ASP.NET Core MVC Controls | ComponentOne
In This Topic
    ObservableArray Class
    In This Topic
    File
    wijmo.js
    Module
    wijmo.collections
    Base Class
    ArrayBase
    Derived Classes
    AxisCollection, PlotAreaCollection, DefinedNameCollection, PivotFieldCollection, LayoutItemCollection
    Implements
    INotifyCollectionChanged

    Array that sends notifications on changes.

    The class raises the collectionChanged event when changes are made with the push, pop, splice, shift, unshift, insert, or remove methods.

    Warning: Changes made by assigning values directly to array members or to the length of the array do not raise the collectionChanged event.

    Constructor

    Properties

    Methods

    Events

    Constructor

    constructor

    constructor(data?: T[]): ObservableArray
    

    Initializes a new instance of the ObservableArray class.

    Parameters
    • data: T[]
    Optional

    Array containing items used to populate the ObservableArray.

    Returns
    ObservableArray

    Properties

    isUpdating

    Gets a value that indicates whether notifications are currently suspended (see beginUpdate and endUpdate).

    Type

    Methods

    beginUpdate

    beginUpdate(): void
    

    Suspends notifications until the next call to endUpdate.

    Returns
    void

    clear

    clear(): void
    

    Removes all items from the array.

    Returns
    void

    deferUpdate

    deferUpdate(fn: Function): void
    

    Executes a function within a beginUpdate/endUpdate block.

    The collection will not be refreshed until the function finishes. This method ensures endUpdate is called even if the function throws an exception.

    Parameters
    • fn: Function

      Function to be executed without updates.

    Returns
    void

    endUpdate

    endUpdate(): void
    

    Resumes notifications suspended by a call to beginUpdate.

    Returns
    void

    implementsInterface

    implementsInterface(interfaceName: string): boolean
    

    Returns true if the caller queries for a supported interface.

    Parameters
    • interfaceName: string

      Name of the interface to look for.

    Returns
    boolean

    indexOf

    indexOf(searchElement: T, fromIndex?: number): number
    

    Searches for an item in the array.

    Parameters
    • searchElement: T

      Element to locate in the array.

    • fromIndex: number
    Optional

    The index where the search should start.

    Returns
    number

    insert

    insert(index: number, item: T): void
    

    Inserts an item at a specific position in the array.

    Parameters
    • index: number

      Position where the item will be added.

    • item: T

      Item to add to the array.

    Returns
    void

    onCollectionChanged

    onCollectionChanged(e?: NotifyCollectionChangedEventArgs): void
    

    Raises the collectionChanged event.

    Parameters
    Optional

    Contains a description of the change.

    Returns
    void

    push

    push(...items: T[]): number
    

    Adds one or more items to the end of the array.

    Parameters
    • ...items: T[]

      One or more items to add to the array.

    Returns
    number

    remove

    remove(item: T): boolean
    

    Removes an item from the array.

    Parameters
    • item: T

      Item to remove.

    Returns
    boolean

    removeAt

    removeAt(index: number): void
    

    Removes an item at a specific position in the array.

    Parameters
    • index: number

      Position of the item to remove.

    Returns
    void

    setAt

    setAt(index: number, item: T): void
    

    Assigns an item at a specific position in the array.

    Parameters
    • index: number

      Position where the item will be assigned.

    • item: T

      Item to assign to the array.

    Returns
    void

    shift

    shift(): T
    

    Removes the first element from the array and returns that element.

    This method changes the length of the array.

    Returns
    T

    slice

    slice(begin?: number, end?: number): T[]
    

    Creates a shallow copy of a portion of an array.

    Parameters
    • begin: number Optional

      Position where the copy starts.

    • end: number Optional

      Position where the copy ends.

    Returns
    T[]

    sort

    sort(compareFn?: Function): this
    

    Sorts the elements of the array in place.

    Parameters
    • compareFn: Function Optional

      Specifies a function that defines the sort order. If specified, the function should take two arguments and should return -1, +1, or 0 to indicate the first argument is smaller, greater than, or equal to the second argument. If omitted, the array is sorted in dictionary order according to the string conversion of each element.

    Returns
    this

    splice

    splice(index: number, count: number, ...item: T[]): T[]
    

    Removes and/or adds items to the array.

    Parameters
    • index: number

      Position where items will be added or removed.

    • count: number

      Number of items to remove from the array.

    • ...item: T[]

      One or more items to add to the array.

    Returns
    T[]

    unshift

    unshift(...items: T[]): number
    

    Adds one or more elements to the beginning of the array and returns the new length of the array.

    Parameters
    • ...items: T[]

      One or more items to add to the array.

    Returns
    number

    Events

    collectionChanged

    Occurs when the collection changes.

    Arguments
    NotifyCollectionChangedEventArgs