ASP.NET Server Controls Guide
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This document discusses different types of server controls in ASP.NET including ASP.NET Web Server Controls, HTML Server Controls, and creating server controls dynamically. It provides examples of common controls like textboxes, buttons, dropdown lists and describes how controls can be referenced and handled via server-side code behind files using properties and events. Validation controls are also mentioned.
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ASP.NET Server Controls Guide
- 1. Types of Server Controls ASP.NET Web Server Controls HTML Server Controls Creating Server Controls Dynamically
- 2. With ASP. Net, these are any controls that run in the server space. o Handled by ASP. Net runtime o Must have runt=“server” attribute within the ASP. Net web form o Always identified with the “ID” attribute (also mandatory with ASP. Net web controls) Properties, events, etc. can all be handled by server-side code
- 3. • Label • Textbox • Button • Link • Link Button • Dropdown List • List Box • Checkbox • Radio Button • Image • File Upload • Panel • <span /> • <input type=“text” /> • <input type=“submit” /> • <a href=[#|page] /> • <a href=[postback] /> • <select /> • <select [size=x] /> • <input type=“checkbox” /> • <input type=“radio” /> • <img /> • <input type=“file” /> • <div />
- 4. • Like the ASP. Net Page object (System.Web.UI.Page), web controls maintain the same event processing – Init, PreRender, Load, etc • If AutoPostBack is set on the control, the event will be fired immediately (causes an automatic postback), otherwise, the event will fire upon next page postback • Checkbox – Check Changed() • Button – Click(), Command() • Dropdown List – Text Changed(), SelectedIndexChanged()
- 5. • System.Web.UI.HtmlControls – Ex: HtmlButton, HtmlTable, HtmlInputText • These are ASP. Net HTML server controls – Rendered as: – <button />, <table />, <input type=“text” />
- 6. • The HtmlControls collection allows the programmer access to HTML elements (and their properties, etc.) from server-side code – Hence, page content (HTML elements) can also be dynamically generated in the code behind or classes • All controls in this collection inherit from the HtmlControl class
- 7. • HtmlAnchor • HtmlButton • HtmlInputButton • HtmlInputHidden • HtmlInputText • HtmlImage • HtmlSelect • HtmlTable • HtmlTextArea • HtmlGenericControl <a /> <button /> <input type=“button” /> <input type=“hidden” /> <input type=“text” /> <img /> <select /> <table /> <text area /> <span />, <body />, <h1 />, <div />…
- 8. • Properties and Events can be managed efficiently in the code behind • Any server control can be referenced by its ID property Example: txtTextBox.Text = “Hello!”;
- 9. • Code is written by the event handler that is defined by the control – <asp: Button On Click=“bttnGo_Click”... /> bttnGo_Click(object sender, …) { … } • This is the key to maintaining clean, efficient code for processing form data and UI interaction
- 10. • It is good practice to prefix the name of control ID to text that indicates its “Type” o Textbox txtName o Checkbox chkCorrect o Dropdown List ddlProductTypes o Panel pnlCustInfo • This will make it easier when referring to the controls at runtime in code
- 11. • Data – GridView – DataList – SqlDataSource – etc. • Validation (server-side) – RequiredFieldValidator – RangeValidator – RegularExpressionValidator • Navigation – SiteMapPath – Menu – TreeView – etc. • Login – Login – LoginView – etc.
- 12. • Everything in VB/C# is an object, therefore ASP. Net server controls are objects as well • Controls can be dynamically created using server side code (VB/C#)
- 13. Control Name Properties RequiredFieldValidator CompareValidator RangeValidator RegularExpressionValidator CustomValidator ValidationSummary ControlToValidate, Display , ErrorMessage,ValidationGroup, ControlToCompare, MaximumValue,MinimumValue Validation Expression Text,ClientValidationFunction, OnServerValidate Header Text