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angular / 12 / api / core / simplechange.html

SimpleChange

class final

Represents a basic change from a previous to a new value for a single property on a directive instance. Passed as a value in a SimpleChanges object to the ngOnChanges hook.

class SimpleChange {
  constructor(previousValue: any, currentValue: any, firstChange: boolean)
  previousValue: any
  currentValue: any
  firstChange: boolean
  isFirstChange(): boolean
}

See also

Constructor

constructor(previousValue: any, currentValue: any, firstChange: boolean)

Parameters
previousValue any
currentValue any
firstChange boolean

Properties

Property Description
previousValue: any Declared in Constructor
currentValue: any Declared in Constructor
firstChange: boolean Declared in Constructor

Methods

isFirstChange()

Check whether the new value is the first value assigned.

isFirstChange(): boolean

Parameters

There are no parameters.

Returns

boolean

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Licensed under the Creative Commons Attribution License 4.0.
https://v12.angular.io/api/core/SimpleChange