Patch to the bootstrap datepicker (http://www.eyecon.ro/bootstrap-datepicker/) to allow a new option: setOnHide It defaults to true, but if set to false then the input field will not get a value simply from clicking off of it without actually selecting a date. We have text boxes that need to show a date picker but are optional so we don't want t…

2013.03.09-bootstrap-datepicker-setOnHide.diff

--- js/bootstrap-datepicker.js.orig     2013-03-09 00:59:04.000000000 -0500
+++ js/bootstrap-datepicker.js  2013-03-09 01:23:06.000000000 -0500
@@ -77,6 +77,7 @@
                this.startViewMode = this.viewMode;
                this.weekStart = options.weekStart||this.element.data('date-weekstart')||0;
                this.weekEnd = this.weekStart === 0 ? 6 : this.weekStart - 1;
+               this.setOnHide = options.setOnHide === false ? false : true;
                this.fillDow();
                this.fillMonths();
                this.update();
@@ -112,7 +113,9 @@
                        if (!this.isInput) {
                                $(document).off('mousedown', this.hide);
                        }
-                       this.set();
+                       if (this.setOnHide) {
+                               this.set();
+                       }
                        this.element.trigger({
                                type: 'hide',
                                date: this.date
@@ -155,8 +158,10 @@
                                typeof newDate === 'string' ? newDate : (this.isInput ? this.element.prop('value') : this.element.data('date')),
                                this.format
                        );
-                       this.viewDate = new Date(this.date.getFullYear(), this.date.getMonth(), 1, 0, 0, 0, 0);
-                       this.fill();
+                       if (typeof this.date !== 'undefined') {
+                               this.viewDate = new Date(this.date.getFullYear(), this.date.getMonth(), 1, 0, 0, 0, 0);
+                               this.fill();
+                       }
                },
 
                fillDow: function(){
@@ -376,6 +381,9 @@
                        return {separator: separator, parts: parts};
                },
                parseDate: function(date, format) {
+                       if (typeof date === 'undefined') {
+                               return;
+                       }
                        var parts = date.split(format.separator),
                                date = new Date(),
                                val;