Cropper.js example

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8,683 Kb
Views
62,744

How do I make an cropper.js example?

Cropper.js is an image uploading and cropping tool that can easily be added to your website.. What is a cropper.js example? How do you make a cropper.js example? This script and codes were developed by Billy Brown on 30 September 2022, Friday.

Cropper.js example Previews

Cropper.js example - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>cropper.js example</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <label class="img-upload-label"> Upload Image: <input type="file" class="js-fileinput img-upload" accept="image/jpeg,image/png,image/gif">
</label>
<button class="js-export img-export">Export</button>
<canvas class="js-editorcanvas"></canvas>
<canvas class="js-previewcanvas"></canvas> <script src="js/index.js"></script>
</body>
</html>

Cropper.js example - Script Codes CSS Codes

html,
input { box-sizing: border-box; font-family: Helvetica, sans-serif;
}
* { box-sizing: inherit;
}
.hidden { display: none;
}
.img-export { display: block;
}

Cropper.js example - Script Codes JS Codes

'use strict';
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
/** * @file Allows uploading, cropping (with automatic resizing) and exporting * of images. * @author Billy Brown * @license MIT * @version 2.1.0 */
/** Class used for uploading images. */
var Uploader = function () { /** * <p>Creates an Uploader instance with parameters passed as an object.</p> * <p>Available parameters are:</p> * <ul> * <li>exceptions {function}: the exceptions handler to use, function that takes a string.</li> * <li>input {HTMLElement} (required): the file input element. Instantiation fails if not provided.</li> * <li>types {array}: the file types accepted by the uploader.</li> * </ul> * * @example * var uploader = new Uploader({ * input: document.querySelector('.js-fileinput'), * types: [ 'gif', 'jpg', 'jpeg', 'png' ] * }); * * * @param {object} options the parameters to be passed for instantiation */ function Uploader(options) { _classCallCheck(this, Uploader); if (!options.input) { throw '[Uploader] Missing input file element.'; } this.fileInput = options.input; this.types = options.types || ['gif', 'jpg', 'jpeg', 'png']; } /** * Listen for an image file to be uploaded, then validate it and resolve with the image data. */ Uploader.prototype.listen = function listen(resolve, reject) { var _this = this; this.fileInput.onchange = function (e) { // Do not submit the form e.preventDefault(); // Make sure one file was selected if (!_this.fileInput.files || _this.fileInput.files.length !== 1) { reject('[Uploader:listen] Select only one file.'); } var file = _this.fileInput.files[0]; var reader = new FileReader(); // Make sure the file is of the correct type if (!_this.validFileType(file.type)) { reject('[Uploader:listen] Invalid file type: ' + file.type); } else { // Read the image as base64 data reader.readAsDataURL(file); // When loaded, return the file data reader.onload = function (e) { return resolve(e.target.result); }; } }; }; /** @private */ Uploader.prototype.validFileType = function validFileType(filename) { // Get the second part of the MIME type var extension = filename.split('/').pop().toLowerCase(); // See if it is in the array of allowed types return this.types.includes(extension); }; return Uploader;
}();
function squareContains(square, coordinate) { return coordinate.x >= square.pos.x && coordinate.x <= square.pos.x + square.size.x && coordinate.y >= square.pos.y && coordinate.y <= square.pos.y + square.size.y;
}
/** Class for cropping an image. */
var Cropper = function () { /** * <p>Creates a Cropper instance with parameters passed as an object.</p> * <p>Available parameters are:</p> * <ul> * <li>size {object} (required): the dimensions of the cropped, resized image. Must have 'width' and 'height' fields. </li> * <li>limit {integer}: the longest side that the cropping area will be limited to, resizing any larger images.</li> * <li>canvas {HTMLElement} (required): the cropping canvas element. Instantiation fails if not provided.</li> * <li>preview {HTMLElement} (required): the preview canvas element. Instantiation fails if not provided.</li> * </ul> * * @example * var editor = new Cropper({ * size: { width: 128, height: 128 }, * limit: 600, * canvas: document.querySelector('.js-editorcanvas'), * preview: document.querySelector('.js-previewcanvas') * }); * * @param {object} options the parameters to be passed for instantiation */ function Cropper(options) { _classCallCheck(this, Cropper); // Check the inputs if (!options.size) { throw 'Size field in options is required'; } if (!options.canvas) { throw 'Could not find image canvas element.'; } if (!options.preview) { throw 'Could not find preview canvas element.'; } // Hold on to the values this.imageCanvas = options.canvas; this.previewCanvas = options.preview; this.c = this.imageCanvas.getContext("2d"); // Images larger than options.limit are resized this.limit = options.limit || 600; // default to 600px // Create the cropping square with the handle's size this.crop = { size: { x: options.size.width, y: options.size.height }, pos: { x: 0, y: 0 }, handleSize: 10 }; // Set the preview canvas size this.previewCanvas.width = options.size.width; this.previewCanvas.height = options.size.height; // Bind the methods, ready to be added and removed as events this.boundDrag = this.drag.bind(this); this.boundClickStop = this.clickStop.bind(this); } /** * Set the source image data for the cropper. * * @param {String} source the source of the image to crop. */ Cropper.prototype.setImageSource = function setImageSource(source) { var _this2 = this; this.image = new Image(); this.image.src = source; this.image.onload = function (e) { // Perform an initial render _this2.render(); // Listen for events on the canvas when the image is ready _this2.imageCanvas.onmousedown = _this2.clickStart.bind(_this2); }; }; /** * Export the result to a given image tag. * * @param {HTMLElement} img the image tag to export the result to. */ Cropper.prototype.export = function _export(img) { img.setAttribute('src', this.previewCanvas.toDataURL()); }; /** @private */ Cropper.prototype.render = function render() { this.c.clearRect(0, 0, this.imageCanvas.width, this.imageCanvas.height); this.displayImage(); this.preview(); this.drawCropWindow(); }; /** @private */ Cropper.prototype.clickStart = function clickStart(e) { // Get the click position and hold onto it for the expected mousemove var position = { x: e.offsetX, y: e.offsetY }; this.lastEvent = { position: position, resizing: this.isResizing(position), moving: this.isMoving(position) }; // Listen for mouse movement and mouse release this.imageCanvas.addEventListener('mousemove', this.boundDrag); this.imageCanvas.addEventListener('mouseup', this.boundClickStop); }; /** @private */ Cropper.prototype.clickStop = function clickStop(e) { // Stop listening for mouse movement and mouse release this.imageCanvas.removeEventListener("mousemove", this.boundDrag); this.imageCanvas.removeEventListener("mouseup", this.boundClickStop); }; /** @private */ Cropper.prototype.isResizing = function isResizing(coord) { var size = this.crop.handleSize; var handle = { pos: { x: this.crop.pos.x + this.crop.size.x - size / 2, y: this.crop.pos.y + this.crop.size.y - size / 2 }, size: { x: size, y: size } }; return squareContains(handle, coord); }; /** @private */ Cropper.prototype.isMoving = function isMoving(coord) { return squareContains(this.crop, coord); }; /** @private */ Cropper.prototype.drag = function drag(e) { var position = { x: e.offsetX, y: e.offsetY }; // Calculate the distance that the mouse has travelled var dx = position.x - this.lastEvent.position.x; var dy = position.y - this.lastEvent.position.y; // Determine whether we are resizing, moving, or nothing if (this.lastEvent.resizing) { this.resize(dx, dy); } else if (this.lastEvent.moving) { this.move(dx, dy); } // Update the last position this.lastEvent.position = position; this.render(); }; /** @private */ Cropper.prototype.resize = function resize(dx, dy) { var handle = { x: this.crop.pos.x + this.crop.size.x, y: this.crop.pos.y + this.crop.size.y }; // Maintain the aspect ratio var amount = Math.abs(dx) > Math.abs(dy) ? dx : dy; // Make sure that the handle remains within image bounds if (this.inBounds(handle.x + amount, handle.y + amount)) { this.crop.size.x += amount; this.crop.size.y += amount; } }; /** @private */ Cropper.prototype.move = function move(dx, dy) { // Get the opposing coordinates var tl = { x: this.crop.pos.x, y: this.crop.pos.y }; var br = { x: this.crop.pos.x + this.crop.size.x, y: this.crop.pos.y + this.crop.size.y }; // Make sure they are in bounds if (this.inBounds(tl.x + dx, tl.y + dy) && this.inBounds(br.x + dx, tl.y + dy) && this.inBounds(br.x + dx, br.y + dy) && this.inBounds(tl.x + dx, br.y + dy)) { this.crop.pos.x += dx; this.crop.pos.y += dy; } }; /** @private */ Cropper.prototype.displayImage = function displayImage() { // Resize the original to the maximum allowed size var ratio = this.limit / Math.max(this.image.width, this.image.height); this.image.width *= ratio; this.image.height *= ratio; // Fit the image to the canvas this.imageCanvas.width = this.image.width; this.imageCanvas.height = this.image.height; this.c.drawImage(this.image, 0, 0, this.image.width, this.image.height); }; /** @private */ Cropper.prototype.drawCropWindow = function drawCropWindow() { var pos = this.crop.pos; var size = this.crop.size; var radius = this.crop.handleSize / 2; this.c.strokeStyle = 'red'; this.c.fillStyle = 'red'; // Draw the crop window outline this.c.strokeRect(pos.x, pos.y, size.x, size.y); // Draw the draggable handle var path = new Path2D(); path.arc(pos.x + size.x, pos.y + size.y, radius, 0, Math.PI * 2, true); this.c.fill(path); }; /** @private */ Cropper.prototype.preview = function preview() { var pos = this.crop.pos; var size = this.crop.size; // Fetch the image data from the canvas var imageData = this.c.getImageData(pos.x, pos.y, size.x, size.y); if (!imageData) { return false; } // Prepare and clear the preview canvas var ctx = this.previewCanvas.getContext('2d'); ctx.clearRect(0, 0, this.previewCanvas.width, this.previewCanvas.height); // Draw the image to the preview canvas, resizing it to fit ctx.drawImage(this.imageCanvas, // Top left corner coordinates of image pos.x, pos.y, // Width and height of image size.x, size.y, // Top left corner coordinates of result in canvas 0, 0, // Width and height of result in canvas this.previewCanvas.width, this.previewCanvas.height); }; /** @private */ Cropper.prototype.inBounds = function inBounds(x, y) { return squareContains({ pos: { x: 0, y: 0 }, size: { x: this.imageCanvas.width, y: this.imageCanvas.height } }, { x: x, y: y }); }; return Cropper;
}();
function exceptionHandler(message) { console.log(message);
}
// Auto-resize the cropped image
var dimensions = { width: 128, height: 128 };
try { var uploader = new Uploader({ input: document.querySelector('.js-fileinput'), types: ['gif', 'jpg', 'jpeg', 'png'] }); var editor = new Cropper({ size: dimensions, canvas: document.querySelector('.js-editorcanvas'), preview: document.querySelector('.js-previewcanvas') }); // Make sure both were initialised correctly if (uploader && editor) { // Start the uploader, which will launch the editor uploader.listen(editor.setImageSource.bind(editor), function (error) { throw error; }); } // Allow the result to be exported as an actual image var img = document.createElement('img'); document.body.appendChild(img); document.querySelector('.js-export').onclick = function (e) { return editor.export(img); };
} catch (error) { exceptionHandler(error.message);
}
Cropper.js example - Script Codes
Cropper.js example - Script Codes
Home Page Home
Developer Billy Brown
Username _Billy_Brown
Uploaded September 30, 2022
Rating 3
Size 8,683 Kb
Views 62,744
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