Beginning ASP.NET 4.5 in CSharp and VB Opsylum

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320 x CHAPTER 9 VALIDATING USER INPUT Because you can’t rely on these HTML5 attributes to validate your data, it’s important that you use the ASP.NET validation controls. The next section discusses the remaining validation controls that are available in ASP.NET. The Standard Validation Controls The five validation controls (the ones in the Validation category of the Toolbox whose names end in Validator) ultimately all inherit from the same base class, and thus share some common behavior. Four of the five validation controls operate in the same way, and contain built-in behavior that enables you to validate associated controls. The last control, the CustomValidator, enables you to write custom validation rules not supported out of the box. The following table lists a number of common properties that are shared by the validation controls and that you typically use when working with them. PROPERTY Display CssClass ErrorMessage Text ControlToValidate EnableClientScript SetFocusOnError DESCRIPTION This property determines whether or not the hidden error message takes up space. With the Display set to Static, the error message takes up screen real estate, even when it is hidden. This is similar to the CSS setting visibility: hidden you saw in earlier chapters. The Dynamic setting hides the error message using display: none until it needs to be displayed. With a setting of None, the control is not visible at all. This is useful if you are using a ValidationSummary, which you see later in this chapter. This property enables you to set the CSS class attribute that is applied to the error message text. This property holds the error message used in the ValidationSummary control. When the Text property is empty, the ErrorMessage value is also used as the text that appears on the page. The Text property is used as the text that the validation control displays on the page. This could be an asterisk (*) to indicate an error, or text like “Enter your name.” This property contains the server ID of the control that needs to be validated. This property determines whether the control provides validation at the client. The default is True. This property determines whether client-side script gives the focus to the first control that generated an error. This setting is False by default.
Gathering Data from the User x 321 PROPERTY ValidationGroup IsValid DESCRIPTION Validation controls can be grouped together, enabling you to perform validation against a selection of controls. All controls with the same ValidationGroup are checked at the same time, which means that controls that are not part of that group are not checked. Consider, for example, a login page with a Login button and fields for a username and password. The same page may also contain a search box that enables you to search the site. With the ValidationGroup, you can have the Login button validate the username and password boxes, whereas the Search button triggers validation for just the search box. You don’t typically set this property at design time, but at run time, it provides information about whether the validation test has passed. The Page class also has an IsValid property that returns the combined result of all controls in the page or validation group, as you’ll see later. The Difference between the Text and ErrorMessage Properties At first glance, these two properties seem to serve the same purpose. Both of them can be used to provide feedback to the user in the form of an error message. But when used in combination with a ValidationSummary control, there’s a subtle difference between the two. When you set both the properties at the same time, the validation control displays the Text property, whereas the ValidationSummary uses the ErrorMessage. Figure 9-5 shows a sample login page with two RequiredFieldValidator controls. Both validation controls have their Text property set to an asterisk (*) FIGURE 9-5 to give the user a visual cue that there is a problem. The ValidationSummary below the control then displays the full ErrorMessage properties. You’ve already seen the RequiredFieldValidator at work, so the next sections give you a good look at the three remaining standard validation controls. A later section then shows you how to use the CustomValidator and the ValidationSummary controls. RangeValidator The RangeValidator control enables you to check whether a value falls within a certain range. The control is able to check data types like strings, numbers, dates, and currencies. For example, you can use it to make sure a number is between 1 and 10, a character between A and F, or a selected date falls between today and the next two weeks. The following table lists its most important properties.
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BEGINNING ASP.NET 4.5 FOREWORD . .
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BEGINNING ASP.NET 4.5 IN C# AND VB
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—To Niek
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CREDITS Acquisitions Editor Mary Ja
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CONTENTS FOREWORD INTRODUCTION xxxi
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CONTENTS Working with Files in Your
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CONTENTS Not All Controls Rely on V
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CONTENTS Skins 245 Creating a Skin
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CONTENTS Providing Feedback to User
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CONTENTS Single Item Controls 455 P
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INTRODUCTION TO BUILD EFFECTIVE AND
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INTRODUCTION ‰ Chapter 4, “Work
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INTRODUCTION HOW THIS BOOK IS STRUC
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INTRODUCTION ‰ Code shown for the
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INTRODUCTION FIGURE I-2 The Site fo
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BEGINNING ASP.NET 4.5
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4Working with ASP.NET Server Contro
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Introduction to Server Controls x 1
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Introduction to Server Controls x 1
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A Closer Look at ASP.NET Server Con
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A Closer Look at ASP.NET Server Con
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Types of Controls x 117 FIGURE 4-4
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Types of Controls x 119 The Smart T
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Types of Controls x 121 } DropDownL
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Types of Controls x 123 Container C
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Types of Controls x 125 Note that t
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Types of Controls x 127 FIGURE 4-12
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Types of Controls x 129 FinishButto
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Types of Controls x 131 FileUpload
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Types of Controls x 133 Validation
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The ASP.NET State Engine x 135 serv
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The ASP.NET State Engine x 137 FIGU
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The ASP.NET State Engine x 139 4. A
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Practical Tips on Working with Cont
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Summary x 143 ⊲ WHAT YOU LEARNED
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6Creating Consistent Looking Websit
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Themes x 229 With this exported tem
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Themes x 231 Replace Theme with Sty
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Themes x 233 type="text/css" rel=
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Themes x 235 ASP.NET themes are not
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Themes x 237 FIGURE 6-19 How It Wor
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Themes x 239 VB.NET Dim myCookie As
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Themes x 241 FIGURE 6-21 Within the
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Themes x 243 C# preferredTheme.Valu
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Skins x 245 a cookie called Preferr
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Skins x 247 3. In the Extension box
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Practical Tips on Creating Consiste
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7Navigation WHAT YOU WILL LEARN IN
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Different Ways to Move Around Your
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Using the Navigation Controls x 257
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Mapping Your Data Model to an Objec
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Summary x 551 model. Combined with
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Formatting Your Controls Using Styl
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Handling Events x 563 background-im
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Handling Events x 567 The PreRender
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Caching x 589 In all the database e
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Caching x 593 Programmatic Caching
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Caching x 595 ‰ SummaryLabel ‰
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Caching x 597 } font-style: italic;
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Caching x 599 expiration date, whic
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17 Personalizing Websites WHAT YOU
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Understanding Profile x 645 In the
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BConfiguring SQL Server 2012 So far
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allowAnonymous attribute - ASP.NET
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text strings - types validation con
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