1 reply

Next.js Client Side Conditional State

I have a Next.js app with a client side part of the app. The form takes a min and max from the user. Using that, I render a form with (max - min) inputs. I validate the input for the max and min to make sure the (max - min) always returns a positive number.

To render the form, I create a type using

numberOfQuestions

numberOfQuestions

and create a React State.

const questionsSchema = numericEnum(Options)
  .optional()
  .array()
  .length(numberOfQuestions)
const defaultState: z.infer<typeof questionsSchema> = Array(
  numberOfQuestions,
).map((_) => undefined)
const [answers, setAnswers] =
  useState<z.infer<typeof questionsSchema>>(defaultState)

const questionsSchema = numericEnum(Options)
  .optional()
  .array()
  .length(numberOfQuestions)
const defaultState: z.infer<typeof questionsSchema> = Array(
  numberOfQuestions,
).map((_) => undefined)
const [answers, setAnswers] =
  useState<z.infer<typeof questionsSchema>>(defaultState)

This works fine in dev since previous validation makes sure the

numbeOfQuestions

numbeOfQuestions

is never NaN. However, when I try to next build, I guess next tries to run it and

numberOfQuestions

numberOfQuestions

is NaN giving me an

RangeError: Invalid array length

RangeError: Invalid array length

.

So now I decided return before this ^ if

numberOfQuestions

numberOfQuestions

is NaN

if (typeof numberOfQuestions !== "number") {
  return (
    <div>
      <p>Error: Max questions not greater than min questions.</p>
    </div>
  )
}

if (typeof numberOfQuestions !== "number") {
  return (
    <div>
      <p>Error: Max questions not greater than min questions.</p>
    </div>
  )
}

However, this means I'm "conditionally setting state" which is not allowed.

React Hook "useState" is called conditionally. React Hooks must be called in the exact same order in every component render. Did you accidentally call a React Hook after an early return?eslintreact-hooks/rules-of-hooks

React Hook "useState" is called conditionally. React Hooks must be called in the exact same order in every component render. Did you accidentally call a React Hook after an early return?eslintreact-hooks/rules-of-hooks

https://reactjs.org/docs/hooks-rules.html

Any ideas on how I can fix this?

Rules of Hooks – React

A JavaScript library for building user interfaces

Next.js Client Side Conditional State

numberOfQuestions

numberOfQuestions

and create a React State.

const questionsSchema = numericEnum(Options)
  .optional()
  .array()
  .length(numberOfQuestions)
const defaultState: z.infer<typeof questionsSchema> = Array(
  numberOfQuestions,
).map((_) => undefined)
const [answers, setAnswers] =
  useState<z.infer<typeof questionsSchema>>(defaultState)

const questionsSchema = numericEnum(Options)
  .optional()
  .array()
  .length(numberOfQuestions)
const defaultState: z.infer<typeof questionsSchema> = Array(
  numberOfQuestions,
).map((_) => undefined)
const [answers, setAnswers] =
  useState<z.infer<typeof questionsSchema>>(defaultState)

This works fine in dev since previous validation makes sure the

numbeOfQuestions

numbeOfQuestions

is never NaN. However, when I try to next build, I guess next tries to run it and

numberOfQuestions

numberOfQuestions

is NaN giving me an

RangeError: Invalid array length

RangeError: Invalid array length

.

So now I decided return before this ^ if

numberOfQuestions

numberOfQuestions

is NaN

if (typeof numberOfQuestions !== "number") {
  return (
    <div>
      <p>Error: Max questions not greater than min questions.</p>
    </div>
  )
}

if (typeof numberOfQuestions !== "number") {
  return (
    <div>
      <p>Error: Max questions not greater than min questions.</p>
    </div>
  )
}

However, this means I'm "conditionally setting state" which is not allowed.

React Hook "useState" is called conditionally. React Hooks must be called in the exact same order in every component render. Did you accidentally call a React Hook after an early return?eslintreact-hooks/rules-of-hooks

React Hook "useState" is called conditionally. React Hooks must be called in the exact same order in every component render. Did you accidentally call a React Hook after an early return?eslintreact-hooks/rules-of-hooks

https://reactjs.org/docs/hooks-rules.html

Any ideas on how I can fix this?

Rules of Hooks – React

A JavaScript library for building user interfaces

Next.js Client Side Conditional State

Next.js Client Side Conditional State

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