html - Angular2 - Is it possible to use variable string for HostListener? -


i don't think possible prefer ask (just in case): possible :

@directive({   selector: '[apptag]' }) export class tagdirective {   @input() apptag: tagevent;    private _tagtriggerevent = 'click';   @input() set tagtriggerevent(triggerevent: string) {     this._tagtriggerevent = triggerevent || this._tagtriggerevent;   }    constructor(private el: elementref, private renderer: renderer) {   }    @hostlistener(this._tagtriggerevent) ontriggerevent() {     if (this.apptag) {       this.sendtag(this.apptag);     }   }    sendtag(tagparam: tagevent) {     ...   }  }

and call :

<div [apptag]="mytagparam">watch click on div</div> <div [apptag]="mytagparam" [tagtriggerevent]="mouseenter">watch mouseenter on div</div>

that's not supported. these decorators evaluated @ build time.

you can use

constructor(private renderer:renderer, private elementref:elementref) {}  private tagtriggereventregistration:function; @input() set tagtriggerevent(event:string) {   if(this.tagtriggereventregistration) {     this.tagtriggereventregistration(); // cancel previous listener   }   this.tagtriggereventregistration = this.renderer.listen(this.elementref.nativeelement, event, (event) => { ontriggerevent(e);}); }

see dynamically add event listener in angular 2


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