Is it achievable to have a Dynamic Angular Output?

Question

Is it achievable to have a Dynamic Angular Output?

With multiple parent components needing a common child component that can dynamically and automatically adapt to each case, I am faced with the challenge of generating buttons using a forEach loop with data provided by the parent component (such as name, CSS class, and output name).

My main question is: Is it possible to dynamically create Outputs that directly link to the corresponding parent function?

One potential solution I have considered is to have a single output that sends a string or always integrates with the same parent function, which would then interpret and redirect it to the appropriate function using a switch statement. However, this approach doesn't seem very elegant or efficient to me.

So far, I have attempted to implement this in the child component, but I encountered an error in the editor:

child-component.components.ts

@Input() myButtons: any[];
constructor() {
    this.myButtons.forEach(array => {
      @Output() array.variableName: EventEmitter<number>;
    });
}

Of course, I am sending an array with all the necessary data from the parent:

parent-component.components.html

<app-child-component [myButtons]="buttonsArray"></app-child-component>

angular typescript

Answer 1

Answer №1

After seeking assistance from the community at "Stack Overflow en Español", also known as Stack Overflow in Spanish, I was able to find the solution I was looking for.

1- I discovered that Dynamic Output cannot be utilized due to the fact that the annotations/decorations 'Input' and 'Output' are applied during compile time and not at runtime.

These annotations do not exist in JavaScript and are used to enhance functionality during compile time, making it impossible to dynamically modify the code during runtime.

2- An alternative approach is to use event handlers:

In this method, the parent component can include a function within the data provided to the child component, which will be triggered in response to an event on the element being created.

For instance, an array of data objects is created with properties such as eventHandler and text.

The child component then receives this array and generates a series of buttons. When a button is clicked, the function specified in the eventHandler property is executed.

Parent Component

import { Component } from "@angular/core";

@Component({
  selector: "my-app",
  templateUrl: "./app.component.html",
  styleUrls: ["./app.component.css"]
})
export class AppComponent {

  data = [
    {
      eventHandler: () => {
        alert("button 1");
      },
      text: "button 1"
    },
    {
      eventHandler: () => {
        alert("button 2");
      },
      text: "button 2"
    }
  ];
  
}

Child Component

import { Component, Input } from "@angular/core";

@Component({
  selector: "hello",
  template: `
    <div *ngFor="let d of data">
      <button (click)="d.eventHandler()">{{ d.text }}</button>
    </div>
  `,
  styles: [
    `
      h1 {
        font-family: Lato;
      }
    `
  ]
})
export class HelloComponent {
  @Input() data: any[];
}

View Live Demo

Link to the original question in Spanish

Answer 2

After seeking assistance from the community at "Stack Overflow en Español", also known as Stack Overflow in Spanish, I was able to find the solution I was looking for.

1- I discovered that Dynamic Output cannot be utilized due to the fact that the annotations/decorations 'Input' and 'Output' are applied during compile time and not at runtime.

These annotations do not exist in JavaScript and are used to enhance functionality during compile time, making it impossible to dynamically modify the code during runtime.

2- An alternative approach is to use event handlers:

In this method, the parent component can include a function within the data provided to the child component, which will be triggered in response to an event on the element being created.

For instance, an array of data objects is created with properties such as eventHandler and text.

The child component then receives this array and generates a series of buttons. When a button is clicked, the function specified in the eventHandler property is executed.

Parent Component

import { Component } from "@angular/core";

@Component({
  selector: "my-app",
  templateUrl: "./app.component.html",
  styleUrls: ["./app.component.css"]
})
export class AppComponent {

  data = [
    {
      eventHandler: () => {
        alert("button 1");
      },
      text: "button 1"
    },
    {
      eventHandler: () => {
        alert("button 2");
      },
      text: "button 2"
    }
  ];
  
}

Child Component

import { Component, Input } from "@angular/core";

@Component({
  selector: "hello",
  template: `
    <div *ngFor="let d of data">
      <button (click)="d.eventHandler()">{{ d.text }}</button>
    </div>
  `,
  styles: [
    `
      h1 {
        font-family: Lato;
      }
    `
  ]
})
export class HelloComponent {
  @Input() data: any[];
}

View Live Demo

Link to the original question in Spanish

Is it achievable to have a Dynamic Angular Output?

Answer №1

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