问如何防止选择中间有禁用日期的日期范围？

EN

function validateDateRange() {

    var txtStartDate = $("#start_date");
    var txtEndDate = $("#end_date");
    var startDate;
    var endDate;
    var tempDate;

    if (txtStartDate.val() == "") 
        return false;

    if (txtEndDate.val() == "") 
        return false;

    startDate = new Date(txtStartDate.val());
    endDate = new Date(txtEndDate.val());

    for (i = 0; i < unavailableDates.length; i++) {
        var temp = unavailableDates[i].split("-");

        tempDate = new Date(temp[2], temp[1]-1, temp[0]);

        if (startDate < tempDate && endDate > tempDate) {
            alert("Invalid Date Range");
            return false;
        }
    }
}

   $('#start_date').datepicker(
   {
       beforeShow: customRangeStart,
       beforeShowDay: unavailable,
       minDate: 0,
       dateFormat: "yy-mm-dd",
       changeYear: true,
       onSelect: function() {
           //Do validation functionality here
           triggerOnStartSelect();
        }
   });

//Trigger upon change event of either start or end date
function triggerOnStartSelect(){
    var startDate = new Date($("#start_date").datepicker("getDate"));
    var endDate = new Date($("#end_date").datepicker("getDate"));    
    //if required you could reset all of the default setting here //
    //And can also validate the date objects 

    //Holds to be set maxdate of end_date datepicker
    var tempEndDate= null ;
    //unavailableDateObjects : Array of date objects listed as disabled
      $.each(unavailableDateObjects, function(i, disabledRangeDate) {
       if (startDate < disabledRangeDate) {
           tempEndDate=new Date(disabledRangeDate);
           //subtracts one day from the nearest disabled range date 
           tempEndDate.setDate(tempEndDate.getDate() - 1);
           return false;
        }
    }); 
    //Sets maxDate to the closest disabled date range or null . if null denotes no maxdate.
    $( "#end_date" ).datepicker( "option", "maxDate", tempEndDate);
}

var unavailableDates = ["31-5-2014", "1-6-2014", "2-6-2014", "3-6-2014"];

//Convert String Date List to Date object List
function convertDisabledFieldToDateObject(diabledList) {
    var dateList = [];
    $.each(diabledList, function (i, singleDate) {
       var parsedDate = $.datepicker.parseDate("dd-mm-yy",singleDate);
        dateList.push(parsedDate);
    });
    //Sort date if the diabled date sets are in jumbled order
    dateList.sort(function(date1, date2){
    return date1 - date2;
      });
    return dateList;
}

    var StartDate = $("#start_date").val();
    var EndDates = $("#end_date").val();
    var selectedDate = $("#selected_date").val();

    //-- Start Date Convert in YMD 
    var Sdate = StartDate.split("-");
    var Syear= Sdate[2];
    var Smonth= Sdate[1];
    var Sday= Sdate[0];
    var SYMDDate = Syear + '-' + Smonth + '-' + Sday;
    var newdate= new Date(SYMDDate);
    var StartDateStrToTime=newdate.getTime();

    //-- End Date Convert in YMD
    var Edate = EndDates.split("-");
    var Eyear= Edate[2];
    var Emonth= Edate[1];
    var Eday= Edate[0];
    var EYMDDate = Eyear + '-' + Emonth + '-' + Eday;
    var newdates= new Date(EYMDDate);
    var EndDateStrToTime=newdates.getTime();

    //-- Selected Date Convert in YMD
    var Cdate = selectedDate.split("-");
    var Cyear= Cdate[2];
    var Cmonth= Cdate[1];
    var Cday= Cdate[0];
    var CYMDDate = Cyear + '-' + Cmonth + '-' + Cday;
    var newdateses= new Date(CYMDDate);
    var SelectedDateStrToTime=newdateses.getTime();

    if((SelectedDateStrToTime>=StartDateStrToTime) && (SelectedDateStrToTime<=EndDateStrToTime))
    {}
    else
    {
        alert("Please Select date between "+StartDate+" to " +EndDates+".");
        $("#selected_date").val(EndDates);
    }