Created jsfiddle for my issue http://jsfiddle.net/sudiptabanerjee/93eTU/
In modal window issue is on Change Month and Change Year combos.
a) IE 11: everythin
This is because the modal enforces focus on itself. Here is a solution for this as mentioned here . Add the below script to your js file. That's it.
Working Demo
jQuery
// Since confModal is essentially a nested modal it's enforceFocus method
// must be no-op'd or the following error results
// "Uncaught RangeError: Maximum call stack size exceeded"
// But then when the nested modal is hidden we reset modal.enforceFocus
var enforceModalFocusFn = $.fn.modal.Constructor.prototype.enforceFocus;
$.fn.modal.Constructor.prototype.enforceFocus = function() {};
$confModal.on('hidden', function() {
$.fn.modal.Constructor.prototype.enforceFocus = enforceModalFocusFn;
});
$confModal.modal({ backdrop : false });
For Bootstrap 4:
replace : $.fn.modal.Constructor.prototype.enforceFocus
By: $.fn.modal.Constructor.prototype._enforceFocus