ng-img-crop-npm

v0.3.2

Published

2 years ago

Image crop directive for AngularJS

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herpiko

ngImgCrop

Simple Image Crop directive for AngularJS. Enables to crop a circle or a square out of an image.

Screenshots

Circle Crop

Square Crop

Live demo

Live demo on JSFiddle

Requirements

AngularJS
Modern Browser supporting

Installing

Download

You have two options to get the files:

Download ngImgCrop files from GitHub.
Use Bower to download the files. Just run bower install ngImgCrop.

Add files

Add the scripts to your application. Make sure the ng-img-crop.js file is inserted after the angular.js library:

<script src="angular.js"></script>
<script src="ng-img-crop.js"></script>
<link rel="stylesheet" type="text/css" href="ng-img-crop.css">

Add a dependancy

Add the image crop module as a dependancy to your application module:

var myAppModule = angular.module('MyApp', ['ngImgCrop']);

Usage

Add the image crop directive <img-crop> to the HTML file where you want to use an image crop control. Note: a container, you place the directive to, should have some pre-defined size (absolute or relative to its parent). That's required, because the image crop control fits the size of its container.
Bind the directive to a source image property (using image="" option). The directive will read the image data from that property and watch for updates. The property can be a url to an image, or a data uri.
Bind the directive to a result image property (using result-image="" option). On each update, the directive will put the content of the crop area to that property in the data uri format.
Set up the options that make sense to your application.
Done!

Result image

The result image will always be a square for the both circle and square area types. It's highly recommended to store the image as a square on your back-end, because this will enable you to easily update your pics later, if you decide to implement some design changes. Showing a square image as a circle on the front-end is not a problem - it is as easy as adding a border-radius style for that image in a css.

Example code

The following code enables to select an image using a file input and crop it. The cropped image data is inserted into img each time the crop area updates.

<html>
<head>
  <script src="angular.js"></script>
  <script src="ng-img-crop.js"></script>
  <link rel="stylesheet" type="text/css" href="ng-img-crop.css">
  <style>
    .cropArea {
      background: #E4E4E4;
      overflow: hidden;
      width:500px;
      height:350px;
    }
  </style>
  <script>
    angular.module('app', ['ngImgCrop'])
      .controller('Ctrl', function($scope) {
        $scope.myImage='';
        $scope.myCroppedImage='';

        var handleFileSelect=function(evt) {
          var file=evt.currentTarget.files[0];
          var reader = new FileReader();
          reader.onload = function (evt) {
            $scope.$apply(function($scope){
              $scope.myImage=evt.target.result;
            });
          };
          reader.readAsDataURL(file);
        };
        angular.element(document.querySelector('#fileInput')).on('change',handleFileSelect);
      });
  </script>
</head>
<body ng-app="app" ng-controller="Ctrl">
  <div>Select an image file: <input type="file" id="fileInput" /></div>
  <div class="cropArea">
    <img-crop image="myImage" result-image="myCroppedImage"></img-crop>
  </div>
  <div>Cropped Image:</div>
  <div><img ng-src="{{myCroppedImage}}" /></div>
</body>
</html>

Options

<img-crop
    image="{string}"
    result-image="{string}"
   [change-on-fly="{boolean}"]
   [area-type="{circle|square}"]
   [area-min-size="{number}"]
   [result-image-size="{number}"]
   [result-image-format="{string}"]
   [result-image-quality="{number}"]
   [on-change="{expression}"]
   [on-load-begin="{expression"]
   [on-load-done="{expression"]
   [on-load-error="{expression"]
></img-crop>

image

Assignable angular expression to data-bind to. NgImgCrop gets an image for cropping from it.

result-image

Assignable angular expression to data-bind to. NgImgCrop puts a data uri of a cropped image into it.

change-on-fly

Optional. By default, to reduce CPU usage, when a user drags/resizes the crop area, the result image is only updated after the user stops dragging/resizing. Set true to always update the result image as the user drags/resizes the crop area.

area-type

Optional. Type of the crop area. Possible values: circle|square. Default: circle.

area-min-size

Optional. Min. width/height of the crop area (in pixels). Default: 80.

result-image-size

Optional. Width/height of the result image (in pixels). Default: 200.

result-image-format

Optional. Format of result image. Possible values include image/jpeg, image/png, and image/webp. Browser support varies. Default: image/png.

result-image-quality

Optional. Quality of result image. Possible values between 0.0 and 1.0 inclusive. Default: browser default.

on-change

Optional. Expression to evaluate upon changing the cropped part of the image. The cropped image data is available as $dataURI.

on-load-begin

Optional. Expression to evaluate when the source image starts loading.

on-load-done

Optional. Expression to evaluate when the source image successfully loaded.

on-load-error

Optional. Expression to evaluate when the source image didn't load.

License

See the LICENSE file.