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Selecting Multiple Images in a PhoneGap/Cordova App

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Selecting Multiple Images in a PhoneGap/Cordova App

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A few days ago a reader asked me an interesting question: How can you select more than one image at a time in a PhoneGap/Cordova application? I did a bit of digging and came up with three different options for handling this. There are probably more, and if you would like to share how you’ve done it, please let me a comment below.

Option One – Camera API

The Camera API only lets you select one image at a time, so it may seem like it isn’t a viable solution, but if your code simply keeps track of a list of selections, it may be an option. The user would need to click some button one time for each image they want to use, but depending on your use-case, that may be ok. For example, when I post a picture to Facebook, even though I can post multiple images, I can’t honestly remember the last time I did. If Facebook only let me select one existing picture at a time, it wouldn’t bother me at all, and that may work fine for your application too.

As an example of this, I created a simple Ionic application that lets you select an image. Every time you select an image, it gets added to a list that is rendered on screen. Here is the controller code I used to handle this:

angular.module('appControllers', [])




.controller('HomeCtrl', ['$scope', '$rootScope', '$cordovaCamera', function($scope, $rootScope, $cordovaCamera) {




$scope.ready = false;
$scope.images = [];

$rootScope.$watch('appReady.status', function() {
console.log('watch fired '+$rootScope.appReady.status);
if($rootScope.appReady.status) $scope.ready = true;
});

$scope.selImages = function() {

var options = {
quality: 50,
destinationType: Camera.DestinationType.FILE_URI,
sourceType: Camera.PictureSourceType.PHOTOLIBRARY,
targetWidth: 200,
targetHeight: 200
};




$cordovaCamera.getPicture(options).then(function(imageUri) {
console.log('img', imageUri);
$scope.images.push(imageUri);

}, function(err) {
// error
});




};

}])

Here is an awesome animated gif of this in action:

anim1

Obviously this would be tied to a form process of some sort. You would use the array of images as values with the FileTransfer plugin to send them to your server.

You can view the full source code for this version here: https://github.com/cfjedimaster/Cordova-Examples/tree/master/multiimageselect/multiimageselect1.

Option Two – Media-Capture API

Another option to consider would be the media capture plugin. I don’t use this terribly often and I tend to forget that it supports camera images as well. With this plugin, you can request multiple camera images. However, it doesnot support existing pictures – the user must take new pictures. Also, the user experience is pretty horrible. As I said, I don’t use this terribly often and in my testing it wasn’t obvious how you stopped the picture taking process. I had to click the device’s back button (I only tested this one on Android) to get out of the picture taking cycle and on more than one occasion I accidentally closed the app.

So as I said, this is probably not what I’d use – but it is an option. Here’s the controller code updated to make use of that plugin:

angular.module('appControllers', [])




.controller('HomeCtrl', ['$scope', '$rootScope', '$cordovaCapture', function($scope, $rootScope, $cordovaCapture) {




$scope.ready = false;
$scope.images = [];

$rootScope.$watch('appReady.status', function() {
console.log('watch fired '+$rootScope.appReady.status);
if($rootScope.appReady.status) $scope.ready = true;
});

$scope.selImages = function() {

var options = {
limit: 10
};




$cordovaCapture.captureImage(options).then(function(results) {
for (var i = 0; i < results.length; i++) {
$scope.images.push(results[i].fullPath);
}
if(!$scope.$$phase) {
$scope.$apply();
}
}, function(err) {
console.log('err');
console.log(err);
// error
});




};

}])

You can view this version here: https://github.com/cfjedimaster/Cordova-Examples/tree/master/multiimageselect/multiimageselect3

Option Three – cordova-imagePicker

For the final – and probably best option there is the cordova-imagePicker plugin. This plugin does pretty much exactly what the reader wanted – letting you select multiple images. It has a incredibly simple API allowing for a maximum number of pictures and automatic resizing/quality changes too. Here’s how the code works with the defaults:

angular.module('appControllers', [])




.controller('HomeCtrl', ['$scope', '$rootScope', '$cordovaCamera', function($scope, $rootScope, $cordovaCamera) {




$scope.ready = false;
$scope.images = [];

$rootScope.$watch('appReady.status', function() {
console.log('watch fired '+$rootScope.appReady.status);
if($rootScope.appReady.status) $scope.ready = true;
});




$scope.selImages = function() {

window.imagePicker.getPictures(
function(results) {
for (var i = 0; i < results.length; i++) {
console.log('Image URI: ' + results[i]);
$scope.images.push(results[i]);
}
if(!$scope.$$phase) {
$scope.$apply();
}
}, function (error) {
console.log('Error: ' + error);
}
);




};

}])

And here it is in action:

Untitled2

Honestly, this seems like the best option. You can see the full source code for this version here:https://github.com/cfjedimaster/Cordova-Examples/tree/master/multiimageselect/multiimageselect2

(As a quick aside, yes, the numbers at the end of each folder don’t match the order I did here. The media-capture example is multiimageselect3 and the nicer multi select plugin one is folder 2. Sorry if that’s confusing – I just built them in a different order than how I wrote them up.)

As always – I’m curious about how people may have solved this problem in their own PhoneGap/Cordova projects. Please share your ideas below!

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Topics:
java ,mobile ,phonegap ,cordova

Published at DZone with permission of Raymond Camden, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

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