Answers for "jquery get value of checkbox if checked"

jquery checkbox checked value

if ($('#check_id').is(":checked"))
{
  // it is checked
}

how get checkbox if checked in jquery

if($("#rule").is(":checked")){
    $("#form").submit();
 }

how do i check if JQuery checkbox is checked

$('#isAgeSelected').click(function() {
    $("#txtAge").toggle(this.checked);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js">
  </script>
<input type="checkbox" id="isAgeSelected"/>
<div id="txtAge" style="display:none">Age is something</div>