How to observe an element inside selector using Microsofts API In Angular

How to observe an element inside selector using Microsoft’s API in Angular

When working with TypeScript in Angular, you may come across a situation where you need to observe changes to an element inside a selector. Microsoft’s API provides a convenient way to achieve this. In this blog post, we will explore how to observe an element inside a selector using Microsoft’s API in Angular, and we will provide multiple solutions to cater to different scenarios.

Solution 1: Using MutationObserver

MutationObserver is a built-in Web API that allows you to react to changes in the DOM. It can be used to observe changes to an element inside a selector. Here’s how you can implement it in Angular:

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

@Component({
  selector: 'app-my-component',
  template: `
    Element to observe
  `
})
export class MyComponent implements OnInit {
  constructor(private elementRef: ElementRef) {}

  ngOnInit() {
    const elementToObserve = this.elementRef.nativeElement.querySelector('#myElement');

    const observer = new MutationObserver((mutationsList, observer) => {
      // Handle mutations here
      console.log(mutationsList);
    });

    observer.observe(elementToObserve, { attributes: true, childList: true, subtree: true });
  }
}

In this solution, we use the ElementRef to access the native element of the component. We then use querySelector to select the element we want to observe. Finally, we create a new MutationObserver instance and call the observe method to start observing the element. You can handle the mutations inside the provided callback function.

Solution 2: Using ViewChild

If you have a reference to the element you want to observe, you can use the ViewChild decorator to access it directly. Here’s an example:

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

@Component({
  selector: 'app-my-component',
  template: `
    Element to observe
  `
})
export class MyComponent implements AfterViewInit {
  @ViewChild('myElement') myElementRef: ElementRef;

  ngAfterViewInit() {
    const elementToObserve = this.myElementRef.nativeElement;

    const observer = new MutationObserver((mutationsList, observer) => {
      // Handle mutations here
      console.log(mutationsList);
    });

    observer.observe(elementToObserve, { attributes: true, childList: true, subtree: true });
  }
}

In this solution, we use the ViewChild decorator to get a reference to the element with the template variable #myElement. We then access the native element using the nativeElement property of the ElementRef. Finally, we create a new MutationObserver instance and call the observe method to start observing the element.

These are two solutions to observe an element inside a selector using Microsoft’s API in Angular. Choose the one that suits your needs best. Happy coding!

Note: Make sure to import the necessary modules and dependencies for the above code snippets to work properly.

How to observe an element inside selector using Microsofts API In Angular