Why isn't the angular2 css style applying to dynamically generated elements?

Question: Why does the note.component.css file not work for dynamically created elements within note.component.ts in Angular 2? Is this the expected behavior?

The note.component.css can style elements that already exist in note.component.html. If I move the CSS styles to the "styles.css" file, it works. If I apply the styles with DOM manipulation, it also works.

Directory Structure:

app
    components
        note
            note.component.css
            note.component.html
            note.component.ts
index.html
styles.css

note.component.html:

<div id="section1"></div>

note.component.css:

button{
    background-color: green; //does not work
}

styles.css:

button{
    background-color: green; //works
}

note.component.ts:

  ngOnInit() {
    var div = document.createElement("button"); 
    div.innerHTML = "Hello world";
    // div.style.backgroundColor = "green"; --- works
    document.getElementById("section1").appendChild(div);
  }

Answer №1

This issue is related to the ViewEncapsulation property of the Component. By default, it is set to Emulated, which creates a separate 'scope' for the Component's view. There are two solutions to resolve this problem:

1) Change the encapsulation setting to ViewEncapsulation.None

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

@Component({
    ...
    encapsulation: ViewEncapsulation.None
})

2) Add the prefix :host /deep/ to your CSS selectors

:host /deep/ button {
    background-color: green;
}

*Please note that as William B mentioned, manipulating the DOM directly in Angular is not recommended. For more information, refer to #2 here

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