From b1b07c532518443ea693dee2f966c73a21936230 Mon Sep 17 00:00:00 2001
From: Sean Harvey <sean@silverstripe.com>
Date: Wed, 6 May 2009 05:53:22 +0000
Subject: [PATCH] BUGFIX Fixed scenarios where the page is readonly and the
 expected ParentType elements don't exist causing a JS error

git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/cms/trunk@76258 467b73ca-7a2a-4603-9d3b-597d59a354a9
---
 javascript/CMSMain_right.js | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/javascript/CMSMain_right.js b/javascript/CMSMain_right.js
index de246c55..453cc6de 100755
--- a/javascript/CMSMain_right.js
+++ b/javascript/CMSMain_right.js
@@ -97,8 +97,14 @@ Behaviour.register({
 	// ParentType / ParentID field combination
 	'#Form_EditForm_ParentType' : {
 		initialize : function() {
-			$('Form_EditForm_ParentType_root').onclick = this.rootClick.bind(this);
-			$('Form_EditForm_ParentType_subpage').onclick = this.showHide;
+			var parentTypeRootEl = $('Form_EditForm_ParentType_root');
+			var parentTypeSubpageEl = $('Form_EditForm_ParentType_subpage');
+			if(parentTypeRootEl) {
+				parentTypeRootEl.onclick = this.rootClick.bind(this);
+			}
+			if(parentTypeSubpageEl) {
+				parentTypeSubpageEl.onclick = this.showHide;
+			}
 			this.showHide();
 		},
 		
@@ -108,7 +114,8 @@ Behaviour.register({
 		},
 		
 		showHide : function() {
-			if($('Form_EditForm_ParentType_root').checked) {
+			var parentTypeRootEl = $('Form_EditForm_ParentType_root');
+			if(parentTypeRootEl && parentTypeRootEl.checked) {
 				Element.hide('ParentID');
 			} else {
 				Element.show('ParentID');