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POObserving internal model attributes with Dart Polymer
 

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    <p>I'm setting up custom Polymer elements that need to display data from the model (<code>Property</code> objects that need to be passed around).</p> <p>I can successfully display the values of the properties, but when I update a value inside a <code>Property</code> object, the value is not updated inside the element.</p> <p>What am I missing? I based myself on the following examples:</p> <p><a href="https://github.com/sethladd/dart-polymer-dart-examples/tree/master/web/bind_component_field_to_model_field" rel="nofollow">https://github.com/sethladd/dart-polymer-dart-examples/tree/master/web/bind_component_field_to_model_field</a></p> <p><a href="https://github.com/sethladd/dart-polymer-dart-examples/tree/master/web/getter_setter_as_attribute" rel="nofollow">https://github.com/sethladd/dart-polymer-dart-examples/tree/master/web/getter_setter_as_attribute</a></p> <p><strong>wb-control-text.html</strong></p> <pre><code>&lt;polymer-element name="wb-control-text"&gt; &lt;template&gt; &lt;div&gt; &lt;label for="{{id}}"&gt;{{label}}&lt;/label&gt; &lt;input type="text" id="{{id}}" value="{{value}}" /&gt; &lt;button on-click="{{updateValue}}"&gt;Update me&lt;/button&gt; &lt;/div&gt; &lt;/template&gt; &lt;script type="application/dart" src="wb-control-text.dart"&gt;&lt;/script&gt; &lt;/polymer-element&gt; </code></pre> <p><strong>wb-control-text.dart</strong></p> <pre><code>import "package:polymer/polymer.dart"; import "package:rqn_workbench/wb-property.dart"; @CustomTag("wb-control-text") class WorkbenchControlTextElement extends PolymerElement { final TextProperty _idProperty = new TextProperty("id", value: "1"); final TextProperty _valueProperty = new TextProperty("value", value:"Bla"); final TextProperty _labelProperty = new TextProperty("label", value:"Label!"); WorkbenchControlTextElement.created() : super.created(); @published String get id =&gt; _idProperty.value; void set id(String id) { _idProperty.value = id; } @published String get value =&gt; _valueProperty.value; void set value(String value) { _valueProperty.value = value; } @published String get label =&gt; _labelProperty.value; void set label(String label) { _labelProperty.value = label; } void updateValue() { value += "Bla"; print(value); // Will print the appended value } } </code></pre> <p><strong>wb-property.dart</strong></p> <pre><code>library workbench_property; import "package:polymer/polymer.dart"; @observable class Property { String key; } @observable class TextProperty extends Property { String value; TextProperty ( String key, {String value} ) { this.key = key; this.value = value; } } </code></pre>
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    1. USTom Verelst
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