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Validation Server Controls->ASP.NET RegularExpressionValidator Control

2007-03-29 15:22 531 查看

Definition and Usage

The RegularExpressionValidator control is used to ensure that an input value matches a specified pattern.

Note: Both server- and client-side validation are performed unless the browser does not support client-side validation or the EnableClientScript property is set to false.

Note: The validation will not fail if the input control is empty. Use the RequiredFieldValidator control to make the field required.

Properties

PropertyDescription
BackColorThe background color of the RegularExpressionValidator control
ControlToValidateThe id of the control to validate
DisplayThe display behavior for the validation control. Legal values are:

None (the control is not displayed. Used to show the error message only in the ValidationSummary control)
Static (the control displays an error message if validation fails. Space is reserved on the page for the message even if the input passes validation.
Dynamic (the control displays an error message if validation fails. Space is not reserved on the page for the message if the input passes validation

EnableClientScriptA Boolean value that specifies whether client-side validation is enabled or not
EnabledA Boolean value that specifies whether the validation control is enabled or not
ErrorMessageThe text to display in the ValidationSummary control when validation fails. Note: This text will also be displayed in the validation control if the Text property is not set
ForeColorThe foreground color of the control
idA unique id for the control
IsValidA Boolean value that indicates whether the control specified by ControlToValidate is determined to be valid
runatSpecifies that the control is a server control. Must be set to "server"
BackColorThe background color of the RegularExpressionValidator control
TextThe message to display when validation fails
ValidationExpressionSpecifies the expression used to validate input control. The expression validation syntax is different on the client than on the server. JScript is used on the client. On the server, the language you have specified is used

Examples

RegularExpressionValidator
ASPX Source:

<script runat="server">
sub submit(sender As Object, e As EventArgs)
if Page.IsValid then
lbl.Text="The page is valid!"
else
lbl.Text="The page is not valid!"
end if
end sub
</script>

<html>
<body>

<form runat="server">
Enter a US zip code:
<asp:TextBox id="txtbox1" runat="server" />
<br /><br />
<asp:Button text="Submit" OnClick="submit" runat="server" />
<br /><br />
<asp:Label id="lbl" runat="server" />
<br />
<asp:RegularExpressionValidator
ControlToValidate="txtbox1"
ValidationExpression="\d{5}"
EnableClientScript="false"
ErrorMessage="The zip code must be 5 numeric digits!"
runat="server" />
</form>

</body>
</html>

Output Result:

Enter a US zip code:


IF you enter a US zip code "215300" and the click the button "Submit",,it will show:

Enter a US zip code:

The page is not valid!
The zip code must be 5 numeric digits!

IF you enter a US zip code "21530" and the click the button "Submit",it will show:

Enter a US zip code:

The page is valid!

In this example we declare one TextBox control, one Button control, one Label control, and one RegularExpressionValidator control in an .aspx file. The submit() function checks if the page is valid. If it is valid, it returns "The page is valid!" in the Label control. If it is not valid, it returns "The page is not valid!" in the Label control. If validation fails, the text "The zip code must be 5 numeric digits!" will be displayed in the RegularExpressionValidator control.
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