我是新来的Laravel。添加到购物车按钮添加相同的产品到购物车与1数量。试图检查库存是否大于数量。当一个项目是数量3比2的股票，我想显示一些文字“请求的数量不可用”，而不是表单提交。这有可能吗？
总库存有2.
问题是，同一产品的购物车中添加的数量越多，则数量越大。不阻止添加到购物车“请求的数量不可用”。谁能帮帮我吗。
内部控制器
public function add_to_cart(Request $request)
{
$name = $request->product_name;
$price = $request->product_price;
$itemno = $request->product_itemno;
$qty = $request->product_quantity;
$color = $request->product_color;
$size = $request->product_size;
$stock = products::join('stocks', 'stocks.pid', 'products.id')
->join('sizes', 'sizes.pid', 'products.id')
->where([['products.item_no', '=', $itemno],['sizes.size_name', '=', $size]])
->first();
// Current stock quantity
$stockqty = $stock->qty;
if($qty <= $stockqty)
{
echo "<p>was successfully added to your shopping cart</p>";
Cart::add([
'id' => $itemno,
'weight' => 500,
'name' => $name,
'price' => $price,
'qty' => $qty,
'color' => $color,
'size' => $size
]);
}
else
{
echo "<p>The Requested quantity for this product is not available.</p>";
}
}
在Ajax中
$(document).ready(function()
{
$(document).on('click','#add_to_cart',function (e) {
var cart_count = $('.navbar-tool-badge').text();
cart_count = parseInt(cart_count);
if($('input[type=radio][name=size]:checked').length == 0)
{
$('.msg').html('Please choose size.');
return false;
} else {
var product_name = $('#hidden-name').val();
var product_price = $('#hidden-price').val();
var product_itemno = $('#itemno').val();
var product_quantity = $('.quantity').val();
var product_color = $('#color').val();
var product_size = $("input[name='size']:checked").val();
e.preventDefault();
$.ajax
({
method:"POST",
url: "{{ route('add_to_cart')}}",
data:{
"_token": "{{ csrf_token() }}",
product_name:product_name,
product_price:product_price,
product_itemno:product_itemno,
product_quantity:product_quantity,
product_color:product_color,
product_size:product_size},
cache: false,
success: function(response)
{
$("#getCode").html(response);
$("#myModal").modal('show');
}
});
}
});
});
只要执行add\u to\u cart，您就可以在会话中输入添加到购物车的每个产品数量的值。像下面这样的方法应该可以奏效。
public function add_to_cart(Request $request)
{
//You should get only the id of the product and cart from the frontend
//via ajax request
//Then you should fetch the Product record from database for that id
$product = Product::findOrFail($request->pid);
$cart = Cart::findOrFail($request->cid);
$sessionKey = "Cart-{$cart->id}-{$product->id}";
$session = $request->session();
$requestedQty = $request->product_quantity;
$desiredQty = 0;
//Get the stock data
$stock = products::join('stocks', 'stocks.pid', 'products.id')
->join('sizes', 'sizes.pid', 'products.id')
->where([
['products.item_no', '=', $itemno],
['sizes.size_name', '=', $size]
])
->first();
// Current stock quantity
$stockqty = $stock->qty;
//If the requested quantity is greater than the available stock
//when the product is added for the first time, send out of stock
if($requestedQty > $stockqty) {
echo "<p>The Requested quantity for this product is not available.</p>";
}
//When a product is added for the first time session won't have entry
if(empty($session->get($sessionKey)){
$desiredQty = $requestedQty;
$session->put($sessionKey, $requestedQuantity);
} else {
$desiredQty = $session->get($sessionKey) + $requestedQty;
}
if($desiredQty > $stockqty) {
echo "<p>The Requested quantity for this product is not available.</p>";
}
//Overwrite the session entry with the new quantity
$session->put($sessionKey, $desiredQty);
echo "<p>was successfully added to your shopping cart</p>";
Cart::add([
'id' => $itemno,
'weight' => 500,
'name' => $name,
'price' => $price,
'qty' => $requestedQty,
'color' => $color,
'size' => $size
]);
}
