Dynamically mount angular 2 directive [duplicate]

问题

Context

I have a simple directive that add some attributes to a given HTML element based on received attributes.

<button class="btn btn-blue x-large" [myDirective]="{ some_json_data: true }">
    Unfold
</button>

The myDirective directive just does some logic in the ngOnInit hook and decorates the ElementRef native element (in this case the button) adding attributes, nothing complicated.

ngOnInit(): void {
  const el: Element = this.element.nativeElement;
  this.decorate(el, this.myDirective);
}

Problem

Based on a given logic (in myDirective decoration) I want to add a tooltip (which is another directive) to the element referenced by ElementRef at myDirective.

How do I mount a directive manually and how do I add it to an element (ViewContainerRef)?

回答1:

Adding or removing directives dynamically is not supported. Only components can be added and removed dynamically (only dynamically added components can be removed dynamically).

回答2:

You do not add or remove directives dynamically, but if you want to add a tooltip you have to insert a div in your component template that activates it depending on a variable status

<div [hidden]="tooltipnotshown"
     class="tooltip">
 blah blah or whatever ...
</div>

来源：https://stackoverflow.com/questions/45084292/dynamically-mount-angular-2-directive

标签

angular

typescript

angular2-directives