A short tutorial on how to render html inside html in Angular

chhkas1 — Fri, 02 Feb 2024 07:17:17 +0000

In this tutorial, you will learn

how to render html inside html in angular
The use of sanitizer in rendering html in angular.

In Angular, you can render HTML within an HTML tag using the innerHTML property. You can bind the HTML content to a variable and then use this variable within the HTML tag. Here's an example:

In your component.ts file:

import { Component } from '@angular/core';

@Component({
  selector: 'app-example',
  template: `
    <div [innerHTML]="htmlContent"></div>
  `
})
export class ExampleComponent {
  htmlContent = '<p>This is the rendered HTML content</p>';
}

By using the innerHTML property binding, you can render HTML content within the specified HTML tag in Angular. Always be cautious with this approach especially if the HTML comes from an untrusted source to avoid cross-site scripting (XSS) vulnerabilities.

In Angular, you can use the DomSanitizer service to sanitize and securely render HTML content. This is crucial for preventing cross-site scripting (XSS) vulnerabilities when rendering user-provided or untrusted HTML. Here's how you can use the DomSanitizer

First, you need to import DomSanitizer from '@angular/platform-browser' in your component file.

import { Component } from '@angular/core';
import { DomSanitizer, SafeHtml } from '@angular/platform-browser';

@Component({
  selector: 'app-example',
  template: `
    <div [innerHtml]="sanitizedHtml"></div>
  `
})
export class ExampleComponent {
  sanitizedHtml: SafeHtml;

  constructor(private sanitizer: DomSanitizer) {
    const untrustedHtml = '<script>alert("This is a malicious script!")</script>';
    this.sanitizedHtml = this.sanitizer.bypassSecurityTrustHtml(untrustedHtml);
  }
}

In this example, we import DomSanitizer and SafeHtml. We then inject DomSanitizer into the component's constructor. We use bypassSecurityTrustHtml() method of DomSanitizer to securely render the untrusted HTML by bypassing Angular's built-in security. Finally, we bind the sanitized HTML to the innerHtml property of a HTML tag within the component's template.

By using DomSanitizer, you can mitigate the risk of XSS attacks when rendering untrusted HTML in your Angular application. Always be careful when dealing with untrusted HTML and consider other security measures as well.

It is highly recommended to sanitize your HTML while rendering to keep it protected.
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A short tutorial on how to render html inside html in Angular