ASP.NET CompareValidator Control
 Complete Validation Control Reference
Definition and Usage
The CompareValidator control is used to compare the value of one input
control to the value of another input control or to a fixed value.
Note: If the input control is empty, the validation will succeed. Use
the RequiredFieldValidator control to make the field required.
Properties
| Property |
Description |
| BackColor |
The background color of the CompareValidator control |
| ControlToCompare |
The name of the control to compare with |
| ControlToValidate |
The id of the control to validate |
| Display |
The 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
|
| 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 |
| Operator |
The type of comparison to perform. The operators are:
- Equal
- GreaterThan
- GreaterThanEqual
- LessThan
- LessThanEqual
- NotEqual
- DataTypeCheck
|
| runat |
Specifies that the control is a server control. Must
be set to "server" |
| Text |
The message to display when validation fails |
| Type |
Specifies the data type of the values to compare. The types are:
- Currency
- Date
- Double
- Integer
- String
|
| ValueToCompare |
A specified value to compare with |
Examples
CompareValidator
In this example we declare two TextBox controls, one Button control, and one CompareValidator
control in an .aspx file. If
validation fails, the text "Validation Failed!" will be displayed in red on a
yellow background in the CompareValidator control.
CompareValidator 2
In this example we declare two TextBox controls, one ListBox control, one Button control, and
one CompareValidator control in an .aspx file. The check_operator() function sets
the operator of the CompareValidator control equal to the selected operator in
the ListBox control, then it validates the CompareValidator control. If
validation fails, the text "Validation Failed!" will be displayed in red on a
yellow background in the CompareValidator control.
Complete Validation Control Reference
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