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I would like to inherit  a javascript method to update some information on website page. I have tried all the ways I could but didn't work any. Most suprisingly I can't even access the object (probably itsn't considered object). If not considered object then what's the way to inherit such functions? link to the method

var delivery = require('website_sale_delivery.checkout'); // gives undefined why so? 
I am sure its not dependency issue. 
Dependencies are okay and nothing wrong on console
'use strict';
odoo.define('website_sale_delivery.checkout', function (require) {

require('web.dom_ready');
var ajax = require('web.ajax');

/* Handle interactive carrier choice + cart update */
var $pay_button = $('#o_payment_form_pay');

var _onCarrierUpdateAnswer = function(result) {
var $amount_delivery = $('#order_delivery span.oe_currency_value');
var $amount_untaxed = $('#order_total_untaxed span.oe_currency_value');
var $amount_tax = $('#order_total_taxes span.oe_currency_value');
var $amount_total = $('#order_total span.oe_currency_value');
var $carrier_badge = $('#delivery_carrier input[name="delivery_type"][value=' + result.carrier_id + '] ~ .badge.hidden');
var $compute_badge = $('#delivery_carrier input[name="delivery_type"][value=' + result.carrier_id + '] ~ .o_delivery_compute');
if (result.status === true) {
$amount_delivery.text(result.new_amount_delivery);
console.log("deliverystandard...........",$amount_delivery);
$amount_untaxed.text(result.new_amount_untaxed);
$amount_tax.text(result.new_amount_tax);
$amount_total.text(result.new_amount_total);
$carrier_badge.children('span').text(result.new_amount_delivery);
$carrier_badge.removeClass('hidden');
$compute_badge.addClass('hidden');
$pay_button.prop('disabled', false);
}
else {
console.error(result.error_message);
$compute_badge.text(result.error_message);
}
};
});
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Best Answer
var _onCarrierUpdateAnswer = function(result) {
    var $amount_delivery = $('#order_delivery span.oe_currency_value');
    var $amount_untaxed = $('#order_total_untaxed span.oe_currency_value');
    var $amount_tax = $('#order_total_taxes span.oe_currency_value');
    var $amount_total = $('#order_total span.oe_currency_value');
    var $carrier_badge = $('#delivery_carrier input[name="delivery_type"][value=' + result.carrier_id + '] ~ .badge.hidden');
    var $compute_badge = $('#delivery_carrier input[name="delivery_type"][value=' + result.carrier_id + '] ~ .o_delivery_compute');
    if (result.status === true) {
        $amount_delivery.text(result.new_amount_delivery);
        $amount_untaxed.text(result.new_amount_untaxed);
        $amount_tax.text(result.new_amount_tax);
        $amount_total.text(result.new_amount_total);
        $carrier_badge.children('span').text(result.new_amount_delivery);
        $carrier_badge.removeClass('hidden');
        $compute_badge.addClass('hidden');
        // your custom code
        $pay_button.prop('disabled', true);
    }
    else {
        console.error(result.error_message);
        $compute_badge.text(result.error_message);
    }
};

var _onCarrierClick = function(ev) {
    $pay_button.prop('disabled', true);
    var carrier_id = $(ev.currentTarget).val();
    var values = {'carrier_id': carrier_id};
    ajax.jsonRpc('/shop/update_carrier', 'call', values)
      .then(_onCarrierUpdateAnswer);
};

var $carriers = $("#delivery_carrier input[name='delivery_type']");
$carriers.off('click');
$carriers.click(_onCarrierClick);
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We can't directly inherit _onCarrierUpdateAnswer method. We have to bind click even using our custom code and disconnect the current code.

Here the $carriers.off('click'); will disconnect the original base code and $carriers.click(_onCarrierClick); will help us to bind the click event handler and run our custom code with the modification.

Hope this will help you.