HI! i m a beginner in that kind of developpement, richfaces i mean... i just need to find a good exemple to start well,
i did once, but i could not understand what is exactly the type of object "Data",

public List autocomplete(Object suggest) {
 String pref = (String)suggest;
 ArrayList result = new ArrayList();

 Iterator iterator = getAllData().iterator();
 while (iterator.hasNext()) {
 Data elem = (Data) iterator.next();
 if ((elem != null && elem.getText().toLowerCase().indexOf(pref.toLowerCase()) == 0) || "".equals(pref))
 {
 result.add(elem);
 }
 }
 return result;
 }

 public ArrayList getCities() {
 return cities;
 }

 public void setCities(ArrayList cities) {
 this.cities = cities;
 }

 public ArrayList getAllData() {
 ArrayList result = new ArrayList();
 for (int i = 0; i < cit.length; i++) {
 Data data = new Data(cit, String.valueOf(i + 1));
 result.add(data);
 }
 return result;
 }

so if someone can explain me this or give a good link for suggestion box example, it will be just so great!!!