30 seconds of React

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ControlledInput

inputstateeffectintermediate

Renders an <input> element with internal state, that uses a callback function to pass its value to the parent component.

  • Use object destructuring to set defaults for certain attributes of the <input> element.
  • Use the React.setState() hook to create the value state variable and give it a value of equal to the defaultValue prop.
  • Use the React.useEffect() hook with a second parameter set to the value state variable to call the callback function every time value is updated.
  • Render an <input> element with the appropriate attributes and use the the onChange event to upda the value state variable.
function ControlledInput({
  callback,
  type = 'text',
  disabled = false,
  readOnly = false,
  defaultValue,
  placeholder = ''
}) {
  const [value, setValue] = React.useState(defaultValue);

  React.useEffect(() => {
    callback(value);
  }, [value]);

  return (
    <input
      defaultValue={defaultValue}
      type={type}
      disabled={disabled}
      readOnly={readOnly}
      placeholder={placeholder}
      onChange={({ target: { value } }) => setValue(value)}
    />
  );
}