javascript-form-validator

Very small form validator.

Usage

Create a form and add fields insite div tags. You can add div tags with data-error right next to the input to display error messages.

options.regexes

An object of regexes to validate all the inputs.

options.errors

An object of error messages to show when inputs are invalid. There is a default value which is displayed when no options.errors matches with input[data-validation] and no input[data-validation-error-msg] is present.

options.onFormValidate

This callback is called whenever an input is validated.

input[data-validation]

If this attribute is present validation is activated on the input. You can either set an empty value or a value that corresponds with the regexes and errors option on the validator.

input[data-validation-regex]

The regex that checks validation of the input. Use options.regexes for global settings.

input[data-validation-error-msg]

The error message shown in the div[data-error]. Use options.errors for global settings.

HTML:

<form action="">
  <div class="form-group">
    <label>Required:</label>
    <input
      type="text"
      data-validation
      required>
    <div data-error></div>
  </div>
  <div class="form-group">
    <label>Required Email Address:</label>
    <input
      type="text"
      data-validation="email"
      required>
    <div data-error></div>
  </div>
  <div class="form-group">
    <label>Required Phone Number:</label>
    <input
      type="text"
      data-validation="regex"
      data-validation-error-msg="Not valid"
      data-validation-regex="^([0-9,\+]+)$">
    <div data-error></div>
  </div>
  <button>Submit</button>
</form>

Javascript:

import Validator from '../src'

const validator = new Validator({
  errors: {}, // List of error messages that correspond with data-validation
  regexes: {}, // List of regexes that correspond with data-validation
  onFormValidate: (isFormValid, form) => {
    form.querySelector('button').disabled = !isFormValid
  } // Callback that is called whenever a field is validated
})
validator.initAll()