falcon-form

Form handling and error validation in React hooks.

Install

npm install --save falcon-form

Demo

Codesandbox here

Features

• No Wrapper | No HOC | Just KISS.
• Your design, our logics.
• Specific message for custom conditionals.
• React-native support.
• Tiny bundle with no dependencies.
• native HTML support.

Usage

import React, { useState } from "react";
import falconForm, { isRequired, isEmail, checkboxHelper } from "falcon-form";
 
var renderCount = 0;
 
const App = () => {
  let [formInitialValues] = useState({
    email: "",
    name: "",
    department: []
  }); // getInitialValues, use setFormInitialValues to set data from API
 
  const formSubmitAction = values => {
    console.log("Form submitted", values);
  }; // declare submit success action
 
  const fieldValidators = {
    email: [isRequired, isEmail],
    name: [isRequired]
  }; // declare field validators
 
  const { values, errors, fieldChange, formSubmit } = falconForm(
    formInitialValues,
    formSubmitAction,
    fieldValidators
  );
  // pass initial values, submit actions, field validators
  // use values, errors and field handlers in form
 
  renderCount += 1;
  return (
    <div>
      <h4>Render count : {renderCount}</h4>
      <form onSubmit={formSubmit}>
        Name:
        <br />
        <input
          type="text"
          name="name"
          onChange={fieldChange}
          value={values.name}
        />
        {errors.name}
        <br />
        Email:
        <br />
        <input
          type="email"
          name="email"
          onChange={fieldChange}
          value={values.email}
        />
        {errors.email}
        <br />
        <br />
        <input
          type="checkbox"
          name="department"
          id="ece"
          value="ece"
          checked={checkboxHelper(values.department, "ece")}
          onChange={fieldChange}
        /> ECE
        <input
          type="checkbox"
          name="department"
          id="cse"
          value="cse"
          checked={checkboxHelper(values.department, "cse")}
          // checkboxHelper equivalent to values.department.includes('ece'), with single checkbox support
          onChange={fieldChange}
        />{" "}
        CSE
        <input type="submit" value="Submit" />
      </form>
    </div>
  );
};
 
export default App;

Create custom validations

import { customValidation } from "falcon-form";
 
// create custom validation function
// all form values available as second param
const min3CharRule = value => value.length < 3;
 
const stringMin3Char = customValidation(
  min3CharRule,
  "Minimum 3 letters required"
);
 
// Pass these validations to fieldValidators

License

MIT © varunthefalcon

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