core-functionality.php

<?php

/**
 * Load WPForms Customizations
 *
 * @since 1.0.0
 */
function be_wpforms_customizations() {

	// WPForms Pro is required
	if ( !class_exists( 'WPForms_Pro' ) ) {
		return;
	}

	require_once( EA_DIR . '/inc/field-zip-checker.php' );
}
add_action( 'wpforms_loaded', 'be_wpforms_customizations' );

field-zip-checker.php

<?php
/**
 * Zip Code Check field.
 *
 * @package    WPForms
 * @author     WPForms
 * @since      1.0.0
 * @license    GPL-2.0+
 * @copyright  Copyright (c) 2016, WPForms LLC
*/
class BE_Zip_Checker extends WPForms_Field {

	/**
	 * Primary class constructor.
	 *
	 * @since 1.0.0
	 */
	public function init() {

		// Define field type information
		$this->name  = __( 'Zipcode Check', 'ea' );
		$this->type  = 'zip_check';
		$this->icon  = 'fa-hashtag';
		$this->order = 13;
	}

	/**
	 * Field options panel inside the builder.
	 *
	 * @since 1.0.0
	 * @param array $field
	 */
	public function field_options( $field ) {

		//--------------------------------------------------------------------//
		// Basic field options
		//--------------------------------------------------------------------//

		//$this->field_option( 'meta',        $field );
		$this->field_option( 'basic-options', $field, array( 'markup' => 'open' ) );
		$this->field_option( 'placeholder',      $field );
		$this->field_option( 'required',      $field );
		$this->field_option( 'css',              $field );
		$this->field_option( 'basic-options', $field, array( 'markup' => 'close' ) );

	}

	/**
	 * Field preview inside the builder.
	 *
	 * @since 1.0.0
	 * @param array $field
	 */
	public function field_preview( $field ) {

		$placeholder = !empty( $field['placeholder'] ) ? esc_attr( $field['placeholder'] ) : '';

		$this->field_preview_option( 'label', $field );

		printf( '<input type="text" placeholder="%s" class="primary-input" disabled>', $placeholder );

		$this->field_preview_option( 'description', $field );
	}

	/**
	 * Field display on the form front-end.
	 *
	 * @since 1.0.0
	 * @param array $field
	 * @param array $form_data
	 */
	public function field_display( $field, $field_atts, $form_data ) {

		// Setup and sanitize the necessary data
		$field             = apply_filters( 'wpforms_number_field_display', $field, $field_atts, $form_data );
		$field_placeholder = !empty( $field['placeholder']) ? esc_attr( $field['placeholder'] ) : '';
		$field_required    = !empty( $field['required'] ) ? ' required' : '';
		$field_class       = implode( ' ', array_map( 'sanitize_html_class', $field_atts['input_class'] ) );
		$field_id          = implode( ' ', array_map( 'sanitize_html_class', $field_atts['input_id'] ) );
		$field_value       = !empty( $field['default_value'] ) ? esc_attr( apply_filters( 'wpforms_process_smart_tags', $field['default_value'], $form_data ) ) : '';
		$field_data        = '';

		// Add available zips as data
		$zipcodes = explode( PHP_EOL, $form_data['settings']['mtc_zip_codes'] );
		$zipcodes = array_map( 'intval', $zipcodes );
		$field_data .= ' data-zipcodes="' . implode( ',', $zipcodes ) . '"';


		if ( !empty( $field_atts['input_data'] ) ) {
			foreach ( $field_atts['input_data'] as $key => $val ) {
			  $field_data .= ' data-' . $key . '="' . $val . '"';
			}
		}

		$button = '<button class="zip-check">GO</button>';
		$popup  = '<div id="mtc-unavailable-popup" class="mct-popup"><p>We are not currently servicing this zip code. If you have further questions, please call us at 703.299.0101.</p></div>';

		// Primary text field
		printf(
			'<input type="text" name="wpforms[fields][%d]" id="%s" class="%s" value="%s" placeholder="%s" %s %s>%s %s',
			$field['id'],
			$field_id,
			$field_class,
			$field_value,
			$field_placeholder,
			$field_required,
			$field_data,
			$button,
			$popup
		);
	}
}
new BE_Zip_Checker;