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This way, the relationship between the two pages is clear, simple, and easy to maintain. You can probably change the controls in the source page (CrossPage1) without needing to change other parts of your application. For example, if you decide to use different controls for name entry in CrossPage1.aspx, you will be forced to revise the code for the FullName property. However, your changes would be confined to CrossPage1.aspx, and you wouldn t need to modify CrossPage2.aspx at all. Here s how you can rewrite the code in CrossPage2.aspx to display the information from CrossPage1.aspx: protected void Page_Load(object sender, EventArgs e) { if (PreviousPage != null) { lblInfo.Text = "You came from a page titled " + PreviousPage.Title + "<br />"; CrossPage1 prevPage = PreviousPage as CrossPage1; if (prevPage != null) { lblInfo.Text += "You typed in this: " + prevPage.FullName; } } } Notice that the target page (CrossPage2.aspx) can access the Title property of the previous page (CrossPage1.aspx) without performing any casting. That s because the Title property is defined as part of the base System.Web.UI.Page class, and so every web page includes it. However, to get access to the more specialized FullName property you need to cast the previous page to the right page class (CrossPage1), or use the PreviousPageType directive that was discussed earlier. Figure 7-5 shows the new result.

Listing 12-13. Grade Model (app/models/grade.rb)

s Note Cross-page postbacks are genuinely useful, but they can lead the way to more complicated pages.

If you allow multiple source pages to post to the same destination page, it s up to you to code the logic that figures out which page the user came from and then act accordingly. To avoid these headaches, it s easiest to perform cross-page postbacks between two specific pages only.

Save this as app/models/grade.rb. Finally, create the last model, training_class:

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This fundamental difference between Spring and Java EE feeds the second statement that Spring reduces development efforts and costs while improving test coverage and quality. Applications that utilize Java EE services must be executed within a Java EE application server. This makes unit testing much harder, because artifacts like session beans and entity beans must be compiled and deployed to the Java EE application server before they can be executed. Spring applications, on the other hand, can be unit-tested without an application server, which simplifies the code-test-repeat cycle.

ASP .NET uses some interesting sleight of hand to make cross-page postbacks work. The first time the second page accesses Page.PreviousPage, ASP .NET needs to create the previous page object. To do this, it actually starts the page processing but interrupts it just before the PreRender stage, and it doesn t let the page render any HTML output. However, this still has some interesting side effects. For example, all the page events of the previous page are fired, including Page.Load and Page.Init, and the Button.Click event also fires for the button that triggered the cross-page postback. ASP .NET fires these events because they might be needed to return the source page to the state it was last in, just before it triggered the cross-page postback.

Another common approach is to pass information using a query string in the URL This approach is commonly found in search engines For example, if you perform a search on the Google website, you ll be redirected to a new URL that incorporates your search parameters Here s an example: http://wwwgoogleca/search q=organic+gardening The query string is the portion of the URL after the question mark In this case, it defines a single variable named q, which contains the string organic+gardening The advantage of the query string is that it s lightweight and doesn t exert any kind of burden on the server However, it also has several limitations: Information is limited to simple strings, which must contain URL-legal characters Information is clearly visible to the user and to anyone else who cares to eavesdrop on the Internet.

app/models/ test/unit/ test/fixtures/ app/models/training_class.rb test/unit/training_class_test.rb test/fixtures/training_class.yml

The enterprising user might decide to modify the query string and supply new values, which your program won t expect and can t protect against Many browsers impose a limit on the length of a URL (usually from 1KB to 2KB) For that reason, you can t place a large amount of information in the query string and still be assured of compatibility with most browsers Adding information to the query string is still a useful technique It s particularly well suited in database applications where you present the user with a list of items that correspond to records in a database, such as products The user can then select an item and be forwarded to another page with detailed information about the selected item One easy way to implement this design is to have the first page send the item ID to the second page.

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