Gwt Listbox item reference to an Object

I have got a Listbox and i want to add some Items. There are only methods to add items as a String, but I want add a Item to the Listbox with a String and a reference to an Object. So that, if a item was selected in the Listbox, I get the O开发者_运维问答bject reference too. Otherwise I have always to search with equal for the right Object.

Is there any option therefore?

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Try ValueListBox instead of ListBox.

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You could store the object in a Map indexed by the value of the item, or in an array or List, at the index of the added item in the list box.

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This is an old question, but since the most elegant answer is not yet here:

// Applicable for an object of specified type 'User'
ValueListBox<User> lbUser = new ValueListBox<User>(new Renderer<User>() {

  public String render(User user) {
    String s = "";
    if (user != null) {
      // Specify the format for the Strings to display per list item here. In this example, it is 
      // 'username (firstname lastname)'
      // For example: MTielemans (Mark Tielemans)
      s = user.getUsername() + "("+user.getFirstname()+" " + user.getLastname()+")";
    } else {
      s = "Select a user";
    }
    return s; 
  }

  public void render(User user, Appendable appendable) throws IOException {
      String s = render(user);
      appendable.append(s);
  }
});