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Presentation transcript:

PART 2

25.3.2 AdRotator Control AdRotator control Randomly selects an image to display Generates a hyperlink to the Web page associated with that image Browsers that do not support images display alternate text that is specified in the XML document The browser loads the Web page associated with that image when a user clicks the image or substituted text

25.3.2 AdRotator Control (Cont.) Accesses an XML file to determine what advertisement image, hyperlink URL and alternate text to display and include in the page Create an XmlDataSource control to connect to the XML file ImageUrl Element Specifies the path (location) of the advertisement’s image NavigateUrl Element Specifies the URL for the Web page that loads when a user clicks the advertisement The URL cannot contain any whitespace AlternateText Element Contains text that displays in place of the image when the browser cannot locate or render the image Also a tooltip Impressions Element Specifies how often a particular image appears, relative to the other images

Defines an AdRotator control Outline FlagRotator.aspx (1 of 2) Defines an AdRotator control Defines an XmlDataSource control, which supplies the data to the AdRotator control

Outline FlagRotator.aspx (2 of 2)

Outline AdRotatorInforma tion.xml (1 of 4) Each Ad element represents an advertisement that will be displayed by the AdRotator control Specifies the path of the advertisement’s image Specifies the URL for the Web page that loads when user clicks on the advertisement Text that displays in place of the image when the browser cannot render the image Specifies how often a particular image appears

Outline AdRotatorInforma tion.xml (2 of 4)

Outline AdRotatorInforma tion.xml (3 of 4)

Outline AdRotatorInforma tion.xml (4 of 4)

25.3.3 Validation Controls Validation Control Determines whether the data in another Web control is in the proper format Provide a mechanism for validating user input on the client The validator is converted into JavaScript when the XHTML for the page is created Java Script is a scripting language that enhances the functionality and appearance of Web pages For security reasons, validation is always performed on the server

25.3.3 Validation Controls (Cont.) RequiredFieldValidator ControlToValidate property Indicates Validator verifies a control’s contents ErrorMessage Property Text displayed if the validation fails Display property Determines if the validator is displayed only when validation fails RegularExpressionValidator Matches a Web control’s content against a regular expression That expression is assigned to ValidationExpression property IsPostBack property Determines whether the page is being loaded due to a postback The current page reloads when the user submits the form

Outline Validation.aspx (1 of 5) Defines a RequiredFieldValidator which confirms the TextBox is not empty

Outline Defines a RequiredFieldValidator which confirms the TextBox is not empty Validation.aspx (2 of 5) Defines a RegularExpressionValidator control to determine whether data is entered in a valid format

Defines a RequiredFieldValidator which confirms the TextBox is not empty Outline Validation.aspx (3 of 5) Defines a RegularExpressionValidator control to determine whether data is entered in a valid format

Outline Validation.aspx (4 of 5)

Outline Validation.aspx (5 of 5)

Outline Determines whether the page is being loaded due to a postback Validation.aspx .vb Determines whether the page is being loaded due to a postback Retrieves the values of the TextBoxes