Ex27 - Click and drag

fthebaud · fthebaud · commit c808bb9cb30c · 2017-01-18T17:52:19.000+01:00
diff --git a/27 - Click and Drag/index.html b/27 - Click and Drag/index.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <title>Click and Drag</title>
+  <link rel="stylesheet" href="style.css">
+</head>
+<body>
+  <div class="items">
+    <div class="item item1">01</div>
+    <div class="item item2">02</div>
+    <div class="item item3">03</div>
+    <div class="item item4">04</div>
+    <div class="item item5">05</div>
+    <div class="item item6">06</div>
+    <div class="item item7">07</div>
+    <div class="item item8">08</div>
+    <div class="item item9">09</div>
+    <div class="item item10">10</div>
+    <div class="item item11">11</div>
+    <div class="item item12">12</div>
+    <div class="item item13">13</div>
+    <div class="item item14">14</div>
+    <div class="item item15">15</div>
+    <div class="item item16">16</div>
+    <div class="item item17">17</div>
+    <div class="item item18">18</div>
+    <div class="item item19">19</div>
+    <div class="item item20">20</div>
+    <div class="item item21">21</div>
+    <div class="item item22">22</div>
+    <div class="item item23">23</div>
+    <div class="item item24">24</div>
+    <div class="item item25">25</div>
+  </div>
+
+  <script src="script.js" charset="utf-8"></script>
+
+  </body>
+</html>
diff --git a/27 - Click and Drag/script.js b/27 - Click and Drag/script.js
@@ -0,0 +1,32 @@
+'use strict';
+
+const slider = document.querySelector('.items');
+let isDown = false;
+let startX;
+let scrollLeft;
+
+slider.addEventListener('mousedown', (event) => {
+  isDown = true;
+  slider.classList.add('active');
+  startX = event.pageX - slider.offsetLeft;
+  scrollLeft = slider.scrollLeft;
+});
+
+slider.addEventListener('mouseup', () => {
+  isDown = false;
+  slider.classList.remove('active');
+});
+
+slider.addEventListener('mouseleave', () => {
+  isDown = false;
+  slider.classList.remove('active');
+});
+
+slider.addEventListener('mousemove', (event) => {
+  if (!isDown) return; // eslint-disable-line curly
+  //cancels the event without stoping further propagation of the event
+  event.preventDefault(); // prevent the selection of text, etc. inside the element.
+  const x = event.pageX - slider.offsetLeft;
+  const walk = (x - startX) * 2;
+  slider.scrollLeft = scrollLeft - walk;
+});
