Css Values Not Applying On Dynamically Injected Html Div Elements In Angular 4

If you're working with Angular 4 and finding that CSS values are not being applied to dynamically injected HTML div elements, don't worry, you're not alone in facing this common issue. In this guide, we'll walk through the reasons behind this problem and provide you with practical solutions to ensure that your CSS styles work seamlessly with dynamically added elements in your Angular 4 application.

The issue typically arises when you inject new HTML div elements dynamically into your Angular 4 application but find that the CSS styles that should be applied to these elements are not being rendered as expected. This happens because the styles defined in your CSS files are not automatically applied to dynamically created elements.

One of the main reasons behind this behavior is that the CSS styles are applied when the page loads initially. However, when new elements are added dynamically, the styles may not get applied because the browser does not automatically reapply the CSS rules to these new elements.

To overcome this issue and ensure that your CSS values are correctly applied to dynamically injected HTML div elements in Angular 4, you can use Angular's Renderer2 class. Renderer2 provides methods to manipulate elements in a way that encapsulates the actual native element implementation and ensures that the changes are made in a way that respects the environment.

Here's a step-by-step guide on how to solve this problem:

1. Import the Renderer2 class in your component file:

import { Component, Renderer2 } from '@angular/core';

2. Inject the Renderer2 class in your component's constructor:

constructor(private renderer: Renderer2) {}

3. Use the Renderer2 class to apply CSS styles to dynamically added elements:

ngAfterViewInit() {
  const dynamicElement = this.renderer.createElement('div');
  this.renderer.addClass(dynamicElement, 'your-css-class');
  this.renderer.setStyle(dynamicElement, 'color', 'red');
  // Append the dynamic element to the DOM
  this.renderer.appendChild(this.elementRef.nativeElement, dynamicElement);
}

By following these steps, you can ensure that your CSS styles are correctly applied to dynamically injected HTML div elements in your Angular 4 application. The Renderer2 class helps you overcome the limitation of CSS not being automatically applied to new elements and ensures that your styles are consistently rendered across all elements, whether static or dynamic.

In conclusion, understanding how to work with dynamically injected elements and applying CSS styles correctly in Angular 4 is essential for building robust and visually appealing web applications. By leveraging Angular's Renderer2 class, you can easily tackle this common issue and ensure that your styles are applied uniformly throughout your application.