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How do I determine the state of a toggled element?
jQuery Interview Questions and Answers
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How do I determine the state of a toggled element?
You can determine whether an element is collapsed or not by using the :visible and :hidden selectors.
var isVisible = $('#myDiv').is(':visible');
var isHidden = $('#myDiv').is(':hidden');
If you're simply acting on an element based on its visibility, just include ":visible" or ":hidden" in the selector expression. For example:
$('#myDiv:visible').animate({left: '+=200px'}, 'slow');
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