Factor out the anchor prefix to easily allow switching to #!

client/web/link.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library web.link;
 
 import 'dart:html';
 import 'package:dartdoc_viewer/item.dart';
 import 'package:dartdoc_viewer/search.dart' show searchIndex;
 import 'package:polymer/polymer.dart';
+import 'package:dartdoc_viewer/location.dart';
 
 // TODO(jmesserly): just extend HtmlElement?
 @CustomTag("dartdoc-link")
 class LinkElement extends PolymerElement {
   @published LinkableType type;
 
   LinkElement.created() : super.created();
 
   enteredView() {
     super.enteredView();
     searchIndex.onLoad(typeChanged);
   }
 
   void typeChanged() {
     this.children.clear();
     if (type == null) return;
 
     Element child;
     final location = type.loc.withoutAnchor;
     if (searchIndex.map.containsKey(location)) {
-      child = new AnchorElement()..href = '#${type.loc.withAnchor}';
+      child = new AnchorElement()..href = locationPrefixed(type.loc.withAnchor);
     } else {
       child = new Element.tag('i');
     }
     this.append(child..text = type.simpleType);
   }
 }