npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@shanewas/form-validation

v1.3.3

Published

A powerful and flexible validation engine for forms with support for complex rules, dependencies, and custom validations.

Downloads

1,055

Readme

@shanewas/form-validation

npm version
License: GPL v3
Node.js Version

A powerful and flexible validation engine for forms with support for complex rules, dependencies, type validation, and custom validation logic.


Features

  • Comprehensive Validation Types: Supports required fields, comparisons, dependencies, type checking, regex, and more.
  • Flexible Actions: Execute form actions like CLEAR_FORMFIELD, UPDATE_VALUE, or custom actions based on validations.
  • Complex Field Dependencies: Define validations based on the values of other fields.
  • Custom Validations: Implement application-specific validation logic.
  • Detailed Error Reporting: Easy-to-understand validation results.
  • Flexible Rule Structure: Configure validations using a simple and extensible rule schema.
  • Works Everywhere: Compatible with both Node.js and browsers.

Installation

Install via npm:

npm install @shanewas/form-validation

Quick Start

import { ValidationController } from "@shanewas/form-validation";

// Initialize the validator
const validator = new ValidationController();

// Define form data
const formData = {
  name: { fieldId: "name", value: "john" },
  age: { fieldId: "age", value: 18 },
  email: { fieldId: "email", value: "[email protected]" },
};

// Define validation rules
const rules = [
  {
    ruleId: "userValidation",
    conditions: [
      {
        fieldId: "name",
        type: "REQUIRED",
        errorMessage: "Name is required",
      },
      {
        fieldId: "age",
        type: "COMPARISON",
        operator: "GREATER_THAN",
        value: 17,
        errorMessage: "Must be 18 or older",
      },
    ],
  },
];

// Validate
(async () => {
  try {
    const result = await validator.validateForm(formData, rules);
    console.log(result);
  } catch (error) {
    console.error("Validation failed:", error);
  }
})();

Validation Types

  • REQUIRED: Ensure the field is not empty.
  • COMPARISON: Compare field values using supported operators.
  • DEPENDENCY: Validate a field based on another field's value.
  • TYPE_CHECK: Check the field value's data type.
  • LENGTH_CHECK: Validate the length of string or array fields.
  • EMPTY_CHECK: Ensure fields are empty or non-empty.
  • REGEX: Match field values against regular expressions.
  • CUSTOM: Apply user-defined validation functions.

Rule Structure

Rules are defined as objects and support a wide range of properties:

{ ruleId: string, conditions: [ { fieldId: string, type: string, operator: string, value: any, expectedType: string, minLength: number, maxLength: number, dependentFieldId: string, dependentOperator: string, dependentValue: any, action: string, // e.g., "CLEAR_FORMFIELD", "UPDATE_VALUE" actionValue: any, // Additional data for the action errorMessage: string, description: string, }, ], }


Actions

The following actions are supported for rule conditions:

  • CLEAR_FORMFIELD: Clears the value of the specified field.
  • UPDATE_VALUE: Updates the field's value to a specified value.
  • Custom Actions: Define custom actions in your implementation.

Operators

The following operators are supported in COMPARISON and DEPENDENCY validations:

  • EQUALS
  • NOT_EQUALS
  • GREATER_THAN
  • LESS_THAN
  • GREATER_THAN_OR_EQUAL
  • LESS_THAN_OR_EQUAL
  • CONTAINS
  • STARTS_WITH
  • ENDS_WITH
  • BETWEEN
  • EMPTY
  • NOT_EMPTY

Advanced Usage

Custom Validation

You can define your own validation logic using the CUSTOM type:

const rules = [
  {
    ruleId: "passwordValidation",
    conditions: [
      {
        fieldId: "password",
        type: "CUSTOM",
        customFunction: async (value, formData) => {
          return value.length < 8
            ? "Password must be at least 8 characters"
            : null;
        },
      },
    ],
  },
];

Dependent Fields

Validate a field based on the value of another field using DEPENDENCY:

const rules = [
  {
    ruleId: "dependencyCheck",
    conditions: [
      {
        fieldId: "state",
        type: "DEPENDENCY",
        dependentFieldId: "country",
        dependentOperator: "EQUALS",
        dependentValue: "USA",
        errorMessage: "State is required for USA",
      },
    ],
  },
];

Validation Result

The validation result provides detailed information about errors:

{
  hasErrors: true,
  errorCount: 2,
  details: {
    name: [{ message: "Name is required", type: "REQUIRED" }],
    age: [{ message: "Must be 18 or older", type: "COMPARISON" }],
  },
  summary: [
    { type: "error", fieldId: "name", message: "Name is required" },
    { type: "error", fieldId: "age", message: "Must be 18 or older" },
  ],
}

Example Validation with All Types

const formData = {
  username: { fieldId: "username", value: "" },
  age: { fieldId: "age", value: 17 },
  email: { fieldId: "email", value: "invalid-email" },
};

const rules = [
  {
    fieldId: "username",
    type: "REQUIRED",
    errorMessage: "Username is required",
  },
  {
    fieldId: "age",
    type: "COMPARISON",
    operator: "GREATER_THAN",
    value: 18,
    errorMessage: "Must be 18 or older",
  },
  {
    fieldId: "email",
    type: "REGEX",
    value: /^[^\s@]+@[^\s@]+\.[^\s@]+$/,
    errorMessage: "Invalid email format",
  },
];

(async () => {
  try {
    const result = await validator.validateForm(formData, rules);
    console.log(result);
  } catch (error) {
    console.error("Validation failed:", error);
  }
})();

Requirements

  • Node.js: Version 16 or later.
  • Browser Support: ES Modules and modern browsers.

Contributing

We welcome contributions! Please see our Contributing Guidelines.


License

This project is licensed under the GNU General Public License v3.0. See the LICENSE file for details.


Support


Acknowledgments

Special thanks to all contributors for their efforts in making this library robust and versatile!