Angular: How can I override a property Input of type Function

When working with Angular, you may come across a situation where you need to override a property Input of type Function. This can be achieved using a technique called property binding. In this blog post, we will explore two solutions to override a property Input of type Function in Angular.

Solution 1: Using a setter

One way to override a property Input of type Function is by using a setter. By defining a setter for the property, you can intercept the value being assigned and perform any necessary modifications.

Here’s an example:

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

@Component({
  selector: 'app-example',
  template: `
    
{{ title }}
  `
})
export class ExampleComponent {
  private _title: string;

  @Input()
  set title(value: string) {
    // Perform any necessary modifications
    this._title = value.toUpperCase();
  }

  get title(): string {
    return this._title;
  }
}

In the above code snippet, we define a setter for the title property. Inside the setter, we can modify the value as per our requirements. In this case, we are converting the title to uppercase. The getter is used to retrieve the modified value.

Solution 2: Using a custom directive

Another way to override a property Input of type Function is by using a custom directive. By creating a directive, you can intercept the property binding and customize the behavior.

Here’s an example:

import { Directive, ElementRef, Input, OnInit } from '@angular/core';

@Directive({
  selector: '[appTitle]'
})
export class TitleDirective implements OnInit {
  @Input('appTitle') title: string;

  constructor(private elementRef: ElementRef) {}

  ngOnInit() {
    // Perform any necessary modifications
    this.elementRef.nativeElement.innerText = this.title.toUpperCase();
  }
}

In the above code snippet, we create a custom directive called TitleDirective. Inside the ngOnInit method, we can modify the value of the title property as per our requirements. In this case, we are converting the title to uppercase and updating the inner text of the element.

To use this directive, you can simply apply it to the desired element in your component’s template:

Both solutions provide a way to override a property Input of type Function in Angular. Choose the solution that best fits your use case and enjoy the flexibility of Angular!

I hope this blog post helps you in overriding a property Input of type Function in Angular. If you have any further questions, feel free to leave a comment below.

Happy coding!