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I know that I can't do it in Primefaces directly, I understand that I have to do it in Converter but don't really know at which stage and how? And what exactly should I check? Maybe to do this I need to wedge in a lifecycle of JSF? For example after p:Autocomplete add item to list in a "Apply request values phase" I should check if there duplicate item and remove it before "Update model values phase", if I understand JSF lifecycle in a right way? Is it possible at all? Thank you in advance.
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It's possible, what you have to do is to keep the model up to date for each of user's selection/unselection. That's done using a <p:ajax /> tag into the <p:autoComplete />, so the List of selected items will be updated in the back-end. Later on, when user asks for other query, mind about that List.
Check out this SSCCE with a List of String values (you might choose to use a Converter or not for your custom classes, but that's not related at all with your question):
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:p="http://primefaces.org/ui">
<h:head />
<h:body>
<h:form>
<p:outputLabel value="Multiple:" />
<p:autoComplete multiple="true"
value="#{autoCompleteBean.selectedItems}"
completeMethod="#{autoCompleteBean.completeItem}" var="it"
itemLabel="#{it}" itemValue="#{it}" forceSelection="true">
<p:ajax event="itemSelect" />
<p:ajax event="itemUnselect" />
<p:column>
<h:outputText value="#{it}" />
</p:column>
</p:autoComplete>
</h:form>
</h:body>
</html>
@ManagedBean
@ViewScoped
public class AutoCompleteBean {
/**
* The items currently available for selection
*/
private List<String> items = new ArrayList<String>();
/**
* Current selected items
*/
private List<String> selectedItems = new ArrayList<String>();
/**
* All the items available in the application
*/
private List<String> allItems = new ArrayList<String>();
/**
* Create a hardcoded set of items and add all of them for selection
*/
public AutoCompleteBean() {
allItems.add("item1");
allItems.add("item2");
allItems.add("item3");
allItems.add("item4");
items.addAll(allItems);
}
/**
* Check the current user query for selection. If it fits any of the items
* of the system and it's not already selected, add it to the filtered List
*
* @param query
* @return
*/
public List<String> completeItem(String query) {
List<String> filteredList = new ArrayList<String>();
for (String item : allItems) {
if (item.startsWith(query) && !selectedItems.contains(item)) {
filteredList.add(item);
}
}
return filteredList;
}
public List<String> getItems() {
return items;
}
public List<String> getSelectedItems() {
return selectedItems;
}
public void setSelectedItems(List<String> selectedItems) {
this.selectedItems = selectedItems;
}
}
Current version of PrimeFaces (6.2.x) has an "unique" attribute for this matter.
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