AsyncListView  - AS3 Flex

A callback function used to create a substitute item when a request which had caused an ItemPendingError to be thrown, subsequently fails. The existing item, typically a pending item created by the callback function specified by the createPendingItemFunction() property, is replaced with the failed item.

The value of this property must be a function with two parameters: the index of the requested item, and the failure "info" object, which is passed along from the IResponder fault() method. In most cases you can ignore the second parameter. Shown below is an example implementation of the callback function:

     function createFailedItem(index:int, info:Object):Object
     {
         return "[" + index + "request failed]";        
     }
       

Setting this property does not affect failed items that were already created. Setting this property to null prevents failed items from being created.

Wartością domyślną jest A function that unconditionally returns null..

Powiązane elementy interfejsu API

A callback function used to create a provisional item when the initial request causes an ItemPendingError to be thrown. If the request eventually succeeds, the provisional item is automatically replaced by the actual item. If the request fails, then the item is replaced with one created with the callback function specified by the createFailedItemFunction property.

The value of this property must be a function with two parameters: the index of the requested data provider item, and the ItemPendingError itself. In most cases, the second parameter can be ignored. The following example shows an implementation of the callback function:

     function createPendingItem(index:int, ipe:ItemPendingError):Object
     {
         return "[" + index + "request is pending...]";        
     }
       

Setting this property does not affect provisional pending items that were already created. Setting this property to null prevents provisional pending items from being created.

Wartością domyślną jest A function that unconditionally returns null..

Powiązane elementy interfejsu API

The number of items in this collection. 0 means no items while -1 means the length is unknown.

Ta właściwość może być używana jako źródło dla tworzenia powiązań danych. Jeśli ta właściwość zostanie zmodyfikowana, zostanie wywołane zdarzenie collectionChange .

The IList object that this collection wraps. That means the object to which all of the IList methods are delegated.

If this property is null, the IList mutation methods, such as setItemAt(), are no-ops. The IList query methods, such getItemAt(), return null or zero (-1 for getItemIndex()), as appropriate.

Wartością domyślną jest null.

Ta właściwość może być używana jako źródło dla tworzenia powiązań danych. Jeśli ta właściwość zostanie zmodyfikowana, zostanie wywołane zdarzenie listChanged .

Constructor.

Adds the specified item to the end of the list. Equivalent to addItemAt(item, length).

Parametry

Adds the item at the specified index. The index of any item greater than the index of the added item is increased by one. If the the specified index is less than zero or greater than the length of the list, a RangeError is thrown.

Parametry

Returns the value of list.getItemAt(index).

This method catches ItemPendingErrors (IPEs) generated as a consequence of calling getItemAt(). If an IPE is thrown, an IResponder is added to the IPE and a provisional "pending" item, created with the createPendingItemFunction is returned. If the underlying request eventually succeeds, the pending item is replaced with the real item. If it fails, the pending item is replaced with a value produced by calling createFailedItemFunction.

Parametry

Powiązane elementy interfejsu API

Returns the index of the item if it is in the list such that getItemAt(index) == item.

Note: unlike IViewCursor.findxxx() methods, The getItemIndex() method cannot take a parameter with only a subset of the fields in the item being serched for; this method always searches for an item that exactly matches the input parameter.

Parametry

Notifies the view that an item has been updated. This is useful if the contents of the view do not implement IEventDispatcher and dispatches a PropertyChangeEvent. If a property is specified the view may be able to optimize its notification mechanism. Otherwise it may choose to simply refresh the whole view.

Parametry

Removes all items from the list.

If any item is not local and an asynchronous operation must be performed, an ItemPendingError will be thrown.

See the ItemPendingError documentation as well as the collections documentation for more information on using the ItemPendingError.

Removes the actual or pending item at the specified index and returns it. All items whose index is greater than the specified index have their index reduced by 1.

If there is no actual or pending item at the specified index, for example because a call to getItemAt(index) hasn't caused the data to be paged in, then the underlying list may throw an ItemPendingError. The implementation ignores the ItemPendingError and returns null.

Parametry

Places the item at the specified index. If an item was already at that index the new item will replace it and it will be returned.

Parametry

Returns an array with the same elements as this AsyncListView. The array is initialized by retrieving each item with getItemAt(), so pending items are substituted where actual values aren't available yet. The array will not be updated when the AsyncListView replaces the pending items with actual (or failed) values.

Returns a string that contains the list's length and the number of pending item requests. It does not trigger pending requests.

Dispatched when the list's length has changed or when a list element is replaced.

The properties of the event object have the following values. Not all properties are meaningful for all kinds of events. See the detailed property descriptions for more information.