1 files changed, 49 insertions, 3 deletions
diff --git a/resources/mediawiki.action/mediawiki.action.history.js b/resources/mediawiki.action/mediawiki.action.history.js
index 66f90b07..1b5b3a00 100644
--- a/resources/mediawiki.action/mediawiki.action.history.js
+++ b/resources/mediawiki.action/mediawiki.action.history.js
@@ -1,7 +1,53 @@
 /*
  * JavaScript for History action
  */
+jQuery( function( $ ) {
+	var $lis = $( 'ul#pagehistory li' );
+	var updateDiffRadios = function() {
+		var diffLi = false, // the li where the diff radio is checked
+			oldLi = false; // the li where the oldid radio is checked
 
-// Replaces histrowinit
-$( '#pagehistory li input[name=diff], #pagehistory li input[name=oldid]' ).click( diffcheck );
-diffcheck();
-\ No newline at end of file
+		if ( !$lis.length ) {
+			return true;
+		}
+		$lis.removeClass( 'selected' );
+		$lis.each( function() {
+			var $this = $(this);
+			var $inputs = $this.find( 'input[type="radio"]' );
+			if ( $inputs.length !== 2 ) {
+				return true;
+			}
+
+			// this row has a checked radio button
+			if ( $inputs.get(0).checked ) { 
+				oldLi = true;
+				$this.addClass( 'selected' );
+				$inputs.eq(0).css( 'visibility', 'visible' );
+				$inputs.eq(1).css( 'visibility', 'hidden' );
+			} else if ( $inputs.get(1).checked ) {
+				diffLi = true;
+				$this.addClass( 'selected' );
+				$inputs.eq(0).css( 'visibility', 'hidden' );
+				$inputs.eq(1).css( 'visibility', 'visible' );
+			} else { 
+				// no radio is checked in this row
+				if ( diffLi && oldLi ) {
+					// We're below the selected radios
+					$inputs.eq(0).css( 'visibility', 'visible' );
+					$inputs.eq(1).css( 'visibility', 'hidden' );
+	 			} else if ( diffLi ) {
+					// We're between the selected radios
+					$inputs.css( 'visibility', 'visible' );
+				} else {
+					// We're above the selected radios
+					$inputs.eq(1).css( 'visibility', 'visible' );
+					$inputs.eq(0).css( 'visibility', 'hidden' );
+				}
+			}
+		});
+		return true;
+	};
+
+	$( '#pagehistory li input[name="diff"], #pagehistory li input[name="oldid"]' ).click( updateDiffRadios );
+	updateDiffRadios();
+});
+\ No newline at end of file