jQuery :checkbox Selector
Learn all about the jQuery function :checkbox Selector.
$( ":checkbox" ) is equivalent to
$( "[type=checkbox]" ). As with other pseudo-class selectors (those that begin with a ":") it is recommended to precede it with a tag name or some other selector; otherwise, the universal selector ("*") is implied. In other words, the bare
$(':checkbox') is equivalent to
$( "*:checkbox" ), so
$( "input:checkbox" ) should be used instead.