ASP.NET RangeValidator Control

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Validation server control

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Definition and usage

RangeValidator control Used to detect whether the value entered by the user is between two values. Different types of values ​​can be compared, such as numbers, dates, and characters.

Note: If the input control is empty, validation will not fail. Use the RequiredFieldValidator control to make a field required (required).

Note: If the input value cannot be converted to the specified data type, validation will not fail. Use the CompareValidator control and set its Operator property to ValidationCompareOperator.DataTypeCheck to verify the data type of the input value.

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Properties

Properties	Description
BackColor	RangeValidator The background color of the control.
ControlToValidate	The id of the control to be validated.
Display	Verify the display behavior of the control. Legal values ​​are: None - the control is not displayed. Used only to display error messages in the ValidationSummary control. Static - If validation fails, the control displays an error message. Even if the input passes validation, space is reserved on the page to display the message, that is, the space used to display the message is allocated in advance. Dynamic - If validation fails, the control displays an error message. If the input passes validation, no space is reserved on the page to display the message, that is, the space used to display the message is added dynamically.
EnableClientScript	Boolean value, specifies whether to enable client verification.
Enabled	Boolean value, specifies whether to enable the validation control.
ErrorMessage	The text displayed in the ValidationSummary control when validation fails. Note: If the Text property is not set, the text will also be displayed in the validation control.
ForeColor	The foreground color of the control.
id	The unique id of the control.
IsValid	Boolean value indicating whether the control specified by ControlToValidate passed validation.
MaximumValue	Specifies the maximum value of the input control.
MinimumValue	Specifies the minimum value of the input control.
runat	Specifies that the control is a server control. Must be set to "server".
Type	Specifies the data type of the value to be detected. Types are: Currency Date Double Integer String
Text	The message displayed when verification fails.

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Example

RangeValidator
In this example, we declare a TextBox control, a Button control, and a RangeValidator control in the .aspx file. If validation fails, the text "The date must be between 1/1/2002 and 31/5/2002!" is displayed in the RangeValidator control.

RangeValidator 2
In this example, we declare a TextBox control, a Button control, a Label control, and a RangeValidator control in the .aspx file. The submit() function can detect whether the page is valid. If valid, returns "The page is valid!" in the Label control. If it is invalid, "The page is not valid!" is returned in the Label control. If validation fails, "The value must be from 1 to 100!" is displayed in the RangeValidator control.

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Validation Server Control