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HTML Controls->ASP.NET HtmlInputRadioButton Control

2007-03-26 15:29 471 查看

Definition and Usage

The HtmlInputRadioButton control is used to control an <input type="radio"> element. In HTML, this element is used to create a radiobutton.

Properties

Property	Description
Attributes	Returns all attribute name and value pairs of the element
Checked	A Boolean value that specifies whether or not the element is to be selected
Disabled	A Boolean value that indicates whether or not the control should be disabled. Default is false
id	A unique id for the element
Name	The name of the radio button group
runat	Specifies that the element is a server control. Must be set to "server"
Style	Sets or returns the CSS properties that are applied to the control
TagName	Returns the element tag name
Type	The type of the element
Value	The value of the element
Visible	A Boolean value that indicates whether or not the control should be visible

Examples

HTMLInputRadiobutton
ASPX Source:

<script runat="server">
Sub submit(Source As Object, e As EventArgs)
if r1.Checked=True then
p1.InnerHtml="Your favorite color is red"
else
if r2.Checked=True then
p1.InnerHtml="Your favorite color is green"
else
if r3.Checked=True then
p1.InnerHtml="Your favorite color is blue"
end if
end if
end if
End Sub
</script>

<html>
<body>

<form runat="server">
<p>Select your favorite color:
<br />
<input id="r1" name="col" type="radio" runat="server">Red</input>
<br />
<input id="r2" name="col" type="radio" runat="server">Green</input>
<br />
<input id="r3" name="col" type="radio" runat="server">Blue</input>
<br />
<input type="button" value="Submit" OnServerClick="submit" runat="server"/>
<p id="p1" runat="server" />
</form>

</body>
</html>

Output Result:

Select your favorite color:
Red
Green
Blue

IF you click the radiobox "Green", it will shows :

Select your favorite color:
Red
Green
Blue

Your favorite color is green

In this example we declare three HtmlInputRadioButton controls, one HtmlInputButton control, and one HtmlGeneric control in an .aspx file (remember to embed the controls inside an HtmlForm control). When the submit button is triggered, the submit subroutine is executed. The submit subroutine may respond in three ways: if the radiobutton with id="r1" is selected, the server sends the message "Your favorite color is red" to the p element. If the radiobutton with id="r2" is selected, the server sends the message "Your favorite color is green" to the p element. If the radiobutton with id="r3" is selected, the server sends the message "Your favorite color is blue" to the p element.

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