React Native Academy · Ders

Form Durumuyla Çok Adımlı Formlar

Uzun bir kayıt formunu, durumdaki adım sayacını kullanarak birden çok adıma bölün ve sonraki adıma geçmeden önce yalnızca geçerli adımdaki alanları doğrulayın.

Form Durumuyla Çok Adımlı Formlar, CoddyKit'te ücretsiz bir React Native Academy dersidir. Bu, 4 dersinin 3. dersidir. Aşağıdan dersin tamamını ücretsiz okuyabilir, sonra tarayıcıda yerleşik kod editörü ve 7/24 yapay zeka koçu ile uygulamalı olarak pratik yapabilirsin. Bu, React Native Academy öğrenme yolunun bir parçasıdır ve ilerlemeniz web ve CoddyKit uygulaması arasında senkronize olur. React Native Academy kursu toplamda 4 dersten oluşur.

Bu dersin bazı bölümleri henüz çevrilmemiş olup İngilizce olarak gösterilmektedir.

What Is a Multi-Step Form?

A multi-step form breaks a long registration or checkout flow into discrete, manageable steps — typically 2 to 5 screens. Each step focuses on a related group of fields, reducing cognitive load and improving completion rates compared to a single long scroll. Common examples include onboarding wizards, address-plus-payment checkout flows, and multi-stage profile setup.

Sharing One Form Instance Across Steps

The key to a multi-step form with react-hook-form is to create one useForm instance for the entire form and pass control and errors down as props to each step component. This keeps all field values and validation state in one place. Values entered on step 1 remain available when the user reaches step 3, and submitting the final step accesses the complete form data.

interface RegisterForm {
  name: string;
  email: string;
  password: string;
  phone: string;
  city: string;
}

export default function RegisterScreen() {
  const [step, setStep] = React.useState(1);
  const form = useForm<RegisterForm>({ defaultValues: { name: '', email: '', password: '', phone: '', city: '' } });

  return (
    <View style={styles.container}>
      {step === 1 && <Step1AccountInfo form={form} />}
      {step === 2 && <Step2ContactDetails form={form} />}
      {step === 3 && <Step3Review form={form} onSubmit={handleFinalSubmit} />}
    </View>
  );
}

Defining Step Component Props

Each step component receives the form instance as a prop. Define a TypeScript type for the prop using UseFormReturn from react-hook-form. This gives the step component access to control, formState.errors, trigger, and watch — all the tools needed to render and validate its own subset of fields.

import type { UseFormReturn } from 'react-hook-form';

interface StepProps {
  form: UseFormReturn<RegisterForm>;
  onNext?: () => void;
}

export function Step1AccountInfo({ form, onNext }: StepProps) {
  const { control, formState: { errors } } = form;
  // Render only name, email, and password fields
}

Validating Only the Current Step

Before advancing to the next step, validate only the fields on the current step using form.trigger(['fieldA', 'fieldB']). This runs validation on the specified fields and returns a Promise that resolves to true if all are valid. If any fail, the errors appear and the user cannot advance until they are fixed. Fields on later steps are not validated yet.

async function handleNext() {
  const step1Fields: (keyof RegisterForm)[] = ['name', 'email', 'password'];
  const isValid = await form.trigger(step1Fields);
  if (isValid) {
    setStep(2);
  }
  // If invalid, formState.errors is populated for the listed fields
}

Progress Indicator UI

Add a visual progress bar or step indicator at the top of the screen so users know how far along they are. Calculate progress as (currentStep / totalSteps) * 100. A simple progress bar using an animated View width gives clear feedback and sets expectations about how much more is required before they can complete the form.

const TOTAL_STEPS = 3;

function ProgressBar({ current }: { current: number }) {
  const progress = (current / TOTAL_STEPS) * 100;
  return (
    <View style={styles.progressContainer}>
      <View style={[styles.progressFill, { width: progress + '%' }]} />
    </View>
  );
}

// Usage:
<ProgressBar current={step} />

Navigating Between Steps

Use a step counter in useState to track the current step. 'Next' buttons validate the current step's fields with trigger before incrementing the step. 'Back' buttons decrement the step without re-validating. Always disable the 'Next' button or show a loading spinner while async validation (like username availability checks) is in progress.

const { formState: { isValidating } } = form;

function NavigationButtons() {
  return (
    <View style={styles.navRow}>
      {step > 1 && (
        <Button title='Back' onPress={() => setStep((s) => s - 1)} />
      )}
      {step < TOTAL_STEPS ? (
        <Button
          title={isValidating ? 'Checking...' : 'Next'}
          onPress={handleNext}
          disabled={isValidating}
        />
      ) : (
        <Button title='Submit' onPress={form.handleSubmit(onFinalSubmit)} />
      )}
    </View>
  );
}

Reviewing Entered Data on the Final Step

The final step is often a review screen where users confirm their entries before submitting. Use form.getValues() to read all field values and display them in a summary list. This gives users one last chance to catch typos before the data is sent to the server, reducing support requests and user errors.

function Step3Review({ form, onSubmit }: StepProps) {
  const values = form.getValues();

  return (
    <ScrollView>
      <Text>Review your information:</Text>
      <Text>Name: {values.name}</Text>
      <Text>Email: {values.email}</Text>
      <Text>Phone: {values.phone}</Text>
      <Text>City: {values.city}</Text>
      <Button title='Confirm and Register' onPress={onSubmit} />
    </ScrollView>
  );
}

Using formState.isSubmitting

formState.isSubmitting is true while handleSubmit's async callback is running. Use it to disable the submit button and show a loading spinner during the API call. This prevents double-submissions when the user taps quickly and gives clear feedback that the form is being processed.

const { formState: { isSubmitting } } = form;

<Button
  title={isSubmitting ? 'Submitting...' : 'Confirm and Register'}
  onPress={form.handleSubmit(onFinalSubmit)}
  disabled={isSubmitting}
/>

Persisting Step Data Across Navigation

If users navigate away from the multi-step form and return later, use Zustand or React Navigation's route params to preserve the current step and partially filled form data. Combine this with react-hook-form's reset(savedValues) to restore the form to where the user left off. This dramatically reduces form abandonment on mobile.

// On unmount or navigation away:
useEffect(() => {
  return () => {
    const currentValues = form.getValues();
    useFormDraftStore.getState().saveDraft(currentValues, step);
  };
}, []);

// On mount, restore if draft exists:
useEffect(() => {
  const draft = useFormDraftStore.getState().draft;
  if (draft) {
    form.reset(draft.values);
    setStep(draft.step);
  }
}, []);

Keyboard Navigation Between Fields

On mobile, tapping 'Next' on the keyboard should move focus to the next input within a step. Use useRef to hold refs for each TextInput and call ref.current.focus() in the onSubmitEditing callback of each input. Set returnKeyType='next' on intermediate fields and 'done' on the last field of each step.

const emailRef = React.useRef<TextInput>(null);
const passwordRef = React.useRef<TextInput>(null);

<TextInput
  placeholder='Full Name'
  returnKeyType='next'
  onSubmitEditing={() => emailRef.current?.focus()}
/>
<TextInput
  ref={emailRef}
  placeholder='Email'
  returnKeyType='next'
  onSubmitEditing={() => passwordRef.current?.focus()}
/>
<TextInput
  ref={passwordRef}
  placeholder='Password'
  returnKeyType='done'
  onSubmitEditing={handleNext}
  secureTextEntry
/>

Handling Back Navigation Safely

When the user presses the hardware back button on Android or swipes back on iOS, handle it to decrement the step counter instead of leaving the screen entirely. Use useFocusEffect with a BackHandler to intercept the hardware back event. If the user is on step 1, allow normal navigation back to the previous screen.

import { BackHandler } from 'react-native';
import { useFocusEffect } from '@react-navigation/native';

useFocusEffect(
  React.useCallback(() => {
    const handler = BackHandler.addEventListener('hardwareBackPress', () => {
      if (step > 1) {
        setStep((s) => s - 1);
        return true; // prevent default back navigation
      }
      return false; // allow default (exit screen)
    });
    return () => handler.remove();
  }, [step])
);

Quick Check

Test your understanding of React Native Mobile Development concepts from this lesson.

Lesson Recap

In this lesson you learned: one useForm instance shared across all steps keeps form data and validation state unified, trigger with specific field names validates only the current step before advancing, and formState.isSubmitting disables the submit button during the final API call to prevent duplicate submissions. Next up we explore submitting and resetting forms.

Sıkça Sorulan Sorular

“Form Durumuyla Çok Adımlı Formlar” dersi ücretsiz mi?

Evet — “Form Durumuyla Çok Adımlı Formlar” dersin tüm metni burada web'de ücretsiz olarak okunabilir. Etkileşimli olarak pratik yapmak (yerleşik kod editörü ve 7/24 yapay zeka koçu) ve React Native Academy kursunun geri kalanını açmak için CoddyKit PRO'ya yükselt. React Native Academy kursu toplamda 4 dersten oluşur.

“Form Durumuyla Çok Adımlı Formlar” dersinde ne öğreneceğim?

Uzun bir kayıt formunu, durumdaki adım sayacını kullanarak birden çok adıma bölün ve sonraki adıma geçmeden önce yalnızca geçerli adımdaki alanları doğrulayın. React Native Academy ile uygulamalı kodu tarayıcıda doğrudan çalıştırarak pratik yaparsın ve 7/24 yapay zeka koçu dersi çalışırken sorularını yanıtlar.

React Native Academy öğrenmeye başlamak için deneyim gerekli mi?

Önceden deneyim gerekmez. CoddyKit'te React Native Academy, başlangıçtan ileri seviyeye kadar yapılandırıldığı için buradan başlayabilir veya başından başlayıp kendi hızında ilerleme yapabilirsin. Bu, 4 dersinin 3. dersidir.

“Form Durumuyla Çok Adımlı Formlar” dersi ne kadar sürer?

Çoğu CoddyKit dersi yaklaşık 5–10 dakika sürer. Her biri kısa ve etkileşimli olduğu için sabit ilerleme yaparsın ve web ile uygulama arasında tam olarak bıraktığın yerden devam edebilirsin.

Bu React Native Academy dersinde kod yazıp çalıştırabilir miyim?

Evet. Her React Native Academy dersi yerleşik bir kod editörü içerir, bu sayede tarayıcıda gerçek kod yazıp çalıştırabilir ve anlık yapay zeka geri bildirimi alırsın — yerel kurulum gerekli değildir.

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