More efficient wesbos#3 session

Author: Madison Dickson

03 - CSS Variables/index-START.html

@@ -25,6 +25,21 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
     /*
       misc styles, nothing to do with CSS variables
     */
+    :root{
+      --spacing: 10px;
+      --blur: 10px;
+      --base: #ffc600;
+    }
+
+    .hl {
+      color: var(--base);
+    }
+
+    img {
+      padding: var(--spacing);
+      background: var(--base);
+      filter: blur(var(--blur));
+    }
 
     body {
       text-align: center;
@@ -45,6 +60,19 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   </style>
 
   <script>
+    document.querySelectorAll('.controls input').forEach(input => {
+      input.addEventListener("change", updateHandler)
+      input.addEventListener("mousedown", e => {
+        //assign single event handler on mousedown
+        input.onmousemove = updateHandler
+      })
+      //remove single event handler on mouseup
+      input.addEventListener("mouseup",  e => (input.onmousemove = null));
+    })
+
+    function updateHandler() {
+      document.documentElement.style.setProperty(`--${this.name}`, this.value + (this.dataset.sizing || '' ));
+    }
   </script>
 
 </body>