Input text returning null value - jsf-2

Question

This might be simple problem, but I am not able to figure it out.
Here is my xhtml page:
*update p tag here, I am using primefaces*
<h:outputLabel for="Number" value="Number(100-800):" />
<h:inputText id="number" name="number_Name" value="#{validationView.number}" label="Number">
<f:validateDoubleRange minimum="100" maximum="800" />
</h:inputText>
<p:commandButton value="S-ubmit" name="submit" actionListener="#{userBean1.method1}" ajax="false" icon="ui-icon-check" validateClient="true"/>
This is my managed bean
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import org.primefaces.context.RequestContext;
#ManagedBean(name="userBean1")
#SessionScoped
public class UserBean1
{
public void method(){
String value = FacesContext.getCurrentInstance().
getExternalContext().getRequestParameterMap().get("number_Name");
System.out.println("Value: "+value);
}
public void method1(ActionEvent event) {
String param = (String) event.getComponent().getAttributes().get("number_Name");
System.out.println("Param: "+param);
}
}
I tried both methods and in both cases it is printing null output. I imported el-impl-2,2.jar into my build path. I am using primefaces 5.1 and Tomcat7

Answer 1

First, there is no attribute called name in h:inputText, if you really need to use that attribute, please refer to that question for more details: How to specify name attribute in h:inputText?
So I will assume your h:inputText looks something like this:
<h:inputText id="number" value="#{validationView.number}" label="Number">
<f:validateDoubleRange minimum="100" maximum="800" />
</h:inputText>
Second, in the externalContext().getRequestParameterMap().get(key) the key refers to the request parameters names included in the current request, which corresponds to the client ID (because name is autogenerated by JSF based on the client ID), so if for example your h:inputText is inside a form whose id= "form" then your client ID will be "form:number", More about When and how is clientID generated in JSF?
You can use your first method like this:
public void method(){
String value = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("form:number");
System.out.println("Value: "+value);
}
In case you only know the component id of your h:inputText and not it's client ID please refer to: Find component by ID in JSF
Finnaly, I think that the best way is to use the following method which make you benefit from the ActionEvent:
public void method(ActionEvent event) {
String param = (String) ((UIInput) event.getComponent().findComponent("form:number")).getValue();
System.out.println("Param: "+param);
}
NB: please note that event.getComponent() gets the component that triggered the event which is p:commandButton (in your case) and not the h:inputText