Issue encountered when attempting to assign a value to an array property in Angular

Having trouble setting an array property in angular 6 using the following code:

this.addupdate.roleids=this.selectedRole;

An error is being thrown:

ERROR TypeError: Cannot set property 'roleids' of undefined at AccessLevelComponent.push../src/app/admin/admin/dashboard/role/access-level/access-level.component.ts.AccessLevelComponent.AddRoleClaim (access-level.component.ts:60)

selectedRole:string[]=['1011','1010','1005'];

Here's my interface definition:

export interface IAddorupdateRole {
  roleids:string[];
  roleid:number;
}

And here's part of my code:

public AddRoleClaim(){
  console.log("enter AddRoleClaim.Ts");
  this.addupdate.roleids=this.selectedRole;
  this.addupdate.roleid=this.roleId;
  this.roleService.AddOrUpdateRoleCalim(this.addupdate).subscribe((data)=>
    {
      console.log("success" + data);
    }
  );
}

What could be causing this issue? How can I resolve it?

javascriptangulartypescriptangular6

Answer №1

When trying to access roleids on this.addupdate, it seems that this.addupdate is undefined, suggesting that it may not have been initialized yet.

To resolve this issue, you can initialize this.addupdate as a basic object in the ngOnInit method like so:

addupdate: IAddorupdateRole;

ngOnInit() {
  this.addupdate = {
    roleids: [],
    roleid: 0
  }
}

For reference, check out this Sample StackBlitz.

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