feat(datetime-button): support multiple date selection

core/src/components/datetime-button/datetime-button.tsx

@@ -2,9 +2,9 @@ import type { ComponentInterface } from '@stencil/core';
 import { Component, Element, Host, Prop, State, h } from '@stencil/core';
 
 import { getIonMode } from '../../global/ionic-global';
-import type { Color, DatetimePresentation, DatetimeParts } from '../../interface';
+import type { Color, DatetimePresentation } from '../../interface';
 import { componentOnReady, addEventListener } from '../../utils/helpers';
-import { printIonError, printIonWarning } from '../../utils/logging';
+import { printIonError } from '../../utils/logging';
 import { createColorClasses } from '../../utils/theme';
 import { getToday } from '../datetime/utils/data';
 import { getMonthAndYear, getMonthDayAndYear, getLocalizedDateTime, getLocalizedTime } from '../datetime/utils/format';
@@ -153,6 +153,24 @@ export class DatetimeButton implements ComponentInterface {
     });
   }
 
+  /**
+   * Accepts one or more string values and converts
+   * them to DatetimeParts. This is done so datetime-button
+   * can work with an array internally and not need
+   * to keep checking if the datetime value is `string` or `string[]`.
+   */
+  private getParsedDateValues = (value?: string[] | string | null): string[] => {
+    if (value === undefined || value === null) {
+      return [];
+    }
+
+    if (Array.isArray(value)) {
+      return value;
+    }
+
+    return [value];
+  };
+
   /**
    * Check the value property on the linked
    * ion-datetime and then format it according
@@ -165,36 +183,38 @@ export class DatetimeButton implements ComponentInterface {
       return;
     }
 
-    const { value, locale, hourCycle, preferWheel, multiple } = datetimeEl;
+    const { value, locale, hourCycle, preferWheel, multiple, titleSelectedDatesFormatter } = datetimeEl;
 
-    if (multiple) {
-      printIonWarning(
-        `Multi-date selection cannot be used with ion-datetime-button.
-
-Please upvote https://github.com/ionic-team/ionic-framework/issues/25668 if you are interested in seeing this functionality added.
-      `,
-        this.el
-      );
-      return;
-    }
+    const parsedValues = this.getParsedDateValues(value);
 
     /**
      * Both ion-datetime and ion-datetime-button default
      * to today's date and time if no value is set.
      */
-    const parsedDatetime = parseDate(value ?? getToday()) as DatetimeParts;
+    const parsedDatetimes = parseDate(parsedValues.length > 0 ? parsedValues : [getToday()]);
+
+    /**
+     * If developers incorrectly use multiple="true"
+     * with non "date" datetimes, then just select
+     * the first value so the interface does
+     * not appear broken. Datetime will provide a
+     * warning in the console.
+     */
+    const firstParsedDatetime = parsedDatetimes[0];
     const use24Hour = is24Hour(locale, hourCycle);
 
     // TODO(FW-1865) - Remove once FW-1831 is fixed.
-    parsedDatetime.tzOffset = undefined;
+    parsedDatetimes.forEach((parsedDatetime) => {
+      parsedDatetime.tzOffset = undefined;
+    });
 
     this.dateText = this.timeText = undefined;
 
     switch (datetimePresentation) {
       case 'date-time':
       case 'time-date':
-        const dateText = getMonthDayAndYear(locale, parsedDatetime);
-        const timeText = getLocalizedTime(locale, parsedDatetime, use24Hour);
+        const dateText = getMonthDayAndYear(locale, firstParsedDatetime);
+        const timeText = getLocalizedTime(locale, firstParsedDatetime, use24Hour);
         if (preferWheel) {
           this.dateText = `${dateText} ${timeText}`;
         } else {
@@ -203,19 +223,31 @@ Please upvote https://github.com/ionic-team/ionic-framework/issues/25668 if you
         }
         break;
       case 'date':
-        this.dateText = getMonthDayAndYear(locale, parsedDatetime);
+        if (multiple && parsedValues.length !== 1) {
+          let headerText = `${parsedValues.length} days`; // default/fallback for multiple selection
+          if (titleSelectedDatesFormatter !== undefined) {
+            try {
+              headerText = titleSelectedDatesFormatter(parsedValues);
+            } catch (e) {
+              printIonError('Exception in provided `titleSelectedDatesFormatter`: ', e);
+            }
+          }
+          this.dateText = headerText;
+        } else {
+          this.dateText = getMonthDayAndYear(locale, firstParsedDatetime);
+        }
         break;
       case 'time':
-        this.timeText = getLocalizedTime(locale, parsedDatetime, use24Hour);
+        this.timeText = getLocalizedTime(locale, firstParsedDatetime, use24Hour);
         break;
       case 'month-year':
-        this.dateText = getMonthAndYear(locale, parsedDatetime);
+        this.dateText = getMonthAndYear(locale, firstParsedDatetime);
         break;
       case 'month':
-        this.dateText = getLocalizedDateTime(locale, parsedDatetime, { month: 'long' });
+        this.dateText = getLocalizedDateTime(locale, firstParsedDatetime, { month: 'long' });
         break;
       case 'year':
-        this.dateText = getLocalizedDateTime(locale, parsedDatetime, { year: 'numeric' });
+        this.dateText = getLocalizedDateTime(locale, firstParsedDatetime, { year: 'numeric' });
         break;
     }
   };

core/src/components/datetime-button/test/multiple/datetime-button.e2e.ts

@@ -0,0 +1,100 @@
+import { expect } from '@playwright/test';
+import { test } from '@utils/test/playwright';
+
+test.describe('datetime-button: multiple selection', () => {
+  test.beforeEach(async ({ skip }) => {
+    skip.rtl();
+    skip.mode('ios', 'No mode-specific logic');
+  });
+  test('should render number of dates when more than 1 date is selected', async ({ page }) => {
+    await page.setContent(`
+      <ion-datetime-button datetime="datetime"></ion-datetime-button>
+      <ion-datetime locale="en-US" id="datetime" presentation="date" multiple="true"></ion-datetime>
+
+      <script>
+        const datetime = document.querySelector('ion-datetime');
+        datetime.value = ['2022-06-01', '2022-06-02', '2022-06-03'];
+      </script>
+    `);
+    await page.waitForSelector('.datetime-ready');
+
+    await expect(page.locator('#date-button')).toContainText('3 days');
+  });
+  test('should render number of dates when 0 dates are selected', async ({ page }) => {
+    await page.setContent(`
+      <ion-datetime-button datetime="datetime"></ion-datetime-button>
+      <ion-datetime locale="en-US" id="datetime" presentation="date" multiple="true"></ion-datetime>
+    `);
+    await page.waitForSelector('.datetime-ready');
+
+    await expect(page.locator('#date-button')).toHaveText('0 days');
+  });
+  test('should render date when only 1 day is selected', async ({ page }) => {
+    await page.setContent(`
+      <ion-datetime-button datetime="datetime"></ion-datetime-button>
+      <ion-datetime locale="en-US" id="datetime" presentation="date" multiple="true"></ion-datetime>
+
+      <script>
+        const datetime = document.querySelector('ion-datetime');
+        datetime.value = ['2022-06-01'];
+      </script>
+    `);
+    await page.waitForSelector('.datetime-ready');
+
+    await expect(page.locator('#date-button')).toHaveText('Jun 1, 2022');
+  });
+  test('should use customFormatter', async ({ page }) => {
+    await page.setContent(`
+      <ion-datetime-button datetime="datetime"></ion-datetime-button>
+      <ion-datetime locale="en-US" id="datetime" presentation="date" multiple="true"></ion-datetime>
+
+      <script>
+        const datetime = document.querySelector('ion-datetime');
+        datetime.titleSelectedDatesFormatter = (selectedDates) => {
+          return 'Selected: ' + selectedDates.length;
+        };
+        datetime.value = ['2022-06-01', '2022-06-02', '2022-06-03'];
+      </script>
+    `);
+    await page.waitForSelector('.datetime-ready');
+
+    await expect(page.locator('#date-button')).toHaveText('Selected: 3');
+  });
+  test('should re-render when value is programmatically changed', async ({ page }) => {
+    await page.setContent(`
+      <ion-datetime-button datetime="datetime"></ion-datetime-button>
+      <ion-datetime locale="en-US" id="datetime" presentation="date" multiple="true"></ion-datetime>
+
+      <script>
+        const datetime = document.querySelector('ion-datetime');
+        datetime.value = ['2022-06-01', '2022-06-02'];
+      </script>
+    `);
+    await page.waitForSelector('.datetime-ready');
+
+    const datetime = page.locator('ion-datetime');
+    const ionChange = await page.spyOnEvent('ionChange');
+    const dateButton = page.locator('#date-button');
+    await expect(dateButton).toHaveText('2 days');
+
+    await datetime.evaluate((el: HTMLIonDatetimeElement) => (el.value = ['2022-06-01', '2022-06-02', '2022-06-03']));
+    await ionChange.next();
+
+    await expect(dateButton).toHaveText('3 days');
+  });
+  test('should render single date if datetime is used incorrectly', async ({ page }) => {
+    await page.setContent(`
+      <ion-datetime-button datetime="datetime"></ion-datetime-button>
+      <ion-datetime locale="en-US" id="datetime" presentation="date-time" multiple="true"></ion-datetime>
+
+      <script>
+        const datetime = document.querySelector('ion-datetime');
+        datetime.value = ['2022-06-01T16:30', '2022-06-02'];
+      </script>
+    `);
+    await page.waitForSelector('.datetime-ready');
+
+    await expect(page.locator('#date-button')).toHaveText('Jun 1, 2022');
+    await expect(page.locator('#time-button')).toHaveText('4:30 PM');
+  });
+});

core/src/components/datetime-button/test/multiple/index.html

@@ -0,0 +1,112 @@
+<!DOCTYPE html>
+<html lang="en" dir="ltr">
+  <head>
+    <meta charset="UTF-8" />
+    <title>Datetime Button - Multiple</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0" />
+    <link href="../../../../../css/ionic.bundle.css" rel="stylesheet" />
+    <link href="../../../../../scripts/testing/styles.css" rel="stylesheet" />
+    <script src="../../../../../scripts/testing/scripts.js"></script>
+    <script type="module" src="../../../../../dist/ionic/ionic.esm.js"></script>
+    <style>
+      .grid {
+        display: grid;
+        grid-template-columns: repeat(auto-fill, minmax(325px, 1fr));
+        grid-row-gap: 20px;
+        grid-column-gap: 20px;
+      }
+      h2 {
+        font-size: 12px;
+        font-weight: normal;
+
+        color: #6f7378;
+
+        margin-top: 10px;
+        margin-left: 5px;
+      }
+    </style>
+  </head>
+  <body>
+    <ion-app>
+      <ion-header>
+        <ion-toolbar>
+          <ion-title>Datetime Button - Multiple</ion-title>
+        </ion-toolbar>
+      </ion-header>
+      <ion-content>
+        <div class="grid">
+          <div class="grid-item">
+            <h2>One Date</h2>
+
+            <ion-item>
+              <ion-label>Start Date</ion-label>
+              <ion-datetime-button slot="end" datetime="default-datetime"></ion-datetime-button>
+            </ion-item>
+
+            <ion-popover arrow="false">
+              <ion-datetime
+                locale="en-US"
+                presentation="date"
+                id="default-datetime"
+                multiple="true"
+                value="2022-03-15T00:43:00"
+              ></ion-datetime>
+            </ion-popover>
+          </div>
+
+          <div class="grid-item">
+            <h2>No Dates</h2>
+
+            <ion-item>
+              <ion-label>Start Date</ion-label>
+              <ion-datetime-button slot="end" datetime="no-dates-datetime"></ion-datetime-button>
+            </ion-item>
+
+            <ion-popover arrow="false">
+              <ion-datetime locale="en-US" presentation="date" id="no-dates-datetime" multiple="true"></ion-datetime>
+            </ion-popover>
+          </div>
+
+          <div class="grid-item">
+            <h2>Multiple Dates</h2>
+
+            <ion-item>
+              <ion-label>Start Date</ion-label>
+              <ion-datetime-button slot="end" datetime="multiple-dates-datetime"></ion-datetime-button>
+            </ion-item>
+
+            <ion-popover arrow="false">
+              <ion-datetime
+                locale="en-US"
+                presentation="date"
+                id="multiple-dates-datetime"
+                multiple="true"
+              ></ion-datetime>
+            </ion-popover>
+          </div>
+
+          <div class="grid-item">
+            <h2>Custom Formatter</h2>
+
+            <ion-item>
+              <ion-label>Start Date</ion-label>
+              <ion-datetime-button slot="end" datetime="custom-datetime"></ion-datetime-button>
+            </ion-item>
+
+            <ion-popover arrow="false">
+              <ion-datetime locale="en-US" presentation="date" id="custom-datetime" multiple="true"></ion-datetime>
+            </ion-popover>
+          </div>
+        </div>
+
+        <script>
+          const multipleDatesDatetime = document.querySelector('ion-datetime#multiple-dates-datetime');
+          const customDatetime = document.querySelector('ion-datetime#custom-datetime');
+
+          multipleDatesDatetime.value = ['2022-06-01', '2022-06-02', '2022-06-03'];
+          customDatetime.titleSelectedDatesFormatter = (selected) => `${selected.length} Selected`;
+        </script>
+      </ion-content>
+    </ion-app>
+  </body>
+</html>