javascript Reservation system, checkin checkout date with already booked date
<p>I am looking for help in coding. I ve a booking system similar to airbnb. My issue is related to booking date. To be more specific i ll give you one example</p>

<p>One appartment  is already booked for those following dates 2 dec 2012 till 5 dec 2012:</p>

<p>if a new customer select the following dates from 4 dec 2012 till the 6 dec 2012, it displayed message saying "those dates are already booked".</p>

<p>But if the customer select dates like those one 1 dec til the 6 dec or 29 nov and 10 dec. The system let the customer proceed like if the dates are availables.</p>

<p>To sum up: i d like to make sure that customer will have the message " those dates are already booked" if the period he selected includes dates that have already been booked.</p>

<p>I am not an expert in coding, not at all. But i am quite sure that the problem comes from the javascript that display available Flats.</p>

<p>I will put the entire Js. </p>

<p>The message " those dates are already booked" corresponds to #book_it_disabled_message.</p>

<p>Thank you in advance for you time and skills.</p>

<pre><code>function check_inputs(b, c, a) {
b = typeof (b) != "undefined" ? b : true;
c = typeof (c) != "undefined" ? c : "checkin";
a = typeof (a) != "undefined" ? a : "checkout";
if (calendar_is_not_set_date(c)) {
    if (b) {
        calendar_show_cal(c)
    }
    return false
}
if (calendar_is_not_set_date(a)) {
    if (b) {
        calendar_show_cal(a)
    }
    return false
}
return true
}

function copy_checkin_checkout_fields() {
var a = check_inputs(false);
if (a) {
    jQuery("#message_checkin").val(jQuery("#checkin").val());
    jQuery("#message_checkout").val(jQuery("#checkout").val());
    jQuery("#message_number_of_guests").val(jQuery("#number_of_guests").val());
    check_availability_of_dates()
}
}

function copy_message_fields_to_book_it() {
jQuery("#checkin").val(jQuery("#message_checkin").val());
jQuery("#checkout").val(jQuery("#message_checkout").val());
jQuery("#number_of_guests").val(jQuery("#message_number_of_guests").val())
}

function refresh_subtotal() {
var a = function (c, e, d) {
        var b;
        if (c.available) {
            jQuery("#book_it_disabled").hide();
            jQuery("#book_it_enabled").show();
            b = jQuery("#price_amount").html(c.price_per_night).data("nightly-price", c.price_per_night);
            jQuery("#service_fee").html(c.service_fee);
            CogzidelRooms.staggered = c.staggered;
            if (CogzidelRooms.staggered === true) {
                if (CogzidelRooms.stayOffered !== 0) {
                    jQuery("#payment_period").hide();
                    jQuery("#per_month").show();
                    CogzidelRooms.$cancellationVal.text(Translations.long_term);
                    jQuery("#includesFees").show();
                    jQuery("#book_it_default").addClass("monthly")
                }
                jQuery("#subtotal_area").hide();
                jQuery("#show_more_subtotal_info").hide();
                jQuery("#price_amount").text(Cogzidel.Utils.decode(c.staggered_price));
                b.data("monthly-price", c.staggered_price);
                CogzidelRooms.hideMonthlyPriceDetails()
            } else {
                if (CogzidelRooms.stayOffered === 2) {
                    jQuery("#per_month").hide();
                    CogzidelRooms.$cancellationVal.text(CogzidelRooms.originalCancellationPolicy);
                    jQuery("#includesFees").hide();
                    jQuery("#book_it_default").removeClass("monthly");
                    jQuery("#payment_period").show()
                }
                jQuery("#subtotal_area ").show();
                jQuery("#subtotal_area").find("p").show();
                jQuery("#show_more_subtotal_info").show();
                jQuery("#subtotal").html(c.total_price);
                jQuery("#payment_period").val("per_night");
                b.removeAttr("data-monthly-price");
                CogzidelRooms.showMonthlyPriceDetails()
            }
            if (c.can_instant_book) {
                Page3.showInstantBookButton()
            } else {
                Page3.showBookItButton()
            }
        } else {
            if (CogzidelRooms.stayOffered === 1) {
                jQuery("#payment_period").hide();
                jQuery("#per_month").show();
                CogzidelRooms.$cancellationVal.text(Translations.long_term);
                jQuery("#includesFees").show();
                CogzidelRooms.hideMonthlyPriceDetails()
            } else {
                jQuery("#book_it_default").removeClass("monthly");
                jQuery("#payment_period").show();
                jQuery("#per_month").hide();
                  CogzidelRooms.$cancellationVal.text(CogzidelRooms.originalCancellationPolicy);
                jQuery("#includesFees").hide();
                jQuery("#price_amount").html(jQuery("#price_amount").data("nightly-price"));
                CogzidelRooms.showMonthlyPriceDetails()
            }
            jQuery("#book_it_disabled_message").html(c.reason_message);
            jQuery("#book_it_enabled").hide();
            jQuery("#book_it_disabled").show();
            jQuery("#show_more_subtotal_info").hide()
        }
        jQuery("#book_it_status").pulsate(1, 600)
    };
jQuery("#book_it_button").removeAttr("disabled");
jQuery("#subtotal_area").find("p").hide();
jQuery("#subtotal_area").show();
if (calendar_is_not_set_date("checkin") || calendar_is_not_set_date("checkout")) {
    a = function () {};
    jQuery("#book_it_disabled").hide();
    jQuery("#book_it_enabled").show();
    jQuery("#subtotal_area").hide();
    jQuery("#show_more_subtotal_info").hide()
} else {
    jQuery("#subtotal, #book_it_disabled_message").html('&lt;img src="'+base_url+'images/spinner.gif" alt="" height="16" width="16" /&gt;')
}
jQuery.getJSON(base_url+"rooms/ajax_refresh_subtotal", jQuery("#book_it_form").serialize(), a)
 }
</code></pre>
