Moves the placeholder of an input to a different position as soon as at least one character is entered.
/* MOVE LABEL ON INPUT
/----------------------------*/
$('input.checkout').on('keyup', function() {
var name = $(this).attr("name");
var value = $(this).val();
if (value.length) {
$("label[for=" + name + "]").addClass('phlabel');
} else {
$("label[for=" + name + "]").removeClass('phlabel');
}
});