optional_zip_countries.phtml

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<?php
// @codingStandardsIgnoreFile
?>
<script>
require([
    "prototype",
    "mage/adminhtml/events"
], function(){

//<![CDATA[
optionalZipCountries = <?= /* @noEscape */ $this->helper('Magento\Directory\Helper\Data')->getCountriesWithOptionalZip(true) ?>;

function onAddressCountryChanged (countryElement) {
    var zipElementId = countryElement.id.replace(/country_id/, 'postcode');

    // Ajax-request and normal content load compatibility
    if ($(zipElementId) != undefined) {
        setPostcodeOptional($(zipElementId), countryElement.value);
    } else {
        Event.observe(window, "load", function () {
            setPostcodeOptional($(zipElementId), countryElement.value);
        });
    }
}

function setPostcodeOptional(zipElement, country) {
    if (optionalZipCountries.indexOf(country) != -1) {
        while (zipElement.hasClassName('required-entry')) {
            zipElement.removeClassName('required-entry');
        }
        zipElement.up('div.field').removeClassName('required');
        zipElement.up('div.field').removeClassName('_required');
    } else {
        zipElement.addClassName('required-entry');
        zipElement.up('div.field').addClassName('required');
        zipElement.up('div.field').addClassName('_required');
    }
}

varienGlobalEvents.attachEventHandler("address_country_changed", onAddressCountryChanged);

window.setPostcodeOptional = setPostcodeOptional;
window.onAddressCountryChanged = onAddressCountryChanged;
window.optionalZipCountries = optionalZipCountries;
//]]>

});
</script>