Typescript compiler error property does not exist on object

Question

I'm receiving typescript errors 'property does not exist on object' from my typescript files. I've read a few posts regarding this but I'm still unsure how to implement the work around.

I have a JSON object has two properties, I unpack it so I can access both of the values directly, which works fine, it's just a compile time I receive the error.

payload: {
   value1: '',
   value2: ''
}

my private method is where the issues are coming through.

private update(respo : Object) : void {

    if (respo.hasOwnProperty('value1') || respo.hasOwnProperty('value2')) {
        (<FormControl>this.controlGroup.controls['ctrlone']).setValue(respo.value1);

        (<FormControl>this.controlGroup.controls['ctrltwo']).setValue(respo.value2);
    }
}

I tried to export an interface like the one below but I get a console error '? parameter not found'

 interface responseObject {
    value1?: string
    value2?: string
 }

Any help is appreciated. I'm using typescript 1.8.

Jimi.

drewwyatt · Accepted Answer · 2016-10-24 01:31:25Z

3

Your issue appears to be with the type argument. Don't type that as Object. Though I'm not sure what the issue is with your interface (it might be that you are missing semicolons?)

This works for me:

interface responseObject {
    value1?: string;
    value2?: string;
}

class SomeClass {
    private update(respo : responseObject) : void {
        if (respo.hasOwnProperty('value1') || respo.hasOwnProperty('value2')) {
            (<FormControl>this.controlGroup.controls['ctrlone']).setValue(respo.value1);

            (<FormControl>this.controlGroup.controls['ctrltwo']).setValue(respo.value2);
        }
    }
}

When you type something as Object the only attributes that the compiler knows about are those that exist on Object. Making an interface is definitely the correct way to go about this (so good on you for that!) but in the future, the "workaround" you are probably looking for is type any.

edited Oct 24, 2016 at 1:31

answered Oct 24, 2016 at 1:24

drewwyatt

5,99915 gold badges68 silver badges109 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Typescript compiler error property does not exist on object

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related