<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <title>Cropper.js</title> <link rel="stylesheet" href="../dist/cropper.css"> <style> .container { max-width: 640px; margin: 20px auto; } img { max-width: 100%; } </style> </head> <body> <div class="container"> <h1>Crop on canvas with Cropper</h1> <h3>Image</h3> <div class="img-container"> <img id="image" src="../docs/images/picture.jpg" alt="Picture"> </div> <h3>Canvas</h3> <div class="img-container"> <canvas id="canvas"></canvas> </div> </div> <script src="../dist/cropper.js"></script> <script> function start() { var width = this.offsetWidth; var height = this.offsetHeight; var cropper; canvas.width = width; canvas.height = height; canvas.getContext('2d').drawImage( this, 0, 0, this.naturalWidth, this.naturalHeight, 0, 0, width, height ); cropper = new Cropper(canvas); } window.addEventListener('DOMContentLoaded', function () { var canvas = document.getElementById('canvas'); var image = document.getElementById('image'); if (image.complete) { start.call(image); } else { image.onload = start; } }); </script> </body> </html>