Here as we already know that WordPress Plugin Contact Form 7 is very popular for WordPress forms. So, sometimes we also need Contact Form 7 custom Validation for some fields like Full Name, Email Address, Phone Number, etc. In WordPress, Contact Form 7 Validation is very easy as I have given below:

Contact Form 7 provides several kinds of user-input validation by default, including:

• Is a required field filled in?
• Does an email field have an email address in the correct format?
• Is an uploaded file in an acceptable file type and size?

But You can also add your own custom validation.

Contact Form 7 have 2 ways of Validations:

1. WordPress Filters( Validation as a filter ):

You can use WordPress filters for Contact Form 7. Form adding a filter, you need to custom validation function/filter in function.php file.

In Contact Form 7, a user-input validation is implemented as a filter function. The filter hook used for the validation varies depending on the type of form-tag and is determined as: wpcf7_validate_ + {type of the form-tag}. So, for text form-tags, the filter hook is used. Likewise, wpcf7_validate_email* is used for email* form-tags.

Let’s say you have the following email fields in a form:

Email: [email* your-email]
Name: [text* your-name]
Job Tititle: [text* your-job]

The following listing shows code that verifies whether the two fields have identical values.

//Name Validaiton for Job Titile or Full Name
add_filter( 'wpcf7_validate_text*', 'custom_text_validation_filter', 50, 2 );

function custom_text_validation_filter( $result, $tag ) {
if ( 'your-name' == $tag->name ) {
$your_name = isset( $_POST['your-name'] ) ? trim( $_POST['your-name'] ) : '';

if (preg_match('/[0-9]/', $your_name)) {
$result->invalidate( $tag, "The field contains numeric." );

}
}

if ( 'your-job' == $tag->name ) {
$your_job = isset( $_POST['your-job'] ) ? trim( $_POST['your-job'] ) : '';

if (preg_match('/[0-9]/', $your_job)) {
$result->invalidate( $tag, "The field contains numeric." );

}
}

return $result;
}

//Email Validation already exits or not
add_filter( 'wpcf7_validate_email*', 'custom_email_validation_filter', 50, 2 );

function custom_email_validation_filter( $result, $tag ) {
if ( 'your-email' == $tag->name ) {
$your_email = isset( $_POST['your-email'] ) ? trim( $_POST['your-email'] ) : '';

global $wpdb; 

$cf7table = $wpdb->prefix.'db7_forms';

$db = $wpdb->get_results ( "SELECT * FROM $cf7table WHERE `form_value` LIKE '%".$your_email."%' "); 
//echo $wpdb->num_rows;
//print_r($db);
if ( $wpdb->num_rows > 0) {
$result->invalidate( $tag, "The email is already exist." );
}
}

return $result;
}

2. Jquery Validation Plugin For Contact Form 7

This plugin adds jquery form validation to your contact form 7. You will be able to validate extra validation rules like URL, date, credit card, phone number in the contact form 7 fields.

Benefits you get from these plugins.

• Adds Jquery Validation to Contact Form Fields.
• Faster validation than of contact form core validation.
• Allows the field to be validated for URL, date, credit card, number, and more.
• Field Highlight features for invalid field data types.
• Error message for individual fields.
• Easy to add validation rules. Just add the class in contact form 7 fields.
• Interactive validation that your users love.
• Works with multiple forms now.

Validation Methods are available in the lite version.

• Required
• Email
• Url
• Date
• Number
• Digit only
• Credit Card
• US Phone number
• Letters Only
• IBAN (International Bank account number)

Download Jquery Validation Plugin

Additional Validation Methods are available in the PRO version.

• Multiple Custom Code Validation with One time Code option.
• Custom RegEx Validation – Define any validation rules you need.
• Username validation check (Demo : https://bit.ly/2BueOn2).
• Email Code Verification (Demo: https://bit.ly/3gOJuiS).
• Alpha Numeric – Letters, numbers, and underscores only
• Bank or Giro account number.
• BIC Code – Accepts Valid BIC Code Only.
• Giro Account – Accepts Giro Account number only.
• Integer – Accepts positive or negative non-decimal number.
• IPv4 / IPv6 – Accepts IPv4/IPv6 IP address only.
• Mobile UK – Accepts UK Mobile number only.
• Phone UK – Accepts UK phone number only.
• US State – Accepts US state only.
• Minimum Number – Makes the element require a given minimum.
• Maximum Number – Makes the element require a given maximum.
• Minimum Length – Makes the element require a given minimum length.
• Maximum Length – Makes the element require a given maximum length.
• Range Length – Makes the element require a given value range.
• Range – Makes the element require a given value range.
• Equal To – Requires the element to be the same as another one
• Extension – Makes the element require a certain file extension
• Require Group – Ensures a given number of fields in a group are complete.

Summary for Custom Validation in Contact Form 7 in WordPress.

Basically, the First Method ( WordPress Filters) is a Free and better way to add custom or extra validation in Contact Form 7. Because WordPress Filters gives you free hand for any kind of validation in form and it’s free to use. But the Plugin has limited features in the free version. So for full features, you need to buy the PRO version.

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