Use f:setPropertyActionListener to pass a object from JSF page to your backend. This tag is especially useful when you are using repeatable components like datatable
No need to use raw JavaScript, you can use <f:ajax />. Plus instead of worrying about Car id and all, just send it completely to backing bean.
Here is a sample example:
The Car class:
public class Car {
int id;
String brand;
String color;
public Car(int id, String brand, String color) {
this.id = id;
this.brand = brand;
this.color = color;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public String getBrand() {
return brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
}
The CarTree class:
import java.util.ArrayList;
import java.util.List;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
@ManagedBean(name = "CarTree")
@RequestScoped
public class CarTree {
List<Car> carList;
Car selectedCar;
public Car getSelectedCar() {
return selectedCar;
}
public void setSelectedCar(Car selectedCar) {
this.selectedCar = selectedCar;
}
public List<Car> getCars() {
return carList;
}
public void setCars(List<Car> carList) {
this.carList = carList;
}
public CarTree() {
carList = new ArrayList<Car>();
carList.add(new Car(1, "jaguar", "grey"));
carList.add(new Car(2, "ferari", "red"));
carList.add(new Car(3, "camri", "steel"));
}
}
The JSF page:
<?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"
xmlns:f="http://java.sun.com/jsf/core">
<h:head>
<title>Facelet Title</title>
</h:head>
<h:body id="mainBody">
<h:form id="carForm">
<h:dataTable value="#{CarTree.cars}" var="car">
<h:column>
<h:outputText value="#{car.id}"/>
</h:column>
<h:column>
<h:outputText value="#{car.brand}"/>
</h:column>
<h:column>
<h:outputText value="#{car.color}"/>
</h:column>
<h:column>
<h:commandButton value="Show Car Detail" >
<f:setPropertyActionListener target="#{CarTree.selectedCar}" value="#{car}"/>
<f:ajax render=":carForm:carDetails" />
</h:commandButton>
</h:column>
</h:dataTable>
<h:panelGroup id="carDetails" layout="block" style="float:left;">
<h:outputText value="#{CarTree.selectedCar.id}" />
<h:outputText value="#{CarTree.selectedCar.brand}" />
<h:outputText value="#{CarTree.selectedCar.color}" />
</h:panelGroup>
</h:form>
</h:body>
</html>
Hope this helps.
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