diff --git a/Sprint-3/alarmclock/alarmclock.js b/Sprint-3/alarmclock/alarmclock.js
index 6ca81cd3b..cf5e43935 100644
--- a/Sprint-3/alarmclock/alarmclock.js
+++ b/Sprint-3/alarmclock/alarmclock.js
@@ -1,4 +1,73 @@
-function setAlarm() {}
+// Constants for time conversion
+const SECONDS_PER_MINUTE = 60;
+const MILLISECONDS_PER_SECOND = 1000;
+
+let intervalId;
+
+/**
+ * Formats time in seconds to MM:SS format
+ */
+function formatTimeDisplay(totalSeconds) {
+ const minutes = Math.floor(totalSeconds / SECONDS_PER_MINUTE);
+ const seconds = totalSeconds % SECONDS_PER_MINUTE;
+
+ return (
+ "Time Remaining: " +
+ String(minutes).padStart(2, "0") +
+ ":" +
+ String(seconds).padStart(2, "0")
+ );
+}
+
+function setAlarm() {
+ const input = document.getElementById("alarmSet");
+ const heading = document.getElementById("timeRemaining");
+ const errorMsg = document.getElementById("alarmError");
+
+ // Reset alarm sound + flashing background before new countdown
+ pauseAlarm();
+
+ let raw = input.value.trim();
+
+ // Clear previous error
+ errorMsg.textContent = "";
+
+ // STRONG VALIDATION: must be digits only
+ if (!/^\d+$/.test(raw)) {
+ heading.innerText = "Time Remaining: 00:00";
+ errorMsg.textContent =
+ "Invalid input. Please enter a whole number of seconds (e.g., 10, 30, 120). Decimals and text are not allowed.";
+ return;
+ }
+
+ let totalSeconds = Number(raw);
+
+ // Prevent extremely large or zero values
+ if (totalSeconds === 0 || totalSeconds > 86400) {
+ heading.innerText = "Time Remaining: 00:00";
+ errorMsg.textContent =
+ "Please enter a value between 1 and 86,400 seconds. Examples: 10, 45, 300.";
+ return;
+ }
+
+ // Reset any existing countdown
+ clearInterval(intervalId);
+
+ heading.innerText = formatTimeDisplay(totalSeconds);
+
+ intervalId = setInterval(() => {
+ totalSeconds--;
+
+ if (totalSeconds <= 0) {
+ heading.innerText = formatTimeDisplay(0);
+ clearInterval(intervalId);
+ playAlarm();
+ return;
+ }
+
+ heading.innerText = formatTimeDisplay(totalSeconds);
+ }, MILLISECONDS_PER_SECOND);
+}
// DO NOT EDIT BELOW HERE
@@ -12,14 +81,21 @@ function setup() {
document.getElementById("stop").addEventListener("click", () => {
pauseAlarm();
});
+
+ // Allow Enter key to trigger alarm
+ document.getElementById("alarmSet").addEventListener("keyup", (e) => {
+ if (e.key === "Enter") setAlarm();
+ });
}
function playAlarm() {
audio.play();
+ document.body.classList.add("alarm-active");
}
function pauseAlarm() {
audio.pause();
+ document.body.classList.remove("alarm-active");
}
window.onload = setup;
diff --git a/Sprint-3/alarmclock/index.html b/Sprint-3/alarmclock/index.html
index 48e2e80d9..6f0c4797a 100644
--- a/Sprint-3/alarmclock/index.html
+++ b/Sprint-3/alarmclock/index.html
@@ -4,17 +4,42 @@
- Title here
+ Alarm clock app
+
-
-
Time Remaining: 00:00
-
-
+
+
+ Time Remaining: 00:00
+
+
+
+
+
+
+
+
+
+
+
+
+
-
-
-