validate.js | A declarative validation library written javascript | Validation library

// jQuery for the AddToCart Button
$('#btnAddToCart').click(function () {
    var itemID = $('#Item_ID').val();
    var itemName = $('#Item_Name').val();
    var salesprice = parseFloat($('#salesPrice').val()).toFixed(2);
    var Qty = $('#Qty').val();
    var amount = $('#Amount').val();
    var newstock = stock - Qty;


    if ($('#Item_ID').val() == '' || $('#Item_ID').val() == undefined) {
        alert('Please Select an Item to Add to Cart');
        return false;
    }

    if ($('#Qty').val() == '' || $('#Qty').val() == undefined || $('#Qty').val() == 0) {
        alert('Please Enter the Qty of The Item Been Purchased');
        return false;
    }

    if ($('#salesPrice').val() == '' || $('#salesPrice').val() == undefined || $('#salesPrice').val() == 0) {
        alert('Please Enter the Qty of The Item Been Purchased');
        return false;
    }

    if (itemDiscontinued == 'Yes') {
        alert('The Item Selected has been Discontinued and cannot be sold');
        $('#Item_ID').val('');
        $('#Item_Name').val('');
        $('#salesPrice').val('');
        $('#Qty').val('');
        $('#Amount').val('');
        return false;
    }

    if (newstock < 0) {
        alert('The Qty of ' + $('#Item_Name').val() + ' Selected to be purchased is more than what is in store, Please replenish item');
        $('#Item_ID').val('');
        $('#Item_Name').val('');
        $('#salesPrice').val('');
        $('#Qty').val('');
        $('#Amount').val('');
        return false;
    }

    // Check if the Item is already in Cart
    var $tds = $('#tblCart tr > td:nth-child(2)').filter(function () {
        return $.trim($(this).text()) == itemID;
    });
    if ($tds.length != 0) {
        alert("Item already in Cart");
        $('#Item_ID').val('');
        $('#Item_Name').val('');
        $('#salesPrice').val('');
        $('#Qty').val('');
        $('#Amount').val('');
        return false;
    }

    // Build up the table row
    var tbody = $('#tblCart tbody');
    var tr = $('');
    tr.append("' Remove '")
    tr.append('' + itemID + '');
    tr.append('' + itemName + '');
    tr.append('' + salesprice + '');
    tr.append('' + Qty + '');
    tr.append('' + amount + '');
    tbody.append(tr);

    totalAmount += Number(amount);
    $('#Total_Amount').val(parseFloat(totalAmount).toFixed(2));

    // Empty the Textboxes to allow for new item
    $('#Item_ID').val('');
    $('#Item_Name').val('');
    $('#salesPrice').val('');
    $('#Qty').val('');
    $('#Amount').val('');
});

// Checkout and Save Transactions To Database
$('#btnCheckOut').click(function() {
    // First check if the TableCart is not empty 
    if ($('#tblCart tr').length <= 1) {
        alert('The Cart is Empty, Please add Items to Cart');
        return false;
    }

    if ($('#Amount_Tendered').val() == '' || $('#Amount_Tendered').val() == undefined || $('#Amount_Tendered').val() <= 0) {
        alert('Please Enter the Amount Tendered by Customer');
        return false;
    }

    if ($('#Payment_Method').val() == '' || $('#Payment_Method').val() == undefined) {
        alert('Please Select the Payment Method');
        return false;
    }

    var totalAmount = parseFloat($('#Total_Amount').val());
    var changeReceived = parseFloat($('#Change_Received').val());

    if (changeReceived < 0 ) {
        alert('The Amount Tendered Cannot be Less than Total Amount');
        return false;
    }

    finalPayment();  //Call the finalpayment method
    EmptyControls(); //Calling the Empty control mehod
    loaddata();  //Items to be reloaded
});

// Function to Delete Row from Cart
function deleterow(e) {
    var amount = parseFloat($(e).parent().parent().find('td:last').text(), 10);
    totalAmount -= amount;
    $('#Total_Amount').val(totalAmount);
    $(e).parent().parent().remove();
}

//Function to send cart table to controller
function finalPayment() {
    var totalAmount = $('#Total_Amount').val();
    var paymentMethod = $('#Payment_Method').val();
    var amountTendered = $('#Amount_Tendered').val();
    var changeReceived = $('#Change_Received').val();
    var customerID = $('#Customer_ID').val();
    var orderdetails = new Array();

    $('#tblCart tr:not(:first)').each(function() {
        var row = $(this);
        var orderdetail = {};
        orderdetail.Item_ID = row.find("TD").eq(1).html();
        orderdetail.Item_Name = row.find("TD").eq(2).html();
        orderdetail.salesPrice = row.find("TD").eq(3).html();
        orderdetail.Qty = row.find("TD").eq(4).html();
        orderdetail.Amount = row.find("TD").eq(5).html();
        orderdetails.push(orderdetail);
    });

    $.ajax({
        async: true,
        type: "POST",
        url: "/Transactions/Transactions/InsertOrders",
        //data: JSON.stringify(orderdetails),
        data: JSON.stringify({
            orderdetails: orderdetails,
            totalAmount: totalAmount,
            paymentMethod: paymentMethod,
            amountTendered: amountTendered,
            changeReceived: changeReceived,
            customerID: customerID
        }),
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (data) {
            alert(data);
        },
        error: function () {
            alert("Something went wrong, processing not completed");
        }
    });
}