Ways to help a child notice when a parent's variable changes

Looking for help with passing data to a child component? Check out this Plunker:

http://plnkr.co/edit/G1EgZ6kQh9rMk3MMtRwA?p=preview

@Component({
  selector: 'my-app',
  template: `
    <input #x />

    <br />
    <child [value]="variable"></child>

    <button (click)='test(x.value)'>Button</button>
  `,
  directives: [ ChildComponent ]
})
export class AppComponent {
  public variable;


  test (x:any){
    console.log('test',x);
    this.variable = x;
  }

}

This is my primary component where I update the variable value.

I'm trying to assign an input's value to a variable, then pass that variable value as an input to a child component so it can receive the updated value. However, it's not working as expected. Can someone help me spot my mistake?

Answer №1

It seems like the intention is to pass the value of the <input> rather than the <input> element itself.

<child [value]="x.value"></child>

Check out this Plunker for an example

Answer №2

I'm pleased to report that your Plunker code is functioning perfectly. I made a simple adjustment to the @input property and was able to view the results effortlessly:

@Input() data;

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