magento 2 Show a confirmation pop up in check out page while submitting the form

Question

can you please help me how to Show a confirmation pop up in check out page while submitting the form in magento2.

Answer 1

Copy file from

vendor/magento/module-checkout/view/frontend/web/js/view/payment/default.js

to

app/design/frontend/vendor/theme/Magento_Checkout/web/js/view/payment/default.js

find placeOrder: function (data, event) and edit this function as given below

if(confirm("Are you sure to place order?") == true){
   //default function code
}else{
   return false;
}

e.g.

placeOrder: function (data, event) {

            if(confirm("Are you sure to place order?") == true){
                var self = this;

                if (event) {
                    event.preventDefault();
                }

                if (this.validate() && additionalValidators.validate()) {
                    this.isPlaceOrderActionAllowed(false);

                    this.getPlaceOrderDeferredObject()
                        .fail(
                            function () {
                                self.isPlaceOrderActionAllowed(true);
                            }
                        ).done(
                            function () {
                                self.afterPlaceOrder();

                                if (self.redirectAfterPlaceOrder) {
                                    redirectOnSuccessAction.execute();
                                }
                            }
                        );

                    return true;
                }

                return false;
            }else{
                return false;
            }
        },

Now run php bin/magento setup:static-content:deploy command.