ng-file-upload

<script src="angular.min.js"></script>
<!-- shim is needed to support non-HTML5 FormData browsers (IE8-9)-->
<script src="ng-file-upload-shim.min.js"></script>
<script src="ng-file-upload.min.js"></script>

Upload on form submit or button click
<form ng-app="fileUpload" ng-controller="MyCtrl" name="form">
  Single Image with validations
  <div class="button" ngf-select ng-model="file" name="file" ngf-pattern="'image/*'"
    ngf-accept="'image/*'" ngf-max-size="20MB" ngf-min-height="100" 
    ngf-resize="{ 100, height: 100}">Select</div>
  Multiple files
  <div class="button" ngf-select ng-model="files" ngf-multiple="true">Select</div>
  Drop files: <div ngf-drop ng-model="files" class="drop-box">Drop</div>
  <button type="submit" ng-click="submit()">submit</button>
</form>

Upload right away after file selection:
<div class="button" ngf-select="upload($file)">Upload on file select</div>
<div class="button" ngf-select="uploadFiles($files)" multiple="multiple">Upload on file select</div>
  Drop File:
<div ngf-drop="uploadFiles($files)" class="drop-box"
  ngf-drag-over-class="'dragover'" ngf-multiple="true" 
  ngf-pattern="'image/*,application/pdf'">Drop Images or PDFs files here</div>
<div ngf-no-file-drop>File Drag/Drop is not supported for this browser</div>

Image thumbnail: <img ngf-thumbnail="file || '/thumb.jpg'">
Audio preview: <audio controls ngf-src="file"></audio>
Video preview: <video controls ngf-src="file"></video>

Javascript code:

//inject directives and services.
var app = angular.module('fileUpload', ['ngFileUpload']);

app.controller('MyCtrl', ['$scope', 'Upload', function ($scope, Upload) {
    // upload later on form submit or something similar
    $scope.submit = function() {
      if (form.file.$valid && $scope.file) {
        $scope.upload($scope.file);
      }
    };

    // upload on file select or drop
    $scope.upload = function (file) {
        Upload.upload({
            url: 'upload/url',
            data: {file: file, 'username': $scope.username}
        }).then(function (resp) {
            console.log('Success ' + resp.config.data.file.name + 'uploaded. Response: ' + resp.data);
        }, function (resp) {
            console.log('Error status: ' + resp.status);
        }, function (evt) {
            var progressPercentage = parseInt(100.0 * evt.loaded / evt.total);
            console.log('progress: ' + progressPercentage + '% ' + evt.config.data.file.name);
        });
    };
    // for multiple files:
    $scope.uploadFiles = function (files) {
      if (files && files.length) {
        for (var i = 0; i < files.length; i++) {
          Upload.upload({..., data: {file: files[i]}, ...})...;
        }
        // or send them all together for HTML5 browsers:
        Upload.upload({..., data: {file: files}, ...})...;
      }
    }
}]);