Validation Server Controls
The CustomValidator control allows you to write a method to handle the validation of the value entered.
| Property | Description |
|---|---|
| BackColor | The background color of the CustomValidator control |
| ClientValidationFunction | Specifies the name of the client-side validation script function to be executed.
Note: The script must be in a language that the browser supports, such as VBScript or JScript
With VBScript, the function must be in the form: Sub FunctionName (source, arguments) With JScript, the function must be in the form: Function FunctionName (source, arguments) |
| ControlToValidate | The id of the control to validate |
| Display | The display behavior for the validation control. Legal values are:
|
| EnableClientScript | A Boolean value that specifies whether client-side validation is enabled or not |
| Enabled | A Boolean value that specifies whether the validation control is enabled or not |
| ErrorMessage | The 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 |
| ForeColor | The foreground color of the control |
| id | A unique id for the control |
| IsValid | A Boolean value that indicates whether the control specified by ControlToValidate is determined to be valid |
| OnServerValidate | Specifies the name of the server-side validation script function to be executed |
| runat | Specifies that the control is a server control. Must be set to "server" |
| Text | The message to display when validation fails |
CustomValidator
Declare two Label controls, one TextBox control, one Button control, and one CustomValidator control in an .aspx file. The
user() function checks the length of the input value. If the length is <8 or >16 the text "A username must be between 8 and 16 characters!"
will appear in the CustomValidator control.
Validation Server Controls
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