Explain why the design feature of the product is important to users or humans in terms of user performance and satisfaction.

return num;
}

function checkSubmit()
{
if ($('#deadline_reason option:selected').val() != 0)
{
$('#ext-deadline').show();
} else {
$('#ext-deadline').hide();
}
}

$(function() {
$( ".datepicker" ).datepicker({
showOn: "button",
buttonImage: "/res/img/wr/calendar.png",
buttonImageOnly: true,
dateFormat : 'dd/mm/yy',
maxDate: '+2m',
minDate: new Date(2015, 12 – 1, 11),
onSelect: function(dateText) {
$('#new_deadline').text(dateText.split('/')[0]+'/'+dateText.split('/')[1]+'/'+dateText.split('/')[2]);
}
});

$('.time_input').click(function(){
switch (true)
{
case $(this).hasClass('ti_hour_plus'):
$('#rd_hour').text(parseInt($('#rd_hour').text(), 10) 0 ? fixTimeZero(parseInt($(‘#rd_hour’).text(), 10) – 1) : $(‘#rd_hour’).text());
break;
case $(this).hasClass(‘ti_min_plus’):
$(‘#rd_minutes’).text(parseInt($(‘#rd_minutes’).text(), 10) 0 ? fixTimeZero(parseInt($(‘#rd_minutes’).text(), 10) – 1) : $(‘#rd_minutes’).text());
break;
}
})

$(‘#ext-deadline’).click(function(e){
e.preventDefault();
var new_deadline = $(‘#new_deadline’).text();

deadline = (new_deadline.split(‘/’)[2]).toString() + ‘-‘ +
(new_deadline.split(‘/’)[1]).toString() + ‘-‘ +
(new_deadline.split(‘/’)[0]).toString() + ‘ ‘ +
($(‘#rd_hour’).text()).toString() + ‘:’ +
($(‘#rd_minutes’).text()).toString() + ‘:00’;

reason_id = $(‘#deadline_reason option:selected’).val();

$.ajax({
url : ‘/sys/orders/view.extdeadline/’ + order_id,
data : {ext_deadline : deadline, reason_id : reason_id},
type : ‘post’,
dataType: ‘json’,
success : function(data){
$(‘.deadline_ext_error, .deadline_ext_msg’).empty();
if(data.result == 0) {
$(‘.deadline_ext_error’).html(data.message).show();;
} else {
$(‘.deadline_ext_msg’).html(data.message).show();
}
}
})
})
});
// ]]>