fixes #2930, IE8 does not accept null for zIndex style property

svn changeset:7807/svn branch:6.0

1 files changed, 10 insertions, 1 deletions

diff --git a/src/com/vaadin/terminal/gwt/client/ui/VAbsoluteLayout.java b/src/com/vaadin/terminal/gwt/client/ui/VAbsoluteLayout.java
index a370909167..0e1f56039a 100644
--- a/src/com/vaadin/terminal/gwt/client/ui/VAbsoluteLayout.java
+++ b/src/com/vaadin/terminal/gwt/client/ui/VAbsoluteLayout.java
@@ -303,7 +303,16 @@ public class VAbsoluteLayout extends ComplexPanel implements Container {
                 }
                 // ensure ne values
                 Style style = getElement().getStyle();
-                style.setProperty("zIndex", zIndex);
+                /*
+                 * IE8 dies when nulling zIndex, even in IE7 mode. All other css
+                 * properties (and even in older IE's) accept null values just
+                 * fine. Assign empty string instead of null.
+                 */
+                if (zIndex != null) {
+                    style.setProperty("zIndex", zIndex);
+                } else {
+                    style.setProperty("zIndex", "");
+                }
                 style.setProperty("top", top);
                 style.setProperty("left", left);
                 style.setProperty("right", right);