Making the coupon field mandatory on WooCommerce

3 comments

1. I don’t know about the function but you can modify the plugin to achieve this in following manner :

   Make one folder in your theme folder woocommerce and in new created woocommerce folder, create another folder with checkout name.

   So now it will look something like wp-content > themes > your-theme > woocommerce > checkout.

   Now go to your plugin directory and follow below path :

   wp-content > plugins > woocommerce > templates > checkout

   When you go in above path, you will find one file named as form-coupon.php. Copy that file and paste it to the directory which we created at top of that answer.

   wp-content > themes > your-theme > woocommerce > checkout > form-coupon.php.

   Now its time to modify the code in wp-content > themes > your-theme > woocommerce > checkout > form-coupon.php :

   Find following code line in above mentioned file :

   <input type="text" name="coupon_code" class="input-text" placeholder="<?php _e( 'Coupon code', 'woocommerce' ); ?>" id="coupon_code" value="" />
   

   And replace above line with

   <input type="text" name="coupon_code" class="input-text" placeholder="<?php _e( 'Coupon code', 'woocommerce' ); ?>" id="coupon_code" value="" required/>
   

   Note: Here I have added required attribute of html.

   Tell me if you have any doubt.

   UPDATED:

       add_action('woocommerce_check_cart_items', 'make_coupon_code');
   
       function make_coupon_code()
       {
           global $woocommerce;
           if(is_cart() || is_checkout()){
               $my_coupon = $woocommerce->cart->applied_coupons;
               echo $woocommerce->cart->get_applied_coupons;
               if(empty($my_coupon))
               {
                   $woocommerce->add_error("Please enter coupon code to checkout.");
               }
           }
       }
   

   Please give it a try and let me know feedback.

   NOTE: UNTESTED

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2. to solve the problem try this code:

       <?php
    add_action('woocommerce_check_cart_items', 'make_coupon_code');
   
       function make_coupon_code()
       {
           global $woocommerce;
           if(is_cart() || is_checkout()){
               $my_coupon = $woocommerce->cart->applied_coupons;
               echo $woocommerce->cart->get_applied_coupons;
               if(empty($my_coupon))
               {
                   wc_add_notice( '<strong>' . $btn['label'] . '</strong> ' . __( 'insert coupon code', 'woocommerce' ), 'error' );
               }
           }
       }
   ?>
   

   in functions.php instead of the one above…

   for me it works

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3. Add the following code in functions.php

   Require Coupon for Single Product

   add_action( 'woocommerce_check_cart_items', 'mandatory_coupon_for_specific_items' );
   function mandatory_coupon_for_specific_items() {
     $targeted_ids = array(37); // The targeted product ids (in this array)
     $coupon_code = 'summer2'; // The required coupon code
     $coupon_applied = in_array( strtolower($coupon_code), WC()->cart->get_applied_coupons() );
   
     // Loop through cart items
     foreach(WC()->cart->get_cart() as $cart_item ) {
       // Check cart item for defined product Ids and applied coupon
       if( in_array( $cart_item['product_id'], $targeted_ids ) && ! $coupon_applied ) {
         wc_clear_notices(); // Clear all other notices
         // Avoid checkout displaying an error notice
         wc_add_notice( sprintf( 'The product"%s" requires a coupon for checkout.', 
         $cart_item['data']->get_name() ), 'error' );
         break; // stop the loop
       }
     }
   }
   

   Replace 37 by the your product ID in $targeted_ids = array(37); you can have multiple product IDs like $targeted_ids = array(37,48,12);

   Replace “summer2” by any other coupon code in $coupon_code = 'summer2';
   Don’t forget to add this coupon code in WooCommerce before using it.

   ---

   Require coupon for all products

   add_action( 'woocommerce_check_cart_items', 'mandatory_coupon_code' );
   function mandatory_coupon_code() {
     $product_categories = array( 'clothing' ); // Category ID or slug of targeted category
     $coupon_code = 'summer2'; // The required coupon code
     $coupon_applied = in_array( strtolower($coupon_code), WC()->cart->get_applied_coupons() );
     // Loop through cart items
     foreach ( WC()->cart->get_cart() as $cart_item ){
       if( has_term( $product_categories, 'product_cat', $cart_item['product_id'] ) && !$coupon_applied ) {
         wc_clear_notices(); // Clear all other notices
         // Avoid checkout displaying an error notice
         wc_add_notice( sprintf( 'The product"%s" requires a coupon for checkout.', 
         $cart_item['data']->get_name() ), 'error' );
         break; // stop the loop
       }
     }
   }
   

   Replace $product_categories = array( 'clothing' ); by any other category name or category ID.

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