A PHP model validator compatible with the jQuery Validation plugin that allows for shared validation rules (in JSON) between JavaScript and PHP.
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README.md

Pajama

Pajama provides drop-in server-side validation for your existing jQuery Validation plugin forms. It can also be used for standalone server-side validation in a pinch.

Since the goal of Pajama was to be used with the jQuery Validation plugin, the API has been designed to be similar and thus familiar to developers who already know how to use the jQuery Validation plugin.

For more information on using the Pajama API, please refer to the documentation.

For documentation on the validation methods (like required, min, max, etc.) refer to the jQuery Validation plugin documentation.

Pajama is now Composer-compatible and available on Packagist. Simply add this line to your composer.json to use it:

{
    "require": {
        ...
        "cdmckay/pajama": "dev-master"
    }
}

Getting Started (jQuery Validation integration)

First, get jQuery and the jQuery Validation plugin.

Next, create a rules.json file:

{
    "rating":{
        "required":true,
        "range":[1, 100]
    }
}

Now, include jQuery and the jQuery Validation plugin on a page:

<html>
    <head>
        <title>Getting Started</title>
        <script type="text/javascript" src="jquery.js"></script>
        <script type="text/javascript" src="jquery.validate.js"></script>
    </head>
    <body>
        <form method="post" action="form-handler.php">
            <label>Rating: <input type="text" name="rating" /></label>
        </form>
        <script type="text/javascript">
        $.getJSON("rules.json", function(rules) {
            $("form").validate({ rules: rules });
        });
        </script>
    </body>
</html>

Finally, create a PHP script to handle the form submission:

require 'ValidatorContext.php';
require 'Validator.php';

\Cdmckay\Pajama\Validator::validate(array(
    'model' => $_POST,
    'rules' => json_decode('rules.json', true),
    'validHandler' => function() {
        // Store rating in database.
    },
));

For a more detailed example, see the jquery-validation-integration example in the examples folder.

Getting Started (standalone)

Although not its primary design goal, Pajama can be used standalone. Simply include the vendor/autoload.php file (generated by Composer) in your PHP script and pass it a model and some rules, like so:

$rules = array(
    'first_name' => 'required',
    'last_name' => 'required',
    'password_1' => array(
        'required' => true,
        'minlength' => 5,
        'equalTo' => '#password_2',
    ),
    'password_2' => array(
        'required' => true,
        'minlength' => 5,
        'equalTo' => '#password_1',
    ),
);

// Validate with callbacks...
$validator = \Cdmckay\Pajama\Validator::validate(array(
    'model' => $_POST,
    'rules' => $rules,
    'validHandler' => function() {
        // Model validated.
    },
    'invalidHandler' => function() {
        // Model failed validation.
    },
));

// ...or methods.
if($validator->model()) {
    // Model validated.
} else {
    // Model failed validation.
}

See the standalone example in the examples folder.

Custom Validators

Like the jQuery Validation plugin, Pajama can be extended via custom validators. To create a custom validator, use the addMethod static method like so:

\Cdmckay\Pajama\Validator::addMethod('regex', function($context, $value, $param)) {
    return $context->optional($value) || preg_match('/' . $param . '/', $value);
});

\Cdmckay\Pajama\Validator::validate(array(
    'model' => $_POST,
    'rules' => array(
        'md5_hash' => array(
            'required' => true,
            'regex' => '^[A-Fa-f0-9]+$',
        ),
    ),
    'validHandler' => function() {
        // ...
    },
));

Remember that if you're using Pajama with the jQuery Validation plugin, you must also write a JavaScript version of the validation method:

$.validator.addMethod("regex", function(value, element, param) {
    return this.optional(element) || new RegExp(param).test(value);
}, "This field does not conform to a pattern.");

Limitations

Since Pajama has no access to the submitting form's DOM context, it only has limited support for CSS selectors.

For example, consider this mark-up:

<form>
    <div class="checkbox-group">
        <label><input type="checkbox" name="foo[0]" value="bar" />Bar</label>
        <label><input type="checkbox" name="foo[1]" value="baz" />Baz</label>
    </div>
</form>

The jQuery Validation plugin required validation method can support arbitrary jQuery selectors like this:

{
    "email": {
        "required":".checkbox-group :checkbox:first:checked"
        "email":true
    }
}

However, the best Pajama can do is this:

{
    "email": {
        "required":"[name=foo[0]]:checked"
        "email":true
    }
}

In general, Pajama can only recognize selectors with the form #foo or [name=foo] and the following pseudo-classes:

  • :checked
  • :unchecked
  • :filled
  • :blank

In the case of #foo, Pajama assumes that the name and the id of the element were the same, as in:

<input type="text" name="foo" id="foo" />