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1 <!DOCTYPE html> | 1 <!DOCTYPE html> |
2 <!-- | 2 <!-- |
3 Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 3 Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
4 for details. All rights reserved. Use of this source code is governed by a | 4 for details. All rights reserved. Use of this source code is governed by a |
5 BSD-style license that can be found in the LICENSE file. | 5 BSD-style license that can be found in the LICENSE file. |
6 --> | 6 --> |
7 <html> | 7 <html> |
8 <head> | 8 <head> |
9 <meta charset="utf-8"> | 9 <meta charset="utf-8"> |
10 </head> | 10 </head> |
11 <body> | 11 <body> |
12 <element name="router-options" extends="ul" apply-author-styles> | 12 <polymer-element name="router-options" extends="ul"> |
13 <template><content></content></template> | 13 <template><content></content></template> |
14 <script type="application/dart"> | 14 <script type="application/dart" src="router_options.dart"></script> |
15 import 'dart:html'; | 15 </polymer-element> |
16 import 'package:web_ui/web_ui.dart'; | |
17 import 'package:web_ui/observe/html.dart'; | |
18 | |
19 /** | |
20 * Given a set of child links to this page, this will add the "selected" CSS | |
21 * class to the link that matches window.location.hash. | |
22 * | |
23 * For example, if the current window.location.hash is "#/completed" and we | |
24 * have a tag like `<a href="#/completed">` it will get the class | |
25 * `class="selected"`, and other links will have that CSS class removed. | |
26 */ | |
27 class RouterOptions extends WebComponent { | |
28 | |
29 var _stopWatcher; | |
30 | |
31 void inserted() { | |
32 super.inserted(); | |
33 | |
34 var anchors = this.queryAll('a'); | |
35 | |
36 _stopWatcher = watchAndInvoke(() => locationHash, (e) { | |
37 var hash = e.newValue; | |
38 if (hash == '') hash = '#/'; | |
39 for (var a in anchors) { | |
40 updateCssClass(a, a.hash == hash, 'selected'); | |
41 } | |
42 }); | |
43 } | |
44 | |
45 void removed() { | |
46 _stopWatcher(); | |
47 super.removed(); | |
48 } | |
49 } | |
50 </script> | |
51 </element> | |
52 </body> | 16 </body> |
53 </html> | 17 </html> |
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