JSF <f:validateRequired> Tag
It is used to ensure that the local value is not empty on an EditableValueHolder component.
# Tag Attributes
| Attribute | Description |
|---|---|
| binding | It is used to bind a ValueExpression that evaluates to an instance of RequiredValidator. |
| for | This attribute is used to refers to the value of one of the exposed attached objects within the composite component inside of which this tag is nested. |
| id | It is a unique component identifier. |
| class | It is used to represent CSS class. |
# JSF <f:validateRequired> Tag Example
// index.xhtml
<h:form id="form">
<h:outputLabel for="username">User Name</h:outputLabel>
<h:inputText id="name-id" value="#{user.name}" validatorMessage="User name is required">
<f:validateRequired />
</h:inputText><br/>
<h:commandButton value="OK" action="response.xhtml"></h:commandButton>
</h:form>
// User.java
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
@ManagedBean
@RequestScoped
public class User{
String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
