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JSF Core Tag Library
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Selected f:validateLength
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12. JSF Core Tag Reference

Documentation > JSF > JSF Tag Reference > JSF Core Tag Library > f:validateLength

f:validateLength

The ValidateLength tag registers a LengthValidator instance on the component associated with the enclosing tag. This tag can be used to validate user input when the expected value is a string of a specific length.

JSF Example

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" 
      xmlns:f="http://java.sun.com/jsf/core" 
      xmlns:h="http://java.sun.com/jsf/html">
<h:head />
<body>
<h:form>
	<h:outputLabel value="Enter your password: " for="password" />
	<h:inputSecret label="Password" id="password" redisplay="true" 
	               value="#{userController.user.password}">
		<f:validateLength minimum="8" maximum="16" />
	</h:inputSecret>
	<h:commandButton value="Sign In" />
	<h:message for="password" errorStyle="color:red; display:block" />
</h:form>
</body>
</html>
This example was formatted by JSFToolbox for Dreamweaver.

Rendered Output

Rendered f:validateLength tag

Tag Attributes

binding Expression
 
The value-binding expression linking this component tag to a backing bean property.
disabled Boolean
 
The disabled attribute is a boolean flag that when set to true indicates that this component should not receive focus or be included in a form submit.
for Text
 
If present, this attribute refers to the value of one of the exposed attached objects within the composite component inside of which this tag is nested.
maximum Text
 
The maximum attribute sets the maximum value allowed for this component.
minimum Text
 
The minimum attribute sets the minimum length of text allowed for this component.