multi step checkout - Javascript changes reset when page reloads

[kiasati]

I have a one page checkout for my site, so i decided to separate it to 4 or 5 parts, and make one or two display at a time, using javascript.

see the code below:

Code Select Expand

    <fieldset id="vm-fieldset-pricelist" class="vm-fieldset-pricelist"> ... </fieldset>

    <div id="coupon-section" class="coupon-section display-none"> ... </div>

    <fieldset id="shipment-section" class="shipment-section display-none"> ... </fieldset>

    <div id="edit-account-section" class="billto-shipto display-none"> ... </div>

    <div id="part-five" class="display-none"> ... </div>


    <?php
                    $user = JFactory::getUser();
                    if ($user->guest) { 
                        $usercheckin = '_notloggedin';
                    } else {
                        $usercheckin = '_loggedin';
                    } 
            ?>

   <button type="button" id="one-to-two<?php echo $usercheckin ?>" class="sabz-button pull-right" onclick="cartButtonHandler(this.id); return false;"><?php echo vmText::_('COM_VIRTUEMART_CHECKOUT_TITLE')?> </button>

<script>

window.cartButtonHandler = function(button_id) {
    switch(button_id) {
    case 'one-to-two_notloggedin':
        document.getElementById("vm-fieldset-pricelist").className = "display-none";
        document.getElementById("com-form-login").className = "";
        document.getElementById(button_id).innerHTML = "ثبت اطلاعات و ادامه خرید";
        document.getElementById(button_id).className = "abi-button pull-right";
        document.getElementById(button_id).id = 'two-to-three';
        break;
    case 'one-to-two_loggedin':
        document.getElementById("vm-fieldset-pricelist").className = "display-none";
        document.getElementById("edit-account-section").className = "billto-shipto display-none";
        document.getElementById("shipment-section").className = "shipment-section";
        document.getElementById(button_id).innerHTML = "ثبت اطلاعات و ادامه خرید";
        document.getElementById(button_id).className = "abi-button pull-right";
        document.getElementById(button_id).id = 'two-to-three';
        break;
    case 'two-to-three':
        document.getElementById("edit-account-section").className = "display-none";
        document.getElementById("shipment-section").className = "display-none";
        document.getElementById("coupon-section").className = "coupon-section";
        document.getElementById(button_id).innerHTML = "بازبینی و تایید سفارش";
        document.getElementById(button_id).id = 'three-to-four';
        break;
   case 'three-to-four':
        document.getElementById("part-chahar").className = "";
        document.getElementById("vm-fieldset-pricelist").className = "vm-fieldset-pricelist";
        document.getElementById("edit-account-section").className = "billto-shipto display-none";
        document.getElementById("shipment-section").className = "shipment-section";
        document.getElementById("coupon-section").className = "coupon-section";
        document.getElementById("handlerbutton-section").className = "display-none";
        document.getElementById(button_id).id = 'four-to-five';
        break;
   case 'four-to-five':
        alert(button_id);
        break;
}
}

    </script>

First of all, I don't know javascript, is there a better way to do this in javascript or jquery or ...?

My problem: when a user for example in "coupon-section" inputs a coupon code and clicks on submit button, mind that coupon submit button is different from NEXT STEP button, the page reloads and first step pops up. or when a user checks a check box, or any other interaction, page reloads and first step pops up.

How can i save javascript changes and get them back on page reload so user can stay on the same step after interacting with the form? i guess it might be solved using cookies or something but i don't know how to do that.

[erica23]

I am having a similar issue:
when my customer adds coupon code and clicks save, it calculates it and shows, but when they scroll down to one page checkout section to fill out their information, it recalculates shipping and resets/deletes the coupon code....
Hoping someone is able to respond to both of us and help us with our issues.
Thanks!