rn-auto-scroll-form

A Simple and fully customizable to handle Form in React Native. This library inspired by Formik.

Example

You can check Example code in this link

Features

• Auto scroll to first error field
• Manage, track state & values of fields
• Supports validations using yup
• Supports custom components

Getting Started

• Installation
• Usage
  • Basic Usage
  • Function useFormController
  • Custom Component
  • Create Custom Wrapper Component
• API Reference
  • FormController
  • useFormController
  • FormContext
  • Field
• Example

Installation

you can install using npm:

npm i rn-auto-scroll-form

Usage

Basic Usage

import { FormController } from 'rn-auto-scroll-form';

create validation using yup

  const schema = yup.object().shape({
    email: yup.string().email().required(),
    password: yup.string().min(6).required(),
  });

<FormController
  initialValue={{email: '', password: ''}}
  validationSchema={schema}
  onSubmit={({isValid, values, firstErrAt}) => console.warn(values)}>
{({
  values,
  errors,
  refs,
  handleChange,
  handleBlur,
  handleSubmit,
  }) => {
    return (
      <View style={styles.content}>
        <TextInput
          ref={refs?.email}
          style={styles.textInput}
          placeholder="Email"
          onChangeText={handleChange('email')}
          onBlur={handleBlur('email')}
          value={values?.email}
        />
        {!!errors.email && <Text>{errors.email}</Text>}
        <TextInput
          ref={refs?.password}
          style={styles.textInput}
          placeholder="Password"
          onChangeText={handleChange('password')}
          onBlur={handleBlur('password')}
          value={values?.password}
        />
        {!!errors.password && <Text style={styles.errText}>{errors.password}</Text>}
        <Button onPress={handleSubmit} title="Submit" />
      </View>
    );
  }}
</FormController>

Function useFormController

import { useFormController, ScrollableView, Field } from 'rn-auto-scroll-form';

  const schema = yup.object().shape({
    email: yup.string().email().required(),
    password: yup.string().min(6).required(),
  });

  const myform = useFormController({
    initialValues: initialValue,
    enableReinitialize: true,
    validationSchema: schema,
    onSubmit: ({isValid, values, firstErrAt}) => {
      console.log({isValid, values, firstErrAt});
    },
  });

<ScrollableView ref={myform?.controller}>
  <View style={styles.content}>
    <Text
      style={
        styles.title
      }>{`${myform?.count?.count}/${myform?.count?.total}`}</Text>
    <Field component={MyField} label="Email" name="email" form={myform} />
    <Field component={MyField} label="Password" name="password" form={myform} />

    ...

    <Button onPress={myform.handleSubmit} title="Submit" />
  </View>
</ScrollableView>

Custom Component

this is example of custom component, make sure your custom component have props onChangeText onBlur value error (optional)

export const MyField = props => {
  const {style, error, label, ...otherProps} = props;
  return (
    <>
      <Text>{label}</Text>
      <TextInput style={[styles.textInput, style]} {...otherProps} />
      {!!error && <Text style={styles.errText}>{error}</Text>}
    </>
  );
};

import { FormController, Field } from 'rn-auto-scroll-form';

you dont need to handle onChangeText, etc anymore. that is handle at Field Wrapper Component

<FormController
  initialValue={{email: '', password: ''}}
  validationSchema={schema}
  onSubmit={({isValid, values, firstErrAt}) => console.warn(values)}>
{({
  handleSubmit,
  }) => {
    return (
      <View style={styles.content}>
        <Field
          label="Email"
          placeholder="Input your email"
          name="name"
          component={MyField}
        />
        <Field
          label="Password"
          placeholder="Input your password"
          component={MyField}
        />
        <Button onPress={handleSubmit} title="Submit" />
      </View>
    );
  }}
</FormController>

Create Custom Wrapper Component

you can create wrapper component for your component that dont have props onChangeText onBlur value.

in this example you need to get all data with useContext(FormContext) and mapping to your custom component value errText onChangeValue.

make sure your custom component have props name or whatever your naming that prop (to handle getting specific data)

import { FormContext } from 'rn-auto-scroll-form';

export const YourWrapField = ({ component: Component, name, ...props }) => {
    const ctx = useContext(FormContext);
    return (
        <View style={{ width: '100%' }} ref={ctx?.refs[name]}>
            <Component
                value={ctx?.values[name]}
                errText={ctx?.errors[name]}
                onChangeValue={ctx?.handleChange(name)}
                {...props}
            />
        </View>
    )
}

API Reference

FormController

Props

Property	Required	Type	Default
children	yes	((context: FormContext) => React.ReactNode)	-
initialValues	yes	Values	-
validationSchema	No	`Schema	(() => Schema)`
validateOnBlur	No	bool	true
validateOnChange	No	bool	false
enableReinitialize	No	bool	false
countRequiredOnly	No	bool	true
autoscroll	No	bool	true
countingFields	No	Array[String]	null

useFormController

Params when using useFormController

type UseFormParams<T> = {
  initialValues: T;
  validationSchema: any;
  onSubmit: (params: SubmitParams<T>) => void;
  countRequiredOnly?: boolean;
  countingFields?: string[];
  validateOnChange?: boolean;
  validateOnBlur?: boolean;
  enableReinitialize?: boolean;
  autoscroll?: boolean;
};

params onSubmit

type SubmitParams<T> = {
  isValid: boolean;
  values: GenericObj<T>;
  firstErrAt?: string | null;
};

FormContext

Form Context

interface FormContext<T> {
  values: T;
  errors?: T;
  count: Count;
  refs?: T;
  controller: React.Ref<ScrollableView>;
  handleChange: (txt: string) => void;
  handleBlur: (txt: string) => void;
  handleSubmit: (refs: T) => void;
}

interface Count {
  count: number;
  total: number;
}

Field

you can use TextInputProps at Field Component

Property	Required	Type
name	yes	string

Contributing

Pull requests are always welcome! Feel free to open a new GitHub issue for any changes that can be made.

Working on your first Pull Request? You can learn how from this free series How to Contribute to an Open Source Project on GitHub

Author

Egi Wibowo | egiwibowo13

License

MIT