Update index-FINISHED.html

Few tweaks from the tutorial code. Added 'js-' prefix to classes that I used as JS hooks. Also added comments for things I may forget or didn't know.

Author: erikwallace

02 - JS + CSS Clock/index-FINISHED.html

@@ -9,9 +9,9 @@
 
     <div class="clock">
       <div class="clock-face">
-        <div class="hand hour-hand"></div>
-        <div class="hand min-hand"></div>
-        <div class="hand second-hand"></div>
+        <div class="hand  js-hour-hand"></div>
+        <div class="hand  js-minute-hand"></div>
+        <div class="hand  js-second-hand"></div>
       </div>
     </div>
 
@@ -58,41 +58,49 @@
     .hand {
       width:50%;
       height:6px;
-      background:black;
+      background-color: black;
       position: absolute;
       top:50%;
-      transform-origin: 100%;
-      transform: rotate(90deg);
+      transform-origin: 100%; /* make the right end the pivot point of rotation, not the middle (default = 50%) */
+      transform: rotate(90deg); /* flip the hand from horizontal, to vertical pointing at 12:00; */
       transition: all 0.05s;
-      transition-timing-function: cubic-bezier(0.1, 2.7, 0.58, 1);
+      transition-timing-function: ease-in-out; /* helps mimic second hand tick action */
+      z-index: 25;
     }
-</style>
 
-<script>
-  const secondHand = document.querySelector('.second-hand');
-  const minsHand = document.querySelector('.min-hand');
-  const hourHand = document.querySelector('.hour-hand');
-
-  function setDate() {
-    const now = new Date();
-
-    const seconds = now.getSeconds();
-    const secondsDegrees = ((seconds / 60) * 360) + 90;
-    secondHand.style.transform = `rotate(${secondsDegrees}deg)`;
-
-    const mins = now.getMinutes();
-    const minsDegrees = ((mins / 60) * 360) + 90;
-    minsHand.style.transform = `rotate(${minsDegrees}deg)`;
-
-    const hour = now.getHours();
-    const hourDegrees = ((hour / 12) * 360) + 90;
-    hourHand.style.transform = `rotate(${hourDegrees}deg)`;
-  }
+    .js-second-hand {
+      background-color: red;
+      height: 2px;
+      z-index: 10;
+    }
 
-  setInterval(setDate, 1000);
+  </style>
+
+  <script>
+    const secondHand = document.querySelector('.js-second-hand');
+    const minuteHand = document.querySelector('.js-minute-hand');
+    const hourHand = document.querySelector('.js-hour-hand');
+    
+    function setDate() {
+      const now = new Date();
+      const seconds = now.getSeconds();
+      const secondsDegrees = ((seconds / 60) * 360) + 90; /* for every second move the second hand 6 degrees */
+      secondHand.style.transform = `rotate(${secondsDegrees}deg)`; /*  */
+      // console.log('seconds= ' + seconds);
+      
+      const minutes = now.getMinutes();
+      const minutesDegrees = ((minutes / 60) * 360) + 90;
+      minuteHand.style.transform = `rotate(${minutesDegrees}deg)`; 
+      // console.log('minutes= ' + minutes);
+      
+      const hours = now.getHours();
+      const hoursDegrees = ((hours / 12) * 360) + 90;
+      hourHand.style.transform = `rotate(${hoursDegrees}deg)`; 
+      // console.log('hours= ' + hours);
+    }
 
-  setDate();
+    setInterval(setDate, 1000); /* run function every 1 second */
 
-</script>
+  </script>
 </body>
 </html>