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    <p>I recommend you to take a look at <a href="http://api.jquery.com/jQuery.post/" rel="nofollow">jQuery.post() method</a> of jQuery library.</p> <p>Let's see the following example: </p> <p>Javascript code:</p> <pre><code>$("#submit-button").click(function(){ $.POST("/PATH_TO/update_cart.php", {product_id:$('#product-id').val(),quantity:$('#quntity').val()}, function(data){ if(data.success) { $("#form-field-id").val(data.some_returned_value); // update value of an text input or textarea (view more info about jQuery selectors) $("p#form-p-id").html(data.some_other_returned_value); // update value of a paragraph } }, 'json'); }); </code></pre> <p>For more info about <strong>jQuery Selectors</strong> please <a href="http://api.jquery.com/category/selectors/" rel="nofollow">check this</a></p> <p>PHP code:</p> <pre><code>&lt;?php $success = false; if(loged()) { // verify if the user is loged (if it's needed) if(!empty($_POST['product_id']) &amp;&amp; is_numeric($_POST['product_id']) &amp;&amp; !empty($_POST['quantity']) &amp;&amp; is_numeric($_POST['quantity'])) { // use here your additional code // update database // if every condition is applied then confirm that the fields are updated $success = true; $some_returned_value = "data has been successfully updated"; $some_other_returned_value = 45.3; // the final price } } echo json_encode(array("success" =&gt; $success, "some_returned_value" =&gt; $some_returned_value, "some_other_returned_value" =&gt; $some_other_returned_value)); ?&gt; </code></pre> <p>This is a simple example about how you can use jQuery POST method and PHP for updating data you want. I didn't use any of your code, but you can try to update your cart like this. jQuery is a powerfull library, so I'll recommend you to take a look at it.</p>
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    1. POHow can I update my cart with Ajax?
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    1. COthank you, so, I can use your first function to call my price() php function, ok, but how do I use Json ? do I have to simply fill that array and then write down '}, 'json');' at the end of the first function ?
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    2. COyou're right, json is a parameter for the $.POST method, so if you use it then you have to use the function json_encode() in the php file for returning the right type of data
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