Answers for "if checkbox value is true then jquery"

jquery if checkbox checked

$( "SELECTOR" ).attr( "checked" )  // Returns ‘true’ if present on the element, returns undefined if not present
$( "SELECTOR" ).prop( "checked" ) // Returns true if checked, false if unchecked.
$( "SELECTOR" ).is( ":checked" ) // Returns true if checked, false if unchecked.

if checkbox checked jquery value 1

var checked = '0';  if($('#checkbox').prop('checked')){ checked = '1'; }