Hi all
I'm having problems with using AjaxFormComponentUpdatingBehavior.
I'd like to make to ListChoices which contain a list of countries and
cities. For example, if I select one item in the first ListChoice and the
second ListChoice should display the related cities. Since I dont know how
to get some lists of cities, I just arbitrarily pick up one list to use.
the following is part of my code.
My case is that it actually works when the frontpage is opened at the first
time. However, after the first click, the second doesnt work and that
getModelObjectAsString gives me null value.
Could someone please help me out?? Thanks in advance. BTW, I also wanna know
how to get some lists of cities. :-DMany thanks..
************************************************************************************************************
private String countries;
private String countries1;
private ListChoice countryListChoice;
private ListChoice countryListChoice1;
private List<String> tl;
private List<String> testlist;
public SearchForm(String id) {
super(id);
setModel(new CompoundPropertyModel(""));
tl = CountryListChoice.getCOUNTRIES();
testlist = CountryListChoice.getCOUNTRIES();
setOutputMarkupId(true);
CountryListChoice clc = new CountryListChoice();
countryListChoice = new ListChoice("countries", new
PropertyModel(this,
"countries"), tl, clc.getRenderer());
countryListChoice.setOutputMarkupId(true);
add(countryListChoice);
CountryListChoice clc1 = new CountryListChoice();
countryListChoice1 = new ListChoice("countries1", new
PropertyModel(this,
"countries1"), testlist, clc.getRenderer());
countryListChoice1.setOutputMarkupId(true);
add(countryListChoice1);
countryListChoice.add(new
MyAjaxFormComponentUpdatingBehavior("onChange"){
/* (non-Javadoc)
* @see
com.smartbooking.wicket.component.MyAjaxFormComponentUpdatingBehavior#onUpdate(org.apache.wicket.ajax.AjaxRequestTarget)
*/
@Override
protected void onUpdate(AjaxRequestTarget target) {
// TODO Auto-generated method stub
if(countryListChoice.getModelObject() != null){
testlist.clear();
String c =
countryListChoice.getModelObjectAsString();
System.out.println("\n\nour c : " + c + "\n\n");
testlist.add(c);
}else{
testlist.clear();
testlist.add("xing said null");
System.out.println("\n\n really null!!!
\n\n");
}
target.addComponent(countryListChoice1);
}});
}
/**
* @return the countries
*/
public String getCountries() {
return countries;
}
/**
* @param countries the countries to set
*/
public void setCountries(String countries) {
this.countries = countries;
}
/**
* @return the countries1
*/
public String getCountries1() {
return countries1;
}
/**
* @param countries1 the countries1 to set
*/
public void setCountries1(String countries1) {
this.countries1 = countries1;
}
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