vb net code 128 barcode generator Providing a page indicator in our markup in .NET framework

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Listing 20.14 Providing a page indicator in our markup
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<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <input type="hidden" name="pageId" value="<%= LocalSiteMap.Screen.Product.Index %>" /> <h2>Products</h2>
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In listing 20.14, we include a well-known hidden input element with a name of "pageId" and a value referencing our site structure as a constant. The navigational object structure is designed to be easily recognizable this example indicates the product index page. The actual value is a simple string, as shown in listing 20.15.
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Listing 20.15 Site structure in a well-formed object model
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public static class LocalSiteMap { public static class Screen { public static class Product { public static readonly string Index = "productIndex"; } } }
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Our site structure is exposed as a hierarchical model in listing 20.15, finally exposing a constant value. It s this constant value that s used in the hidden input element.
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Asserting results
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With this input element in place, we can now assert our page simply by looking for this element and its value, as shown in listing 20.16.
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Listing 20.16 Asserting for a specific page
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[Test] public void Should_update_product_price_successfully() { NavigateLink(LocalSiteMap.Nav.Products); Browser.Link(Find.ByText("Edit")).Click(); ForForm<ProductForm>() .WithTextBox(form => form.Price, 389.99m) .Save(); CurrentPageShouldBe( LocalSiteMap.Screen.Product.Index); }
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Assert location of current page
The CurrentPageShouldBe method in listing 20.16 encapsulates the work of locating the well-known input element and asserting its value. We pass in the same constant value B to assert against as was used to generate the original HTML. Again, we share information between our view and test to ensure that our tests don t become brittle. The CurrentPageShouldBe method, shown in listing 20.17, is defined on the base WebTestBase class so that all UI tests can use this method.
Listing 20.17 The CurrentPageShouldBe method
protected void CurrentPageShouldBe(string pageId) { Browser.TextField(Find.ByName("pageId")).Value.ShouldEqual(pageId); }
Finally, we need to assert that our application changed the price value correctly. This will require some additional work in our view, because it s currently quite difficult to locate a specific data-bound HTML element. The original test merely searched for the price text anywhere in the page. But this means that our test could pass even if the price wasn t updated, because the text for the price might show up for something unrelated, such as another product, the version text at the bottom of the screen, the shopping cart total, and so on. Instead, we need to use a similar tactic of displaying our information as we did for rendering our edit templates. We ll use the expression-based display templates, as shown in listing 20.18.
Listing 20.18 Using expression-based display templates
<table> <thead> <tr> <td>Details</td>
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<td>Name</td> <td>Manufacturer</td> <td>Price</td> </tr> </thead> <tbody> <% var i = 0; %> <% foreach (var product in products) { %> <tr> <td><%= Html.ActionLink("Edit", "Edit", new { id = product.Id }) %></td> Uses expression<td> based templates <%= Html.DisplayFor(m => m[i].Name) %> </td> <td><%= Html.DisplayFor(m => m[i].ManufacturerName)%></td> <td><%= Html.DisplayFor(m => m[i].Price)%></td> </tr> <% i++; } %> </tbody> </table>
We need to utilize the full expression, including the array index, with the expression-based display templates B. Out of the box, the display templates for strings are just the string values themselves. We want to decorate this string with identifying information, in the form of a span tag. This is accomplished quite easily by overriding the string display template. First, we need to add a new string template file in our Shared Display Templates folder, as shown in figure 20.5. The string.ascx template is modified in listing 20.19 to include a span tag with an ID derived using the TemplateInfo.GetFullHtmlFieldId method.
Listing 20.19 The updated string display template
Figure 20.5 Adding the new string template
<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %> <span id="<%= ViewData.TemplateInfo.GetFullHtmlFieldId(null) %>"> <%= Html.Encode(ViewData.TemplateInfo.FormattedModelValue) %> </span>
The span tag wraps the entire value displayed with a well-formed ID derived from the expression originally used to display this template. In listing 20.19, the original expression m => m[i].Name would result in a runtime span ID of "[0]_Name". Because the array index is included in the span ID, we can distinguish this specific model value apart from any other product shown on the screen. We don t need to search for items matching generic values; we can navigate directly to the correct rendered model value. In our test, we build a FluentPage object. This is a similar abstraction to the FluentForm that we saw earlier, but FluentPage provides a way to assert information
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