Discovering child elements within an iframe using Angular and customizing their appearance

Is there a simple and effective way to locate child nodes within an iframe using Angular in order to access the HTML element? Currently, I have implemented the following method:

I designated a reference variable within my iframe (#privacyPolicy)

<iframe
    name="privacy-policy" 
    id="privacy-policy"
    [src]="myURL"
    #privacyPolicy>
</iframe>

In my Component, I utilized @ViewChild to obtain access to my iframe

export class MyClass implements AfterViewInit {
  @ViewChild('privacyPolicy', { static: false }) privacyPolicy: ElementRef<any>;

  ngAfterViewInit() {
    const hostElement = this.privacyPolicy.nativeElement;
    console.log(hostElement.children);
    console.log(hostElement.parentNode);
    console.log('iframe', this.privacyPolicy.nativeElement.style.border = '1px solid black');
  }
}

The third console.log() within the ngAfterViewInit() lifecycle function successfully styles the iframe element. However, I am seeking to style the html element nested within the iframe element.

I attempted the following approach without success:

hostElement.children[0].style.border = "1px solid black";

Are there any straightforward and efficient Angular methods to accomplish this task?

Answer №1

To obtain the content HTML from an Iframe, you must first access the contentDocument. In your scenario:

const hostElement = this.privacyPolicy.nativeElement;
hostElement.contentDocument.body.style.border = '1px solid black';

If you wish to apply a new style to your iframe:

 const hostElement = this.privacyPolicy.nativeElement;
 const iframe = hostElement.contentDocument;
 const style = document.createElement('style');
 let newStyle = 'body {background-color: red;}';
 style.innerText = newStyle;
 iframe.head.appendChild(style);

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