On the checkout page in Magento 2
After search data by finder code, it auto fill customers data.
But when I click the "Next" button. It will show "This is a required field."
In this post https://stackoverflow.com/questions/13632599/knockout-valueupdate-on-change-from-javascript-code
var elem = document.getElementById("input");
elem.value = "new value";
ko.utils.triggerEvent(elem, "change");
For example my code
jQuery('input[name="firstname"]').val("Cara");
I want to know about "ko.utils.triggerEvent"
by jQuery not element