Extend timezone dropdown

Adds optional paramters to the constructor to allow
reuse of the timezone dropdown on other pages

app/assets/javascripts/pages/projects/pipeline_schedules/shared/components/timezone_dropdown.js

-/* eslint-disable class-methods-use-this */
+const defaultTimezone = 'UTC';
+
+export const formatUtcOffset = offset => {
+  const parsed = parseInt(offset, 10);
+  if (Number.isNaN(parsed) || parsed === 0) {
+    return `0`;
+  }
+  const prefix = offset > 0 ? '+' : '-';
+  return `${prefix} ${Math.abs(offset / 3600)}`;
+};
 
-import $ from 'jquery';
+export const formatTimezone = item => `[UTC ${formatUtcOffset(item.offset)}] ${item.name}`;
 
-const defaultTimezone = 'UTC';
+const defaults = {
+  $inputEl: null,
+  $dropdownEl: null,
+  onSelectTimezone: null,
+};
 
 export default class TimezoneDropdown {
-  constructor() {
-    this.$dropdown = $('.js-timezone-dropdown');
+  constructor({ $dropdownEl, $inputEl, onSelectTimezone } = defaults) {
+    this.$dropdown = $dropdownEl;
     this.$dropdownToggle = this.$dropdown.find('.dropdown-toggle-text');
-    this.$input = $('#schedule_cron_timezone');
+    this.$input = $inputEl;
     this.timezoneData = this.$dropdown.data('data');
+
     this.initDefaultTimezone();
     this.initDropdown();
+
+    this.onSelectTimezone = onSelectTimezone;
   }
 
   initDropdown() {
@@ -24,28 +40,12 @@ export default class TimezoneDropdown {
         fields: ['name'],
       },
       clicked: cfg => this.updateInputValue(cfg),
-      text: item => this.formatTimezone(item),
+      text: item => formatTimezone(item),
     });
 
     this.setDropdownToggle();
   }
 
-  formatUtcOffset(offset) {
-    let prefix = '';
-
-    if (offset > 0) {
-      prefix = '+';
-    } else if (offset < 0) {
-      prefix = '-';
-    }
-
-    return `${prefix} ${Math.abs(offset / 3600)}`;
-  }
-
-  formatTimezone(item) {
-    return `[UTC ${this.formatUtcOffset(item.offset)}] ${item.name}`;
-  }
-
   initDefaultTimezone() {
     const initialValue = this.$input.val();
 
@@ -56,13 +56,14 @@ export default class TimezoneDropdown {
 
   setDropdownToggle() {
     const initialValue = this.$input.val();
-
     this.$dropdownToggle.text(initialValue);
   }
 
   updateInputValue({ selectedObj, e }) {
     e.preventDefault();
     this.$input.val(selectedObj.identifier);
-    gl.pipelineScheduleFieldErrors.updateFormValidityState();
+    if (this.onSelectTimezone) {
+      this.onSelectTimezone({ selectedObj, e });
+    }
   }
 }

app/assets/javascripts/pages/projects/pipeline_schedules/shared/init_form.js

@@ -41,7 +41,13 @@ export default () => {
 
   const formElement = document.getElementById('new-pipeline-schedule-form');
 
-  gl.timezoneDropdown = new TimezoneDropdown();
+  gl.timezoneDropdown = new TimezoneDropdown({
+    $dropdownEl: $('.js-timezone-dropdown'),
+    $inputEl: $('#schedule_cron_timezone'),
+    onSelectTimezone: () => {
+      gl.pipelineScheduleFieldErrors.updateFormValidityState();
+    },
+  });
   gl.targetBranchDropdown = new TargetBranchDropdown();
   gl.pipelineScheduleFieldErrors = new GlFieldErrors(formElement);
 

changelogs/unreleased/ekigbo-extend-timezone-dropdown.yml

+---
+title: Extend timezone dropdown
+merge_request: 26311
+author:
+type: changed

spec/javascripts/pages/projects/pipeline_schedules/shared/components/timezone_dropdown_spec.js

+import $ from 'jquery';
+import GLDropdown from '~/gl_dropdown'; // eslint-disable-line no-unused-vars
+import TimezoneDropdown, {
+  formatUtcOffset,
+  formatTimezone,
+} from '~/pages/projects/pipeline_schedules/shared/components/timezone_dropdown';
+
+describe('Timezone Dropdown', function() {
+  preloadFixtures('pipeline_schedules/edit.html');
+
+  let $inputEl = null;
+  let $dropdownEl = null;
+  let $wrapper = null;
+  const tzListSel = '.dropdown-content ul li a.is-active';
+
+  describe('Initialize', () => {
+    describe('with dropdown already loaded', () => {
+      beforeEach(() => {
+        loadFixtures('pipeline_schedules/edit.html');
+        $wrapper = $('.dropdown');
+        $inputEl = $('#schedule_cron_timezone');
+        $dropdownEl = $('.js-timezone-dropdown');
+
+        // eslint-disable-next-line no-new
+        new TimezoneDropdown({
+          $inputEl,
+          $dropdownEl,
+        });
+      });
+
+      it('can take an $inputEl in the constructor', () => {
+        const tzStr = '[UTC + 5.5] Sri Jayawardenepura';
+        const tzValue = 'Asia/Colombo';
+
+        expect($inputEl.val()).toBe('UTC');
+
+        $(`${tzListSel}:contains('${tzStr}')`, $wrapper).trigger('click');
+
+        const val = $inputEl.val();
+
+        expect(val).toBe(tzValue);
+        expect(val).not.toBe('UTC');
+      });
+
+      it('will format data array of timezones into a list of offsets', () => {
+        const data = $dropdownEl.data('data');
+        const formatted = $wrapper.find(tzListSel).text();
+
+        data.forEach(item => {
+          expect(formatted).toContain(formatTimezone(item));
+        });
+      });
+
+      it('will default the timezone to UTC', () => {
+        const tz = $inputEl.val();
+
+        expect(tz).toBe('UTC');
+      });
+    });
+
+    describe('without dropdown loaded', () => {
+      beforeEach(() => {
+        loadFixtures('pipeline_schedules/edit.html');
+        $wrapper = $('.dropdown');
+        $inputEl = $('#schedule_cron_timezone');
+        $dropdownEl = $('.js-timezone-dropdown');
+      });
+
+      it('will populate the list of UTC offsets after the dropdown is loaded', () => {
+        expect($wrapper.find(tzListSel).length).toEqual(0);
+
+        // eslint-disable-next-line no-new
+        new TimezoneDropdown({
+          $inputEl,
+          $dropdownEl,
+        });
+
+        expect($wrapper.find(tzListSel).length).toEqual($($dropdownEl).data('data').length);
+      });
+
+      it('will call a provided handler when a new timezone is selected', () => {
+        const onSelectTimezone = jasmine.createSpy('onSelectTimezoneMock');
+        // eslint-disable-next-line no-new
+        new TimezoneDropdown({
+          $inputEl,
+          $dropdownEl,
+          onSelectTimezone,
+        });
+
+        $wrapper
+          .find(tzListSel)
+          .first()
+          .trigger('click');
+
+        expect(onSelectTimezone).toHaveBeenCalled();
+      });
+    });
+  });
+
+  describe('formatUtcOffset', () => {
+    it('will convert negative utc offsets in seconds to hours and minutes', () => {
+      expect(formatUtcOffset(-21600)).toEqual('- 6');
+    });
+
+    it('will convert positive utc offsets in seconds to hours and minutes', () => {
+      expect(formatUtcOffset(25200)).toEqual('+ 7');
+      expect(formatUtcOffset(49500)).toEqual('+ 13.75');
+    });
+
+    it('will return 0 when given a string', () => {
+      expect(formatUtcOffset('BLAH')).toEqual('0');
+      expect(formatUtcOffset('$%$%')).toEqual('0');
+    });
+
+    it('will return 0 when given an array', () => {
+      expect(formatUtcOffset(['an', 'array'])).toEqual('0');
+    });
+
+    it('will return 0 when given an object', () => {
+      expect(formatUtcOffset({ some: '', object: '' })).toEqual('0');
+    });
+
+    it('will return 0 when given null', () => {
+      expect(formatUtcOffset(null)).toEqual('0');
+    });
+
+    it('will return 0 when given undefined', () => {
+      expect(formatUtcOffset(undefined)).toEqual('0');
+    });
+
+    it('will return 0 when given empty input', () => {
+      expect(formatUtcOffset('')).toEqual('0');
+    });
+  });
+
+  describe('formatTimezone', () => {
+    it('given name: "Chatham Is.", offset: "49500", will format for display as "[UTC + 13.75] Chatham Is."', () => {
+      expect(
+        formatTimezone({
+          name: 'Chatham Is.',
+          offset: 49500,
+          identifier: 'Pacific/Chatham',
+        }),
+      ).toEqual('[UTC + 13.75] Chatham Is.');
+    });
+
+    it('given name: "Saskatchewan", offset: "-21600", will format for display as "[UTC - 6] Saskatchewan"', () => {
+      expect(
+        formatTimezone({
+          name: 'Saskatchewan',
+          offset: -21600,
+          identifier: 'America/Regina',
+        }),
+      ).toEqual('[UTC - 6] Saskatchewan');
+    });
+
+    it('given name: "Accra", offset: "0", will format for display as "[UTC 0] Accra"', () => {
+      expect(
+        formatTimezone({
+          name: 'Accra',
+          offset: 0,
+          identifier: 'Africa/Accra',
+        }),
+      ).toEqual('[UTC 0] Accra');
+    });
+  });
+});