Create basic (ugly) event detail popup

com/static/bundled/com/components/ics-calendar-index.ts

@@ -1,6 +1,6 @@
 import { makeUrl } from "#core:utils/api";
 import { inheritHtmlElement, registerComponent } from "#core:utils/web-components";
-import { Calendar } from "@fullcalendar/core";
+import { Calendar, type EventClickArg } from "@fullcalendar/core";
 import enLocale from "@fullcalendar/core/locales/en-gb";
 import frLocale from "@fullcalendar/core/locales/fr";
 import dayGridPlugin from "@fullcalendar/daygrid";
@@ -46,6 +46,71 @@ export class IcsCalendar extends inheritHtmlElement("div") {
     };
   }
 
+  formatDate(date: Date) {
+    return new Intl.DateTimeFormat(this.locale, {
+      dateStyle: "medium",
+      timeStyle: "short",
+    }).format(date);
+  }
+
+  createEventDetailPopup(event: EventClickArg) {
+    // Delete previous popup
+    const oldPopup = document.getElementById("event-details");
+    if (oldPopup !== null) {
+      oldPopup.remove();
+    }
+
+    // Create new popup
+    const popup = document.createElement("div");
+    const popupContainer = document.createElement("div");
+    const popupFirstRow = document.createElement("div");
+    const popupSecondRow = document.createElement("div");
+    const popupTitleTimeIcon = document.createElement("i");
+    const popupTitleTime = document.createElement("div");
+    const popupTitle = document.createElement("h4");
+    const popupTime = document.createElement("span");
+
+    popup.setAttribute("id", "event-details");
+    popupContainer.setAttribute("class", "event-details-container");
+    popupFirstRow.setAttribute("class", "event-details-row");
+    popupSecondRow.setAttribute("class", "event-details-row");
+
+    popupTitleTimeIcon.setAttribute("class", "fa-solid fa-calendar-days fa-xl");
+
+    popupTitle.setAttribute("class", "event-details-title");
+    popupTitle.textContent = event.event.title;
+
+    popupTime.setAttribute("class", "event-details-time");
+    popupTime.textContent = `${this.formatDate(event.event.start)} - ${this.formatDate(event.event.end)}`;
+
+    popupTitleTime.appendChild(popupTitle);
+    popupTitleTime.appendChild(popupTime);
+
+    popupFirstRow.appendChild(popupTitleTimeIcon);
+    popupSecondRow.appendChild(popupTitleTime);
+
+    popupContainer.appendChild(popupFirstRow);
+    popupContainer.appendChild(popupSecondRow);
+
+    popup.appendChild(popupContainer);
+
+    // We can't just add the element relative to the one we want to appear under
+    // Otherwise, it either gets clipped by the boundaries of the calendar or resize cells
+    // Here, we create a popup outside the calendar that follows the clicked element
+    this.node.appendChild(popup);
+    const follow = (node: HTMLElement) => {
+      const rect = node.getBoundingClientRect();
+      popup.setAttribute(
+        "style",
+        `top: calc(${rect.top + window.scrollY}px + ${rect.height}px); left: ${rect.left + window.scrollX}px;`,
+      );
+    };
+    follow(event.el);
+    window.addEventListener("resize", () => {
+      follow(event.el);
+    });
+  }
+
   async connectedCallback() {
     super.connectedCallback();
     this.calendar = new Calendar(this.node, {
@@ -69,7 +134,20 @@ export class IcsCalendar extends inheritHtmlElement("div") {
         this.calendar.changeView(this.currentView());
         this.calendar.setOption("headerToolbar", this.currentToolbar());
       },
+      eventClick: (event) => {
+        // Avoid our popup to be deleted because we clicked outside of it
+        event.jsEvent.stopPropagation();
+        this.createEventDetailPopup(event);
+      },
     });
     this.calendar.render();
+
+    window.addEventListener("click", (event: MouseEvent) => {
+      // Auto close popups when clicking outside of it
+      const popup = document.getElementById("event-details");
+      if (popup !== null && !popup.contains(event.target as Node)) {
+        popup.remove();
+      }
+    });
   }
 }