Asp.NET Core Server Controls - Web Programming - Lecture Slides, Slides of Computer Programming

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Asp.NET Core Server

Controls

Lecture Overview

 Understanding the types of ASP.NET controls  HTML controls  ASP.NET (Web) controls

Categorizing Server Controls

ASP.NET CONTROLS

HTML CONTROLS WEB CONTROLS

Categorizing Server Controls

 HTML controls  always map to HTML tags  All attributes are strictly compatible with XHTML  They allow you to perform ‘some’ server side processing  Web Controls (ASP.NET server controls)  Are implemented by the ASP server as .NET Framework classes having a common .NET programming interface

HTML Controls

(Example )

 A **** tag can be designated runat=“server”  The Header property maps to the HTML **** tag

 ****

HTML Controls

(Example )

 Store a value in the page header

protected void Page_Load(object sender, EventArgs e) { Header.Title = "IS 460 HTML Control Demo " + System.DateTime.Now.ToString(); }

HTML Controls

 The HTMLAnchor class implements **** tags  **** tags designated runat=“server” and having an id will be seen by the server

ASP.NET Server Controls

 These are unique to ASP.NET  All are contained in the System.Web.UI.WebControls namespace  All derive from WebControl  runat=“server” attribute is required or the markup will be rendered verbatim  They are not the same as HTML controls  The programming interface is more intuitive

ASP.Net Server Controls

(Properties 2)

 The Style property contains references a collection of CSS style MyControlStyle[“border-color”] = blue;

 The CssClass contains the name of a defined CSS class  txtStyleDemo1.CssClass = "TextBox"

ASP.NET Server Controls

(Methods)

 Focus – sets input focus to the control instance when it is rendered  HasControls – denotes whether this control instance has child controls  Controls – a collection of child controls  DataBind – binds the control instance to a data source

Other Control Characteristics

 Adaptive rendering allows controls to render differently based on the browser  Control properties can be declared for different browsers, as follows:

Control State (Introduction)

 State information must often be persisted across page requests  Control state is like view state  You generally don’t mess with the control state

Button Controls

(Introduction)

 CausesValidation determines whether a validation is performed when the button is clicked. ValidationGroup also controls validation  More next time  Text contains the text that appears in the button  Visible property displays or hides the button

Other Controls

 The Panel control acts as a container for other controls  The View control creates a group of interchangeable panels