Using CSS variables

Narahari-Sundaragopalan · Narahari-Sundaragopalan · commit 307e52eb6df7 · 2018-05-12T01:38:26.000-05:00
diff --git a/CSS-JS/index.html b/CSS-JS/index.html
@@ -0,0 +1,79 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+  <meta charset="UTF-8">
+  <title>Scoped CSS variables and JS</title>
+</head>
+
+<body>
+  <h2>Update CSS variables with
+    <span class="hl">JS</span>
+  </h2>
+  <div class="controls">
+    <label for="spacing">
+      Spacing!
+    </label>
+    <input id="spacing" type="range" name="spacing" min="10" max="200" value="10" data-sizing="px">
+
+    <label for="blur">
+      Blur!
+    </label>
+    <input id="blur" type="range" name="blur" min="0" max="25" value="10" data-sizing="px">
+
+    <label for="base">Base Color</label>
+    <input id="base" type="color" name="base" value="#ffc600">
+  </div>
+
+  <img src="https://source.unsplash.com/7bwQXzbF6KE/800x500">
+
+  <style>
+
+    :root{
+      --base: #ffc600;
+      --spacing: 10px;
+      --blur: 10px;
+    }
+
+    img {
+      padding: var(--spacing);
+      background: var(--base);
+      filter: blur(var(--blur));
+    }
+
+    .hl{
+      color: var(--base);
+    }
+
+    body {
+      text-align: center;
+      background: #193549;
+      color: white;
+      font-family: 'helvetica neue', sans-serif;
+      font-weight: 100;
+      font-size: 50px;
+    }
+
+    .controls {
+      margin-bottom: 50px;
+    }
+    input {
+      width:100px;
+    }
+  </style>
+
+  <script>
+    const inputs = document.querySelectorAll(".controls input");
+
+    function handleUpdate() {
+      // All properties with data- keyword in the html tags 
+      // come under datasets object
+      const suffix = this.dataset.sizing || '';
+      document.documentElement.style.setProperty(`--${this.name}`, this.value + suffix);
+    }
+
+    inputs.forEach(input => input.addEventListener('change', handleUpdate));
+    inputs.forEach(input => input.addEventListener('mousemove', handleUpdate));
+  </script>
+</body>
+</html>
