GUAC-963: Add directive for selecting files for upload via arbitrary elements.

guacamole/src/main/webapp/app/element/directives/guacUpload.js

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2014 Glyptodon LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * A directive which allows multiple files to be uploaded. Clicking on the
+ * associated element will result in a file selector dialog, which then calls
+ * the provided callback function with any chosen files.
+ */
+angular.module('element').directive('guacUpload', ['$document', function guacUpload($document) {
+
+    return {
+        restrict: 'A',
+
+        link: function linkGuacUpload($scope, $element, $attrs) {
+
+            /**
+             * Angular expression which evaluates to the function to call
+             * whenever files are chosen. The callback is provided a single
+             * parameter: the FileList containing all chosen files.
+             *
+             * @type String 
+             */
+            var guacUpload = $attrs.guacUpload;
+
+            /**
+             * The element which will register the drag gesture.
+             *
+             * @type Element
+             */
+            var element = $element[0];
+
+            /**
+             * Internal form, containing a single file input element.
+             *
+             * @type HTMLFormElement
+             */
+            var form = $document[0].createElement('form');
+
+            /**
+             * Internal file input element.
+             *
+             * @type HTMLInputElement
+             */
+            var input = $document[0].createElement('input');
+
+            // Init input element
+            input.type = 'file';
+            input.multiple = true;
+
+            // Add input element to internal form
+            form.appendChild(input);
+
+            // Notify of any chosen files
+            input.addEventListener('change', function filesSelected() {
+                $scope.$apply(function setSelectedFiles() {
+
+                    var callback = $scope.$eval(guacUpload);
+
+                    // Only set chosen files selection is not canceled
+                    if (callback && input.files.length > 0)
+                        callback(input.files);
+
+                    // Reset selection
+                    form.reset();
+
+                });
+            });
+
+            // Open file chooser when element is clicked
+            element.addEventListener('click', function elementClicked() {
+                input.click();
+            });
+
+        } // end guacUpload link function
+
+    };
+
+}]);