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POJSF 1.2: Options for dropdown list not updated when it is set for the first time
 

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    <p>I have written a program using jsf 1.2 . In this program a user needs to select his <strong>country, state</strong>, and <strong>city</strong>. When he selects a <strong>country</strong>, he must see the list of states in it in a dropdown &amp; when he selects a state, he must see the cities in it in a dropdown.</p> <p>For that I have created 2 classes, 1 inner class , and one jsf page.</p> <p>When I select a country , I can see a dropdown for state is immediately shown.</p> <p>Problem is when a state is changed, the drop down for city is not immediately seen. Only after 2nd change in state, the drop down for cities is seen.</p> <p>(Note: I cannot remove the method <code>cityChangeListener()</code> in this code , as i need to generate an id using country-code,state-code,city-code,and a random number. )</p> <p>Any help would be highly appreciated.</p> <p>Here is my code (4 files):</p> <p>file: faces-config.xml</p> <pre><code>&lt;?xml version='1.0' encoding='UTF-8'?&gt; &lt;faces-config version="1.2" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd"&gt; &lt;managed-bean&gt; &lt;managed-bean-name&gt;formBackingBean&lt;/managed-bean-name&gt; &lt;managed-bean-class&gt;FormBackingBean&lt;/managed-bean-class&gt; &lt;managed-bean-scope&gt;session&lt;/managed-bean-scope&gt;&lt;/managed-bean&gt; &lt;/faces-config&gt; </code></pre> <p>file: newjsf.jsp</p> <pre><code>&lt;%@page contentType="text/html" pageEncoding="UTF-8"%&gt; &lt;%@taglib prefix="f" uri="http://java.sun.com/jsf/core"%&gt; &lt;%@taglib prefix="h" uri="http://java.sun.com/jsf/html"%&gt; &lt;f:view&gt; &lt;h:form&gt; &lt;h:inputText id="input" value="#{formBackingBean.input}" immediate="true" disabled="true" /&gt; &lt;br/&gt; &lt;h:selectOneMenu id="country" value="#{formBackingBean.country}" valueChangeListener="#{formBackingBean.countryChangeListener}" immediate="true" onchange="submit();" &gt; &lt;f:selectItems id="countries" value="#{formBackingBean.countries}" /&gt; &lt;/h:selectOneMenu&gt; &lt;br/&gt; &lt;h:selectOneMenu id="state" value="#{formBackingBean.state}" valueChangeListener="#{formBackingBean.stateChangeListener}" immediate="true" onchange="submit();" rendered="#{formBackingBean.states!=null}" &gt; &lt;f:selectItems id="states" value="#{formBackingBean.states}" /&gt; &lt;/h:selectOneMenu&gt; &lt;br/&gt; &lt;h:selectOneMenu id="city" value="#{formBackingBean.city}" immediate="true" onchange="submit();" rendered="#{formBackingBean.cities!=null}" valueChangeListener="#{formBackingBean.cityChangeListener}" &gt; &lt;f:selectItems id="cities" value="#{formBackingBean.cities}" /&gt; &lt;/h:selectOneMenu&gt; &lt;/h:form&gt; &lt;/f:view&gt; </code></pre> <p>file: FormBackingBean.java</p> <pre><code>import java.util.List; import javax.faces.context.FacesContext; import javax.faces.event.ValueChangeEvent; import javax.faces.model.SelectItem; public class FormBackingBean { private String input; private String country; private String state; private String city; private List&lt;SelectItem&gt;countries=GeoMapLister.WORLD.getNamesOfPlacesWithin();//MapLister.countryList; private List&lt;SelectItem&gt;states=null; private List&lt;SelectItem&gt;cities=null; public FormBackingBean() { } public String getCity() { return city; } public String getCountry() { return country; } public String getState() { return state; } public void setCity(String city) { this.city = city; FacesContext.getCurrentInstance().renderResponse(); } public void setCountry(String country) { this.country = country; FacesContext.getCurrentInstance().renderResponse(); } public void setState(String state) { this.state = state; } public List&lt;SelectItem&gt; getCities() { return cities; } public List&lt;SelectItem&gt; getCountries() { return countries; } public List&lt;SelectItem&gt; getStates() { return states; } public void setCities(List&lt;SelectItem&gt; cities) { this.cities = cities; } public void setCountries(List&lt;SelectItem&gt; countries) { this.countries = countries; } public void setStates(List&lt;SelectItem&gt; states) { this.states = states; } public String getInput() { return input; } public void setInput(String input) { this.input = input; } public void countryChangeListener(final ValueChangeEvent valueChangeEvent){ input=valueChangeEvent.getNewValue().toString(); states=GeoMapLister.WORLD.getPlacesWithin().get(input).getNamesOfPlacesWithin(); state=null; cities=null; city=null; FacesContext.getCurrentInstance().renderResponse(); } public void stateChangeListener(final ValueChangeEvent valueChangeEvent){ input=valueChangeEvent.getNewValue().toString(); cities=GeoMapLister.WORLD.getPlacesWithin() .get(country).getPlacesWithin().get(input) .getNamesOfPlacesWithin(); city=null; FacesContext.getCurrentInstance().renderResponse(); } public void cityChangeListener(final ValueChangeEvent valueChangeEvent){ input=valueChangeEvent.getNewValue().toString(); FacesContext.getCurrentInstance().renderResponse(); } } </code></pre> <p>file: GeoMapLister.java</p> <pre><code>import java.util.ArrayList; import java.util.HashMap; import java.util.List; import javax.faces.model.SelectItem; public class GeoMapLister { public static class GeographicalLocation{ private final GeographicalLocation parent; private final String code; private final String name; private final List&lt;SelectItem&gt;namesOfPlacesWithin; private final HashMap&lt;String,GeographicalLocation&gt;placesWithin; public GeographicalLocation(GeographicalLocation parent,String code, String name,boolean leaf) { this.parent = parent; this.name = name; this.code= code; ArrayList&lt;SelectItem&gt; namesofplaceswithin = null; HashMap&lt;String,GeographicalLocation&gt; placeswithin = null; if(!leaf){ namesofplaceswithin = new ArrayList&lt;SelectItem&gt;(); namesofplaceswithin.add(new SelectItem(null, "- select -")); placeswithin = new HashMap&lt;String,GeographicalLocation&gt;(); placeswithin.put(null, null); } this.namesOfPlacesWithin = namesofplaceswithin; this.placesWithin = placeswithin; } public String getName() { return name; } public GeographicalLocation getParent() { return parent; } public List&lt;SelectItem&gt; getNamesOfPlacesWithin() { return namesOfPlacesWithin; } public String getCode() { return code; } public GeographicalLocation addPlaceWithin(String code,String name,boolean leaf){ GeographicalLocation newGeographicalLocation = new GeographicalLocation(this, code,name,leaf); placesWithin.put(code,newGeographicalLocation); namesOfPlacesWithin.add(new SelectItem(code, name)); return newGeographicalLocation; } public HashMap&lt;String, GeographicalLocation&gt; getPlacesWithin() { return placesWithin; } List&lt;SelectItem&gt; getPlacesWithin(String input) { return placesWithin.get(input).namesOfPlacesWithin; } } public static final GeographicalLocation WORLD=new GeographicalLocation(null, "WORLD","WORLD",false); static { GeographicalLocation IN = WORLD.addPlaceWithin("IN", "India", false); GeographicalLocation MH = IN.addPlaceWithin("MH", "Maharashtra", false); MH.addPlaceWithin("MU", "Mumbai", true); MH.addPlaceWithin("PU", "Pune", true); MH.addPlaceWithin("NA", "Nashik", true); GeographicalLocation KA = IN.addPlaceWithin("KA", "Karnataka", false); KA.addPlaceWithin("BA", "Bangalore", true); KA.addPlaceWithin("MA", "Mangalore", true); GeographicalLocation BE = IN.addPlaceWithin("BE", "West Bengal", false); BE.addPlaceWithin("KO", "Kolkata", true); BE.addPlaceWithin("KH", "Kharagpur", true); //-------------- GeographicalLocation UK = WORLD.addPlaceWithin("UK", "U.K.", false); GeographicalLocation YO = UK.addPlaceWithin("YO", "York", false); YO.addPlaceWithin("SS", "Sussex", true); YO.addPlaceWithin("MS", "Middlesex", true); //-------------- GeographicalLocation US = WORLD.addPlaceWithin("US", "U.S.A.", false); GeographicalLocation NY = US.addPlaceWithin("NY", "New York", false); NY.addPlaceWithin("NC", "New York city", true); NY.addPlaceWithin("NU", "New York urban", true); GeographicalLocation CA = US.addPlaceWithin("CA", "California", false); CA.addPlaceWithin("WA", "Washington, district of California", true); CA.addPlaceWithin("SI", "Silicon Valley", true); CA.addPlaceWithin("VS", "Very-Silly-Con Valley", true); } } </code></pre>
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