I have two components, one commandButton and a selectOneListbox.
I need to update the value of the backing property binded to selectOneListBox after I click on the commandButton.
Both components are inside the same <h:form>.
The backing Bean is a Named/SessionScoped bean.
Here is the part of my page where the components are defined:
Button:
<h:commandButton formnovalidate="formnovalidate" title="Select Variable"
type="button" styleClass="button_green close_window"
tabindex="2" id="btnSelectVar" value="Confirm">
<f:ajax execute="lstVarSelected" event="click"
listener="#{systemOptionsControl.updateText}" onevent="updateParent"/>
</h:commandButton>
SelectOneListBox: (selectedVariable is a String and variables is a List of String)
<h:selectOneListbox id="lstVarSelected" name="lstVarSelected"
tabindex="1" value="#{systemOptionsControl.selectedVariable}" >
<f:selectItems value="#{systemOptionsControl.variables}"/>
</h:selectOneListbox>
After I click on button, I need to get the backing propert of the oneListBox, but JSF isnt calling the set method on backing bean. Then, when I try to get the value on my updateText method, i got a NullPointerException.
I’ve trie a lot of solutions and none worked, anyone can give any ideas?
Here is the xhtml:
<!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:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:escriba="http://java.sun.com/jsf/composite/components/escriba"
xmlns:f="http://java.sun.com/jsf/core" lang="pt-br" class="no-js">
<body>
<h:head>
<h:outputScript name="jsf.js" library="javax.faces"/>
<script language="javascript">
function callParentButton(data) {
//Verifica o status da execução do ajax.
var status = data.status;
//alert(status);
switch(status)
{
case 'begin':
break;
case 'complete':
//Gets the name of parent button
var a = #{systemOptionsControl.idBtnAtualizarTextAreas};
//Calls the click.
var btn = document.getElementById(a.valueOf().name);
btn.click();
break;
}
}
</script>
</h:head>
<h:form prependId="false" id="frmVariables">
<section class="box_padrao">
<header id="box_padrao_header">
<h1>System Options</h1>
<div id="actions_menu">
<h:commandButton type="button" title="Select Variable" styleClass="button_green" tabindex="2"
id="btnConfirmar" value="Confirm">
<f:ajax execute="lstVariables" event="click" listener="systemOptionsControl.updateText" onevent="callParentButton"/>
</h:commandButton>
<button type="button" title="Cancel" class="button_red close_window" tabindex="3" id="btnCancelar" name="btnCancel">Cancel</button>
</div>
</header>
<div class="box_padrao_content">
<div class="grid_100">
<h2 class="legend">» Variables List </h2>
<fieldset class="fieldset">
<div class="grid_100">
<h:selectOneListbox id="lstVariables" name="lstVariables" tabindex="1" value="#{systemOptionsControl.selectedVariable}" >
<f:selectItems value="#{systemOptionsControl.variables}"/>
</h:selectOneListbox>
</div>
</fieldset>
</div>
</div>
</section>
</h:form>
</body>
</html>
And here is the Bean:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package br.com.xxx.rodrigoms.control;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.enterprise.context.SessionScoped;
import javax.inject.Named;
/**
*
* @author rodrigos
*/
@Named
@SessionScoped
public class SystemOptionsControl{
private String selectedVariable;
@PostConstruct
public void initialize() {
//non-matter code
}
//<editor-fold desc="GETS/SETS">
public String getIdBtnAtualizarTextAreas(){
return "btnUpdateTextAreas";
}
public String getSelectedVariable() {
return selectedVariable;
}
public void setSelectedVariable(String selectedVariable) {
this.selectedVariable = selectedVariable;
}
public List<String> getVariables() {
List<String> ret = new ArrayList<>();
//just simulating
ret.add("1");
ret.add("2");
ret.add("3");
ret.add("4");
return ret;
}
//</editor-fold>
//<editor-fold desc="Other methods">
public void updateText(){
//I get the NullPointerException right on next line
String variavelAInserir = "<".concat(this.selectedVariable).concat(">");,
/*
code do other suffs
*/
}
//</editor-fold>
}
Sorry about any language errors, was need change some names because its a “job” for a company.
Well, I solved using the binding property.
After I bound a inputTextArea in my bean. I was able to get the selectedValue in my listener method.
The reason for the execute not “really” execute the set method before the execution of the listener i didnt discover yet.
Anyway, thank you two guys for the great help 🙂 This was my first time asking in stackoverflow and you two were very prestative 🙂
Thanks!