Magento 2: Zip Validation on Checkout Page

Question

I want to add zip validation on my checkout page like right now if somebody put zip code like *6722 the order place I want some validation for special characters.

• Amit Bera: what is format support?
• imtiazau: how i check where i can check this?@Amit Bera

Answer 1

There two files you need to create.

• First,Add additional CSS class to Postcode using plugin https://magento.stackexchange.com/a/205672/4564

  namespace MODULE\NAME\Model\Plugin;
  class AttributeMergerPlugin
  {
   public function afterMerge(\Magento\Checkout\Block\Checkout\AttributeMerger $subject, $result)
   {
   if (array_key_exists('postcode', $result)) {
   $result['postcode']['additionalClasses'] = 'your_css_custom_class';
   }
   return $result;
   }
  }
  

• Second, create a custom validation rule for javascript: Link: https://magento.stackexchange.com/a/192407/4564

file code: Vendor_Module/view/frontend/web/js/validation-mixin.js

define([
 'jquery'
], function ($) {
 "use strict";
 return function () {
 $.validator.addMethod(
 'your_css_custom_class',
 function (value) {
 // Some custom validation stuff here
 return true or false;
 },
 $.mage.__('Your validation error message')
 );
 }
});