Angular2 How to get reference of HTML elements generated dynamically

问题

I have this inputs generated dynamically:

  <div *ngFor="let cell of column; let i = index;">
          <!-- Material design input-->
          <md-input id="my-input-{{i}}">
          </md-input>
  </div>

Please notice id=my-input-{{i}} I would like to get a reference to the DOM element based on this dynamic id. This input can be 3, 6 or more inputs so I need to access the id dynamically and get a hold to it.

回答1:

The only response is

let elem:Element = document.getElementById("myProgrammaticallyChosenIndex")

No other angular weird ceremony needed

Tested on angular 4+

回答2:

Use ElementRef class from @angular/core to get the parent element and then create an HTMLElement to get its dynamic elements by class name.

Component:

declare var $: any; //intentional use of jQuery-not recommended though

@Component({
  selector: 'my-app',
  template: `
    <input type='button' (click)='addDiv()' value='Add New Div' />

    <input type='button' (click)='selectDiv()' value='Select' />
  `
})
export class App {
  constructor(private elRef: ElementRef) {
  }

  addDiv() {
    /*intentional use of jQuery for appending new div
     give a class to your dynamic elements*/

    $('my-app').append("<div class='foo'>Hello I'm Dynamic!</div>");
  }

  selectDiv() {
    //create a new HTMLElement from nativeElement
    var hElement: HTMLElement = this.elRef.nativeElement;

    //now you can simply get your elements with their class name
    var allDivs = hElement.getElementsByClassName('foo');

    //do something with selected elements
    console.log(allDivs);
  }
}

Working Plunker

Edit: I used jQuery only for quick demo purpose here. Otherwise, you should not use jQuery with Angular.

回答3:

There is a class called ElementRef class

It gives your permit direct access to the current component or directive hosting DOM.

You can use ElementRef.nativeElement to get a HTML element, then you can access to html element properties to make your modification by using jQuery or Renderer class provided by Angular 2.

Example with ElementRef and Renderer:

import { Directive, ElementRef, Input, Renderer } from '@angular/core';
@Directive({ selector: '[myHighlight]' })
export class HighlightDirective {
    constructor(el: ElementRef, renderer: Renderer) {
       renderer.setElementStyle(el.nativeElement, 'backgroundColor', 'yellow');
    }
}

回答4:

You can access the DOM by the elementRef.

Inject it through your constructor by

constructor(myElement: ElementRef) { ... }

And access the DOM element by the nativeElement property

myElement.nativeElement.select("#blabla")

来源：https://stackoverflow.com/questions/40535014/angular2-how-to-get-reference-of-html-elements-generated-dynamically

标签

angular

angular2-template

angular2-directives