webstaff: add routine for Dojo JS to detect if running in iframe

Sometimes legacy Dojo interfaces may need to adjust their
behavior if they're embedded in the web staff client. This patch
adds a new utility function, openils.Util.inIFrame(), to detect
if such code is running in an iframe. If so, the presumption
is that iframe belongs to the web staff client.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>

diff --git a/Open-ILS/web/js/dojo/openils/Util.js b/Open-ILS/web/js/dojo/openils/Util.js
index 804d13c..e3588ae 100644 (file)
--- a/Open-ILS/web/js/dojo/openils/Util.js
+++ b/Open-ILS/web/js/dojo/openils/Util.js
@@ -494,5 +494,19 @@ if(!dojo._hasResource["openils.Util"]) {
         );
     };
 
+    /**
+     * Check to see if we're running in an iframe; if we
+     * are, we assume that the iframe is specifically one
+     * used by the web staff client to embed legacy interfaces.
+     */
+    openils.Util.inIframe = function() {
+        /* http://stackoverflow.com/a/326076 */
+        try {
+            return window.self !== window.top;
+        } catch (e) {
+            return true;
+        }
+    };
+
 }