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To understand how validation works, you can create a simple web page. This test uses a single Button web control, two TextBox controls, and a RangeValidator control that validates the first text box. If validation fails, the RangeValidator control displays an error message, so you should place this control immediately next to the TextBox it s validating. The second text box does not use any validation. Figure 10-1 shows the appearance of the page after a failed validation attempt.

Figure 10-1. Failed validation In addition, place a Label control at the bottom of the form. This label will report when the page has been posted back and the event-handling code has executed. Disable its EnableViewState property to ensure that it will be cleared every time the page is posted back. The markup for this page defines a RangeValidator control, sets the error message, identifies the control that will be validated, and requires an integer from 1 to 10. These properties are set in the .aspx file, but they could also be configured in the event handler for the Page.Load event. The Button automatically has its CauseValidation property set to True, because this is the default.

A number (1 to 10): <asp:TextBox id="txtValidated" runat="server" /> <asp:RangeValidator id="RangeValidator" runat="server" ErrorMessage="This Number Is Not In The Range" ControlToValidate="txtValidated" MaximumValue="10" MinimumValue="1" Type="Integer" /> <br /><br /> Not validated: <asp:TextBox id="txtNotValidated" runat="server" /><br /><br /> <asp:Button id="cmdOK" runat="server" Text="OK" /> <br /><br /> <asp:Label id="lblMessage" runat="server" EnableViewState="False" /> Finally, here is the code that responds to the button click: Protected Sub cmdOK_Click(ByVal sender As Object, _ ByVal e As SystemEventArgs) Handles cmdOKClick lblMessageText = "cmdOK_Click event handler executed" End Sub If you re testing this web page in a modern browser, you ll notice an interesting trick When you first open the page, the error message is hidden But if you type an invalid number (remember, validation will succeed for an empty value) and press the Tab key to move to the second text box, an error message will appear automatically next to the offending control.

Before you can use the Ajax helper, one or two important steps must be taken that are unique to this helper. Because it depends on Prototype, you must ensure that Prototype JavaScript files are included in each page. You will also need to make these scripts accessible for all the views that could potentially use the Ajax helper.

This is because ASPNET adds a special JavaScript function that detects when the focus changes The actual implementation of this JavaScript code is somewhat complicated, but ASPNET handles all the details for you automatically As a result, if you try to click the OK button with an invalid value in txtValidated, your actions will be ignored and the page won t be posted back Not all browsers will support client-side validation To see what will happen on a downlevel browser, set the RangeValidatorEnableClientScript property to False, and rerun the page Now error messages won t appear dynamically as you change focus However, when you click the OK button, the page will be returned from the server with the appropriate error message displayed next to the invalid control.

The potential problem in this scenario is that the click event-handling code will still execute, even though the page is invalid To correct this problem and ensure that your page behaves the same on modern and older browsers, you must specifically abort the event code if validation hasn t been performed successfully Protected Sub cmdOK_Click(ByVal sender As Object, _ ByVal e As SystemEventArgs) Handles cmdOKClick ' Abort the event if the control isn't valid If Not RangeValidatorIsValid Then Return lblMessageText = "cmdOK_Click event handler executed" End Sub.

Download the latest version of Prototype from www.prototypejs.org/download. You should end up with a JavaScript file named something like prototype-1.x.x.x.js. Place this file in the app/webroot/js folder. It is now accessible by the whole application. To finish installing Prototype, you need to edit the default layout. Somewhere between the <head> tags in the app/views/layouts/default.ctp file, include the following line: $javascript->link(array('prototype')); Here, you are using the JavaScript helper to produce a link to the JavaScript file. These links appear something like this to include the script in the web page: <script type="text/javascript" src="/js/prototype.js"></script> Of course, the JavaScript helper automatically produces the correct URL to the JavaScript file.