ezcrop

Javascript image crop tool with zooming and rotating.

Ezcrop is a Vanilla JavaScript version of jQuery Cropit plugin by Scott Cheng.

Features

• Selecting images from filesystem
• Zooming
• Moving
• Rotating
• Cropping
• Export to data URI

Installation

# Install ezcrop with bower
$ bower install ezcrop

# or with npm
$ npm install ezcrop

Usage

Add ezcrop.js to the page.

<script src="dist/ezcrop.js"></script>

And the required bit of HTML:

<div id="image-cropper">
    <div class="ezcrop-preview"></div>
    <input type="file" class="ezcrop-image-input">
    <div class="image-size-label">
      Resize image
    </div>
    <input type="range" class="ezcrop-image-zoom-input">
    <button id="rotate-ccw" class="rotate-ccw">Rotate counterclockwise</button>
    <button id="rotate-cw" class="rotate-cw">Rotate clockwise</button>

    <button id="export" class="export">Export</button>
</div>

Initialize

<script>
  (function() {
    var cropper = new ezcrop(document.getElementById('image-cropper'), {
      imageState: {
        src: 'images/hands.jpg', // start with a default image
      },
    });

    document.getElementById('rotate-ccw').addEventListener('click', function() {
      cropper.rotateCCW();
    });

    document.getElementById('rotate-cw').addEventListener('click', function() {
      cropper.rotateCW();
    });

    document.getElementById('export').addEventListener('click', function() {
      var imageData = cropper.getCroppedImageData();
      window.open(imageData);
    });
  })();
</script>

Options

Following options are supported:

Option	Type	Description	Default
preview	object	The HTML element that displays image preview.
fileInput	object	File input element.
zoomSlider	object	Range input element that controls image zoom.
width	number	Width of image preview in pixels. If set, it will override the CSS property.	null
height	number	Height of image preview in pixels. If set, it will override the CSS property.	null
imageBackground	boolean	Whether or not to display the background image beyond the preview area.	false
imageBackgroundBorderWidth	array or number	Width of background image border in pixels.,The four array elements specify the width of background image width on the top, right, bottom, left side respectively.,The background image beyond the width will be hidden.,If specified as a number, border with uniform width on all sides will be applied.	[0, 0, 0, 0]
exportZoom	number	The ratio between the desired image size to export and the preview size.,For example, if the preview size is 300px * 200px, and exportZoom = 2, then,the exported image size will be 600px * 400px.,This also affects the maximum zoom level, since the exported image cannot be zoomed to larger than its original size.	1
allowDragNDrop	boolean	When set to true, you can load an image by dragging it from local file browser onto the preview area.	true
minZoom	string	This options decides the minimal zoom level of the image.,If set to 'fill', the image has to fill the preview area, i.e. both width and height must not go smaller than the preview area.,If set to 'fit', the image can shrink further to fit the preview area, i.e. at least one of its edges must not go smaller than the preview area.	fill
maxZoom	number	Determines how big the image can be zoomed. E.g. if set to 1.5, the image can be zoomed to 150% of its original size.	1
initialZoom	string	Determines the zoom when an image is loaded.,When set to 'min', image is zoomed to the smallest when loaded.,When set to 'image'`, image is zoomed to 100% when loaded.	min
freeMove	boolean	When set to true, you can freely move the image instead of being bound to the container borders.	false
smallImage	string	When set to 'reject', onImageError would be called when ezcrop loads an image that is smaller than the container.,When set to 'allow', images smaller than the container can be zoomed down to its original size, overiding minZoom option.,When set to 'stretch', the minimum zoom of small images would follow minZoom option.	reject

Callbacks

Following callbacks can be used to interact with ezcrop.

Callback	Description
onFileChange(event)	Called when user selects a file in the select file input.
onFileReaderError	Called when FileReader encounters an error while loading the image file.
onImageLoading	Called when image starts to be loaded.
onImageLoaded	Called when image is loaded.
onImageError(error)	Called when image cannot be loaded.
onZoomEnabled	Called when image the zoom slider is enabled.
onZoomDisabled	Called when image the zoom slider is disabled.
onZoomChange(zoom)	Called when zoom changes.
onOffsetChange(offset)	Called when image offset changes.

Development

• Build: webpack
  • Watch for changes and rebuild: webpack -w
• Test: npm test
  • Test specific file: jest <filename>
• Lint: npm run jshint -s

License

MIT