How do I pass parent component into child component in Angular 7 via @Input()

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Using Angular 7,

I have a component that has an input property that is an object it interogates for some information.

<app-details [item]="whatGoeHere" key="firstName"></app-details>

In the component I then have a input property like so...

export class DetailsComponent implements OnInit{

    @Input() item: any;
    @Input() key: string;

    ngInit(){
      if(this.item && this.item.isYummy){
       ....
      }
    }
    ...
}

When the object I want to pass in is some property of the parent component then I just supply a property name on the parent component and all is good.

But, what if I want to pass in the parent component instance itself rather than one of it's properties? How can the be done?

In some cases it will not be the parent component instance but one of its properties so I want to be able to specify in the binding rather than always referring to the parent.

In KnockoutJs I can use $data, $root to refer to the binding context. Is there a similar concept in Angular?

Inside the host's html

<app-details [item]="whatGoeHere" key="firstName" [context]="this"></app-details>

And define the input property inside the component

export class DetailsComponent implements OnInit{

    @Input() item: any;
    @Input() key: string;
    @Input() context;

    ngInit(){
      if(this.item && this.item.isYummy){
       ....
      }
    }
    ...
}

How do I pass parent component into child component in Angular 7 , Inside the host's html <app-details [item]="whatGoeHere" key="firstName" [ context]="this"></app-details>. And define the input property inside� How to Pass data to a child component. In Angular, the Parent Component can communicate with the child component by setting its Property. To do that the Child component must expose its properties to the parent component. The Child Component does this by using the @Input decorator. In the Child Component. Import the @Input module from @angular

Why do you want to pass the whole parent component? what are you planning to do with the parent inside of the child?

My first reaction is: you shouldn't be wanting to pass the whole parent to a child as you will end up with 2 tightly coupled components.

You can check Angular's docs about how to make your component interact, where you'll see the following alternatives and more.

To make the parent listen for child events

Pass a function from the parent to the child. The child can invoke that function to talk to the parent:

<app-details (myCallback)="parentFunction()" key="firstName"></app-details>;

Angular's documentation for doing this is here

To make bi-directional communication between parent and child

Use a service if what you want is bi-directional communication. You can change data in the service from the child, and have the parent subscribe to changes. The parent could also send changes to the service with some other method, and you can have the child subscribe for those changes too.

Angular's documentation for doing this is here

How to pass data from parent to child component in Angular 9, The @Input() decorator allows Angular to share data with a child component or directive from a parent component which is a very convenient� Angular 7/8/9 Viewchild & Child Components. We can easily access a child component. We will be able to access instance variables and call methods with ease. In the following example, howAreYou() is a method of a child component. Now are going to call the howAreYou() method inside the AppComponent class. app.component.ts

Pass the context of the parent component to the child component as an Input.

I have created stackblitz answer. Check this out...

pass parent component to child

Passing Data to a Nested Component with @Input, Nov 7, 2019; 5 Min read; 5,336 Views. Nov 7 ngOnInit() is one of the lifecycle hooks in Angular, called after the constructor() and ngOnChanges() method. @ Input() is used to interact between components. between components, but @ Input() is used to make the interaction between parent-child types of component. In this case, we send the data from the parent component to the child component using an attribute. This attribute can then be accessed within the child component using the @input decorator. Whereas in the case of a child to parent communication we capture the change in data due to any event or async operations within the child component.

Angular Pass data to child component, learn how to Pass data to child component in Angular using @Input. Detect changes to the input To do that the Child component must expose its properties to the parent component. The Child 7. 8. 9. 10. 11. 12. 13. import { Component, Input } from '@angular/core'; Implement the ngOnChanges() method. The method� The parent component cannot data bind to the child's start and stop methods nor to its seconds property. You can place a local variable, #timer, on the tag <countdown-timer> representing the child component. That gives you a reference to the child component and the ability to access any of its properties or methods from within the parent template.

Passing data into Angular components with @Input, The first step to passing data into an Angular component is to create a custom property to bind to. This is done via “input” binding to pass data from one component to another (typically parent to child). This custom input binding is created via the @Input() decorator! I am a child component! The parent component was able to call the child component’s whoAmI method. Conclusion. You have learned to use ViewChild to access a directive, child component, and a DOM element from a parent component class. If the reference changes to a new element dynamically, ViewChild will automatically update its reference.

How to communicate from parent component to the child component , In the parent component, declare the property that you want to receive in the child parent component, bind the 'ParentId' property to the child component using Now in the child component import Input from @angular/core and create a @ input decorator used to fetch the. // property from the parent component. @Input(). The first step to passing data into an Angular component is to create a custom property to bind to. This is done via “input” binding to pass data from one component to another (typically parent to child). This custom input binding is created via the @Input() decorator! Let’s explore. Follow along with the series:

Comments
  • ngAfterViewChecked life cycle hook
  • this! Pretty obvious now and exactly what I need. I'd assumed there was some weird angular syntax.
  • Glad I could help. :)
  • Big red flag for passing the parent to the child is noted. The reason is the parent component in this case happens to implement an interface that the child component will call some members of. In other cases it won't be the parent component.
  • Could you pass the individual members as outputs to the child component?