How to check if form shipping address in checkout is valid

Question

When I do in checkout, I got an error : I would like to detect if the person has filled in the registration form in the checkout, this code is added in this file : app/design/frontend/Theme/theme/Amasty_CheckoutCore/templates/onepage.phtml

define(['jquery','mage/translate', 'mage/validation'], function($){
    "use strict";
    return {
        customMain: function (){

            console.log($('.form-shipping-address').validation('isValid'))


        }
    }
});

error :

Uncaught Error: cannot call methods on validation prior to initialization; attempted to call method 'isValid'

Answer 1

Place your code inside require and load mage/validation

require([
'jquery',
'mage/validation'
], function($){
   
   // Place your other code here

   console.log($('.form-shipping-address').validation('isValid'))

 
});

Answer 2

You have to run validation() function before use isValid.

Use this code to validate the shipping form:

var shippingForm = $('#co-shipping-form');
if (shippingForm.validation() && shippingForm.validation('isValid')) {
    console.log('valid');
} else {
    console.log('invalid');
}