Flex bindable variable not updating

15-Sep-2017 00:34

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When you change the default constant, the Flex compiler will NOT generate code and you are responsible for dispatching the event yourself. If you don't change the default constant, every [Bindable] property will dispatch the public static const EVENT_CHANGED_CONST: String = "event Changed Const"; private var _number: Number = 0; [Bindable(event=EVENT_CHANGED_CONST)] public function get number(): Number public function set number(value: Number) : void The code above assigns a static property to the event name, and then uses the same assignment to dispatch the event.

However, when the value changes, the binding does not appear to work.

If any of these errors occur, the binding manager catches them silently and will not perform the binding.

For instance, take a look at the UIComponent class signature (see Figure 3). This will enable all public properties of the class for data binding.

You will find that although you do not need to bind the String since it is a one-time assignment, the compiler still generates code to accommodate binding of the property.

Additionally, there are cases where you want to unbind after the assignment or remove the binding code to reduce overhead, but you will not be able to do so using the tag in MXML or curly braces to easily implement binding; however, there is overhead associated with these methods.

If your data binding expression references the selected Item property of the List, it will be null until the user actually clicks an item in the List and selects it.

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marker interface must dispatch events for properties in the class, and any nested classes are publicly exposed as properties.

The binding mechanism will swallow any errors to prevent runtime exceptions from being thrown at runtime.

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