react-native-form-container v1.0.46

React Native Form Container

The purpose of this project is to provide a simple and flexible form validation library for React Native applications. With this library, developers can easily implement form validation logic and handle errors in their React Native forms.

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Installation

react-native-form-container

react-native-form-container is a simple and customizable form container component for React Native. This library simplifies form validation and manages form elements efficiently.

Features

• Easy form management
• Flexible and customizable
• Simple validation for form elements

Installation

To add the react-native-form-container library to your project, use the following command:

npm install react-native-form-container

Usage

Below is an example showing how to use the react-native-form-container library.

Basic Usage

import React, { useState, useRef } from "react";
import { View, Text, SafeAreaView, Button } from "react-native";
import FormContainer, {   FormContainerRef,   FormInput, } from 'react-native-form-container';


export default function App() {
  const formContainerRef = useRef<FormContainerRef>(null);
  const [firstName, setFirstName] = useState("");
  const [lastName, setLastName] = useState("");

  return (
    <SafeAreaView>
      <FormContainer
        style={{ gap: 10, margin: 10 }}
        formContainerRef={formContainerRef}
      >
        <FormInput
          value={firstName}
          onChangeText={setFirstName}
          placeholder="First Name"
          id="firstName"
          required
        />
        <FormInput
          placeholder="Last Name"
          value={lastName}
          onChangeText={setLastName}
          id="lastName"
          required
        />
      </FormContainer>
      <Button
        onPress={() => {
          const errorMessages = {
            firstName: "Please enter your first name",
            lastName: "Please enter your last name",
          };
          const result = formContainerRef.current?.validate(errorMessages);
          console.log(result);
        }}
        title="Save"
      />
    </SafeAreaView>
  );
}

Form Validation

To trigger form validation, use the validate method of the form container reference. This method checks the validity of the fields and returns appropriate error messages for invalid fields.

const result = formContainerRef.current?.validate(errorMessages);
console.log(result);

Error Messages

You can pass error messages as an object to the validate method for each input component. For example:

const errorMessages = {
  firstName: "Please enter your first name",
  lastName: "Please enter your last name",
};

validate(errorMessages)

Method: validate(errorMessages: object) -> boolean

This method validates the validity of inputs in the form.

Parameters:

• errorMessages: An object. Each key represents an input's identifier (ID), and its value is an error message.

Return Value:

• true: If all inputs are valid.
• false: If at least one input is invalid or the errorMessages parameter is not a valid object.

Example Usage:

const errorMessages = {
  firstName: "Please enter your first name",
  lastName: "Please enter your last name",
};

const result = formContainerRef.current?.validate(errorMessages);

Alternative Input Component

In this example, an alternative input component named AlternativeInput is defined. This component accepts props of type FormInputProps, which presumably includes properties required by a form input component.

Usage:

To use AlternativeInput, simply pass the necessary props expected by a form input component.

import React, { useState, useRef } from "react";
import { View, Text, SafeAreaView, Button, TextInput } from "react-native";
import FormContainer, {
  FormContainerRef,
  FormInputProps,
} from "react-native-form-container";
export default function App() {
  const formContainerRef = useRef < FormContainerRef > null;
  const [firstName, setFirstName] = useState("");
  const [lastName, setLastName] = useState("");
  const AlternativeInput = (props: FormInputProps) => {
    return (
      <View>
        <TextInput
          style={{
            borderWidth: 1,
            borderColor: "black",
            padding: 10,
            borderRadius: 5,
          }}
          {...props}
        />
        <View style={{ marginTop: 10 }}>
          {props.errorMessage && <Text>{props.errorMessage}</Text>}
        </View>
      </View>
    );
  };
  return (
    <SafeAreaView>
      <FormContainer
        style={{ gap: 10, margin: 10 }}
        formContainerRef={formContainerRef}
      >
        <AlternativeInput
          id="firstName"
          value={firstName}
          onChangeText={setFirstName}
          placeholder="First Name"
          required
        />
        <AlternativeInput
          placeholder="Last Name"
          value={lastName}
          onChangeText={setLastName}
          id="lastName"
          required
        />
      </FormContainer>

      <Button
        onPress={() => {
          const errorMessages = {
            firstName: "Please enter your first name",
            lastName: "Please enter your last name",
          };
          formContainerRef.current?.validate(errorMessages);
        }}
        title="Save"
      />
    </SafeAreaView>
  );
}

FormInputProps

The FormInput component accepts the following props:

passwordOptions

When the validation prop is set to password, the following passwordOptions can be specified:

These validation rules are optional but can be specified to enforce stricter password criteria.