From a46a49b747f89cdc926fd7d2fd41237d6d060ee7 Mon Sep 17 00:00:00 2001
From: Piotr Przybylski <piotrprz@gmail.com>
Date: Thu, 10 Mar 2011 18:48:16 +0100
Subject: [PATCH] make PMA_changeClassForColumn work about 1/4th faster

---
 js/sql.js | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/js/sql.js b/js/sql.js
index aa49d8ea1..a7b8e621d 100644
--- a/js/sql.js
+++ b/js/sql.js
@@ -998,10 +998,14 @@ function PMA_changeClassForColumn($this_th, newclass) {
     var th_index = $this_th.index();
     // .eq() is zero-based
     th_index--;
-    var $tr_with_data = $this_th.closest('table').find('tbody tr ').has('td.data');
-    $tr_with_data.each(function() {
-        $(this).find('td.data:eq('+th_index+')').toggleClass(newclass);
-    });
+    var $tds = $this_th.closest('table').find('tbody tr').find('td.data:eq('+th_index+')');
+    if ($this_th.data('has_class_'+newclass)) {
+        $tds.removeClass(newclass);
+        $this_th.data('has_class_'+newclass, false);
+    } else {
+        $tds.addClass(newclass);
+        $this_th.data('has_class_'+newclass, true);
+    }
 }
 
 $(document).ready(function() {