Add products on shopping cart - codeigniter

Question

Friends, I am developing an e-commerce website (using Codeigniter).
After the customer fill out the amount of products and click "Buy", only products with the field "quantity" are to be filled in cart. Can you help me?
HTML:
<form>
<ul class="products-list">
<li class="product">
<input type="hidden" class="product_id" value="1">
<span class="product-name">Product 1</span>
<span class="product-value">$ 100</span>
<span>Qnt. <input type="text" class="quantity"></span>
</li>
<li class="product">
<input type="hidden" class="product_id" value="2">
<span class="product-name">Product 2</span>
<span class="product-value">$ 100</span>
<span>Qnt. <input type="text" class="quantity"></span>
</li>
</ul>
<button>Buy</button>
</form>
jQuery:
$.ajax({
url: '/cart/add/'+product_id+'/'+quantity,
type: 'GET',
success: function( data ){
if ( data != false ) {
window.location.reload();
}
}
});
My PHP Code:
public function addItem( $product_id, $quantity){
$product = $this->Produto_model->getById($product_id);
$this->carrinho->setItem($product, $quantity);
echo json_encode($this->carrinho);
}

Answer 1

Try like this
HTML:
<form id="form-cart">
<ul class="products-list">
<li class="product">
<input type="hidden" class="product_id" value="1">
<span class="product-name">Product 1</span>
<span class="product-value">$ 100</span>
<span>Qnt. <input type="text" class="quantity" value="1"></span>
</li>
<li class="product">
<input type="hidden" class="product_id" value="2">
<span class="product-name">Product 2</span>
<span class="product-value">$ 100</span>
<span>Qnt. <input type="text" class="quantity" value="1"></span>
</li>
</ul>
<button id="form-cart-btn">Buy</button>
</form>
<script type="text/javascript">
$("#form-cart #form-cart-btn").click(function(){
form = $("#form-cart");
items = [];
form.find('li').each(function(i, e){
_e = $(e);
qty = parseInt(_e.find('.quantity').val());
if(isNaN(parseFloat(qty)) || ! isFinite(qty) || qty == 0)
return;
id = _e.find('.product_id').val();
items.push('item[' + id + ']=' + qty);
});
items = items.join('&');
$.ajax({
url: '/cart/add/?' + items,
dataType: 'json',
success: function(response)
{
if(response.status != 'success')
return false;
window.location.reload();
}
});
return false;
});
</script>
Cart Controller:
class Cart extends CI_Controller
{
public function add()
{
$items = isset($_GET['items']) ? $_GET['items'] : array();
foreach($items as $product_id => $qty)
{
$product = $this->Produto_model->getById($product_id);
if( ! $product)
{
++$i;
continue;
}
$this->carrinho->setItem($product, $qty);
++$i;
}
header("Content-type: application/json");
echo json_encode(array('status'=>'success'));
exit();
}
}