javascript - Update departure date if arrival date is greater -

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i want update departure-date in calendar when arrival-date greater, using javascript, adding 1 day. code problem when change arrival-date, departure-date remains same. 

function adddate() {  			date = new date();  			var month = date.getmonth() + 1;  			var day = date.getdate();  			var year = date.getfullyear();    			if (document.getelementbyid('startdate').value == '') {  				document.getelementbyid('startdate').value = month + '/' + day + '/' + year;  			}  			if (document.getelementbyid('enddate').value == '') {  				document.getelementbyid('enddate').value = month + '/' + (day + 1) + '/' + year;  			}  		}
<input type="text" id="startdate" style="background-color:#5c677b;height:25px;" name="checkin" placeholder="checkin">    <input type="text" id="enddate" style="background-color:#5c677b;height:25px;" name="checkout" placeholder="checkout">

if got right, want to:

  • set default current date arrival date , next day departure date
  • update departure date when changing arrival date if that's greater

my solution this. firstly have catch event, putting onchange="changeddate()". check if arrivaldate>departuredate , when true date , update departure date next one.

adddate();  function adddate() {    date = new date();    var month = date.getmonth() + 1;    var day = date.getdate();    var year = date.getfullyear();      if (document.getelementbyid('startdate').value == '') {      document.getelementbyid('startdate').value = month + '/' + day + '/' + year;    }    if (document.getelementbyid('enddate').value == '') {      document.getelementbyid('enddate').value = month + '/' + (day + 1) + '/' + year;    }  }  function changeddate(){    var arrivaldate = new date(document.getelementbyid('startdate').value) ;    var departuredate = new date(document.getelementbyid('enddate').value) ;    if(arrivaldate>departuredate){      var arrdate = new date();      arrdate.setdate(arrivaldate.getdate()+1);      arrdate.setmonth(arrivaldate.getmonth()+1);      arrdate.setfullyear(arrivaldate.getfullyear());      document.getelementbyid('enddate').value = arrdate.getmonth() + '/' + arrdate.getdate() + '/' + arrdate.getfullyear();    }  }
<input type="text" id="startdate" style="background-color:#5c677b;height:25px;" name="checkin" placeholder="checkin" onchange="changeddate()">  <input type="text" id="enddate" style="background-color:#5c677b;height:25px;" name="checkout" placeholder="checkout">


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