validate coupon generate fiend onchange element issue 23778

Author: edenduong

app/code/Magento/SalesRule/Block/Adminhtml/Promo/Quote/Edit/Tab/Coupons/Form.php

@@ -77,7 +77,8 @@ protected function _prepareForm()
                 'label' => __('Coupon Qty'),
                 'title' => __('Coupon Qty'),
                 'required' => true,
-                'class' => 'validate-digits validate-greater-than-zero'
+                'class' => 'validate-digits validate-greater-than-zero',
+                'onchange' => 'window.validateCouponGenerate(this)'
             ]
         );
 
@@ -91,7 +92,8 @@ protected function _prepareForm()
                 'required' => true,
                 'note' => __('Excluding prefix, suffix and separators.'),
                 'value' => $couponHelper->getDefaultLength(),
-                'class' => 'validate-digits validate-greater-than-zero'
+                'class' => 'validate-digits validate-greater-than-zero',
+                'onchange' => 'window.validateCouponGenerate(this)'
             ]
         );
 
@@ -103,7 +105,8 @@ protected function _prepareForm()
                 'name' => 'format',
                 'options' => $couponHelper->getFormatsList(),
                 'required' => true,
-                'value' => $couponHelper->getDefaultFormat()
+                'value' => $couponHelper->getDefaultFormat(),
+                'onchange' => 'window.validateCouponGenerate(this)'
             ]
         );
 
@@ -138,7 +141,8 @@ protected function _prepareForm()
                 'title' => __('Dash Every X Characters'),
                 'note' => __('If empty no separation.'),
                 'value' => $couponHelper->getDefaultDashInterval(),
-                'class' => 'validate-digits'
+                'class' => 'validate-digits',
+                'onchange' => 'window.validateCouponGenerate(this)'
             ]
         );
 

app/code/Magento/SalesRule/view/adminhtml/templates/promo/salesrulejs.phtml

@@ -86,6 +86,11 @@ function generateCouponCodes(idPrefix, generateUrl, grid) {
     });
 }
 
+function validateCouponGenerate(elm) {
+    jQuery.validator.validateSingleElement(elm);
+}
+
+window.validateCouponGenerate = validateCouponGenerate;
 window.generateCouponCodes = generateCouponCodes;
 window.refreshCouponCodesGrid = refreshCouponCodesGrid;
 });