Lightweight Javascript ImageCropper 0.1

A lightweight javascript imagecropper written in vanilla js with zero-dependency injection that builds itself into an object.

Getting Started

To get started, you need only do a couple things

Browserify

Include the imagecrop.min.js file into your js build process

Plain old javascript without fancy build ?

Include the imagecrop_regular.min.js file as a link

<script type="text/javascript" src="yourscriptsfolder/imagecrop_regular.min.js"></script>

Creating an imagecropper instance

If you're using browserify Creating an imagecropper is done like so

var ImageCropper = require('./imagecrop.min.js');
img_c = new ImageCropper(selector, image, options);

If you're using plain old javascript without a build process

var img_c = new ImageCropper(selector, image, options);

selector

The selector is an html5 css selector ( such as '#myTestDiv' ), basically anything that works with a querySelector does the job.

It should point to the element where you want the imagecropper to be located.

image

The image can either be a javascript Image object loaded through a FileReader, this can be done like so

var reader = new FileReader();

reader.onload = function (evt) {
  var img_c = new ImageCropper(..., evt.target.result, ...);
};

reader.readAsDataURL(...myfile...);

Or you can simply pass an existing url, for example

var img_c = new ImageCropper(..., '../assets/my_img.jpg', ...);

options

There are several possible options defined for the image cropper

• update
  • Callback function that is called everytime a move/change happens
• max_width
  • Sets the maximum width that the imagecropper can become
• max_height
  • Sets the maximum height for the imagecropper
• min_crop_width
  • The minimum width that the cropped image can be
• min_crop_height
  • The miminum height that the cropped image can be
• create_cb
  • A callback function that is called when the imagecropper has finished creating, this will pass an object containing the dimensions of the imagecropper ( for styling or positioning purposes )
• destroy_cb
  • A callback function that is called when the imagecropper has finished destroying itself
• fixed_size
  • A boolean ( true | false ), that tells the image cropper if it should constrain the size of the cropped area to be fixed or not ?

Cropping an image (mime_type, quality)

When you're all done with your changes, you can crop the image by calling the crop function.

This will return a base64 string that you can then do some funky stuff with.

var img_b64_str = img_c.crop(mime_type, quality);
... // do some funky stuff here

mime_type ( default = 'image/jpeg')

The following mime_types are currently supported in this build, they need to be passed as a string value.

• image/jpeg
• image/png

Quality

The quality is a numeric value between 0 and 1. Where 1 is the highest quality setting, and 0 is the lowest quality setting.

Cleaning up an imagecropper instance

img_c = new ImageCropper('#test-imagecrop', 'img.jpg');
img_c.destroy();

or you can just delete the dom node that the image cropper was created in ( or its parent ), and the imagecropper instance will destroy itself :]

Example

For an example, check out the example folder in the repository