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    <p>You can attach an event to each first checkbox of divs of class1 by using something like:</p> <pre><code> $('.class1 input:first-child').live('change', function () { </code></pre> <p>(I've used change instead of click because it's a bit more generic. ) Only attaching the first element and not the entire div makes sure you only react when needed.</p> <p>Futher the disabling as you have used it should work, but siblings will only work if your first checkbox is not nested inside another element (e.g. a Paragraph)</p> <p>Example fiddle: <a href="http://jsfiddle.net/Zqz63/" rel="nofollow">http://jsfiddle.net/Zqz63/</a></p> <p><strong>edit</strong> Seeing the html in your updated post , siblings will indeed not work, you could look up in the parents chain to find the .elements div and look down for there for checkboxes (other than the selected)</p> <pre><code> var n = $(this).parents('.elements').find('input:checkbox').not(this); </code></pre> <p>jsfiddle is unresponsive, so I've moved the sample to jsbin: <a href="http://jsbin.com/ahemet/3/edit" rel="nofollow">http://jsbin.com/ahemet/3/edit</a> (NB, in the current jsbin version there is no proper selection of only the first checkbox, so the event will also fire on the 2nd checkbox, but I reckoned that was outside the scope of your question)</p> <p><strong>edit 2</strong> Using the information that class1 is always the first checkbox and class2 always the second:</p> <pre><code>$('input:checkbox.class1').live('change', function () { var n = $(this).parents('.elements').first().find('input:checkbox.class2'); if ($(this).attr('checked')) { n.attr('checked',true); n.attr('disabled', true); } else { n.attr('disabled',false); } }); </code></pre> <p>test: <a href="http://jsbin.com/ahemet/4/edit" rel="nofollow">http://jsbin.com/ahemet/4/edit</a></p>
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    1. COThe `.class1` element **is** the checkbox, so the event handler should only apply to that one element.
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    2. COThe only problem is that also other checkboxes in div 'elements' are disabled. How could I disable and check only the second when the first is checked?
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    3. CO@Anthony Absolutely true, if the use case is such that it applies only to .class1 checkboxes the OP could use $('input:checkbox.class1').live('change',... But the original text states multiple divs with 2 checkboxes, so the example reoccurs, but I'm not sure whether they'll be class1 based on the information.
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