jQuery UI Picking a start and end date within range based on start date

Question

I\'m building a date picker in jQuery ui. What I\'m trying to do is set a range, so when they pick the first date the second date appears and gives a 30 day window. I tried this

Answer 1

$("#start_date").datepicker().on('changeDate', function(selected){
        startDate = new Date(selected.date.valueOf());
        $('#end_date').datepicker('setStartDate', startDate);
    });  

    $("#end_date").datepicker().on('changeDate', function(selected){
        startDate = new Date(selected.date.valueOf());
        $('#start_date').datepicker('setEndDate', startDate);
    });

Answer 2

Check this jsfiddle here. It's a working example of your problem.

HTML

<input type="text" id="dt1">
<input type="text" id="dt2">

JS

$(document).ready(function () {
    $("#dt1").datepicker({
        dateFormat: "dd-M-yy",
        minDate: 0,
        onSelect: function () {
            var dt2 = $('#dt2');
            var startDate = $(this).datepicker('getDate');
            //add 30 days to selected date
            startDate.setDate(startDate.getDate() + 30);
            var minDate = $(this).datepicker('getDate');
            var dt2Date = dt2.datepicker('getDate');
            //difference in days. 86400 seconds in day, 1000 ms in second
            var dateDiff = (dt2Date - minDate)/(86400 * 1000);

            //dt2 not set or dt1 date is greater than dt2 date
            if (dt2Date == null || dateDiff < 0) {
                    dt2.datepicker('setDate', minDate);
            }
            //dt1 date is 30 days under dt2 date
            else if (dateDiff > 30){
                    dt2.datepicker('setDate', startDate);
            }
            //sets dt2 maxDate to the last day of 30 days window
            dt2.datepicker('option', 'maxDate', startDate);
            //first day which can be selected in dt2 is selected date in dt1
            dt2.datepicker('option', 'minDate', minDate);
        }
    });
    $('#dt2').datepicker({
        dateFormat: "dd-M-yy",
        minDate: 0
    });
});

As soderslatt already mentioned use the onSelect option to set the dates. Other methods I used are:

• getDate
• setDate
• minDate
• maxDate

I think they're all very self explanatory and the documentation helps you to understand how they work. If you want to set the date of the second datepicker to dt1's date + 1 day do the same as in this line:

startDate.setDate(startDate.getDate() + 30);

But of course add 1 day and not 30.

Answer 3

Try using the ui onSelect callback instead of .change(), http://api.jqueryui.com/datepicker/#option-onSelect

on init:

var $datepickerStart = $("#datepickerStart");
$datepickerStart.datepicker({
    onSelect: function( selectedDate ) {
        $datepickerStart.datepicker( "option", "minDate", selectedDate );
    }
});