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ICollectionView Interface
Type parameters
-
T
Heirarchy
Properties
Methods
Events
Properties
canFilter
Gets a value that indicates whether this view supports filtering via the filter property.
canGroup
Gets a value that indicates whether this view supports grouping via the groupDescriptions property.
canSort
Gets a value that indicates whether this view supports sorting via the sortDescriptions property.
currentItem
Gets the current item in the view.
currentPosition
Gets the ordinal position of the current item in the view.
filter
Gets or sets a callback used to determine if an item is suitable for inclusion in the view.
NOTE: If the filter function needs a scope (i.e. a meaningful 'this' value), then remember to set the filter using the 'bind' function to specify the 'this' object. For example:
collectionView.filter = this._filter.bind(this);
groupDescriptions
Gets a collection of GroupDescription objects that describe how the items in the collection are grouped in the view.
groups
Gets the top-level groups.
isEmpty
Gets a value that indicates whether this view contains no items.
items
Gets the filtered, sorted, grouped items in the view.
sortDescriptions
Gets a collection of SortDescription objects that describe how the items in the collection are sorted in the view.
sourceCollection
Gets or sets the collection object from which to create this view.
Methods
beginUpdate
-
Suspends refreshes until the next call to endUpdate.
Returns void
contains
-
Returns a value that indicates whether a given item belongs to this view.
Parameters
-
item: T
The item to locate in the collection.
Returns boolean
-
deferUpdate
-
Executes a function within a beginUpdate/endUpdate block.
The collection will not be refreshed until the function has been executed. This method ensures endUpdate is called even if the function throws.
Parameters
-
fn: Function
Function to be executed within the beginUpdate/endUpdate block.
-
Optional force: boolean
Whether to force a refresh when ending the update.
Returns void
-
endUpdate
-
Resumes refreshes suspended by a call to beginUpdate.
Parameters
-
Optional force: boolean
Whether to force a refresh when ending the update.
Returns void
-
implementsInterface
-
Returns true if the object implements a given interface.
Parameters
-
interfaceName: string
Name of the interface to look for.
Returns boolean
-
moveCurrentTo
-
Sets the specified item to be the current item in the view.
Parameters
-
item: T
The item to set as the currentItem.
Returns boolean
-
moveCurrentToFirst
-
Sets the first item in the view as the current item.
Returns boolean
moveCurrentToLast
-
Sets the last item in the view as the current item.
Returns boolean
moveCurrentToNext
-
Sets the item after the current item in the view as the current item.
Returns boolean
moveCurrentToPosition
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Sets the item at the specified index in the view as the current item.
Parameters
-
index: number
The index of the item to set as the currentItem.
Returns boolean
-
moveCurrentToPrevious
-
Sets the item before the current item in the view as the current item.
Returns boolean
refresh
-
Re-creates the view using the current sort, filter, and group parameters.
Returns void
Events
collectionChanged
Occurs when the collection changes.
currentChanged
Occurs after the current item changes.
currentChanging
Occurs before the current item changes.
Enables collections to have the functionalities of current record management, custom sorting, filtering, and grouping.
This is a JavaScript version of the ICollectionView interface used in Microsoft's XAML platform. It provides a consistent, powerful, and MVVM-friendly way to bind data to UI elements.
Wijmo includes several classes that implement ICollectionView. The most common is CollectionView, which works based on regular JavsScript arrays.