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ASP.NET DropDownList control

Web Server Controls Web server control

Definition and Usage

DropDownList control is used to create a drop-down list.

DropDownList control each option is defined by a ListItem element!

Note: The control supports data binding!


Attributes

属性 描述 .NET
SelectedIndex 可选项的索引号 1.0
OnSelectedIndexChanged 当被选项目的 index 被更改时被执行的函数的名称。 1.0
runat 规定该控件是服务器控件。必须设置为 "server"。 1.0

ListControl standard attributes

AppendDataBoundItems, AutoPostBack, CausesValidation, DataTextField, DataTextFormatString, DataValueField, Items, runat, SelectedIndex, SelectedItem, SelectedValue, TagKey, Text, ValidationGroup, OnSelectedIndexChanged

ListControl control covers all the basic functions of a list control. Controls inherit from this control include: CheckBoxList, DropDownList, ListBox and RadioButtonList control.

For a full description, visit the ListControl standard attributes .

Web Control Standard Properties

AccessKey, Attributes, BackColor, BorderColor, BorderStyle, BorderWidth, CssClass, Enabled, Font, EnableTheming, ForeColor, Height, IsEnabled, SkinID, Style, TabIndex, ToolTip, Width

For a full description, visit the Web Control Standard Attributes .

Control Standard Properties

AppRelativeTemplateSourceDirectory, BindingContainer, ClientID, Controls, EnableTheming, EnableViewState, ID, NamingContainer, Page, Parent, Site, TemplateControl, TemplateSourceDirectory, UniqueID, Visible

For a full description, go to Control Standard Attributes .


Examples

DropdownList
In this example, we declare a DropDownList control in an .aspx file. And then create an event handler, display text and selected item in the Label control when the Click event occurs.


Web Server Controls Web server control