More About Validation-Control Tag Attributes
6.4.1 More About Validation-Control Tag Attributes
In addition to the attributes supported by all web controls, the validation controls recognize the following attributes within their respective tags: ControlToValidate Represents the name of the control to validate, as given by the controls ID property. Display Specifies whether visual space for the error message should be reserved on the web page, even if the message isnt currently being displayed. The possible values are: Dynamic Space for the error message is added to the page if validation fails. Static Space for the error message is added to the page, regardless of whether the message is actually displayed. This is the default. None The error message is never displayed, even if validation fails. This setting is used when the error message is displayed only in a validation summary control. EnableClientSideScript Specifies whether to enable client-side validation if supported by the browser. The default is True . ErrorMessage Provides the message displayed to the user if validation fails. The default is an empty string. ForeColor Defines the color in which the error message is displayed. The default is Red . Valid values for this attribute are given by the Color structure defined in the System.Drawing namespace. See Chapt er 4 for information about the Color structure. The CompareValidator control recognizes these additional attributes: ControlToCompare The name of the control that contains the value to compare. If this attribute is specified, the ValueToCompare attribute should not be specified. Operator The comparison to be performed. The possible values are: DataTypeCheck 276 Validation succeeds if the value in the control to validate can convert to the type specified by the Type attribute. Equal Validation succeeds if the value in the control to validate is equal to the comparison value. GreaterThan Validation succeeds if the value in the control to validate is greater than the comparison value. GreaterThanEqual Validation succeeds if the value in the control to validate is greater than or equal to the comparison value. LessThan Validation succeeds if the value in the control to validate is less than the comparison value. LessThanEqual Validation succeeds if the value in the control to validate is less than or equal to the comparison value. NotEqual Validation succeeds if the value in the control to validate is not equal to the comparison value. Type The data type of the values being compared. The values are converted to this type before the comparison is made. The possible values are Currency , Date , Double , Integer , and String . ValueToCompare The value to use for comparison. If this attribute is specified, the ControlToCompare attribute should not be specified. The CustomValidator control recognizes this additional attribute: ClientValidationFunction The name of the client-side script function to call to perform client-side validation. Server-side custom validation is performed by responding to the CustomValidator controls ServerValidate event. See Sect ion 6.4.4 later in this chapter for details. The RangeValidator control recognizes these additional attributes: MaximumValue The maximum value of the range. The default is an empty string. 277 MinimumValue The minimum value of the range. The default is an empty string. Type The data type of the value being validated. The value being validated, as well as the maximum and minimum values, are all converted to this type before the comparisons are made. The possible values are Currency , Date , Double , Integer , and String . The default is String . The RegularExpressionValidator control recognizes this additional attribute: ValidationExpression The regular expression against which to validate. The RequiredFieldValidator control recognizes this additional attribute: InitialValue The value considered a blank value. The default is an empty string. Validation fails if and only if the value in the control to be validated matches the value given in the InitialValue attribute.6.4.2 Using Validation-Control Properties
Parts
» VB.NET - (O'Reilly) Programming Visual Basic NET
» What Is the Microsoft .NET Framework?
» hello, world An Example Visual Basic .NET Program
» Hello, Windows An Example Visual Basic .NET Program
» Hello, Browser An Example Visual Basic .NET Program
» Source Files Identifiers The Visual Basic .NET Language
» Numeric Literals String Literals Character Literals
» Date Literals Boolean Literals Nothing Summary of Literal Formats
» Custom Types Collections Types
» The Namespace Statement The Imports Statement
» Symbolic Constants Scope The Visual Basic .NET Language
» Access Modifiers Assignment The Visual Basic .NET Language
» Unary Operators Arithmetic Operators
» Relational Operators Operators and Expressions
» String-Concatenation Operators Bitwise Operators
» Logical Operators Operator Precedence
» Call Exit Branching Statements
» Goto If RaiseEvent Branching Statements
» Return Select Case Branching Statements
» For Each Iteration Statements
» Object Instantiation and New Constructors
» Handling Events Inheritance Classes
» Passing arrays as parameters
» Variable-length parameter lists Main method
» Implementing interface methods Overriding inherited methods
» Overloading Overloading inherited methods
» The MyBase Keyword Nested Classes Destructors
» Interfaces The Visual Basic .NET Language
» Enumerations The Visual Basic .NET Language
» Exceptions The Visual Basic .NET Language
» Delegates The Visual Basic .NET Language
» Using Events and Delegates Together
» Creating Custom Attributes Attributes
» Standard Modules Conditional Compilation
» Summary The Visual Basic .NET Language
» Common Language Infrastructure CLI and Common Language Runtime CLR
» Global Assembly Cache GAC Comparison of Assemblies, Modules, and Namespaces
» Application Domains Common Language Specification CLS
» Intermediate Language IL and Just-In-Time JIT Compilation Metadata
» Finalize Memory Management and Garbage Collection
» Dispose Memory Management and Garbage Collection
» A Brief Tour of the .NET Framework Namespaces
» Configuration File Format Configuration
» Configuration Section Groups The appSettings Section
» Adding event handlers Creating a Form in Code
» Handling Form Events Windows Forms I: Developing Desktop Applications
» Relationships Between Forms Windows Forms I: Developing Desktop Applications
» Merging Menus MDI Applications
» Detecting MDI Child Window Activation
» Component Attributes Windows Forms I: Developing Desktop Applications
» The Graphics Class 2-D Graphics Programming with GDI+
» The Pen Class 2-D Graphics Programming with GDI+
» The Brush Class 2-D Graphics Programming with GDI+
» System colors The Color Structure
» Alpha Blending 2-D Graphics Programming with GDI+
» Antialiasing 2-D Graphics Programming with GDI+
» The PrintPageEventArgs Class Printing
» The OnBeginPrint and OnEndPrint Methods Choosing a Printer
» The PageSettings Class Printing
» The PrinterSettings Class Printing
» Page Setup Dialog Box Print Preview
» Summary Windows Forms I: Developing Desktop Applications
» The Button Class The CheckBox Class The ComboBox Class
» The DateTimePicker Class The GroupBox Class The ImageList Class
» The Label Class The LinkLabel Class
» The ListBox Class Common Controls and Components
» The ListBox.ObjectCollection Class
» The ListView Class Common Controls and Components
» The MonthCalendar Class Common Controls and Components
» The Panel Class The PictureBox Class
» The RadioButton Class Common Controls and Components
» The TextBox Class The Timer Class
» Other Controls and Components
» Control Events Windows Forms II: Controls, Common Dialog Boxes, and Menus
» The Anchor Property Form and Control Layout
» Controlling dock order The Dock Property
» The Splitter control The Dock Property
» ColorDialog FontDialog OpenFileDialog Common Dialog Boxes
» PageSetupDialog PrintDialog PrintPreviewDialog SaveFileDialog
» Adding Menus in the Visual Studio .NET Windows Forms Designer
» Programmatically Creating Menus Menus
» Building Controls from Other Controls
» Building Controls That Draw Themselves Building Nonrectangular Controls
» Summary Windows Forms II: Controls, Common Dialog Boxes, and Menus
» Setting control properties using attributes Adding event handlers
» AutoEventWireup Handling Page Events
» The Button control Web Controls
» The CheckBox control The DropDownList control
» The Image control The Label control
» The ListBox control Web Controls
» The RadioButton control Web Controls
» The Table control Web Controls
» The TextBox control Web Controls
» Other web controls Web Controls
» HTML Controls Handling Control Events
» Programmatically Instantiating Controls More About Server Controls
» More About Validation-Control Tag Attributes
» Using Validation-Control Properties Providing a Summary View of Validation Failures
» Performing Custom Validation Adding Validation
» Using Directives to Modify Web Page Compilation
» The Server Object ASP.NET Objects: Interacting with the Framework
» The Application Object The Session Object The Cache Object The Request Object
» The Response Object ASP.NET Objects: Interacting with the Framework
» Discovering Browser Capabilities ASP.NET and Web Forms: Developing Browser-Based Applications
» The Session Object Maintaining State
» The Application Object Maintaining State
» Session and Application Startup and Shutdown global.asax Compiles to a Class
» Adding Global Objects Application-Level Code and global.asax
» ASP.NET authorization Authorization
» Windows NTFS authorization Code-access authorization
» IUSR_ComputerName Impersonation Accessing Network Resources
» User Controls Designing Custom Controls
» Creating a custom server control using Visual Studio .NET
» Creating a custom server control in code Using a custom server control in Visual Studio .NET
» Summary ASP.NET and Web Forms: Developing Browser-Based Applications
» The WebService Attribute The WebMethod Attribute
» Testing a Web Service with a Browser
» Consuming a Web Service in Visual Studio .NET
» Consuming a Web Service in Notepad
» Synchronous Versus Asynchronous Calls
» Web-Service Descriptions Web-Service Discovery
» Limitations of Web Services Summary
» A Brief History of Universal Data Access Managed Providers
» Connecting to a SQL Server Database
» Connecting to an OLE DB Data Source
» The DataSet Class Finding Tables
» Finding Column Values Finding Column Definitions Changing, Adding, and Deleting Rows
» Writing Updates Back to the Data Source
» Relations Between DataTables in a DataSet
» The DataSets XML Capabilities
» Binding a DataSet to a Windows Forms DataGrid
» Binding a DataSet to a Web Forms DataGrid
» Typed DataSets ADO.NET: Developing Database Applications
» Reading Data Using a DataReader
Show more