angular elementref parent - TypeScript (1)

📌 相关文章

📜 angular elementref parent - TypeScript (1)

📅 最后修改于: 2023-12-03 15:29:23.429000 🧑 作者: Mango

Angular ElementRef Parent - TypeScript

In Angular, the ElementRef class provides access to the underlying HTML element of a component, directive or a DOM element in a template. The ElementRef allows us to perform operations on the HTML element such as getting or setting its attributes, listening to events, modifying its styles, and much more.

Sometimes, we may want to access the parent element of an ElementRef object to perform certain operations or get some information about the parent element. In this article, we’ll see how to access the parent element of an ElementRef object and perform some operations on it in TypeScript.

Accessing the Parent Element

To access the parent element of an ElementRef object, we need to use the nativeElement property of the ElementRef object. This property returns the underlying native HTML element, which we can then use to access its parentElement property.

Here’s an example of accessing the parent element of an ElementRef object:

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

@Component({
  selector: 'app-my-component',
  template: '<div id="my-div" class="container"></div>'
})
export class MyComponent implements OnInit {
  constructor(private elRef: ElementRef) {}

  ngOnInit() {
    const myDiv = this.elRef.nativeElement.parentElement;
    console.log(myDiv); // Output: <body>…</body>
  }
}

In the above example, we have a simple component that has a <div> element. We access this element in the ngOnInit() method of the component using the ElementRef and get its parent element using the parentElement property of the nativeElement.

Here, we’re logging the parent element to the console, which is the <body> element of our HTML page.

Performing Operations on the Parent Element

Once we have access to the parent element using the ElementRef, we can perform any operations that we want on it.

Here’s an example of setting the background color of the parent element using the style property of the parent element:

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

@Component({
  selector: 'app-my-component',
  template: '<div id="my-div" class="container"></div>'
})
export class MyComponent implements OnInit {
  constructor(private elRef: ElementRef) {}

  ngOnInit() {
    const myDiv = this.elRef.nativeElement.parentElement;
    myDiv.style.backgroundColor = 'red';
  }
}

In the above example, we’ve set the background color of the parent element of the <div> to red by accessing the parent element using the ElementRef, and then setting its background color using the style property.

Conclusion

In conclusion, we have seen how to access the parent element of an ElementRef object and perform some operations on it in TypeScript. The nativeElement property of the ElementRef object provides us with the underlying HTML element, which can then be used to access the parent element or perform operations on it.

By understanding how to use the ElementRef and nativeElement properties, we can easily manipulate the DOM elements in our Angular applications, making them more dynamic and engaging for the user.