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CIS 375—Web App Dev II

CIS 375—Web App Dev II. ASP .NET 4 Server Controls. Limitations in Classic ASP. <html> <body bgcolor="yellow"> <center> <h2>Hello W3Schools!</h2> <p> <%Response.Write(now())%> </p> </center> </body> </html>

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CIS 375—Web App Dev II

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  1. CIS 375—Web App Dev II ASP .NET 4 Server Controls

  2. Limitations in Classic ASP <html> <body bgcolor="yellow"> <center> <h2>Hello W3Schools!</h2> <p> <%Response.Write(now())%> </p> </center> </body> </html> • A limitation in _______ ASP: The code block has to be placed where you want the output to appear. • With Classic ASP it is impossible to separate executable code from the ______ itself.

  3. Server Controls • ASP .NET has solved the “__________-code" problem described above with server controls. • Server controls are _____ that are understood by the server. • There are three kinds of server controls: • HTML Server Controls - Traditional HTML tags • _____ Server Controls - New ASP .NET tags • Validation Server Controls - For input validation

  4. HTML Server Controls 1 • HTML server controls are ______ tags understood by the server. • To make these elements a server control, add a runat="server" attribute to the HTML element. • The ___ attribute is added to identify the server control. • All HTML server controls must be within a _______ tag with the runat="server" attribute. • The Page_Load event is one of many events that ASP .NET understands.

  5. HTML Server Controls 2 • In the following example we declare an HtmlAnchor server control in an .aspx file. [Example] <script runat="server"> Sub Page_Load link1.HRef="http://www.w3schools.com" End Sub </script> <html> <body> <form runat="server"> <a id="link1" runat="server">Visit W3Schools!</a> </form> </body> </html>

  6. Web Server Controls • Web server controls are special ASP .NET tags understood by the server. [Example] <script runat="server"> Sub submit(Source As Object, e As EventArgs) button1.Text="You clicked me!" End Sub </script> <html> <body> <form runat="server"> <asp:Button id="button1" Text="Click me!" runat="server" OnClick="submit"/> </form> </body> </html>

  7. Validation Server Controls 1 • Validation server controls are used to validate user-input. • Each validation control performs a specific type of validation (like validating against a specific value or a range of values). • By default, page validation is performed when a Button, ImageButton, or LinkButton control is clicked. • You can prevent validation when a button control is clicked by setting the ________________ property to false.

  8. Validation Server Controls 2 [Example] <html> <body> <form runat="server"> Enter a number from 1 to 100: <asp:TextBox id="tbox1" runat="server" /> <br /><br /> <asp:Button Text="Submit" runat="server" /> <br /> <asp:RangeValidator ControlToValidate="tbox1" MinimumValue="1" MaximumValue="100" Type="Integer" EnableClientScript="false" Text="The value must be from 1 to 100!" runat="server" /> </form> </body> </html>

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