GUACAMOLE-310: Use input element select() function when available.

guacamole/src/main/webapp/app/clipboard/services/clipboardService.js

@@ -135,6 +135,13 @@ angular.module('clipboard').factory('clipboardService', ['$injector',
      */
     var selectAll = function selectAll(element) {
 
+        // Use the select() function defined for input elements, if available
+        if (element.select)
+            element.select();
+
+        // Fallback to manual manipulation of the selection
+        else {
+
             // Generate a range which selects all nodes within the given element
             var range = document.createRange();
             range.selectNodeContents(element);
@@ -144,6 +151,8 @@ angular.module('clipboard').factory('clipboardService', ['$injector',
             selection.removeAllRanges();
             selection.addRange(range);
 
+        }
+
     };
 
     /**
@@ -175,6 +184,7 @@ angular.module('clipboard').factory('clipboardService', ['$injector',
         }
 
         // Select all data within the clipboard target
+        clipboardContent.focus();
         selectAll(clipboardContent);
 
         // Attempt to copy data from clipboard element into local clipboard