Angular 2 + how to select and loop over multiple elements with the same selector (elementRef.nativeElement)

别说谁变了你拦得住时间么 提交于 2019-12-06 04:08:02

To achieve expected result, use below option

Option 1:

As you are using .each method, using index and value you can avoid querySelectorAll, reference - http://api.jquery.com/jquery.each/

$("input.option_input").each(function(index,element){
        if(element.checked){
            element.checked=false;
            element.dispatchEvent(new Event('change'));
            element = "";
        }
    });

code sample - https://codepen.io/nagasai/pen/aGoMKz?editors=1010

Option 2

Option2 and preferred way is to avoid document.querySelectorAll ,as it fetches all matching elements of the DOM irrespective of the current component

Steps to achieved expected result,

  1. Use Renderer and ElementRef to fetch current component elements
  2. Use this.elem.nativeElement.querySelectorAll for fetching matching elements

component.ts

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  name = 'Angular 5';
  constructor(private renderer: Renderer, private elem: ElementRef){}

  unsetAllOptions(){
    let elements = this.elem.nativeElement.querySelectorAll('.option_input');
    elements.forEach(element => {
     if(element.checked){
        element.checked = false
     }
});
 }
}

component.html

<hello name="{{ name }}"></hello>
<p>
  Start editing to see some magic happen :)
</p>

<input type="checkbox" class="option_input" checked>
<input type="checkbox" class="option_input" checked>
<input type="checkbox" class="option_input" checked>
<input type="checkbox" class="option_input" checked>
<input type="checkbox" class="option_input">

<button (click)="unsetAllOptions()">UncheckAll</button>

code sample - https://stackblitz.com/edit/angular-aei58i?file=app/app.component.html

this worked for me but if you know a better way. Let me know

unsetAllOptions(){
    var self = this;
    var i = -1;
    $("input.option_input").each(function(){
        i++;
        var element = self.elRef.nativeElement.querySelectorAll("input.option_input")[i];
        element.checked=false;
    });
}
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