Handling onChange events for several typescript <Select> elements

Question

Handling onChange events for several typescript <Select> elements

As a non-TS developer, I'm delving into the realm of multiple selects and dropdown menus with Material-UI's select component. Progressing from a basic setup, I successfully implemented a single select but now face a challenge in adding another dropdown using the onChange event.

type OnChangeValue = {
  locationNaming: unknown;
  departmentNaming?: unknown;
};

...

export const ServerNamingDropdown: React.FC<ServerNamingDropdownProps> = ({
  onChange,
  error,
  initialValue = undefined,
}) => {

  const [locationNamingSelected, setLocationNaming] = useState(
    initialValue ? initialValue : '',
  );

...

I need to incorporate a new dropdown for Department which means tweaking the OnChangeValue interface to include 'departmentNaming'. However, I'm struggling to grasp how to handle the onChange function effectively for this additional dropdown field.

If you have any insights or suggestions on how to tackle this issue, I would greatly appreciate your input. Thank you!

javascript typescript material-ui

Answer 1

Answer №1

When the state in React is changed, such as when setLocationNaming is called, the render function will be re-executed to display a different output. As mentioned by @mstephen19, the return value of your function can depend on both props and state. Here is a simple (untested) example:

const MyConditionalRender = () => {
  const [showMoreContent, setShowMoreContent] = useState(false);

  return (
    <div>
      <button onClick={() => setShowMoreContent(true)}>Show</button>
      {showMoreContent && (
        <p>More Content, like an extra dropdown for the department.</p>
      )}
    </div>
  );
};

For further understanding, refer to the Conditional Rendering documentation shared by mstephen19.

Answer 2

When the state in React is changed, such as when setLocationNaming is called, the render function will be re-executed to display a different output. As mentioned by @mstephen19, the return value of your function can depend on both props and state. Here is a simple (untested) example:

const MyConditionalRender = () => {
  const [showMoreContent, setShowMoreContent] = useState(false);

  return (
    <div>
      <button onClick={() => setShowMoreContent(true)}>Show</button>
      {showMoreContent && (
        <p>More Content, like an extra dropdown for the department.</p>
      )}
    </div>
  );
};

For further understanding, refer to the Conditional Rendering documentation shared by mstephen19.

Handling onChange events for several typescript <Select> elements

Answer №1

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