How to dynamically add JSF components

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-上瘾入骨i 2020-11-22 05:22

Can I add JSF components dynamically? I need to have a form with a button which should add one to the form. Is this possible?

I know

3条回答

半阙折子戏 (楼主)

2020-11-22 06:06

Use an iterating component like or to display a dynamically sized List of entities. Make the bean @ViewScoped to ensure that the list is remembered across postbacks on the same view instead of recreated over and over.

Kickoff example with (when using simply replace by , and by e.g.

Managed bean:

@Named
@ViewScoped
public class Bean {

    private List items;

    @PostConstruct
    public void init() {
        items = new ArrayList<>();
    }

    public void add() {
        items.add(new Item());
    }

    public void remove(Item item) {
        items.remove(item);
    }

    public void save() {
        System.out.println("items: " + items);
    }

    public List getItems() {
        return items;
    }

}

Model:

public class Item {

    private String value;

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    public String toString() {
        return String.format("Item[value=%s]", value);
    }

}

How to dynamically add JSF components

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