jQuery Form Validator

With this feature rich jQuery plugin it becomes easy to validate user input while keeping your HTML markup clean from javascript code. Even though this plugin has a wide range of validation functions it's designed to require as little bandwidth as possible. This is achieved by grouping together validation functions in "modules", making it possible for the programmer to load only those functions that's needed to validate a particular form.

Form demos and full documentation available at http://formvalidator.net/

Usage example

<form action="" method="POST">
  <p>
    Name (4 characters minimum):
    <input name="user" data-validation="length" data-validation-length="min4" />
  </p>
  <p>
    Birthdate (yyyy-mm-dd):
    <input name="birth" data-validation="birthdate" />
  </p>
  <p>
    Website:
    <input name="website" data-validation="url" />
  </p>
  <p>
    <input type="submit" />
  </p>
</form>
<script src="js/jquery.min.js"></script>
<script src="js/form-validator/jquery.form-validator.min.js"></script>
<script>
/* important to locate this script AFTER the closing form element, so form object is loaded in DOM before setup is called */
    $.validate({
        modules : 'date, security'
    });
</script>

Support for HTML5

As of version 2.2 (unreleased) you can use this plugin as a fallback solution for the validation attributes in the HTML5 spec. Add the module html5 to the module declaration and you can use the following native features:

Attributes: require, pattern, maxlength, min, max, placeholder

Input types: url, date, time, email, number

Elements: Use the element datalist to create input suggestions

Default validators and features (no module needed)

• url
• email
• domain — domain.com
• number — float/negative/positive/range/step
• date — yyyy-mm-dd (format can be customized, more information below)
• alphanumeric — with support for defining additional characters
• length — min/max/range
• required — no validation except that a value has to be given
• custom — Validate value against regexp
• checkboxgroup — ensure at least 1 checkbox in group has been selected
• Show help information automatically when input is focused
• Validate given values immediately when input looses focus.
• Make validation optional by adding attribute data-validation-optional="true" to the element. This means that the validation defined in data-validation only will take place in case a value is given.
• Make validation dependent on another input of type checkbox being checked by adding attribute data-validation-if-checked="name of checkbox input"
• Create input suggestions with ease, no jquery-ui needed
• to apply multiple validators to an input element, separate the validator names using a space (ex: required email)

Read the documentation for the default features at http://formvalidator.net/#default-validators

Module: security

• spamcheck
• confirmation
• creditcard
• CVV
• strength — Validate the strength of a password
• server — Validate value of input on server side
• letternumeric — Validate that the input value consists out of only letters and/or numbers

Read the documentation for the security module at http://formvalidator.net/#security-validators

Module: date

• time — hh:mm
• birthdate — yyyy-mm-dd, not allowing dates in the future or dates that's older than 122 years (format can be customized, more information below)

Read the documentation for the date module at http://formvalidator.net/#date-validators

Module: location

• country
• federatestate
• longlat
• Suggest countries (english only)
• Suggest states in the US

Read the documentation for the location module at http://formvalidator.net/#location-validators

Module: file

• mime
• extension
• size (file size)
• dimension ()

Read the documentation for the file module at http://formvalidator.net/#file-validators

Module: sweden

• swemob — validate that the value is a swedish mobile telephone number
• swesec — validate swedish social security number
• county - validate that the value is an existing county in Sweden
• municipality - validate that the value is an existing municipality in Sweden
• Suggest county
• Suggest municipality

Read the documentation for the Swedish module at http://formvalidator.net/#sweden-validators

Module: uk

• ukvatnumber

Read the documentation for the UK module at http://formvalidator.net/#uk-validators

Writing a custom validator

You can use the function $.formUtils.addValidator() to add your own validation function. Here's an example of a validator that checks if the input contains an even number.

<form action="" method="POST">
    <p>
        <input type="text" data-validation="even" />
    </p>
    ...
</form>
<script src="js/jquery.min.js"></script>
<script src="js/form-validator/jquery.form-validator.min.js"></script>
<script>

    // Add validator
    $.formUtils.addValidator({
        name : 'even',
        validatorFunction : function(value, $el, config, language, $form) {
            return parseInt(value, 10) % 2 === 0;
        },
        errorMessage : 'You have to answer an even number',
        errorMessageKey: 'badEvenNumber'
    });

    // Initiate form validation
    $.validate();

</script>

Required properties passed into $.formUtils.addValidator

name - The name of the validator, which is used in the validation attribute of the input element.

validatorFunction - Callback function that validates the input. Should return a boolean telling if the value is considered valid or not.

errorMessageKey - Name of language property that is used in case the value of the input is invalid.

errorMessage - An alternative error message that is used if errorMessageKey is left with an empty value or isn't defined in the language object. Note that you also can use inline error messages in your form.

The validation function takes these five arguments:

• value — the value of the input thats being validated
• $el — jQuery object referring to the input element being validated
• config — Object containing the configuration of this form validation
• language — Object with error dialogs
• $form — jQuery object referring to the form element being validated

Creating a custom module

A "module" is basically a javascript file containing one or more calls to $.formUtils.addValidator(). The module file should either have the file extension .js (as an ordinary javascript file) or .dev.js.

Using the file extension .dev.js will tell $.formUtils.loadModules to always append a timestamp to the end of the URL, so that the browser never caches the file. You should of course never use .dev.js on a production website.

Loading your module

<html>
<head>
    <script src="js/form-validator/jquery.form-validator.min.js"></script>
    <script>
        $.formUtils.loadModules('mymodule.dev', 'js/validation-modules/');
    </script>
</head>
</html>
...

The first argument of $.formUtils.loadModules is a comma separated string with names of module files, without file extension (add .dev if the file name is for example mymodule.dev.js, this will insure that the browser never caches the javascript).

The second argument is the path where the module files is located. This argument is optional, if not given the module files has to be located in the same directory as the core modules shipped together with this jquery plugin (js/form-validator/)

Show help information

It is possible to display help information for each input. The information will fade in when input is focused and fade out when input looses focus.

<form action="" id="my_form">
	<p>
	  <strong>Why not:</strong>
	  <textarea name="why" data-validation-help="Please give us some more information" data-validation="required"></textarea>
	</p>
	...

Fully customizable

Read about how to customize this plugin over at http://formvalidator.net/#configuration

Validate On Event

You can cause an element to be validated upon the firing of an event, by attaching an attribute to the form input element named data-validation-event="click". When the configuration settings have validateOnEvent : true, the click event will trigger the onBlur validaton for that element. Possible use case: Checkboxes. Instead of waiting for the checkbox to lose focus (blur) and waiting for a validation to occurr, you can specify that elements validation should occur as soon as that checkbox element is clicked.

Localization

This plugin comes with translations for English, German, French Spanish and Swedish. You can also choose to override the error dialogs yourself. Here you can read more about localization

Program Flow

Form submit() event is bound to jQ func validateForm() when the form is submitted, it calls jQ func $.formUtils.validateInput, which calls validatorFunction for the specific validation rule assigned to the input element. If a validation fails, error messages are assigned and displayed as configured. If validateOnBlur is set to true, jQ finds all form input elements with the data-validation attribute and binds their onBlur event to call the function validateInputOnBlur. it calls jQ func $.formUtils.validateInput to validate the single input when blurred.

Changelog

2.2.43

• Fixed min/max parse error in HTML5 module
• Now also supports Twitter bootstraps horizontal forms
• This plugin now also distributes a default CSS theme including success/fail icons (used on formvalidator.net)
• Email validation now won't fail if email begins with a number
• This plugin now comes with error dialogs translated to English, French, German, Spanish and English.
• New validator letternumeric. Validates that input consists out of any type of letter (not only alphanumeric) and/or numbers
• You can now validate image dimension and ratio
• ... and a bunch of other smaller bug fixes and improvements.

2.2.0

• Now possible to define an error message for each validation rule on a certain input (issue #113)
• This plugin now serves as a html5 fallback. You can now use the native attributes to declare which type of validation that should be applied.
• Use a template for error messages when having errorMessagePosition set to top
• Added validation of credit card number and CVV to the security module
• Event onElementValidate added
• Use the attribute data-validation-confirm to declare which input that should be confirmed when using validation=confirmation (issue #112)
• Validation "required" now supports inputs of type radio
• $.validateForm is now deprecated, use $.isValid instead
• Possible to check if form is valid programmatically without showing error messages
• Select elements can now be validated server-side
• Cleaned up dialog messages
• Various IE8 fixes
• Possible to send along parameters to the server when using server side validation
• Now possible to set your own parameter name when using server side validation
• Improved/simplified URL validation
• ... and a whole lot more small improvements

2.1.47

• Incorrect error-styling when using datepicker or suggestions is now fixed
• Incorrect error-styling of select elements is now fixed
• Deprecated function $.validationSetup is now removed, use $.validate() instead
• You can now return an array with errors using the event onValidate
• You can now declare an element where all error messages should be placed (config.errorMessagePosition)

2.1.36

• Now possible to use the native reset() function to clear error messages and error styling of the input elements

2.1.34

• General improvements and bug fixes
• Added events "beforeValidation" and "validation" (see http://formvalidator.net/#configuration_callbacks for more info)

2.1.27

• E-mail validation support .eu top domain
• Improvements in server validation
• Now possible to re-initiate the validation. This makes it possible to dynamically change the form and then call $.validate() again to refresh the validation (issue #59)
• Number validation now supports range

2.1.15

• E-mail addresses can now contain + symbol
• Correction of the US states in validation "federatestate"
• Fixed bug in server validation

2.1.9

• File validation now support multiple files
• Length validation can now be used to validate the number of uploaded files using a file input that supports multiple files
• Validation classes is no longer applied on inputs that for some reason shouldn't become validated

2.1.8

• Now possible to configure the decimal separator when validating float values. Use either the attribute data-validation-decimal-separator or the property decimalSeparator when calling $.validate()
• $.validationSetup is renamed to $.validate. You will still be able to initiate the validation by calling the $.validationSetup but it's considered deprecated.

2.1.6

• Modules can now be loaded from remote websites

2.1.5

• Fixed language bug (issue #43 on github)
• Validation on server side is now triggered by the blur event
• Now using class names that's compliant with twitter bootstrap 3.x

2.1

• Code refactoring and some functions renamed
• Validator "checkbox_group" added

2.0.7

• Now possible to validate file size, extension and mime type (using the file module)

2.0

• [min|max]_length is removed (now merged with length validation).
• The number, int and float validation is merged together, all three variants is now validated by the number validation.
• Phone validation is moved to "sweden" module and renamed to swephone.
• The attribute to be used when defining the regular expression for custom validations is now moved to its own attribute (data-validation-regexp)
• Length validation now looks at attribute data-validation-length (eg. min5, max200, 3-12).
• The validation rule no longer needs to be prefixed with "validate_" (it's still possible to use the prefix but it's considered deprecated).
• Some validation functions is moved to modules (see the function reference over at http://formvalidator.net).
• Added function $.validationSetup() to reduce the amount of code that has to be written when initiating the form validation.

Credits

Maintainer

Victor Jonsson

Contributors

Steve Wasiura
Thiago Lagden
Joel Sutherland
Matt Clements
Josh Toft
@dfcplc
Andree Wendel
Nicholas Huot
@repkit
Alexandar Blagotic
Yasith Fernando
@S0L4R1S
Erick Lisangan
@kirbs hslee87

Additional credits

Scott Gonzales (URL regexp)
Darren Mason (Password strength meter)
Steve Wasiura (Checkbox group)