how to convert image into base64 string?

Question

hello I am trying to make simple application in ionic using camera or select file from gallery or file system and send to / or upload to a server. I found one plugin which capture one image and send base64 string here is plugin http://ngcordova.com/docs/plugins/camera/ using this I am able to get base64 string

$cordovaCamera.getPicture(options).then(function(imageData) {
      var image = document.getElementById('myImage');
      image.src = "data:image/jpeg;base64," + imageData;
    }, function(err) {
      // error
    });

that base64 string I used to send to server

But my problem is that when I use this plugin image gallary plugin

http://ngcordova.com/docs/plugins/imagePicker/ it send me only image url (where is in memory) .can we get base64 string after selecting the image from image picker.

$cordovaImagePicker.getPictures(options)
    .then(function (results) {
      for (var i = 0; i < results.length; i++) {
        console.log('Image URI: ' + results[i]);
      }
    }, function(error) {
      // error getting photos
    });

In other words when I using camera I am getting base64 string as shown above.But when I use image picker plugin I am getting image url.can I get base64 string .so that I am able to send or upload on server . how to convert image url to base64 string ?

Solution 1

Try this 100% working code. First you have to Download ngCordova.min.js file and include it in your index.html file. Follow this code.

angular.module('starter.controllers', [])

.controller('DashCtrl', function($scope,$cordovaCamera) {
	$scope.imgUrl;
	$scope.dataImg;
	$scope.tackPicture = function(){
	  var options = {
      quality: 50,
      destinationType: Camera.DestinationType.DATA_URL,
      sourceType: Camera.PictureSourceType.CAMERA,
      allowEdit: true,
      encodingType: Camera.EncodingType.JPEG,
      targetWidth: 100,
      targetHeight: 100,
      popoverOptions: CameraPopoverOptions,
      saveToPhotoAlbum: false,
	  correctOrientation:true
    };
	 $cordovaCamera.getPicture(options).then(function(imageData) {
      //var image = document.getElementById('myImage');
	  $scope.dataImg = imageData; // <--- this is your Base64 string 
      $scope.imgUrl = "data:image/jpeg;base64," + imageData;
    }, function(err) {
      // error
    });
	}
})

.controller('ChatsCtrl', function($scope, Chats) {
  // With the new view caching in Ionic, Controllers are only called
  // when they are recreated or on app start, instead of every page change.
  // To listen for when this page is active (for example, to refresh data),
  // listen for the $ionicView.enter event:
  //
  //$scope.$on('$ionicView.enter', function(e) {
  //});

  $scope.chats = Chats.all();
  $scope.remove = function(chat) {
    Chats.remove(chat);
  };
})

.controller('ChatDetailCtrl', function($scope, $stateParams, Chats) {
  $scope.chat = Chats.get($stateParams.chatId);
})

.controller('AccountCtrl', function($scope) {
  $scope.settings = {
    enableFriends: true
  };
});

<ion-view view-title="Dashboard">
  <ion-content class="padding">
   <button class="button icon-left ion-ios-camera button-block button-positive" ng-click="tackPicture()">
   		OPEN CAMERA
   </button>
     <div class="item item-avatar">
    <img ng-src="{{ imgUrl }}">
   
    <p>{{ dataImg }}</p>
  </div>
  </ion-content>
</ion-view>

Solution 2

To convert image to base64 you can use HTML5 canvans as mention in

How to convert image into base64 string using javascript

Please refer above question

Use this code

/**
 * Convert an image 
 * to a base64 url
 * @param  {String}   url         
 * @param  {Function} callback    
 * @param  {String}   [outputFormat=image/png]           
 */
function convertImgToBase64URL(url, callback, outputFormat){
    var img = new Image();
    img.crossOrigin = 'Anonymous';
    img.onload = function(){
        var canvas = document.createElement('CANVAS'),
        ctx = canvas.getContext('2d'), dataURL;
        canvas.height = this.height;
        canvas.width = this.width;
        ctx.drawImage(this, 0, 0);
        dataURL = canvas.toDataURL(outputFormat);
        callback(dataURL);
        canvas = null; 
    };
    img.src = url;
}