Angular2: Declare Input Variable in Directive as required / not-required?

Question

Can I declare a input var in a directive as required or even better as non-required? We have default value set to false here in example, but if I forget to declare in parent component template, then ng2 AoT says its an error:

 @Input() serverWaiting: boolean = false;

dokkis · Accepted Answer · 2016-10-13 13:23:05Z

2

@Input are non-required as default. I don't think there is an option to make them required but you can do something like this:

@Input() serverWaiting: boolean = false; 
@Input() variableRequired: string; 
ngOnInit(){
    if(this.variableRequired==null){
       throw new Error('variableRequired field is required')
    }
}

answered Oct 13, 2016 at 13:23

dokkis

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