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In this example, you ll update the previous example to add validation Web controls to prevent the user from entering incorrect data into the database. 1. Open Players_Insert.aspx and switch to the Design view. 2. Add a ValidationSummary from the Validation tab of the Toolbox to the top of the page. 3. Add a RequiredFieldValidator to the start of the Player Name line. Set its Display property to Dynamic, Text property to *, and ErrorMessage property to You must enter a name. Finally set the ControlToValidate property to PlayerName. The page should look like the one shown in Figure 8-9.

yet created. In order to emulate Figure 9-2, you can either remove this from the code temporarily or create the ./templates/user/lib/left-column.tpl file. We will implement this template later in this chapter.

s Note Unlike with web controls, you can t create event handlers for HTML server controls using the

Properties window. Instead, you must type the method in by hand. You must also modify the control tag to connect your event handler. For example, to connect the Convert button to the method named Convert_ServerClick, you must add OnServerClick="Convert_ServerClick" to the control tag.

Figure 8-9. Adding the first validation Web controls 4. Save the page, and then view it in your browser. Try saving a Player without a name. As soon as you click the Insert Player button, you ll receive an error, as shown in Figure 8-10, without a postback to the server being made.

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In the previous section, we created the indexAction() method, which displayed a list of the most recent blog posts, each with a link to view the full details. We will now implement viewAction(), which will display the full details of the post. For now, all the page will show is the title, timestamp, and body content of the post, but we will expand this page in later chapters when we add more functionality to the blogging system (such as tags, images, and maps). Because of the custom route we added earlier in this chapter, the viewAction() method will be accessed using a URL of http://phpweb20/user/username/view/blogposturl. This

The += operator is used to quickly add information to the end of the label, without replacing the existing text. The event handler uses ToString() to convert the decimal value to text so it can be added to the InnerText property. In this particular statement, you don t need ToString(), because C# is intelligent enough to realize you re joining together pieces of text. However, this isn t always the case, so it s best to be explicit about data-type conversions. You can launch this page to test your code. When you enter a value and click the OK button, the page is resubmitted, the event-handling code runs, and the page is returned to you with the conversion details (see Figure 5-3).

Figure 8-10. The validation Web controls in action 5. Add a CompareValidator to the start of the Manufacturer line. Set its properties as follows: Display: Dynamic Text: * ErrorMessage: You must select a manufacturer ControlToValidate: ManufacturerList Operator: NotEqual ValueToCompare: 0

means that in order to access the requested blog post URL, we must fetch the url user parameter using $request->getUserParam('url'). We can then load the blog post that corresponds to this URL value for the current user.

.NET When the user clicks the Covert button and the page is sent back to the web server, ASP needs to know exactly what code you want to run. To create this relationship and connect an event to an event-handling method, you need to add an attribute in the control tag. For example, if you want to handle the ServerClick method of the Convert button, you simply need to set the OnServerClick attribute in the control tag with the name of the event handler you want to use: <input type="submit" value="OK" ID="Convert" OnServerClick="Convert_ServerClick" runat="server">

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