jQuery form validation

jQuery form validation is a library that helps you to validate your HTML form, it's completable with both Bootstrap 3 and Bootstrap 4.

Installation

You can follow one of these methods to get the package:

via npm
npm install jquery-form-validation 
direct download
https://raw.githubusercontent.com/bnabriss/jquery-form-validation/master/dist/jquery.form-validation.min.js 
from JSDELIVR
<script src="https://cdn.jsdelivr.net/npm/jquery-form-validation/dist/jquery.form-validation.min.js"></script>

How to use

Simple usage

image

html
<form>     <div class="form-group">         <input class="form-control" data-validator="required|min:4|max:10">     </div> </form>
javascript
$(document).on('blur', '[data-validator]', function () {     new Validator($(this)); });

Add feedback message

Update your HTML to add element with selector .form-control-feedback, this element should belong to the parent .form-group (or your parent selector), you should also set the input label, this label will be visble in the error message, by adding the attribute data-validator-label to input itself.

<form>     <div class="form-group">         <input class="form-control" data-validator-label="First Name" data-validator="required|min:4|max:10">         <div class="form-control-feedback"></div>     </div> </form>

Customize options

You can pass your custom options as a second parameter to the constructor.

$(document).on('blur', '[data-validator]', function () {     new Validator($(this), {/* your options here*/}); });

And here is a table of available options

Tables default description
parentSelector '.form-group' you can set the parent selector for input, this used to set error/success classes and to search in it when search for feedback messages
feedbackSelector '.form-control-feedback' this selector used to specify when the error message should appear when error occurs, this should be inside the specified parent
inputSuccessClass 'is-valid' the class that should be given to the input when the input is valid
inputErrorClass 'is-invalid' the class that should be given to the input when the input is invalid
feedbackSuccessClass 'valid-feedback' the class that should be given to feedback element when the input is valid
feedbackErrorClass 'invalid-feedback' the class that should be given to feedback element when the input is invalid
parentErrorClass 'has-error' the class that should be given to the parent element when the input is invalid
parentWarningClass 'has-warning' the class that should be given to the parent element when the input is invalid when the rule specified as warning rule
parentSuccessClass 'has-success' the class that should be given to the parent element when the input is valid
rules the data-validator value this option will override the data-validator attribute value
validatorNameAttr validator-label specify the label attribute of the input

warning errors

you can specify some rules as warning errors, this completable with bootstrap 3 (or your custom options) since it has has-warning class for the parent .form-group

<form>     <div class="form-group">         <input class="form-control" data-validator="required|min:4|max:10" data-validator-warnings="min">     </div> </form>

Note that you should keep min in data-validator.

Available Validation Rules

Rule example description
required required The field under validation must be present in the input data and not empty
numeric numeric The field under validation must be numeric
integer integer The field under validation must be an integer
between_numeric between_numeric:10,40 The numeric field under validation must be between the given two values
max_numeric max_numeric:60 The numeric field under validation must less than or equal the given value
min_numeric min_numeric:10 The numeric field under validation must greater than or equal the given value
size_numeric size_numeric:10 The numeric field under validation must exactly equal the given value
between between:2,10 The field length must between the two given values
max max:10 The field length must less than or equal the given value
min min:2 The field length must greater than or equal the given value
size size:6 The field length must exactly equal the given value
date date The field must be valid date syntax (new Date())
before before:2015-01-01 The date value must be older than the given value
before_or_equal before_or_equal:2018-12-01 14:00:00 The date value must be older than or equal the given value
after after:2015-01-01 The date value must be newer than the given value
after_or_equal after_or_equal:2018-12-01 14:00:00 The date value must be newer than or equal the given value
email email The field under validation must be formatted as an e-mail address
in in:male,female,... The field under validation must be included in the given list of values
not_in not_in:foo,bar,... The field under validation must not be included any of the given list of values
regex regex:[A-Z0-9]{6} The field under validation must match the given regular expression
different different:old_password The field under validation must have a different value than field with the given field name (attribute)
same same:password The field under validation must exactly the same value of the field with the given field name (attribute)
required_if required_if:old_password The field under validation must have a value if the field with the given name (attribute) is entered
required_if_val required_if_val:password,123456 The field under validation must have a value if the field with the given name (attribute) has exactly the given value
url url The field under validation must be a valid URL

Custom errors

You can bind the Validator object with your custom validator function.

Validator.prototype.valid_user_name = function (customLength) {     if (this.val && customLength /*...*/){         // ...         return true;     }     return false; };

And to use it in your forms

<form>     <div class="form-group">         <input class="form-control" data-validator="valid_user_name:8">     </div> </form>

Existing error messages

The previous listed errors already has it's errors messages (English)

Validator.prototype.language = {     numeric: 'The {label} must be a number.',     integer: 'The {label} must be an integer.',     between_numeric: 'The {label} must be between {param0} and {param1}.',     max_numeric: 'The {label} may not be greater than {param0}.',     min_numeric: 'The {label} must be at least {param0}.',     size_numeric: 'The {label} must be {param0}.',     between: 'The {label} must be between {param0} and {param1} characters.',     max: 'The {label} may not be greater than {param0} characters.',     min: 'The {label} must be at least {param0} characters.',     size: 'The {label} must be {param0} characters.',     date: 'The {label} must be a date after {param0}.',     before: 'The {label} must be a date before {param0}.',     before_or_equal: 'The {label} must be a date before or equal to {param0}.',     after: 'The {label} must be a date after {param0}.',     after_or_equal: 'The {label} must be a date after or equal to {param0}.',     age: 'The age should be more than {param0}.',     email: 'The  {label} must be a valid email address.',     in: 'The selected {label} is invalid.',     not_in: 'The selected {label} is invalid.',     different: 'The {label} and {otherLabel} must be different.',     required: 'The {label} field is required..',     required_if: 'The {label} field is required when {otherLabel} is filled.',     required_if_val: 'The {label} field is required when {otherLabel} is {param0}',     same: 'The {label} and {otherLabel} must match.',     url: 'The {label} format is invalid.',     regex: 'The {label} format is invalid.' }

Bind error message

you can simply override the given messages using prototype object, and note that the key of the message is exactly the same of the function name, so when you add your custom validator you should add the suitable key language if you want to show the error, you can also use the syntax '{label}' in your message to be replaced with your [data-validator-label] that you have added to the input, you can also the syntax {param0} to bind the first parameter in the error your message.

Validator.prototype.language = {/* your custom error messages */}

Or you can merge exiting errors with additional messages using options parameter in the constructor

$(document).on('blur', '[data-validator]', function () {     new Validator($(this), {         language : {             valid_user_name : 'The {label} should have a valid user name with length of {param0}'         }     }); });