在jQuery AJAX成功后刷新一个回显的PHP变量吗？

Question

I have a shopping cart in Codeigniter in which products are added to the cart using (jQuery) Ajax. In the header of each page it displays the number of contents in the cart using

<?php echo $this->cart->total_items(); ?>

How can I update/refresh this variable when a product is added to the cart, as I am using AJAX to add products to the cart and thus the page isn't being reloaded when products are added. It seems pointless to use AJAX to do asyncronous stuff if I have to reload the page to get the new number of total items from the server.

Many thanks.

Answer 1

You should be able to do this by making the element containing the Shopping Card Item Count easily addressable by JavaScript, so:

<span id="total_items"><?php echo $this->cart->total_items(); ?></span>

Then, as part of the AJAX Function you perform, have the response contain the revised value for the total items, and then have your function replace the content of this span with that value.

Answer 2

As I understood you, you need something to dynamically update your number of articles ?

You can use jQuery PeriodicalUpdater to update that number "every once in a while" ( point it to a script that returns the current number only, ofc ).

Answer 3

Don't think about PHP in this case — it's totally irrelevant. What you need to do is modify content of that element client-side. So if you have:

<div id="total_items"><?php /* ... */ ?></div>

Then in your AJAX success handler you should do something like:

$('#total_items').html('new item count');

Answer 4

First, you can update as many parts of the page as you want when you make a jQuery call. What is the format of the data that is being returned from the call? Lets say you are returning JSON, then the JSON string should include the total. Then in the callback of the AJAX call you can simply update the total count.