From cabf37be488cce41ad1d7c0f48ae7a2212eb9f3a Mon Sep 17 00:00:00 2001
From: Andreas Trantidis <atrantidis@gmail.com>
Date: Wed, 2 Apr 2014 17:26:20 +0300
Subject: [PATCH] Prevent multi <style> generation

If the autogenerate_stylesheet option is set to true then the library is adding multiple times the same style on the head of the document (see the source of the http://gridster.net/demos/adding-widgets-dynamically.html demo in order to observe this). With this correction the gridster style element is only inserted once on the style.
---
 src/jquery.gridster.js | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/jquery.gridster.js b/src/jquery.gridster.js
index 95c4b6d0..ed960f3e 100644
--- a/src/jquery.gridster.js
+++ b/src/jquery.gridster.js
@@ -2808,18 +2808,21 @@
     */
     fn.add_style_tag = function(css) {
       var d = document;
-      var tag = d.createElement('style');
+      if(!document.getElementById('gridster-stylesheet')){
+        var tag = d.createElement('style');
+        tag.id = 'gridster-stylesheet';
 
-      d.getElementsByTagName('head')[0].appendChild(tag);
-      tag.setAttribute('type', 'text/css');
+        d.getElementsByTagName('head')[0].appendChild(tag);
+        tag.setAttribute('type', 'text/css');
 
-      if (tag.styleSheet) {
-        tag.styleSheet.cssText = css;
-      }else{
-        tag.appendChild(document.createTextNode(css));
-      }
+        if (tag.styleSheet) {
+          tag.styleSheet.cssText = css;
+        }else{
+          tag.appendChild(document.createTextNode(css));
+        }
 
-      this.$style_tags = this.$style_tags.add(tag);
+        this.$style_tags = this.$style_tags.add(tag);
+      }
 
       return this;
     };