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Side by Side Diff: pkg/template_binding/lib/src/element.dart

Issue 355133002: switch Node.bind to interop (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 6 years, 5 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4
5 part of template_binding;
6
7 /** Extensions to the [Element] API. */
8 class _ElementExtension extends NodeBindExtension {
9 _ElementExtension(Element node) : super._(node);
10
11 bind(String name, value, {bool oneTime: false}) {
12 Element node = _node;
13
14 if (node is OptionElement && name == 'value') {
15 // Note: because <option> can be a semantic template, <option> will be
16 // a TemplateBindExtension sometimes. So we need to handle it here.
17 node.attributes.remove(name);
18
19 if (oneTime) return _updateOption(value);
20 _open(value, _updateOption);
21 } else {
22 bool conditional = name.endsWith('?');
23 if (conditional) {
24 node.attributes.remove(name);
25 name = name.substring(0, name.length - 1);
26 }
27
28 if (oneTime) return _updateAttribute(_node, name, conditional, value);
29
30 _open(value, (x) => _updateAttribute(_node, name, conditional, x));
31 }
32 return _maybeUpdateBindings(name, value);
33 }
34
35 void _updateOption(newValue) {
36 OptionElement node = _node;
37 var oldValue = null;
38 var selectBinding = null;
39 var select = node.parentNode;
40 if (select is SelectElement) {
41 var bindings = nodeBind(select).bindings;
42 if (bindings != null) {
43 var valueBinding = bindings['value'];
44 if (valueBinding is _InputBinding) {
45 selectBinding = valueBinding;
46 oldValue = select.value;
47 }
48 }
49 }
50
51 node.value = _sanitizeValue(newValue);
52
53 if (selectBinding != null && select.value != oldValue) {
54 selectBinding.value = select.value;
55 }
56 }
57 }
58
59 void _updateAttribute(Element node, String name, bool conditional, value) {
60 if (conditional) {
61 if (_toBoolean(value)) {
62 node.attributes[name] = '';
63 } else {
64 node.attributes.remove(name);
65 }
66 } else {
67 // TODO(jmesserly): escape value if needed to protect against XSS.
68 // See https://github.com/polymer-project/mdv/issues/58
69 node.attributes[name] = _sanitizeValue(value);
70 }
71 }
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