Styling does not affect an Angular component that is injected into an iframe

I am facing an issue with styling in an iframe when trying to append my own angular component. Despite various attempts, I have been unsuccessful in getting the styling to apply to the component within the iframe.

Upon loading the iframe, I use JavaScript to add the component as follows:

let component= document.getElementById('componentId');
let divInIframe= iframeWindow.document.getElementById('divInIframeId');
divInIframe.appendChild(component);

Even after trying to manually add the component's styling to the iframe's CSS file and applying styles through JavaScript post iframe load, the component still lacks the desired styling.

let cssLink = document.createElement("link");
cssLink.href = "../../assets/component.css";
cssLink.rel = "stylesheet";
cssLink.type = "text/css";
iframDoc.head.appendChild(cssLink);

Despite experimenting with ViewEncapsulation.None and other solutions, nothing seems to make it work. The only solution that has worked is using encapsulation:ViewEncapsulation.ShadowDom, but unfortunately this is not compatible with IE11.

If anyone has a suggestion on how to resolve this issue, I would greatly appreciate it.

javascripthtmlcssangulariframe

Answer №1

To include the assets folder, make sure to add it in the angular.json file under "projects" for your specific app name:

"projects":{
   "YourAppNameHere":{
      ...
      "assets":[
        "src/assets"
      ]
      ...
    }
 }

After adding the assets folder, you can then use cssLink.href = "assets/component.css";

Answer №2

When you add HTML to your component in Angular, the styles and classes may not be recognized by Angular due to default behavior. To address this, you can change the encapsulation to ViewEncapsulation.none (although highly unrecommended) or sanitize the external code using a sanitizer. I suggest referring to the DomSanitizer documentation for more information.

Answer №3

Here are some steps you can take:

selector: 'app-name',
templateUrl: './component_name.component.html',
styleUrls: ['./component_name.component.css']

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