Trigger the child component's function from the parent component by clicking a button in Angular2

Question

Trigger the child component's function from the parent component by clicking a button in Angular2

One of the functions in my child component is as follows:

reload() {
    clearInterval(this.points);
    this.initiateInterval();
    this.redrawImages();
}

This function redraws a few images on the window.resize event.

Now, in the parent component, I have a button called menu-burger which minimizes the window. I want to link this button to the reload() function in the child component.

Here is the button code from the parent component:

<button class="collapseMenuIcon" (click)="toggleMenu()">

I tried searching for similar queries on Stack Overflow, but couldn't find one that fits my scenario - mainly because the reload function is heavily dependent on elements in the child component.

Furthermore, several solutions from previous questions are outdated due to frequent changes in Angular2.

Thank you in advance, I appreciate any help and will upvote all answers.

javascript angular events typescript components

Answer 1

Answer №1

Opting for a shared service can be a beneficial choice. Another alternative to consider is utilizing a Subject between the parent and child components without the need for a service, depending on your specific requirements.

To implement this approach, declare the Subject in the child component:

import { Subject } from 'rxjs/Subject';

public static dataUpdate: Subject<boolean> = new Subject();

Then, subscribe to the Subject in the child component's constructor:

constructor(....) {
    MyChildComponent.dataUpdate.subscribe(res => {
        this.updateData();
    });
}

In the parent component:

import { MyChildComponent } from './my-path';

Trigger the child component to execute the updateData method upon button click:

toggleButton() {
  MyChildComponent.dataUpdate.next(true);
}

Answer 2

Opting for a shared service can be a beneficial choice. Another alternative to consider is utilizing a Subject between the parent and child components without the need for a service, depending on your specific requirements.

To implement this approach, declare the Subject in the child component:

import { Subject } from 'rxjs/Subject';

public static dataUpdate: Subject<boolean> = new Subject();

Then, subscribe to the Subject in the child component's constructor:

constructor(....) {
    MyChildComponent.dataUpdate.subscribe(res => {
        this.updateData();
    });
}

In the parent component:

import { MyChildComponent } from './my-path';

Trigger the child component to execute the updateData method upon button click:

toggleButton() {
  MyChildComponent.dataUpdate.next(true);
}

Answer 3

Answer №2

When it comes to communicating between components, there are various methods available. Personally, I opt for using a service as it has proven to be effective for me.

To learn more about this topic, check out: https://angular.io/docs/ts/latest/cookbook/component-communication.html

The service example mentioned above is the one that I prefer and find straightforward to implement.

Edit:

Utilizing services enables you to have independent components that can be used in different parts of the application. This method also allows for seamless data sending/receiving and facilitates two-way communication. I highly recommend incorporating this approach.

Answer 4

When it comes to communicating between components, there are various methods available. Personally, I opt for using a service as it has proven to be effective for me.

To learn more about this topic, check out: https://angular.io/docs/ts/latest/cookbook/component-communication.html

The service example mentioned above is the one that I prefer and find straightforward to implement.

Edit:

Utilizing services enables you to have independent components that can be used in different parts of the application. This method also allows for seamless data sending/receiving and facilitates two-way communication. I highly recommend incorporating this approach.

Trigger the child component's function from the parent component by clicking a button in Angular2

Answer №1

Answer №2

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