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Questions tagged [ngonchanges]

Respond when Angular (re)sets data-bound input properties. The method receives a SimpleChanges object of current and previous property values. Called before ngOnInit and whenever one or more data-bound input properties change.

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Angular5: ngOnChanges is called pretty slow

I am using Angular 5. I have a simple parent component and a child component. From the parent component I pass the searchTerm to the child component. The child component uses the searchTerm text to search and display the results in a table.…
Nik D.
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How to clear previous values from ngOnchanges based on selection in Angular4

In my app component I have an accordion ,User selected menu's ID will be passed to the child component by using ngOnChanges ,From the child component calling the API based on the app component selected menu's ID . Accordion structure…
Nikson
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IONIC2/Angular2 ngOnChange doesn't work

I'm new to Angular2 and I've been struggling for a while with this problem and have found no solution to it online. [on ionic2!] I want to use ngOnChanges() so i can detect changes to zonaid: estados.html:
mbc
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Implementing ngOnChange to capture old and current value in Angular2

I was trying to implement ngOnChanges() to capture previous and current value. The function I have implemented works fine. I am able to see previous and current value in the console but I am getting this error even though my code is compiling…
Ritesh Puri
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Triggering $onChanges in Angular App

I have a component "MealItemCollection" with an $onChanges function in my Angular app. The component is used by two separate parent components, "Recipe" and "MealPlan". Both parent components pass in an "items" prop the exact same way. However,…
user3143105
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Angular4, Getting error f.ngOnChanges is not a function in target es5

Getting an error f.ngOnChanges is not a function The issue only happens if my tsconfig.json file is setup to target es5, However if my target is es6 everything works as expected. Does anyone know how I can get ngOnChange work if my target is…
Daniel Izhar
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Detect changing value in object with @Input

Question: why are the changed to the object in the parent not displaying in the child component? I am having difficulty detecting changing values in an object in a parent component when it is displayed in the child component. The parent component…
Shane G
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NgOnChanges Not Firing After HTTP Request

I have an issue with ngonchanges not firing. I have this component: @Component({ selector: 'conversation-detail', templateUrl: './conversation-detail.component.html' }) export class ConversationDetailComponent implements OnChanges{ …
HarvP
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$onChanges in non component controller

I'm using angular 1.5 and I have controller, but it not a component, just usual controller. I tried to use $onChanges in this, but it not working. So, is it actually possible to use $onChanges on a non component controller?
Amir Suhail
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Angular2 ngOnChanges clone @Input array

I'm using a DashboardComponent that gets the data from my DashboardService. This Component then passes my array of objects to my form component. (Plunkr link at bottom of post) DashboardComponent.ts private bottleArray: Bottle[] = []; ngOnInit()…
Alex Beugnet
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Programmatic changes to Angular 2 component does not execute ngOnChanges in unit test

I have a rather simple, working Angular 2 component. The component renders some div sibling elements based off of an array of values that I have sorted. This component implements OnChanges. The sorting functionality happens during the execution of…
Joey Vargas
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ionic 2 component ion-tabs has rootParams, detect changes in rootParams

I have an ionic2 application that has ion-tabs as below. Inside my tabpage controller i would get the value like this. …
harikrish
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Angular 2: onChanges() is not reflecting Object value changes

preDefinedSearch is object searchCategory is string, when I change both values, at very first event of OnChangescontains both value like below, Changes: Object {searchCategory: SimpleChange, preDefinedSearch: SimpleChange} but with next update to…
Bhargav Patel
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Why ngOnChanges is not running in this case? (Angular Docs Example)

I'm learning angular and I run into this ngOnChanges example from Angular docs (stackblitz) : on-changes-parent.component.html

{{title}}

Noob
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ngOnChanges do not display changes expected in a variable

i am trying to understand the callback ngOnChanges() so i created the below posted example. but at the compile time despite the interface Post has values for its attributes title and content respectively, however, i do not receive any logs from…
Amrmsmb
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