Toggle save as for multiple based on selection (no directory) and browser support

filemanager/inc/class.filemanager_ui.inc.php

@@ -125,10 +125,11 @@ class filemanager_ui
 			'saveas' => array(
 				'caption' => lang('Save as'),
 				'group' => $group,
-				'allowOnMultiple' => false,
+				'allowOnMultiple' => true,
 				'icon' => 'filesave',
 				'onExecute' => 'javaScript:app.filemanager.force_download',
 				'disableClass' => 'isDir',
+				'enabled' => 'javaScript:app.filemanager.is_multiple_allowed'
 			),
 			'edit' => array(
 				'caption' => lang('Edit settings'),

filemanager/js/app.js

@@ -477,6 +477,23 @@ app.classes.filemanager = AppJS.extend(
 		return false;
 	},
 
+	/**
+	 * Check to see if the browser supports downloading multiple files
+	 * (using a tag download attribute) to enable/disable the context menu
+	 *
+	 * @param {egwAction} action
+	 * @param {egwActionObject[]} selected
+	 */
+	is_multiple_allowed: function(action, selected)
+	{
+		var allowed = typeof document.createElement('a').download != "undefined";
+		
+		if(typeof action == "undefined") return allowed;
+
+		return (allowed || selected.length <= 1) && action.not_disableClass.apply(action, arguments);
+	},
+
+
 	/**
 	 * Change directory
 	 *