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Table 14-5. Common ASP.NET Server Controls
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Button, TextBox, Label, Panel, CheckBox, ListBox, RadioButton, PlaceHolder, DropDownList Repeater, DataList, GridView, DetailsView ObjectDataSource, SqlDataSource Login, LoginView RequiredFieldValidator, CompareValidator, RegularExpressionValidator
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CH APT ER 14 BUI LDI NG WE B APPLIC AT I ONS
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HTML server controls correspond to a given HTML tag and are simply applied by adding the runat="server" attribute. This turns the standard HTML tag into a server control, allowing you to change its appearance or behavior programmatically. Since web server controls offer a more robust object model, they are almost always preferable to HTML server controls. Validation controls are a special type of web controls that perform typical validation patterns on your web form input fields and display error messages where appropriate. The Validation section of your Visual Studio Toolbox contains the available validation controls, as summarized in Table 14-6.
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Table 14-6. Common ASP.NET Validation Controls
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Control Name
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RequiredFieldValidator RangeValidator RegularExpressionValidator
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Description
Ensures that the associated input control is not empty. Validates that the user input is in a given range. Checks whether the user input matches a regular expression pattern. See 10 for a description of using .NET regular expressions. Compares the user input against a given value or another control. Validates the user input based on a custom, user-specified logic. Lists all validation error messages.
CompareValidator CustomValidator ValidationSummary
Each validator has an ErrorMessage and a Text property that you can set in conjunction with displaying an error message. When the validator fails, it displays the content of the Text property at the place where it is inserted in your page markup. A typical scenario is ensuring that a given user input control has a value entered. Here, all you need to do is add your input control and a RequiredFieldValidator next to it, set its ControlToValidate property to the ID of the associated input control, and set the Text property to say *. This will show an asterisk when no value is entered in the input control at the time of submitting the page. Using another validator is just as easy, except you need to customize different properties. Table 14-7 summarizes these main properties for each validator.
Table 14-7. The Main Customizable Validator Properties
Control Name
RequiredFieldValidator RangeValidator RegularExpressionValidator CompareValidator CustomValidator ValidationSummary
Main Properties
InitialValue MinimumValue, MaximumValue, Type ValidationExpression ControlToCompare, Operator, ValueToCompare, Type ClientValidationFunction, ServerValidate (event) DisplayMode, HeaderText, ValidationGroup
C H AP T ER 14 BUI LD I NG W EB AP P LIC AT IO NS
You may end up working with complex web pages that have many, even dozens, of input controls that belong to different forms on the page (for instance, a web page with a search form, a user registration form, and a contact form). By default, all validators defined on the page would be run and most likely prohibit your end user from moving onto the next page because of validation errors that are seemingly unrelated to the chosen action of the user. To solve this problem, you can turn to using validation groups, which specify a set of related controls and their validators. A validation group is formed by specifying a common group name (as a string) for the ValidationGroup property of each validator and the input control that triggers a page submission. This will ensure that only the validators that are related to the control initiating the page submission will be run. Finally, you can disable any validation by setting the CausesValidation property of a postback control to false.
Debugging, Profiling, and Tracing
Debugging ASP.NET applications is easy when using a tool such as Visual Studio. You can set breakpoints in your F# code, and these will allow you to break into the middle of code executing when server requests are performed. We discuss debugging techniques for regular F# code in 18. During development, it is often necessary to trace what happens on a page, as well as during the process of serving that page. You can enable page tracing by adding the Trace="true" page attribute to your web form. This will append information shown in Table 14-8 to the page displayed. Figure 14-3 shows an example of this information for the application from Listing 14-4.
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