Title: Need help with editing some code with functions.php
Last modified: December 10, 2021

---

# Need help with editing some code with functions.php

 *  [jazzu](https://wordpress.org/support/users/jazzu/)
 * (@jazzu)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/need-help-with-editing-some-code-with-functions-php/)
 * Hello!
 * I already have the code for a checkbox that I wanted on my checkout page. However,
   I don’t like the way it looks and functions. I really need it to look and act
   exactly the same as WooCommerce’s delivery checkbox works (instead of delivery
   I need it to say Assembly, and on the right side I just need No assembly and 
   Assembly 170€ options.
    The way it works now is that you need to click the Assembly
   checkbox to display it the way I need it.
 * [THIS](https://ibb.co/m6Fzcd5) is what it looks like when it’s not checked (Montaža).
 * [THIS](https://ibb.co/QMhvmhm) is what it looks like when it’s checked – I just
   want to disable the first checkbox, so it looks the way it it when it’s checked.
 * [THIS](https://imgbb.com/KsB9Jhc) is what I’m looking for.
 * This is the code I added to functions.php:
 *     ```
           // Display the custom checkbow field in checkout
       add_action( 'woocommerce_review_order_before_order_total', 'fee_installment_checkbox_field', 20 );
       function fee_installment_checkbox_field(){
           echo '<tr class="packing-select"><th>';
   
           woocommerce_form_field( 'installment_fee', array(
               'type'          => 'checkbox',
               'class'         => array('installment-fee form-row-wide'),
               'label'         => __('Montaža v 14 dneh'),
               'placeholder'   => __(''),
           ), WC()->session->get('installment_fee') ? '1' : '' );
   
           echo '</th><td>';
       }
   
       // jQuery - Ajax script
       add_action( 'wp_footer', 'checkout_fee_script' );
       function checkout_fee_script() {
           // Only on Checkout
           if( is_checkout() && ! is_wc_endpoint_url() ) :
   
           if( WC()->session->__isset('installment_fee') )
               WC()->session->__unset('installment_fee')
           ?>
           <script type="text/javascript">
           jQuery( function($){
               if (typeof wc_checkout_params === 'undefined')
                   return false;
   
               $('form.checkout').on('change', 'input[name=installment_fee]', function(){
                   var fee = $(this).prop('checked') === true ? '1' : '';
   
                   $.ajax({
                       type: 'POST',
                       url: wc_checkout_params.ajax_url,
                       data: {
                           'action': 'installment_fee',
                           'installment_fee': fee,
                       },
                       success: function (result) {
                           $('body').trigger('update_checkout');
                       },
                   });
               });
           });
           </script>
           <?php
           endif;
       }
   
       // Get Ajax request and saving to WC session
       add_action( 'wp_ajax_installment_fee', 'get_installment_fee' );
       add_action( 'wp_ajax_nopriv_installment_fee', 'get_installment_fee' );
       function get_installment_fee() {
           if ( isset($_POST['installment_fee']) ) {
               WC()->session->set('installment_fee', ($_POST['installment_fee'] ? true : false) );
           }
           die();
       }
   
       // Add a custom calculated fee conditionally
       add_action( 'woocommerce_cart_calculate_fees', 'set_installment_fee' );
       function set_installment_fee( $cart ){
           if ( is_admin() && ! defined('DOING_AJAX') || ! is_checkout() )
               return;
   
           if ( did_action('woocommerce_cart_calculate_fees') >= 2 )
               return;
   
           if ( 1 == WC()->session->get('installment_fee') ) {
               $items_count = WC()->cart->get_cart_contents_count();
               $fee_label   = sprintf( __( "Montaža" ), '&times;', $items_count );
               $fee_amount  = 170 * $items_count;
               WC()->cart->add_fee( $fee_label, $fee_amount );
           }
       }
   
       add_filter( 'woocommerce_form_field' , 'remove_optional_txt_from_installment_checkbox', 10, 4 );
       function remove_optional_txt_from_installment_checkbox( $field, $key, $args, $value ) {
           // Only on checkout page for Order notes field
           if( 'installment_fee' === $key && is_checkout() ) {
               $optional = '&nbsp;<span class="optional">(' . esc_html__( 'optional', 'woocommerce' ) . ')</span>';
               $field = str_replace( $optional, '', $field );
           }
           return $field;
       }
       ```
   
 * I really need this to work, so PLEASE help me out here as it’s one of the last
   things I need on this website.
 * Kind regards
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fneed-help-with-editing-some-code-with-functions-php%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Moderator [t-p](https://wordpress.org/support/users/t-p/)
 * (@t-p)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/need-help-with-editing-some-code-with-functions-php/#post-15152103)
 * I recommend asking at [https://wordpress.org/support/plugin/woocommerce/](https://wordpress.org/support/plugin/woocommerce/)
   so its developers and support community can help you with this.
 *  Thread Starter [jazzu](https://wordpress.org/support/users/jazzu/)
 * (@jazzu)
 * [4 years, 5 months ago](https://wordpress.org/support/topic/need-help-with-editing-some-code-with-functions-php/#post-15156877)
 * Hi, [@t-p](https://wordpress.org/support/users/t-p/) !
 * Thank you for your answer. I made a few threads about this on WooCommerce’s forum,
   sadly however, they are not allowed to answer any code-related questions.
 * Kind regards

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Need help with editing some code with functions.php’ is closed to new
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## Tags

 * [code](https://wordpress.org/support/topic-tag/code/)
 * [delivery](https://wordpress.org/support/topic-tag/delivery/)
 * [editing](https://wordpress.org/support/topic-tag/editing/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 2 replies
 * 2 participants
 * Last reply from: [jazzu](https://wordpress.org/support/users/jazzu/)
 * Last activity: [4 years, 5 months ago](https://wordpress.org/support/topic/need-help-with-editing-some-code-with-functions-php/#post-15156877)
 * Status: not resolved

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