Binding is not working in Angular2 template

Question

errorType is not showing when calling with Alert.showAlert("success","someMsg");from another Component but it's working when initializing at the declaration of errorType itself.

component :

 import {Component} from 'angular2/core';

    @Component({
        selector: 'alert-component',
        templateUrl: 'app/alert.template.html'
    })

    export class Alert {

     public static errorType:string;
     public static messageAlrt:string;

     public static showAlert(type:string, message:string): void{
          Alert.errorType=type;
        }

    }

template :

<div id="messageAlert" >
            <strong>{{errorType}}:</strong> this is the error message at top of the page      
        </div>

Really apreciate your help in resolving this problem that errrorType value is not getting bound to erroType

can u share the code from where you are calling showAlert function — Ch K V S Kumar
– Ch K V S Kumar, Commented Jun 2, 2016 at 16:55

Community · Accepted Answer · 2017-05-23 10:30:52Z

It's because you use static fields. When using {{errorType}}, a non static property of the component is used.

I would refactor your component this way:

import {Component} from 'angular2/core';

@Component({
    selector: 'alert-component',
    templateUrl: 'app/alert.template.html'
})
export class Alert {
  public errorType:string;
  public messageAlrt:string;
}

When you want to display your alert, I would add it dynamically:

@Component({
  (...)
  template: `<div #target></div>`
})
export class SomeComponent {
  @ViewChild('target', {read: ViewContainerRef}) target;

  showAlert(type:string, message:string) {        
    this.resolver.resolveComponent(Alert).then(
      (factory:ComponentFactory<any>) => {
        this.cmpRef = this.target.createComponent(factory);
        this.cmpRef.type = type;
      }
    );
  }

See this great Günter's answer:

Angular 2 dynamic tabs with user-click chosen components

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