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POWhy Can't I Use ko.computed() in Knockoutjs?
 

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  1. POWhy Can't I Use ko.computed() in Knockoutjs?
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    <p>I am new to using knockoutjs and I encountered this problem when using .computed()</p> <p>here is my HTML Code:</p> <pre class="lang-html prettyprint-override"><code>&lt;table style="float:left;padding-right:250px" cellspacing="3"&gt; &lt;tr&gt; &lt;td&gt;Product Name&lt;/td&gt; &lt;td&gt;Price&lt;/td&gt; &lt;td&gt;Stocks&lt;/td&gt; &lt;/tr&gt; &lt;tbody data-bind="foreach: Products"&gt; &lt;tr&gt; &lt;td&gt;&lt;a href="#" data-bind="text: Name, click:$root.addProduct, value: Name"&gt;&lt;/a&gt;&lt;/td&gt; &lt;td&gt;&lt;input data-bind="value: Price" size="3"/&gt;&lt;/td&gt; &lt;td data-bind="text:Stocks"&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; &lt;/table&gt; &lt;table style="float:left"&gt; &lt;tr&gt; &lt;td&gt;SKU&lt;/td&gt; &lt;td&gt;Product Name&lt;/td&gt; &lt;td&gt;Price&lt;/td&gt; &lt;td&gt;Qty&lt;/td&gt; &lt;td&gt;Sub&lt;/td&gt; &lt;/tr&gt; &lt;tbody data-bind="foreach: Cart"&gt; &lt;tr&gt; &lt;td data-bind="text: SKU"&gt;&lt;/td&gt; &lt;td data-bind="text: Name"&gt;&lt;/td&gt; &lt;td data-bind="text: Price"&gt;&lt;/td&gt; &lt;td data-bind="text: Quantity"&gt;&lt;/td&gt; &lt;td data-bind="text: SubTotal()"&gt;&lt;/td&gt; &lt;td&gt;&lt;a href="#" data-bind="click: $root.removeProduct"&gt;Remove&lt;/a&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/tbody&gt; </code></pre> <p> ​</p> <p>And here is my Script Code:</p> <pre><code>var Product = function(data) { var self = this; self.SKU = ko.observable(data.SKU); self.Name = ko.observable(data.Name); self.Price = ko.observable(data.Price); self.Stocks = ko.observable(data.Stocks); self.Quantity = ko.observable(data.Quantity); self.SubTotal = ko.computed(function() { return self.Quantity() * self.Price(); }); }; function ProductViewModel() { var self = this; var items = [{ Name: "Crystalys", SKU: "00001", Price: 500, Stocks: 12, Quantity: 0}, { Name: "Aghanim's Scepter", SKU: "00002", Price: 4200, Stocks: 5, Quantity: 0}, { Name: "Vladmir's Offering", SKU: "00003", Price: 500, Stocks: 10, Quantity: 0}, { Name: "Pwer Threads", SKU: "00004", Price: 1450, Stocks: 20, Quantity: 0}, { Name: "Satanic", SKU: "00005", Price: 6150, Stocks: 5, Quantity: 0}, { Name: "The Butterfly", SKU: "00006", Price: 6000, Stocks: 4, Quantity: 0}, { Name: "Divine Rapier", SKU: "00007", Price: 6200, Stocks: 1, Quantity: 0}, { Name: "Iron Wood Branch", SKU: "00008", Price: 53, Stocks: 100, Quantity: 0}]; self.Products = ko.observableArray(items); self.Cart = ko.observableArray(); // Operations self.addProduct = function(Product) { self.Cart.push({ Name: Product.Name, Price: Product.Price, Quantity: 1, SKU: Product.SKU }); } self.removeProduct = function(Product) { self.Cart.remove(Product) } } ko.applyBindings(new ProductViewModel());​ </code></pre> <p>I really don't know what seem to be the error. Please help. Thank you in advance.</p>
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