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    <p>You want to change the way you determine if the element is <code>checked</code>:</p> <pre><code>$('#additionalDonationCheckbox').click( function() { $(this).is(':checked') ? alert('checked') : alert('unchecked'); } ); </code></pre> <p>Or</p> <pre><code>$('#additionalDonationCheckbox').click( function() { $(this).prop('checked') ? alert('checked') : alert('unchecked'); } ); </code></pre> <p>This is because <code>checked</code> is both a DOM property and a DOM attribute. The difference between them can be important in some situations (like this).</p> <p>The DOM attribute <code>checked</code> refers to the <em>initial</em> state of the checkbox. So if the checkbox was created with <code>checked="checked"</code>, the DOM attribute <code>checked</code> will always return <code>'checked'</code>, even if the checkbox has since been unchecked.</p> <p>The DOM property <code>checked</code> refers to the <em>current</em> state of the checkbox, and behaves like you want it to. It will return whether a checkbox is checked <em>now</em> regardless of whether it was checked when the document was loaded.</p> <p>It's a subtle difference confused by the fact that jQuery is inconsistent on whether <code>$.attr('checked')</code> returns the attribute or property across versions. Details can be found in the <a href="http://api.jquery.com/prop/" rel="nofollow">documentation</a>.</p> <p>This is further confused by <a href="http://bugs.jquery.com/ticket/10278" rel="nofollow">a bug</a> in jquery 1.6.3 and 1.6.4 that returns a stale value for <code>$(checkbox).attr('checked')</code> after <code>$(checkbox).click()</code>.</p> <p>In summary, if you want to be sure you are getting the <em>current</em> state of the checkbox, either use the <code>is(':checked')</code> call or the <code>prop('checked')</code> call.</p>
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    1. POjquery php form validation checkbox
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    1. COyes, this also eliminates unnecessary http requests by validating client side. You should always do basic form validation client side.
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    2. COyep im going to do both.the code above is actually used to display certain fieldsets depending on whether a checkbox is ticked. if javascript is disabled then the fieldsets display automatically without the checkboxes.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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