Extract monthNavigator custom element

src/Infrastructure/FairCalendar/Controller/FairCalendarController.ts

@@ -40,10 +40,11 @@ export class FairCalendarController {
     @Query() dto: FairCalendarControllerDTO,
     @LoggedUser() user: User
   ) {
-    const date =
-      dto.month !== undefined && dto.year !== undefined
-        ? new Date(dto.year, dto.month, 15)
-        : new Date();
+    let date = new Date();
+
+    if (dto.year !== undefined && dto.month !== undefined) {
+      date = new Date(dto.year, dto.month - 1, 15);
+    }
 
     const userId = dto.userId ? dto.userId : user['id'];
 
@@ -101,7 +102,7 @@ export class FairCalendarController {
       overviewTable,
       fullCalendarEvents,
       date,
-      currentMonth: date.getMonth(),
+      currentMonth: date.getMonth() + 1,
       currentYear: date.getFullYear(),
       userId
     };

src/assets/customElements/index.js

@@ -2,13 +2,13 @@
 import autoForm from './autoForm';
 import clipboardButton from './clipboardButton';
 import eventForm from './eventForm';
-import fairCalendarFiltersForm from './fairCalendarFiltersForm';
+import monthNavigator from './monthNavigator';
 import navMenuButton from './navMenuButton';
 import themeToggler from './themeToggler';
 
 customElements.define('pc-auto-form', autoForm);
 customElements.define('pc-clipboard-button', clipboardButton);
 customElements.define('pc-event-form', eventForm);
-customElements.define('pc-faircalendar-filters-form', fairCalendarFiltersForm);
+customElements.define('pc-month-navigator', monthNavigator);
 customElements.define('pc-nav-menu-button', navMenuButton);
 customElements.define('pc-theme-toggler', themeToggler);

src/assets/customElements/monthNavigator.js

@@ -0,0 +1,85 @@
+// @ts-check
+import { onParsed, waitForElement } from '../lib/customElements';
+
+export default class extends HTMLElement {
+  /** @type {HTMLInputElement} */
+  #month;
+
+  /** @type {HTMLInputElement} */
+  #year;
+
+  connectedCallback() {
+    onParsed(() => {
+      const parent = /** @type {HTMLElement} */ (this.parentElement);
+
+      const findFields = /** @type {Promise<[HTMLInputElement, HTMLInputElement]>} */ (Promise.all(
+        [
+          waitForElement(this.dataset.monthTarget || '', parent, {
+            timeout: 3000
+          }),
+          waitForElement(this.dataset.yearTarget || '', parent, {
+            timeout: 3000
+          })
+        ]
+      ));
+
+      findFields.then(([month, year]) => {
+        // Assume month is 1 (January) to 12 (December)
+        this.#month = month;
+        this.#year = year;
+
+        const template = /** @type {HTMLTemplateElement} */ (this.querySelector(
+          'template'
+        ));
+
+        this.appendChild(document.importNode(template.content, true));
+
+        const previousBtn = /** @type {HTMLButtonElement} */ (this.querySelector(
+          'button[data-previous]'
+        ));
+
+        const todayBtn = /** @type {HTMLButtonElement} */ (this.querySelector(
+          'button[data-today]'
+        ));
+
+        const nextBtn = /** @type {HTMLButtonElement} */ (this.querySelector(
+          'button[data-next]'
+        ));
+
+        previousBtn.addEventListener('click', () => {
+          this._updateMonth(+month.value - 1);
+        });
+
+        todayBtn.addEventListener('click', () => {
+          const today = new Date();
+          month.value = (today.getMonth() + 1).toString();
+          year.value = today.getFullYear().toString();
+          // Trigger change on either field, but only once
+          year.dispatchEvent(new Event('change'));
+        });
+
+        nextBtn.addEventListener('click', () => {
+          this._updateMonth(+month.value + 1);
+        });
+      });
+    });
+  }
+
+  /**
+   * @param {number} month
+   */
+  _updateMonth(month) {
+    if (month < 1) {
+      month += 12;
+      this.#year.value = (+this.#year.value - 1).toString();
+    }
+
+    if (month > 12) {
+      month -= 12;
+      this.#year.value = (+this.#year.value + 1).toString();
+    }
+
+    this.#month.value = month.toString();
+    this.#month.dispatchEvent(new Event('change'));
+  }
+}

src/assets/lib/customElements.js

@@ -7,3 +7,39 @@
 export function onParsed(cb) {
   requestAnimationFrame(cb);
 }
+
+/**
+ * Wait until an element appears in the DOM.
+ * Credit: https://stackoverflow.com/a/61511955
+ * @param {string} selector
+ * @param {Element} root
+ * @param {{timeout?: number}} options
+ * @returns {Promise<Element>}
+ */
+export function waitForElement(selector, root, { timeout } = {}) {
+  return new Promise(resolve => {
+    let timeoutHandle;
+
+    if (timeout) {
+      timeoutHandle = setTimeout(
+        () => reject(`failed to find ${selector} after ${timeout} ms`),
+        timeout
+      );
+    }
+
+    if (document.querySelector(selector)) {
+      clearTimeout(timeoutHandle);
+      return resolve(document.querySelector(selector));
+    }
+
+    const observer = new MutationObserver(_mutations => {
+      if (document.querySelector(selector)) {
+        observer.disconnect();
+        clearTimeout(timeoutHandle);
+        resolve(document.querySelector(selector));
+      }
+    });
+
+    observer.observe(root, { childList: true, subtree: true });
+  });
+}

src/templates/macros/month_navigator.njk

@@ -0,0 +1,20 @@
+{% import 'macros/icons.njk' as icons %}
+
+{% macro month_navigator(monthTarget, yearTarget) %}
+    <pc-month-navigator data-month-target="{{ monthTarget }}" data-year-target="{{ yearTarget }}">
+        <template>
+            <div class="pc-cluster" style="--cluster-align: stretch">
+                {# TODO: translations #}
+                <button type="button" data-previous class="pc-btn pc-btn--muted" title="Mois précédent">
+                    {{ '<' }}
+                </button>
+                <button type="button" data-today class="pc-btn pc-btn--muted" title="Aujourd'hui">
+                    {{ icons.calendar() }}
+                </button>
+                <button type="button" data-next class="pc-btn pc-btn--muted" title="Mois suivant">
+                    {{ '>' }}
+                </button>
+            </div>
+        </template>
+    </pc-month-navigator>
+{% endmacro %}

src/templates/pages/faircalendar/_filters_form.njk

@@ -1,44 +1,40 @@
+{% from 'macros/month_navigator.njk' import month_navigator %}
+
 {% macro filters_form() %}
-    <pc-faircalendar-filters-form>
-        <form
-            method="GET"
-            action="{{ path('faircalendar_index') }}"
-            class="pc-cluster pc-gap"
-            style="--cluster-align: flex-end"
-        >
-            <template id="faircalendar-filters-form-navigation">
-                <div class="pc-cluster" style="--cluster-align: stretch">
-                    <button id="previousBtn" type="button" class="pc-btn pc-btn--muted" title="Mois précédent">{{ '<' }}</button>
-                    <button id="todayBtn" type="button" class="pc-btn pc-btn--muted" title="Aujourd'hui">
-                        {{ icons.calendar() }}
-                    </button>
-                    <button id="nextBtn" type="button" class="pc-btn pc-btn--muted" title="Mois suivant">{{ '>' }}</button>
-                </div>
-            </template>
+    <div class="pc-cluster pc-gap" style="--cluster-align: flex-end">
+        {{ month_navigator(monthTarget='#month', yearTarget='#year') }}
 
-            <div class="pc-select-group pc-m" style="--m: 0">
-                <label class="pc-label" for="month">{{ 'faircalendar-filters-month-title'|trans }}</label>
-                <select name="month" id="month">
-                    {% for month in range(12) %}
-                        <option value="{{ month }}" {% if month == currentMonth %}selected{% endif %}>{{ month|longMonth|capitalize }}</option>
-                    {% endfor %}
-                </select>
-            </div>
-            <div class="pc-input-group pc-m" style="--m: 0">
-                <label class="pc-label" for="year">{{ 'faircalendar-filters-year-title'|trans }}</label>
-                <input name="year" id="year" type="number" value="{{ currentYear }}">
-            </div>
-            <div class="pc-select-group pc-m" style="--m: 0">
-                <label class="pc-label" for="userId">{{ 'faircalendar-filters-userId-title'|trans }}</label>
-                <select name="userId" id="userId">
-                    {% for user in users %}
-                        <option value="{{ user.id }}" {% if user.id == userId %}selected{% endif %}>{{ user|fullName }}</option>
-                    {% endfor %}
-                </select>
-            </div>
-            <button type="submit" class="pc-btn pc-btn--secondary">
-                {{ 'common-form-update'|trans }}
-            </button>
-        </form>
-    </pc-faircalendar-filters-form>
+        <pc-auto-form>
+            <form
+                method="GET"
+                action="{{ path('faircalendar_index') }}"
+                class="pc-cluster pc-gap"
+                style="--cluster-align: flex-end"
+            >
+                <div class="pc-select-group pc-m" style="--m: 0">
+                    <label class="pc-label" for="month">{{ 'faircalendar-filters-month-title'|trans }}</label>
+                    <select name="month" id="month">
+                        {% for month in range(1, 13) %}
+                            <option value="{{ month }}" {% if month == currentMonth %}selected{% endif %}>{{ (month - 1)|longMonth|capitalize }}</option>
+                        {% endfor %}
+                    </select>
+                </div>
+                <div class="pc-input-group pc-m" style="--m: 0">
+                    <label class="pc-label" for="year">{{ 'faircalendar-filters-year-title'|trans }}</label>
+                    <input name="year" id="year" type="number" value="{{ currentYear }}">
+                </div>
+                <div class="pc-select-group pc-m" style="--m: 0">
+                    <label class="pc-label" for="userId">{{ 'faircalendar-filters-userId-title'|trans }}</label>
+                    <select name="userId" id="userId">
+                        {% for user in users %}
+                            <option value="{{ user.id }}" {% if user.id == userId %}selected{% endif %}>{{ user|fullName }}</option>
+                        {% endfor %}
+                    </select>
+                </div>
+                <button type="submit" class="pc-btn pc-btn--secondary">
+                    {{ 'common-form-update'|trans }}
+                </button>
+            </form>
+        </pc-auto-form>
+    </div>
 {% endmacro %}