Ashhh Ashhh - 2 months ago 29
jQuery Question

How to limit the number of items to be accepted by the droppable div(shopping cart) using jquery

I am very new to jquery.I want to limit the number of items to be dragged in the droppable shopping cart.

eg:shopping cart should accept only three items on drop after that it should not accept any item.

jsfiddle:http://jsfiddle.net/Vwu37/

I have tried all other duplicates but din't work for me..
Any one out there please help me.

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="keywords" content="jquery,ui,easy,easyui,web">
<meta name="description" content="easyui help you build your web page easily!">
<title>jQuery EasyUI Demo</title>
<link rel="stylesheet" type="text/css" href="http://www.jeasyui.com/easyui/themes/default/easyui.css">
<link rel="stylesheet" type="text/css" href="http://www.jeasyui.com/easyui/themes/icon.css">
<script type="text/javascript" src="http://code.jquery.com/jquery-1.6.1.min.js"></script>
<script type="text/javascript" src="http://www.jeasyui.com/easyui/jquery.easyui.min.js"></script>
<style type="text/css">
.products{
list-style:none;
margin-right:300px;
padding:0px;
height:100%;
}
.products li{
display:inline;
float:left;
margin:10px;
}
.item{
display:block;
text-decoration:none;
}
.item img{
border:1px solid #333;
}
.item p{
margin:0;
font-weight:bold;
text-align:center;
color:#c3c3c3;
}
.cart{
position:fixed;
right:0;
top:0;
width:300px;
height:100%;
background:#ccc;
padding:0px 10px;
}
h1{
text-align:center;
color:#555;
}
h2{
position:absolute;
font-size:16px;
left:10px;
bottom:20px;
color:#555;
}
.total{
margin:0;
text-align:right;
padding-right:20px;
}
</style>
<script>
var data = {"total":0,"rows":[]};
var totalCost = 0;

$(function(){
$('#cartcontent').datagrid({
singleSelect:true
});
$('.item').draggable({
revert:true,
proxy:'clone',
onStartDrag:function(){
$(this).draggable('options').cursor = 'not-allowed';
$(this).draggable('proxy').css('z-index',10);
},
onStopDrag:function(){
$(this).draggable('options').cursor='move';
}
});
$('.cart').droppable({
onDragEnter:function(e,source){
$(source).draggable('options').cursor='auto';
},
onDragLeave:function(e,source){
$(source).draggable('options').cursor='not-allowed';
},
onDrop:function(e,source){
var name = $(source).find('p:eq(0)').html();
var price = $(source).find('p:eq(1)').html();
addProduct(name, parseFloat(price.split('$')[1]));
}
});
});

function addProduct(name,price){
function add(){
for(var i=0; i<data.total; i++){
var row = data.rows[i];
if (row.name == name){
row.quantity += 1;
return;
}
}
data.total += 1;
data.rows.push({
name:name,
quantity:1,
price:price
});
}
add();
totalCost += price;
$('#cartcontent').datagrid('loadData', data);
$('div.cart .total').html('Total: $'+totalCost);
}
</script>
</head>
<body style="margin:0;padding:0;height:100%;background:#fafafa;">
<ul class="products">
<li>
<a href="#" class="item">
<img src="images/shirt1.gif"/>
<div>
<p>Balloon</p>
<p>Price:$25</p>
</div>
</a>
</li>
<li>
<a href="#" class="item">
<img src="images/shirt2.gif"/>
<div>
<p>Feeling</p>
<p>Price:$25</p>
</div>
</a>
</li>
<li>
<a href="#" class="item">
<img src="images/shirt3.gif"/>
<div>
<p>Elephant</p>
<p>Price:$25</p>
</div>
</a>
</li>
<li>
<a href="#" class="item">
<img src="images/shirt4.gif"/>
<div>
<p>Stamps</p>
<p>Price:$25</p>
</div>
</a>
</li>
<li>
<a href="#" class="item">
<img src="images/shirt5.gif"/>
<div>
<p>Monogram</p>
<p>Price:$25</p>
</div>
</a>
</li>
<li>
<a href="#" class="item">
<img src="images/shirt6.gif"/>
<div>
<p>Rolling</p>
<p>Price:$25</p>
</div>
</a>
</li>
</ul>
<div class="cart">
<h1>Shopping Cart</h1>
<div style="background:#fff">
<table id="cartcontent" fitColumns="true" style="width:300px;height:auto;">
<thead>
<tr>
<th field="name" width=140>Name</th>
<th field="quantity" width=60 align="right">Quantity</th>
<th field="price" width=60 align="right">Price</th>
</tr>
</thead>
</table>
</div>
<p class="total">Total: $0</p>
<h2>Drop here to add to cart</h2>
</div>
</body>
</html>

Answer

here you go.. Modified your addProduct function to check for 3 items in data.total. if not give an alert..

try this

    function addProduct(name,price){
    if(data.total < 3){
       function add(){
         for(var i=0; i<data.total; i++){
            var row = data.rows[i];
            if (row.name == name){
                row.quantity += 1;
                return;
            }
         }
        data.total += 1;
        data.rows.push({
            name:name,
            quantity:1,
            price:price
        });
       }
        add();
        totalCost += price;
        $('#cartcontent').datagrid('loadData', data);
        $('div.cart .total').html('Total: $'+totalCost);
      }else{
        alert('cannot have more than 3 itrems');
      }
}

fiddle here

updated

if you need to check for quantity then.. check for quantity instead of total.. :)

try this

 function addProduct(name,price){
    var totalQuantity=sumQuantity(data);

    if(totalQuantity < 3){
    function add(){
        for(var i=0; i<data.total; i++){
            var row = data.rows[i];
            if (row.name == name){
                row.quantity += 1;
                return;
            }
        }
        data.total += 1;
        data.rows.push({
            name:name,
            quantity:1,
            price:price
        });
    }
    add();
    totalCost += price;
    $('#cartcontent').datagrid('loadData', data);
    $('div.cart .total').html('Total: $'+totalCost);
    }else{
        alert('cannot have more than 3 itrems');
    }
}

//new function to sum up all the quantity.
function sumQuantity(data){
   var sum=0;
   for(var i=0; i<data.total; i++){
     sum += data.rows[i].quantity;
   }
   return sum;    
}

updated fiddle