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    Starting jquery 1.6 there have been significant changes the way attributes and properties are dealt with. For your case following should work: if($('#isAgeSelected').prop("checked")) { $("#txtAge").show(); } else { $("#txtAge").hide(); } The condition in if statement will simply return true or false depending upon the checked/unchecked state of the check box. For more details refer to attributes vs. properties section on this link.
    – RBT
    Commented Feb 12, 2016 at 18:44
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    Does this answer your question? How can I check if a checkbox is checked?
    – Liam
    Commented May 13, 2022 at 13:51