javascript - Create array of available time slots between two dates -

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i weak on front end work , need little here.

i developing basic form gives users available schedule options booking appointment during next 3 days inclusive.

so have far written:

    var today = new date();      var lastday = new date(today);     lastday.setdate(today.getdate() + 4);      var daterange = getalldays(today, lastday);      function getalldays(today, lastday)     {         var s = new date(today);         var e = new date(lastday);         var = [];           //this gets start time days         while (s < e)         {              //if day saturday hours change             if(s.getday() == 0)             {                 //if sunday skip             }             else if (s.getday() == 6)             {                 //push start onto array                 a.push(setworkinghours(s, '10'));                  //push end onto array                 a.push(setworkinghours(s, '20'));             }             else             {                 //push start onto array                 a.push(setworkinghours(s, '13'));                  //push end onto array                 a.push(setworkinghours(s, '20'));             }               s = new date(s.setdate(s.getdate() + 1))          }          return a;      };       function setworkinghours(date, hour)     {         var datetime = new date();         datetime.setdate(date.getdate());         datetime.sethours(hour, '0', '0');          return datetime;     }   alert(daterange.join('\n'));

here fiddle.

now know use refinement , open improvements.

so above code gets me array of days start , stop time. i'm struggling figure out how going array of hours within each days start , stop time.

further once have hours have query google calendar returns events parse array.

upcoming events: bob builder (2015-08-07t10:00:00-08:00) john doe (2015-08-08t11:00:00-08:00) mary jane (2015-08-10t18:00:00-08:00)

finally need "intersect" available array booked array , return left.

as appointments themselves. if person picked time schedule 2 hour block. appointments can start @ top or bottom of hour.

i use along lines of gettimeslotsforday function below array of available start times given day.

var googlecalenderappointments = null;  var today = new date();  var lastday = new date(today);  lastday.setdate(today.getdate() + 4);    function checkgooglecalendarconflict(date) {    var hasconflict = false;    if (!googlecalenderappointments) {      //logic scheduled appointments    }      //iterate through relevant scheduled appointments    //if argument `date` has conflict, return true    //else, return false      return hasconflict  }    function gettimeslotsforday(date) {    var timeslots = []    var daystart = new date(date)    var dayend = new date(date)      switch (date.getday()) {      case 0: //sunday        return timeslots;      case 6: //saturday        daystart.sethours(10, 0, 0, 0)        dayend.sethours(20, 0, 0, 0)        break;      default:        daystart.sethours(13, 0, 0, 0)        dayend.sethours(20, 0, 0, 0)    }    {      if (!checkgooglecalendarconflict(daystart)) {        timeslots.push(new date(daystart))      }      daystart.sethours(daystart.gethours(), daystart.getminutes() + 30)    } while (daystart < dayend);      return timeslots  }    var message = ""  (var = new date(today); < lastday; i.setdate(i.getdate() + 1)) {    message += i.todatestring() + ":\n"    message += gettimeslotsforday(i).map(function(it) {      return it.totimestring();    }).join(",\n") + "\n";  }  alert(message)


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