How can I show/hide component with JSF?
Generally, you need to get a handle to the control via its clientId. This example uses a JSF2 Facelets view with a request-scope binding to get a handle to the other control:
<?xml version='1.0' encoding='UTF-8' ?>
<!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:h="http://java.sun.com/jsf/html">
<h:head><title>Show/Hide</title></h:head>
<h:body>
<h:form>
<h:button value="toggle"
onclick="toggle('#{requestScope.foo.clientId}'); return false;" />
<h:inputText binding="#{requestScope.foo}" id="x" style="display: block" />
</h:form>
<script type="text/javascript">
function toggle(id) {
var element = document.getElementById(id);
if(element.style.display == 'block') {
element.style.display = 'none';
} else {
element.style.display = 'block'
}
}
</script>
</h:body>
</html>
Exactly how you do this will depend on the version of JSF you're working on. See this blog post for older JSF versions: JSF: working with component identifiers.
You should use <h:panelGroup ...>
tag with attribute rendered
. If you set true
to rendered, the content of <h:panelGroup ...>
won't be shown. Your XHTML file should have something like this:
<h:panelGroup rendered="#{userBean.showPassword}">
<h:outputText id="password" value="#{userBean.password}"/>
</h:panelGroup>
UserBean.java:
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
@ManagedBean
@SessionScoped
public class UserBean implements Serializable{
private boolean showPassword = false;
private String password = "";
public boolean isShowPassword(){
return showPassword;
}
public void setPassword(password){
this.password = password;
}
public String getPassword(){
return this.password;
}
}
You can actually accomplish this without JavaScript, using only JSF's rendered
attribute, by enclosing the elements to be shown/hidden in a component that can itself be re-rendered, such as a panelGroup, at least in JSF2. For example, the following JSF code shows or hides one or both of two dropdown lists depending on the value of a third. An AJAX event is used to update the display:
<h:selectOneMenu value="#{workflowProcEditBean.performedBy}">
<f:selectItem itemValue="O" itemLabel="Originator" />
<f:selectItem itemValue="R" itemLabel="Role" />
<f:selectItem itemValue="E" itemLabel="Employee" />
<f:ajax event="change" execute="@this" render="perfbyselection" />
</h:selectOneMenu>
<h:panelGroup id="perfbyselection">
<h:selectOneMenu id="performedbyroleid" value="#{workflowProcEditBean.performedByRoleID}"
rendered="#{workflowProcEditBean.performedBy eq 'R'}">
<f:selectItem itemLabel="- Choose One -" itemValue="" />
<f:selectItems value="#{workflowProcEditBean.roles}" />
</h:selectOneMenu>
<h:selectOneMenu id="performedbyempid" value="#{workflowProcEditBean.performedByEmpID}"
rendered="#{workflowProcEditBean.performedBy eq 'E'}">
<f:selectItem itemLabel="- Choose One -" itemValue="" />
<f:selectItems value="#{workflowProcEditBean.employees}" />
</h:selectOneMenu>
</h:panelGroup>
Use the "rendered" attribute available on most if not all tags in the h-namespace.
<h:outputText value="Hi George" rendered="#{Person.name == 'George'}" />