ng-container的内部HTML，Angular 4？

Question

I want to dynamically place an html code in my html code, So I write the following code:

<ng-container [innerHTML]="buttonIcon"></ng-container>

Angular says innerHTML is not valid attribute for ng-container
I don't want to use third html tag like follows:

<div [innerHTML]="buttonIcon"></div>

So how can I insert html codes without any tag inner html binding?

Answer 1

You can use ngTemplate:

<ng-template #buttonIcon>
    <div> Your html</div>
</ng-template>
<ng-container 
   *ngTemplateOutlet="buttonIcon">
</ng-container>

Answer 2

** Please read the comments. This answer might be wrong. I dont know, have not looked into it again **

ng-container does not get rendered to html, it is a mere structural directive .

The Angular is a grouping element that doesn't interfere with styles or layout because Angular doesn't put it in the DOM .

So there is no element to put html into. You need to work with a sub-div. If there is no need for a sub-div in your opinion, then you could most probably also just replace ng-container with div itself and not use the container at all.

Answer 3

If for any reason you need to replace the DOM element you can use a div with an id and then use the @ViewChild decorator and ElementRef to get access to the nativeElement from the controller and set the outerHtml property.

app.component.tml

<div #iconButton></div>

app.component.ts

import { Component, ViewChild, ElementRef, ViewEncapsulation, AfterViewInit }from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ],
  encapsulation: ViewEncapsulation.None
})
export class AppComponent  implements AfterViewInit{
   @ViewChild('iconButton')
    iconButton: ElementRef;

    ngAfterViewInit(){
      this.iconButton.nativeElement.outerHTML = '<button>My button</button>'
    }
}

We need to use none as encapsulation policy because our template only includes the div to be replaced.

Stackblitz example: https://stackblitz.com/edit/angular-fa1zwp

Answer 4

[outerHTML]

will do the trick to replace the outer element.

In your case

<div [outerHTML]="buttonIcon"></div>

It's true, that it's important to have a clean HTML structure for eg keeping CSS rules as simple as possible.