Answers for "javascript button attr disabled false not working"

jquery disable button

$('.class').prop("disabled", true);
$('#id').prop("disabled", true);

// As function
const disable = (id) => $(`#${id}`).prop("disabled", true);

jquery enable submit button

//jQuery 1.6+ use:
$("#submitButtonID").prop('disabled', true); //disable 
$("#submitButtonID").prop('disabled', false); //enable

//jQuery 1.5 and below use:
$("#submitButtonID").attr('disabled','disabled'); //disable 
$("#submitButtonID").removeAttr('disabled'); //enable