User Guide

388 Components Dictionary

In the following example, a Delete Item button is disabled if the items have been removed

from the collection and the target DataSet object has no more items:

my_ds.addEventListener("modelChanged", onModelChanged);

function onModelChanged(evt_obj:Object):Void {

trace("model changed, DataSet now has " + evt_obj.target.items.length + "

items");

}

// Disable events for the data set.

my_ds.disableEvents();

my_ds.addItem({name:"Apples", price:14});

my_ds.addItem({name:"Bananas", price:8});

trace("Before:");

traceItems();

my_ds.last();

while (my_ds.hasPrevious()) {

my_ds.price *= 0.5; // Everything's 50% off!

my_ds.previous();

}

trace("After:");

traceItems();

// Tell the dataset it's time to update the controls now.

my_ds.enableEvents();

function traceItems(label:String):Void {

for (var i:Number = 0; i < my_ds.items.length; i++) {

trace("\t" + my_ds.items[i].name + " - $" + my_ds.items[i].price);

}

trace("");

}