How to display an image from a URL in an ItemRenderer component

Using a DisplayObjectRecycler, an ItemRenderer component may be customized with an AssetLoader to display an image loaded from a URL.

Create the ListView

To start, create a ListView component and pass it a data collection containing some items.

var listView = new ListView();
listView.dataProvider = new ArrayCollection([
    { name: "Pizza", iconURL: "" },
    { name: "Cheeseburger", iconURL: "" },
    { name: "French Fries", iconURL: "" }
listView.itemToText = item ->;

The techniques used in this tutorial apply to an ItemRenderer used in any data container — not just ListView. The code shouldn't require more than trivial tweaks for other containers, such as GridView or GroupListView.

Similarly, you should be able to use the same capabilities with HierarchicalItemRenderer in containers like TreeView or TreeGridView.

The itemToText function makes it easy to populate the item renderer's text, but how to display the URLs stored by the iconURL property?

Create the ItemRenderer and AssetLoader

By using a DisplayObjectRecycler, we can customize the default ItemRenderer component to display both text and images.

Call DisplayObjectRecycler.withFunction() to create an item renderer and pass an AssetLoader to the item renderer's icon property.

var recycler = DisplayObjectRecycler.withFunction(() -> {
    var itemRenderer = new ItemRenderer();

    itemRenderer.icon = new AssetLoader();

    return itemRenderer;
listView.itemRendererRecycler = recycler;

We don't populate the source property of the AssetLoader yet because the creation function doesn't have access to any items from the list view's data provider. That data becomes available later, in the recycler's update function.

Set the source of the AssetLoader

In the recycler's update function, we have access to a ListViewItemState object that contains all of the data that we need to populate the item renderer, including the item from the data provider that is storing the image's URL.

recycler.update = (itemRenderer:ItemRenderer, state:ListViewItemState) -> {
    itemRenderer.text = state.text;

    var loader = cast(itemRenderer.icon, AssetLoader);
    loader.source =;

To access the AssetLoader that we created in DisplayObjectRecycler.withFunction(), cast the icon property. Then, use the data property of the ListViewItemState to get the item from the data provider, which has our iconURL property.

Be sure to set the item renderer's text property too. When you provide a recycler with a custom update function, the text is no longer populated automatically.