CakePHP form file upload validation multiple files

Need Help
1

Hi all,
new to cakePHP, editing an existing application in my company
I have a from with multiple files to upload,
I managed to set up the form with the below link
http://deadlytechnology.com/php/file-uploads-jquery-cakephp/
adding dynamically file inputs
Now I don’t have any idea about how to manage the form validate. I need to validate file mime types ‘doc, docx, xls, xlsx, csv,ppt,pptx’.
Also in the view .ctp file

    $arrValidation = array(
        'Rules' => array(
            'project_name' => array('required' => 1),
            'description' => array('required' => 1),
            'status' => array('required' => 1),
            'project_type' => array('required' => 1),
            'start_dates' => array('required' => 1),
            'end_dates' => array('required' => 1),
        ),
        'Messages' => array(
            'project_name' => array('required' => __('Please Enter Project Name')),
            'description' => array('required' => __('Please Enter Description')),
            'status' => array('required' => __('Please Select Status')),
            'project_type' => array('required' => __('Please Select A Project Type')),
            'start_dates' => array('required' => __('Please Select A Project Start Date')),
            'end_dates' => array('required' => __('Please Enter Project End Date'))));

     echo $this->Form->setValidation($arrValidation);

how to add the JS validation file the above snippet.

I have added validate function

public $validate = array(

    'PluginFile[]' => array(
        'extension' => array(
            'rule' => array('extension', array('pdf')),
            'message' => 'Only pdf files',
         )
    )
);

but it not working validation.
Please help me to add both front end and back end validation
pardon for my english
Thanks in advance

2

If you are using cake 2, For validation you can add inside the Controller

f(extension != ‘.pdf’) {
$this->Model->invalidate(‘extension’, ‘Invalid file format’);
}

then you can get the error message by

$errorMessage = $this->Model->validationErrors;