1 files changed, 65 insertions, 0 deletions
diff --git a/resources/src/mediawiki.action/mediawiki.action.view.redirect.js b/resources/src/mediawiki.action/mediawiki.action.view.redirect.js
new file mode 100644
index 00000000..52e0d4e3
--- /dev/null
+++ b/resources/src/mediawiki.action/mediawiki.action.view.redirect.js
@@ -0,0 +1,65 @@
+/*!
+ * JavaScript to update page URL when a redirect is viewed, ensuring that the
+ * page is scrolled to the id when it's a redirect with fragment.
+ *
+ * This is loaded in the top queue, so avoid unnecessary dependencies
+ * like mediawiki.Title or mediawiki.Uri.
+ */
+( function ( mw, $ ) {
+	var profile = $.client.profile(),
+		canonical = mw.config.get( 'wgInternalRedirectTargetUrl' ),
+		fragment = null,
+		shouldChangeFragment, index;
+
+	// Clear internal mw.config entries, so that no one tries to depend on them
+	mw.config.set( 'wgInternalRedirectTargetUrl', null );
+
+	index = canonical.indexOf( '#' );
+	if ( index !== -1 ) {
+		fragment = canonical.slice( index );
+	}
+
+	// Never override the fragment if the user intended to look at a different section
+	shouldChangeFragment = fragment && !location.hash;
+
+	// Replace the whole URL if possible, otherwise just change the fragment
+	if ( canonical && history.replaceState ) {
+		if ( !shouldChangeFragment ) {
+			// If the current page view has a fragment already, don't override it
+			canonical = canonical.replace( /#.*$/, '' );
+			canonical += location.hash;
+		}
+
+		// This will also cause the browser to scroll to given fragment
+		history.replaceState( /*data=*/ history.state, /*title=*/ document.title, /*url=*/ canonical );
+
+		// …except for IE 10 and 11. Prod it with a location.hash change.
+		if ( shouldChangeFragment && profile.name === 'msie' && profile.versionNumber >= 10 ) {
+			location.hash = fragment;
+		}
+
+	} else if ( shouldChangeFragment ) {
+		if ( profile.layout === 'webkit' && profile.layoutVersion < 420 ) {
+			// Released Safari w/ WebKit 418.9.1 messes up horribly
+			// Nightlies of 420+ are ok
+			return;
+		}
+
+		location.hash = fragment;
+	}
+
+	if ( shouldChangeFragment && profile.layout === 'gecko' ) {
+		// Mozilla needs to wait until after load, otherwise the window doesn't
+		// scroll.  See <https://bugzilla.mozilla.org/show_bug.cgi?id=516293>.
+		// There's no obvious way to detect this programmatically, so we use
+		// version-testing.  If Firefox fixes the bug, they'll jump twice, but
+		// better twice than not at all, so make the fix hit future versions as
+		// well.
+		$( function () {
+			if ( location.hash === fragment ) {
+				location.hash = fragment;
+			}
+		} );
+	}
+
+}( mediaWiki, jQuery ) );