) { // remove fields console.log("remove one"); $('#famItems div:last').remove(); famElements--; } } // Your jQuery ready function $(function(){ // Click event on checkboxes $('#famItems').delegate('.cit','click',function(){ var $this = $(this); // Show or hide the div if($this.is(':checked')){ $this.parent().find('.citInfo').hide(); } else { $this.parent().find('.citInfo').show(); } }); }); </code></pre> <p>You can build your elements more elegantly with jQuery, but it does what it needs to do. Although you might consider doing that in case you add to your HTML and that big lump of text becomes too much of a mystery.</p>
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    1. POshow/hide dynamically added divs using jQuery
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    1. COHey thanks for the quick reply. I tried this code though and it doesn't seem to work. The $funcion() gets called on start up but since the familySize() is called when the combobox is changed, the checkbox handler never gets called. How do I associate this function with the checkboxes.
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    2. CO@solerous: I admit this code is completely untested. The `delegate()` binds the event handler against your container div `#famItems`, so as long as that exists at the time of document ready and it's never destroyed, it should work. Please note that because of the ID fix, I have added a `cit` class on your checkboxes to make the selector easier, make sure you put it on them too when testing.
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    3. COWell, #famItems will exist but the cit divs will not. Can it bind to clicks on undefined items?
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