function IsNumeric(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
};


function calcDiscount() {
    
    var DRate = $(".changediscount").val() || 0;
    $(".num-pallets-input").each(function(){    
       $(".num-pallets-input").val(DRate);
                    
    });
        
    

};


function calcProdSubTotal() {
    
    var prodSubTotal = 0;

    $(".row-total-input").each(function(){
    
        var valString = $(this).val() || 0;
        
        prodSubTotal += parseInt(valString);
                    
    });
        
    $("#product-subtotal").val(prodSubTotal);

};

function calcTotalPallets() {

    var totalPallets = 0;

    $(".num-pallets-input").each(function() {
    
        var thisValue = $(this).val();
    
        if ( (IsNumeric(thisValue)) &&  (thisValue != '') ) {
        
            totalPallets += parseInt(thisValue);
        
        };
    
    });
    
    $("#total-pallets-input").val(totalPallets);

};

function calcShippingTotal() {

    var totalPallets = $("#total-pallets-input").val() || 0;
    var shippingRate = $("#shipping-rate").text() || 0;
    var shippingTotal = totalPallets * shippingRate;
    
    $("#shipping-subtotal").val(shippingTotal);

};

function calcOrderTotal() {

    var orderTotal = 0;

    var productSubtotal = $("#product-subtotal").val() || 0;
    var shippingSubtotal = $("#shipping-subtotal").val() || 0;
        
    var orderTotal = parseInt(productSubtotal) + parseInt(shippingSubtotal);
    var orderTotalNice = "$" + orderTotal;
    
    $("#order-total").val(orderTotalNice);
        
};

$(function(){
     $('.changediscount').blur(function(){          
         calcDiscount();     
    
    });

    $('.num-pallets-input').blur(function(){
    
        var $this = $(this);
    
        var numPallets = $this.val();
        var multiplier = $this
                            .parent().parent()
                            .find("td.price-per-pallet span")
                            .text();
        
        if ( (IsNumeric(numPallets)) && (numPallets != '') ) {
            
            var rowTotal = numPallets * multiplier;
            
            $this
                .css("background-color", "white")
                .parent().parent()
                .find("td.row-total input")
                .val(rowTotal);                    
            
        } else {
        
            $this.css("background-color", "#ffdcdc"); 
                        
        };
        
        calcProdSubTotal();
        calcTotalPallets();
        calcShippingTotal();
        calcOrderTotal();
    
    });

});

function calcDiscount() {
    
    var DRate = $(".changediscount").val() || 0;
    $(".num-pallets-input").each(function(){    
      this.val(DRate);//改为this
      //计算金额，赋值等              
    });
};