The component does not contain the specified property

One Angular 4 component that I have is like this:

export class MenuComponent {

constructor(private menuService: MenuService) { }


@Input(nodes):any;

   getMenu(path:string): void {
   this.menuService.getData(path).subscribe(data => {
         // Read the result field from the JSON response.

         let newValue = JSON.stringify(data).replace('{"Node":', '[');
         newValue = newValue.substring(0,newValue.length - 1);
         newValue+="]";
        const menu=JSON.parse(newValue);
         this.nodes = menu;
      });

 }
}

An issue keeps popping up saying:

Property 'nodes' does not exist on type 'MenuComponent'
and I can't figure out why because the nodes property is clearly defined in the component.

Answer №1

There are two ways to provide input:

 @Input() hero: Hero;
 @Input('master') masterName: string;

In the code example, a public property name (bindingPropertyName) is being provided without a corresponding property in the component class:

 @Input(nodes):any;

Learn more about @Input here.

Answer №2

My usual practice for defining @input variables is as follows:

  @Input() nodes: any;

I have identified two issues:

  1. From the view of your component, it seems that you are either receiving 'undefined' or not receiving any value at all. Therefore, ensure that the parent component is sending the correct value like this: [nodes]="'this is a value"'

  2. In the Angular component life cycle, confirm that the value of nodes is being received on time.

You may also consider adding the ngInit life cycle hook to set a default value in case nothing is received.

  ngOnInit() {
    this.nodes = this.nodes || '';
  }

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