Can you provide information on the type signature of the `onChange` event for the MUI DatePicker?

Question

Can you provide information on the type signature of the `onChange` event for the MUI DatePicker?

I am utilizing an instance of the MUI DatePicker along with a MomentAdapter:

import *, {useState} as React from 'react';
import TextField from '@mui/material/TextField';
import { AdapterMoment } from '@mui/x-date-pickers/AdapterMoment';

import { LocalizationProvider } from '@mui/x-date-pickers/LocalizationProvider';
import { DatePicker } from '@mui/x-date-pickers/DatePicker';
import { Moment } from 'moment';

function App() {

  const [value, setValue] = useState<Moment | null>();

  return (
    <LocalizationProvider dateAdapter={AdapterMoment}>
      <DatePicker
        value={value}
        onChange={(date: Moment | null) => {
          setValue(date);
          console.log(date);
        }}
        renderInput={(params) => <TextField {...params} />}
      />
    </LocalizationProvider>
  )
}

The content of date appears to be a type of Moment object, evident through inspection in the console:

https://i.sstatic.net/ZXqE5.png

However, TypeScript is flagging an error as it expects a Date object instead.

(Interestingly, there are discrepancies when testing this code sourced from MUI documentation on a StackBlitz, where the value does appear to be a date. The issue is compounded by the fact that the StackBlitz console doesn't display objects effectively.)

What should be the appropriate type signature for the function onChange in this scenario?

typescript material-ui datepicker

Answer 1

Answer №1

The onChange attribute can be found within the

UsePickerValueBaseProps<TValue, TError>

interface and is described as follows:

onChange?: (value: TValue, context: PickerChangeHandlerContext<TError>) => void;

The TValue parameter is derived from the DatePicker component itself, allowing you to define it within the component for proper typing of the onChange method:

<DatePicker<Moment>
  onChange={(date: Moment | null) => {
    setValue(date);
    console.log(date);
  }}
/>

If not specified, an error will occur because TValue defaults to type Date.

Answer 2

The onChange attribute can be found within the

UsePickerValueBaseProps<TValue, TError>

interface and is described as follows:

onChange?: (value: TValue, context: PickerChangeHandlerContext<TError>) => void;

The TValue parameter is derived from the DatePicker component itself, allowing you to define it within the component for proper typing of the onChange method:

<DatePicker<Moment>
  onChange={(date: Moment | null) => {
    setValue(date);
    console.log(date);
  }}
/>

If not specified, an error will occur because TValue defaults to type Date.

Answer 3

Answer №2

It's evident that the date variable holds a Moment object, as I confirmed by inspecting it in the console.

Keep in mind that when you set the value to a Moment object yourself, the internal type used by the component may not match the type you are providing. The console.log(value) statement checks the type of your value variable, not the new date being passed in by the component.

Your onChange method should look something like this:

onChange={(date: Date | null) => {
          setValue(date);
          console.log(`${date} has type ${typeof date}`);
        }}

If you update it as shown above, check if it now displays a Date type.

Answer 4

It's evident that the date variable holds a Moment object, as I confirmed by inspecting it in the console.

Keep in mind that when you set the value to a Moment object yourself, the internal type used by the component may not match the type you are providing. The console.log(value) statement checks the type of your value variable, not the new date being passed in by the component.

Your onChange method should look something like this:

onChange={(date: Date | null) => {
          setValue(date);
          console.log(`${date} has type ${typeof date}`);
        }}

If you update it as shown above, check if it now displays a Date type.

Can you provide information on the type signature of the `onChange` event for the MUI DatePicker?

Answer №1

Answer №2

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