React Usestate Update Simple Version - Nested Object Form Field Onchange Input

This is the very simple version to show how to update useState from a input field form. [5198], Last Updated: Mon Jun 24, 2024

cathy

Mon Sep 04, 2023

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This is where you have multiple nested form object.

The value of textarea here is update to form.

Object Example:

const [form, setForm] = useState(
 {
mathType: { 
        value: 'The textarea content default value'
     },
 });

The setForm updates form.mathType.value on Change

<textarea
onChange={(e) =>setForm( {...form, ['mathType']: {
  ...form['mathType'],
 value: e.target.value
       }
})}
></textarea>