Problem in observable in MVC using knockout

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Hello friends,

I have dropdown with productID as value and productName as text.

My problem is when I select particular product from dropdown, it should get other details such as QuantityPerUnit, UnitPrice and UnitsInStock.

I want to perform using knockout.

I tried following for QuantityPerUnit:

<script>
    $(document).ready(function () {
        $('#divheader').append("<h2>Please place an order</h2>");
        $.ajax({
            type: "Post",
            url: "/Order/getData",
            data: {},
            success: function (data) {

                function ReservationsViewModel() {
                    var self = this;

                    self.orderList = ko.observableArray([
                        new orderReservation(data)
                    ]);
                    self.addOrder = function () {
                        self.orderList.push(new orderReservation(data));
                    }
                }

                function orderReservation(data) {
                    var self = this;
                    self.products = ko.observable(data);
                    self.QPU = ko.computed(function () {
                        return self.products().QuantityPerUnit
                    });
                }

                ko.applyBindings(new ReservationsViewModel());
            }
        });
    });

</script>

<table>
    <thead>
        <tr>
            <th>Product Name</th>
            <th>Quantity/Unit</th>
            <th>Unit Price</th>
            <th>Unit in stock</th>
        </tr>
    </thead>
    <tbody data-bind="foreach: orderList">
        <tr>
            <td>
                <select style="width:250px;" id="ddlProduct" data-bind="options: products, optionsValue: 'ProductID', optionsText: 'ProductName', optionsCaption: 'Choose...'"></select>
            </td>
            <td data-bind="text: QPU"></td>
            <td></td>
            <td></td>
        </tr>
    </tbody>
</table>
<div>
    <button data-bind="click: addOrder">Reserve another order</button>
</div>

Dropdown is getting populated, but on change on dropdown QuantityPerUnit is not available

May i know where I'm going wrong.

Thanks in advance

Posted 20-Mar-13 1:58am

dhage.prashant01

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RomilGandhi · Answer 1 · 2013-06-28T21:02:00

you have to pass data in observable array like following

C#

<script>
    $(document).ready(function () {
        $('#divheader').append("<h2>Please place an order</h2>");
        $.ajax({
            type: "Post",
            url: "/Order/getData",
            data: {},
            success: function (data) {
 
                function ReservationsViewModel() {
                    var self = this;
 
                    self.orderList = ko.observableArray([
                        new orderReservation(data)
                    ]);
                    self.addOrder = function () {
                        self.orderList.push(new orderReservation(data));
                    }
                }
 
                function orderReservation(data) {
                    var self = this;
                    self.products = ko.observableArray(data);
                    self.QPU = ko.computed(function () {
                        return self.products().QuantityPerUnit
                    });
                }
 
                ko.applyBindings(new ReservationsViewModel());
            }
        });
    });
 
</script>
 
<table>
    <thead>
        <tr>
            <th>Product Name</th>
            <th>Quantity/Unit</th>
            <th>Unit Price</th>
            <th>Unit in stock</th>
        </tr>
    </thead>
    <tbody data-bind="foreach: orderList">
        <tr>
            <td>
                <select style="width:250px;" id="ddlProduct" data-bind="options: products, optionsValue: 'ProductID', optionsText: 'ProductName', optionsCaption: 'Choose...'"></select>
            </td>
            <td data-bind="text: QPU"></td>
            <td></td>
            <td></td>
        </tr>
    </tbody>
</table>
<div>
    <button data-bind="click: addOrder">Reserve another order</button>
</div></script>