In JSF 2.3, <h:dataTable/> and <ui:repeat /> support Iterable and Map.
Iterable example
Let's create a simple demo to try it.
The backing bean.
@Model
public class IterableBean {
@Inject Logger LOG;
private Iterable data = Arrays.asList("javaee 8", "jsf 2.3");
public Iterable getData() {
LOG.log(Level.INFO, "called IterableBean.getData");
return data;
}
}
And the facelets template.
<!DOCTYPE html>
<html lang="en"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
xmlns:f="http://xmlns.jcp.org/jsf/core"
xmlns:h="http://xmlns.jcp.org/jsf/html"
>
<f:view>
<h:head>
<title>JSF 2.3: DataModel Sample</title>
</h:head>
<h:body>
<h1>JSF 2.3: Iterable interface Sample</h1>
<h2> h:dataTable Iterable interface</h2>
<h:dataTable var="entry" value="#{iterableBean.data}">
<h:column>#{entry}</h:column>
</h:dataTable>
<h2> ui:repeat Iterable interface</h2>
<ui:repeat var="item" value="#{iterableBean.data}">
Item: #{item}
</ui:repeat>
</h:body>
</f:view>
</html>
Map example
The backing bean.
@Model
public class MapBean {
@Inject
Logger LOG;
private Map<Integer, String> data = new HashMap<>();
public Map<Integer, String> getData() {
LOG.log(Level.INFO, "called MapBean.getData");
data.put(1, "java ee 8");
data.put(2, "jsf 2.3");
return data;
}
}
And the facelets template.
<!DOCTYPE html>
<html lang="en"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
xmlns:f="http://xmlns.jcp.org/jsf/core"
xmlns:h="http://xmlns.jcp.org/jsf/html"
>
<f:view>
<h:head>
<title>JSF 2.3: DataModel Sample</title>
</h:head>
<h:body>
<h1>JSF 2.3:Map interface Sample</h1>
<h2> UIRepeat: Map interface</h2>
<ui:repeat var="entry" value="#{mapBean.data}">
Key: #{entry.key}
Value: #{entry.value}
</ui:repeat>
<h2>DataTable: Map Interface</h2>
<h:dataTable var="entry" value="#{mapBean.data}">
<h:column>#{entry.key}</h:column>
<h:column>#{entry.value}</h:column>
</h:dataTable>
</h:body>
</f:view>
</html>
Iteration without backing data
In former versions, when you want to iterate a number collection from 0 to 10, you have to use c:forEach which from legacy JSP taglibs.
Now the new ui:repeat added this feature finally.
<ui:repeat begin="0" end="10" step="2" var="i">
#{i}<br />
</ui:repeat>
Custom DataModel
JSF 2.3 provides a new @FacesDataModel to simplify the customization of your own DataModel.
The backing bean.
@Model
public class CustomBean {
@Inject
Logger LOG;
public UserData getUserData() {
LOG.log(Level.INFO, "called CustomBean.getUserData");
List<User> data = IntStream.of(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
.mapToObj(i -> new User("first " + i, "last " + i))
.collect(Collectors.toList());
return new UserData(data);
}
}
UserData is just a POJO which wraps a list of User.
public class UserData {
List<User> users = new ArrayList<>();
public UserData() {
}
public UserData(List<User> users) {
this.users = users;
}
public List<User> getUsers() {
return users;
}
public void setUsers(List<User> users) {
this.users = users;
}
}
public class User implements Serializable {
private String firstName;
private String lastName;
public User(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
@Override
public String toString() {
return "User{" + "firstName=" + firstName + ", lastName=" + lastName + '}';
}
}
The facelets template.
<ui:repeat value="#{customBean.userData}" var="item">
User : #{item}<br />
</ui:repeat>
We use UserData as UIRepeat backing data, it is not supported in JSF by default. Let's fill the gap via custom @FacesDataModel class.
@FacesDataModel(forClass = UserData.class)
public class UserDataModel extends DataModel<User> {
UserData data = null;
int index = 0;
public UserDataModel() {
this(null);
}
public UserDataModel(UserData data) {
this.data = data;
}
@Override
public boolean isRowAvailable() {
return this.index >= 0 && this.index < this.getRowCount();
}
@Override
public int getRowCount() {
return this.data != null ? this.data.getUsers().size() : 0;
}
@Override
public User getRowData() {
if (this.index >= 0 && this.index < this.getRowCount()) {
return this.data.getUsers().get(this.index);
}
return null;
}
@Override
public int getRowIndex() {
return this.index;
}
@Override
public void setRowIndex(int rowIndex) {
this.index = rowIndex;
}
@Override
public Object getWrappedData() {
return this.data;
}
@Override
public void setWrappedData(Object data) {
this.data = (UserData) data;
}
}
