Add unregister functionality and delete icon for participants in activity cards

Author: cx-demo

src/app.py

@@ -1,3 +1,4 @@
+
 """
 High School Management System API
 
@@ -109,3 +110,19 @@ def signup_for_activity(activity_name: str, email: str):
     # Add student
     activity["participants"].append(email)
     return {"message": f"Signed up {email} for {activity_name}"}
+
+@app.post("/activities/{activity_name}/unregister")
+def unregister_from_activity(activity_name: str, email: str):
+    """Remove a student from an activity"""
+    # Validate activity exists
+    if activity_name not in activities:
+        raise HTTPException(status_code=404, detail="Activity not found")
+
+    activity = activities[activity_name]
+
+    # Validate student is signed up
+    if email not in activity["participants"]:
+        raise HTTPException(status_code=400, detail="Student not registered for this activity")
+
+    activity["participants"].remove(email)
+    return {"message": f"Removed {email} from {activity_name}"}

src/static/app.js

@@ -20,14 +20,19 @@ document.addEventListener("DOMContentLoaded", () => {
 
         const spotsLeft = details.max_participants - details.participants.length;
 
-        // Participants list HTML
+        // Participants list HTML with delete icon
         let participantsHTML = "";
         if (details.participants.length > 0) {
           participantsHTML = `
             <div class="participants-section">
               <strong>Participants:</strong>
               <ul class="participants-list">
-                ${details.participants.map(p => `<li>${p}</li>`).join("")}
+                ${details.participants.map(p => `
+                  <li>
+                    <span class="participant-email">${p}</span>
+                    <span class="delete-icon" title="Remove participant" data-activity="${name}" data-email="${p}">&times;</span>
+                  </li>
+                `).join("")}
               </ul>
             </div>
           `;
@@ -48,6 +53,42 @@ document.addEventListener("DOMContentLoaded", () => {
           ${participantsHTML}
         `;
 
+        // Add event listener for delete icons after rendering
+        setTimeout(() => {
+          activityCard.querySelectorAll('.delete-icon').forEach(icon => {
+            icon.addEventListener('click', async (e) => {
+              const activityName = icon.getAttribute('data-activity');
+              const email = icon.getAttribute('data-email');
+              if (!activityName || !email) return;
+              try {
+                const response = await fetch(`/activities/${encodeURIComponent(activityName)}/unregister?email=${encodeURIComponent(email)}`, {
+                  method: 'POST',
+                });
+                const result = await response.json();
+                if (response.ok) {
+                  messageDiv.textContent = result.message || 'Participant removed.';
+                  messageDiv.className = 'success';
+                  fetchActivities();
+                } else {
+                  messageDiv.textContent = result.detail || 'Failed to remove participant.';
+                  messageDiv.className = 'error';
+                }
+                messageDiv.classList.remove('hidden');
+                setTimeout(() => {
+                  messageDiv.classList.add('hidden');
+                }, 4000);
+              } catch (err) {
+                messageDiv.textContent = 'Error removing participant.';
+                messageDiv.className = 'error';
+                messageDiv.classList.remove('hidden');
+                setTimeout(() => {
+                  messageDiv.classList.add('hidden');
+                }, 4000);
+              }
+            });
+          });
+        }, 0);
+
         activitiesList.appendChild(activityCard);
 
         // Add option to select dropdown
@@ -83,6 +124,7 @@ document.addEventListener("DOMContentLoaded", () => {
         messageDiv.textContent = result.message;
         messageDiv.className = "success";
         signupForm.reset();
+        fetchActivities();
       } else {
         messageDiv.textContent = result.detail || "An error occurred";
         messageDiv.className = "error";

src/static/styles.css

@@ -158,10 +158,24 @@ footer {
 }
 
 .participants-list {
-  list-style-type: disc;
-  margin-left: 20px;
+  list-style-type: none;
+  margin-left: 0;
   margin-bottom: 0;
   color: #333;
+  padding-left: 0;
+}
+
+.delete-icon {
+  display: inline-block;
+  margin-left: 8px;
+  color: #c62828;
+  cursor: pointer;
+  font-size: 16px;
+  vertical-align: middle;
+  transition: color 0.2s;
+}
+.delete-icon:hover {
+  color: #a31515;
 }
 
 .no-participants {