I'm trying to figure out the best way to successfully pass a prop to another component in TypeScript without running into the frustrating issue of not being able to

I have been facing an issue while trying to pass a prop from a custom object I have defined. The structure of the object is as follows:

export type CustomObjectType = {
    data?: DataObject
  };

  export type DataObject = {
    id: number;
    name: string;
    description: string;
    status: Boolean;
    date_created: Date | string;
    date_updated: Date | string;
    priority: number;
    category: string;
    comments?: string;
    department: string;
    tags: string[];
    attachments: string[];
    report_files: string[];
    project_status: string;
    user_id: number;
    contact_person: string;
    authorized_persons: string[];
  }

Below is the section in my component where I am attempting to pass it:

import { DataObject, CustomObjectType } from '../customObjects/CustomObjectType';
import { styles } from '../design';

type DataProps = {
  data: DataObject;
};

const DisplayData: React.FC<DataProps> = ({ data }) => {
  console.log("Hello", data);

  return (
    <div justify-content-between>
      <p>Name: {data.name}</p>
      {/* Include additional components that utilize `data` */}
    </div>
  );
};

export default DisplayData;

The issue arises as I consistently receive an error stating "cannot read properties of undefined" whenever I try to access a field within the custom object.

Answer №1

Before accessing the properties of stepOne, it is important to check if it is not undefined. Use the optional chaining operator: ?.

Here is an example:

<p>Project Title: {stepOne?.short_title}</p>

This will help avoid the error of "stepOne is undefined."

Additionally, you can consider using conditional rendering as well.

<Grid sx={classes.input}>
    <p>Project Title: {stepOne?.short_title}</p>

    { !!stepOne &&
         /* Add other components that rely on `stepOne` */
    }
</Grid>

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