Merge branch 'safari-is-baNaNas' into 'master'

Fix Safari displaying NaN for selected due date

## What does this MR do?

1. Stops using `Date.parse` to parse selected due dates.
2. Refactors DueDateSelectors to be more maintainable and readable

## Are there points in the code the reviewer needs to double check?

**To review the actual fix, look here:** https://gitlab.com/gitlab-org/gitlab-ce/commit/4ad43ac3a12902d7ea01dc09f8a361b01c21a0ee. It would be difficult to pick out from the overall diff.

## Why was this MR needed?

In Safari, the due date selector was displaying 'NaN' when a date is selected, which was being returned by `Date.parse`. Because `Date.parse` is implemented differently across browsers it's generally recommended to favor implicit Date parsing with the `Date` constructor. For more background on this, [see MDN on Date.parse](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date/parse).

Also, the code for DueDateSelector was pretty messy, and its logic was very tightly coupled, so I refactored it. None of the basic logic changed, I just broke it up into smaller pieces and made it more OO.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/22984

See merge request !6797

Signed-off-by: Rémy Coutable <remy@rymai.me>

5 files changed, 164 insertions, 109 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 7abf3bed61b..e4b28d3722f 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -5,6 +5,7 @@ v 8.12.7
   - Fix Long commit messages overflow viewport in file tree. !6573
   - Use gitlab-markup gem instead of github-markup to fix `.rst` file rendering. !6659
   - Prevent flash alert text from being obscured when container is fluid. !6694
+  - Fix due date being displayed as NaN in Safari. !6797
   - Fix JS bug with select2 because of missing `data-field` attribute in select box. !6812
   - Do not alter 'force_remove_source_branch' options on MergeRequest unless specified. !6817
   - Fix GFM autocomplete setup being called several times. !6840
diff --git a/app/assets/javascripts/dispatcher.js b/app/assets/javascripts/dispatcher.js
index ddf11ecf34c..8fe909abc0e 100644
--- a/app/assets/javascripts/dispatcher.js
+++ b/app/assets/javascripts/dispatcher.js
@@ -45,7 +45,7 @@
         case 'projects:milestones:new':
         case 'projects:milestones:edit':
           new ZenMode();
-          new DueDateSelect();
+          new gl.DueDateSelectors();
           new GLForm($('.milestone-form'));
           break;
         case 'groups:milestones:new':
diff --git a/app/assets/javascripts/due_date_select.js b/app/assets/javascripts/due_date_select.js
deleted file mode 100644
index bf68b7e3a9b..00000000000
--- a/app/assets/javascripts/due_date_select.js
+++ /dev/null
@@ -1,107 +0,0 @@
-(function() {
-  this.DueDateSelect = (function() {
-    function DueDateSelect() {
-      var $datePicker, $dueDate, $loading;
-      // Milestone edit/new form
-      $datePicker = $('.datepicker');
-      if ($datePicker.length) {
-        $dueDate = $('#milestone_due_date');
-        $datePicker.datepicker({
-          dateFormat: 'yy-mm-dd',
-          onSelect: function(dateText, inst) {
-            return $dueDate.val(dateText);
-          }
-        }).datepicker('setDate', $.datepicker.parseDate('yy-mm-dd', $dueDate.val()));
-      }
-      $('.js-clear-due-date').on('click', function(e) {
-        e.preventDefault();
-        return $.datepicker._clearDate($datePicker);
-      });
-      // Issuable sidebar
-      $loading = $('.js-issuable-update .due_date').find('.block-loading').hide();
-      $('.js-due-date-select').each(function(i, dropdown) {
-        var $block, $dropdown, $dropdownParent, $selectbox, $sidebarValue, $value, $valueContent, abilityName, addDueDate, fieldName, issueUpdateURL;
-        $dropdown = $(dropdown);
-        $dropdownParent = $dropdown.closest('.dropdown');
-        $datePicker = $dropdownParent.find('.js-due-date-calendar');
-        $block = $dropdown.closest('.block');
-        $selectbox = $dropdown.closest('.selectbox');
-        $value = $block.find('.value');
-        $valueContent = $block.find('.value-content');
-        $sidebarValue = $('.js-due-date-sidebar-value', $block);
-        fieldName = $dropdown.data('field-name');
-        abilityName = $dropdown.data('ability-name');
-        issueUpdateURL = $dropdown.data('issue-update');
-        $dropdown.glDropdown({
-          hidden: function() {
-            $selectbox.hide();
-            return $value.css('display', '');
-          }
-        });
-        addDueDate = function(isDropdown) {
-          var data, date, mediumDate, value;
-          // Create the post date
-          value = $("input[name='" + fieldName + "']").val();
-          if (value !== '') {
-            date = new Date(value.replace(new RegExp('-', 'g'), ','));
-            mediumDate = $.datepicker.formatDate('M d, yy', date);
-          } else {
-            mediumDate = 'No due date';
-          }
-          data = {};
-          data[abilityName] = {};
-          data[abilityName].due_date = value;
-          return $.ajax({
-            type: 'PUT',
-            url: issueUpdateURL,
-            data: data,
-            dataType: 'json',
-            beforeSend: function() {
-              var cssClass;
-              $loading.fadeIn();
-              if (isDropdown) {
-                $dropdown.trigger('loading.gl.dropdown');
-                $selectbox.hide();
-              }
-              $value.css('display', '');
-              cssClass = Date.parse(mediumDate) ? 'bold' : 'no-value';
-              $valueContent.html("<span class='" + cssClass + "'>" + mediumDate + "</span>");
-              $sidebarValue.html(mediumDate);
-              if (value !== '') {
-                return $('.js-remove-due-date-holder').removeClass('hidden');
-              } else {
-                return $('.js-remove-due-date-holder').addClass('hidden');
-              }
-            }
-          }).done(function(data) {
-            if (isDropdown) {
-              $dropdown.trigger('loaded.gl.dropdown');
-              $dropdown.dropdown('toggle');
-            }
-            return $loading.fadeOut();
-          });
-        };
-        $block.on('click', '.js-remove-due-date', function(e) {
-          e.preventDefault();
-          $("input[name='" + fieldName + "']").val('');
-          return addDueDate(false);
-        });
-        return $datePicker.datepicker({
-          dateFormat: 'yy-mm-dd',
-          defaultDate: $("input[name='" + fieldName + "']").val(),
-          altField: "input[name='" + fieldName + "']",
-          onSelect: function() {
-            return addDueDate(true);
-          }
-        });
-      });
-      $(document).off('click', '.ui-datepicker-header a').on('click', '.ui-datepicker-header a', function(e) {
-        return e.stopImmediatePropagation();
-      });
-    }
-
-    return DueDateSelect;
-
-  })();
-
-}).call(this);
diff --git a/app/assets/javascripts/due_date_select.js.es6 b/app/assets/javascripts/due_date_select.js.es6
new file mode 100644
index 00000000000..41925fcc8e3
--- /dev/null
+++ b/app/assets/javascripts/due_date_select.js.es6
@@ -0,0 +1,161 @@
+(function(global) {
+  class DueDateSelect {
+    constructor({ $dropdown, $loading } = {}) {
+      const $dropdownParent = $dropdown.closest('.dropdown');
+      const $block = $dropdown.closest('.block');
+      this.$loading = $loading;
+      this.$dropdown = $dropdown;
+      this.$dropdownParent = $dropdownParent;
+      this.$datePicker = $dropdownParent.find('.js-due-date-calendar');
+      this.$block = $block;
+      this.$selectbox = $dropdown.closest('.selectbox');
+      this.$value = $block.find('.value');
+      this.$valueContent = $block.find('.value-content');
+      this.$sidebarValue = $('.js-due-date-sidebar-value', $block);
+      this.fieldName = $dropdown.data('field-name'),
+      this.abilityName = $dropdown.data('ability-name'),
+      this.issueUpdateURL = $dropdown.data('issue-update')
+
+      this.rawSelectedDate = null;
+      this.displayedDate = null;
+      this.datePayload = null;
+
+      this.initGlDropdown();
+      this.initRemoveDueDate();
+      this.initDatePicker();
+      this.initStopPropagation();
+    }
+
+    initGlDropdown() {
+      this.$dropdown.glDropdown({
+        hidden: () => {
+          this.$selectbox.hide();
+          this.$value.css('display', '');
+        }
+      });
+    }
+
+    initDatePicker() {
+      this.$datePicker.datepicker({
+        dateFormat: 'yy-mm-dd',
+        defaultDate: $("input[name='" + this.fieldName + "']").val(),
+        altField: "input[name='" + this.fieldName + "']",
+        onSelect: () => {
+          return this.saveDueDate(true);
+        }
+      });
+    }
+
+    initRemoveDueDate() {
+      this.$block.on('click', '.js-remove-due-date', (e) => {
+        e.preventDefault();
+        $("input[name='" + this.fieldName + "']").val('');
+        return this.saveDueDate(false);
+      });
+    }
+
+    initStopPropagation() {
+      $(document).off('click', '.ui-datepicker-header a').on('click', '.ui-datepicker-header a', (e) => {
+        return e.stopImmediatePropagation();
+      });
+    }
+
+    saveDueDate(isDropdown) {
+      this.parseSelectedDate();
+      this.prepSelectedDate();
+      this.submitSelectedDate(isDropdown);
+    }
+
+    parseSelectedDate() {
+      this.rawSelectedDate = $("input[name='" + this.fieldName + "']").val();
+      if (this.rawSelectedDate.length) {
+        let dateObj = new Date(this.rawSelectedDate);
+        this.displayedDate = $.datepicker.formatDate('M d, yy', dateObj);
+      } else {
+        this.displayedDate = 'No due date';
+      }
+    }
+
+    prepSelectedDate() {
+      const datePayload = {};
+      datePayload[this.abilityName] = {};
+      datePayload[this.abilityName].due_date = this.rawSelectedDate;
+      this.datePayload = datePayload;
+    }
+
+    submitSelectedDate(isDropdown) {
+      return $.ajax({
+        type: 'PUT',
+        url: this.issueUpdateURL,
+        data: this.datePayload,
+        dataType: 'json',
+        beforeSend: () => {
+          const selectedDateValue = this.datePayload[this.abilityName].due_date;
+          const displayedDateStyle = this.displayedDate !== 'No due date' ? 'bold' : 'no-value';
+
+          this.$loading.fadeIn();
+
+          if (isDropdown) {
+            this.$dropdown.trigger('loading.gl.dropdown');
+            this.$selectbox.hide();
+          }
+
+          this.$value.css('display', '');
+          this.$valueContent.html(`<span class='${displayedDateStyle}'>${this.displayedDate}</span>`);
+          this.$sidebarValue.html(this.displayedDate);
+
+          return selectedDateValue.length ?
+            $('.js-remove-due-date-holder').removeClass('hidden') :
+            $('.js-remove-due-date-holder').addClass('hidden');
+
+        }
+      }).done((data) => {
+        if (isDropdown) {
+          this.$dropdown.trigger('loaded.gl.dropdown');
+          this.$dropdown.dropdown('toggle');
+        }
+        return this.$loading.fadeOut();
+      });
+    }
+  }
+
+  class DueDateSelectors {
+    constructor() {
+      this.initMilestoneDueDate();
+      this.initIssuableSelect();
+    }
+
+    initMilestoneDueDate() {
+      const $datePicker = $('.datepicker');
+
+      if ($datePicker.length) {
+        const $dueDate = $('#milestone_due_date');
+        $datePicker.datepicker({
+          dateFormat: 'yy-mm-dd',
+          onSelect: (dateText, inst) => {
+            $dueDate.val(dateText);
+          }
+        }).datepicker('setDate', $.datepicker.parseDate('yy-mm-dd', $dueDate.val()));
+      }
+      $('.js-clear-due-date').on('click', (e) => {
+        e.preventDefault();
+        $.datepicker._clearDate($datePicker);
+      });
+    }
+
+    initIssuableSelect() {
+      const $loading = $('.js-issuable-update .due_date').find('.block-loading').hide();
+
+      $('.js-due-date-select').each((i, dropdown) => {
+        const $dropdown = $(dropdown);
+        new DueDateSelect({
+          $dropdown,
+          $loading
+        });
+      });
+    }
+  }
+
+  global.DueDateSelectors = DueDateSelectors;
+
+})(window.gl || (window.gl = {}));
diff --git a/app/views/shared/issuable/_sidebar.html.haml b/app/views/shared/issuable/_sidebar.html.haml
index 0464ebddc11..6f0fa41a43f 100644
--- a/app/views/shared/issuable/_sidebar.html.haml
+++ b/app/views/shared/issuable/_sidebar.html.haml
@@ -170,5 +170,5 @@
       new LabelsSelect();
       new IssuableContext('#{escape_javascript(current_user.to_json(only: [:username, :id, :name]))}');
       new Subscription('.subscription')
-      new DueDateSelect();
+      new gl.DueDateSelectors();
       sidebar = new Sidebar();