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Using arrays in Flex data binding

When working with arrays, such as Array or ArrayCollection objects, you can use arrays as the source or destination of Flex data-binding expressions.

Note: when using an array as the binding source, you should use an array of type ArrayCollection, because the ArrayCollection class can issue events to trigger Flex data binding when the array or array elements change. For example, calls to the ArrayCollection.addItem (), ArrayCollection.addItemAt (), ArrayCollection.removeItem (), and ArrayCollection.removeItemAt () methods trigger Flex data binding.

Bind to an array

Typically, an array is bound to the dataProvider property of a Flex control. The following example illustrates the use of array binding for a List control:

This example defines an ArrayCollection object, and then sets the dataProvider property of the List control to the Flex data binding to the ArrayCollection. Flex data binding is triggered when you modify an element in an ArrayCollection object, or when you modify a reference to an ArrayCollection object.

Bind to elements in an array

You can use a single element in an array as the source of Flex data binding, as shown in the following example:

If you specify the array element as the source of the Flex data binding expression through the square bracket syntax [], Flex data binding is triggered only when the application starts, or when the array or its reference is updated. Flex data binding is not triggered when this array element is updated.

However, the myAC.getItemAt (0) in the Flex data binding expression is updated when the array element changes. Therefore, Text controls with id of text2 are updated when button1 is clicked, while Text controls with id of text1 are not updated.

When using elements in an array as the source of the Flex data binding representation, you should use the ArrayCollection.getItemAt () method in the binding expression.

Copying myAC2 to myAC when you click button2 triggers all Flex data bindings to array elements regardless of how they are implemented.

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