Transcript wk-4-1
Welcome to week – 4-1 of… Web Development Using ASP .NET CA – 240 Kashif Jalal Standard Controls AdRotator • AdRotator: The AdRotator Web server control reads advertisement (ad) information from a data source, which one or more ad records. You can store ad information in an XML file and then bind the AdRotator control to the file. • The AdRotator control selects ads randomly, changing the displayed ad each time the page is refreshed. Ads can be weighted to control the priority level of banners, making it possible to have certain ads display more often than others. You can also write custom logic that cycles through the ads. BulletedList • BulletedList: The BulletedList control can display static text in a list that is either unordered (bulleted) or ordered (numbered). Buttons Web server controls make it easy for you to add different types of buttons to your Web Forms page. There are three types of button Web-server controls: Button, LinkButton, and ImageButton each of which appears differently on Web pages . Using ASP.NET button Web server controls on ASP.NET Web pages allows users to indicate that they have completed the form or that they want to perform a specific command. Buttons • LinkButton: Displays a hyperlink-style button control on a Web page. Renders as a hyperlink in the page. However, it contains client-side script that causes the form to be posted back to the server. (You can create a true hyperlink by using the HyperLink Web server control.) • ImageButton Allows you to specify a graphic as a button. This is useful for presenting a rich button appearance. The ImageButton controls also pinpoint where in the graphic a user has clicked, which allows you to use the button as an image map. Calendar The Calendar control establishes a default look for the calendar on the page, but you can change the calendar's overall appearance. If you set appearance properties for individual calendar elements, such as today's date, the selected date, and so on, the individual settings are based on the default settings you make for the calendar as a whole. You can also select from predefined formats. CheckBox You add individual CheckBox controls to a page and work with them singly. Alternatively, the CheckBoxList control is a single control that acts as a parent control for a collection of check-box list items. It derives from a base ListControl class, and therefore works much like the ListBox, DropDownList, RadioButtonList, and BulletedList Web server controls. For that reason, many of the procedures for working with the CheckBoxList control are the same as the procedures for the other list Web server controls. DropDownList The DropDownList Web server control allows users to select an item from a predefined list. It differs from the ListBox Web server control in that the list of items remains hidden until users click the drop-down button. In addition, the DropDownList control differs from the ListBox control in that it does not support multi-selection mode. FileUpload The FileUpload Web server control allows you to provide users with a way to send a file from their computer to the server. The file to be uploaded is submitted to the server as part of the browser request during postback. After the file has completed uploading, you can manage the file in your code. Hyperlink You can add a hyperlink to your Web Forms page by placing a HyperLink Web server control on the page and associating it with a URL. You can specify that HyperLink controls render as either text or as graphics. Image The Image Web server control allows you to display images on an ASP.NET Web page and manage these images in your own code. Unlike most other Web server controls, the Image control does not support any events. For example, the Image control does not respond to mouse clicks. Instead, you can create an interactive image by using the ImageMap or the ImageButton Web server controls. ImageButton - ImageMap • When users click an ImageButton control, a parameter passed to the event handler for the control's Click event includes the coordinates indicating where the user clicked. This allows you to perform different tasks based on where the user clicked. • ImageMap: Creates a control that displays an image on a page. When a hot spot region defined within the ImageMap control is clicked, the control either generates a postback to the server or navigates to a specified URL. • An ImageMap control creates a graphic with hotspots that users can click individually. Creating an ImageMap control consists of creating the control, specifying the image, and then separately defining the hotspots. Label • If you want to display static text, you can present it by using HTML — you do not need a Label control. Use a Label control only when you need to change the contents or appearance of text programmatically. • The Label control provides one way to display text in an ASP.NET Web page. Other options include the HTML and Literal control. ListBox The ListBox Web server control allows users to select one or more items from a predefined list. It differs from a DropDownList control in that it can display multiple items at once and it optionally allows the user to select multiple items. Literal You can add a Literal Web server control to your Web Forms page when you want to set text programmatically without adding extra HTML tags. The Literal control is useful as a way to add text into a page dynamically without adding any elements that are not part of the dynamic text. For example, you can use the Literal control to display HTML that you read from a file or from a stream. MultiView - View The MultiView and View Web server controls act as containers for other controls and markup, and provide a way for you to display alternative sets of controls and markup. The MultiView and View controls were designed primarily for use with browsers on mobile devices, but they are supported in any ASP.NET page.