Month UNDEFINED if shortcuts and monthSelect are enabled

[XavierCLL]

The month showed as UNDEFINED if shortcuts and monthSelect are enabled:

Config:

{
       shortcuts :
            {
                'prev-days': [1,3,5,7],
                'prev': ['week','month','year'],
                'next-days':null,
                'next':null
            },
        monthSelect: true,
	yearSelect: true,
}

Using jquery-date-range-picker v 0.16.1

[kl23]

I changed a little bit as a workaround, there should be a mutator that update both of the 2 months instead of just modifying this function because it updates without this function in elsewhere. And some of the updates rendered the calendar more than once.

function redrawDatePicker() {
    var _endDate = new Date(opt.endDate.valueOf());
    _endDate.setHours(0,0,0,0);
    _endDate.setDate(0);
    _endDate.setMilliseconds(-1);
    if (opt.month1 > _endDate) {
        showMonth(_endDate, 'month1');
        showMonth(nextMonth(_endDate), 'month2');
    } else {
        showMonth(opt.month1, 'month1');
        showMonth(opt.month2, 'month2');
    }
}

[XavierCLL]

Hi @kl23 , I tried with your changes and the issue is still present, I forgot to say that the error is showing when you pick the shortcuts.

[kl23]

Thanks for your reply, @XavierCLL . I in fact encountered the same problem by clicking a date range in the same month and the range is in the maximum month (i.e. endDate). As mentioned in the above comment, it updates (renders UI) without this function in elsewhere (not just redrawDatePicker).

The UNDEFINED string is generated here since isCurrent is never true:

jquery-date-range-picker/src/jquery.daterangepicker.js

Lines 2018 to 2028 in 23cbf1f

	for (var i = 0, l = data.length; i < l; i++) {
	select += '<option value="' + data[i].value + '"' + (data[i].isCurrent ? ' selected' : '') + '>';
	select += data[i].text;
	select += '</option>';
	if (data[i].isCurrent) {
	current = data[i].text;
	}
	}
	select += '</select>' + current + '</div>';

and it loops through the input from range created in generateMonthElement() (line 2003). The range depends on the first parameter in showMonth() and is limited by the maximum date that you can choose, thereby the list will not include Apr in case max date is Mar. But sorry, I don't understand how range is generated, you may take a look here:

jquery-date-range-picker/src/jquery.daterangepicker.js

Lines 1945 to 1963 in 23cbf1f

	function generateMonthElement(date, month) {
	var range;
	var startDate = opt.startDate ? moment(opt.startDate).add(!opt.singleMonth && month === 'month2' ? 1 : 0, 'month') : false;
	var endDate = opt.endDate ? moment(opt.endDate).add(!opt.singleMonth && month === 'month1' ? -1 : 0, 'month') : false;
	date = moment(date);
	if (!opt.monthSelect ||
	startDate && endDate && startDate.isSame(endDate, 'month')) {
	return '<div class="month-element">' + nameMonth(date.get('month')) + '</div>';
	}
	range = [
	startDate && date.isSame(startDate, 'year') ? startDate.get('month') : 0,
	endDate && date.isSame(endDate, 'year') ? endDate.get('month') : 11
	];
	if (range[0] === range[1]) {
	return '<div class="month-element">' + nameMonth(date.get('month')) + '</div>';
	}

The problem is: showMonth() is used everywhere in the source code. And it fails to create a correct range when the selected start date is in the same month of endDate.

The code changed in above comment shifted the pair of months to left (month -= 1) so that (1) the selected date range are on the right, (2) maximum date is either on the right or in the next page of right month. You may try to apply this logic to where it triggers showMonth().

[wakirin]

https://jsfiddle.net/63ks4vbo/3/

I don't see that problem, can you show your trouble on jsfiddle ?

[yphoenix]

I can't see an issue either. I updated the fiddle to include a moment.js library.
I did purposely include v2.9 as the docs state that we only need 2.8.1, whereas in reality we need to either fix #421 or update the docs to require 2.12.

https://jsfiddle.net/63ks4vbo/7/

[wakirin]

ok, thanks. I guess better update docs.

[XavierCLL]

Hi @wakirin and @yphoenix you are right I forget the jsfiddle for to show the error, please go to:

https://jsfiddle.net/tuteq2ae/1/

And click on a shortcut 1day or 3days

[XavierCLL]

maybe this bug is related with moment() library because if you delete the line of endDate the error disappears, the #421 fix that?

[wakirin]

Found problem in function generateMonthElement

jquery-date-range-picker/src/jquery.daterangepicker.js

Line 1958 in 766ea70

endDate && date.isSame(endDate, 'year') ? endDate.get('month') : 11

I have replaced endDate.get('month') to date.get('month'), and now it's show month names.

jsfiddle with updated jquery.daterangepicker.js
https://jsfiddle.net/tuteq2ae/5/

[XavierCLL]

Yeah @wakirin with your changes this issue is fixed, thank you! please do the PR

[holtkamp]

Released in https://github.com/longbill/jquery-date-range-picker/releases/tag/0.16.3

[monovertex]

I'm re-opening this issue, because the fix presented here breaks the month dropdown. See #452.

The issue is a bit more involved. The problem is that the select builder depends on the range constructed in generateMonthElement to extract the current month, but it should be completely independent instead. So the initial range building was good, it's just the select builder that is broken.

I will open a PR with a more robust fix soon.