Coded a replica of Stripes follow along nav.

ccalbaugh · ccalbaugh · commit e89b578eb964 · 2017-01-16T12:14:09.000-06:00
diff --git a/26 - Stripe Follow Along Nav/index-START.html b/26 - Stripe Follow Along Nav/index-START.html
@@ -134,8 +134,6 @@ <h2>Cool</h2>
     opacity: 1;
   }
 
-
-
   .dropdownBackground {
     width:100px;
     height:100px;
@@ -208,6 +206,39 @@ <h2>Cool</h2>
 </style>
 
 <script>
+  const triggers = document.querySelectorAll('.cool > li');
+  const background = document.querySelector('.dropdownBackground');
+  const nav = document.querySelector('.top');
+
+  function handleEnter() {
+    this.classList.add('trigger-enter');
+    setTimeout(() => this.classList.add('trigger-enter-active'), 150);
+    background.classList.add('open');
+
+    const dropdown = this.querySelector('.dropdown');
+    const dropdownCoords = dropdown.getBoundingClientRect();
+    const navCoords = nav.getBoundingClientRect();
+    console.log(dropdownCoords);
+
+    const coords = {
+      height: dropdownCoords.height,
+      width: dropdownCoords.width,
+      top: dropdownCoords.top - navCoords.top,
+      left: dropdownCoords.left - navCoords.left,
+    };
+
+    background.style.setProperty('width', `${coords.width}px`);
+    background.style.setProperty('height', `${coords.height}px`);
+    background.style.setProperty('transform', `translate(${coords.left}px, ${coords.top}px)`);
+  }
+
+  function handleLeave() {
+    this.classList.remove('trigger-enter', 'trigger-enter-active');
+    background.classList.remove('open');
+  }
+
+  triggers.forEach(trigger => trigger.addEventListener('mouseenter', handleEnter));
+  triggers.forEach(trigger => trigger.addEventListener('mouseleave', handleLeave));
 </script>
 
 </body>
