How to select combobox by id or value using with BeanItemContainer? - vaadin

Question

I am using BeanItemContainer for my comboboxes to satisfy key-value pairs.
#SuppressWarnings("serial")
public class ComboBoxItem implements Serializable {
private String id;
private String description;
public ComboBoxItem(final String id, final String description) {
this.id = id;
this.description = description;
}
public final void setId(final String id) {
this.id = id;
}
public final void setDescription(final String description) {
this.description = description;
}
public final String getId() {
return id;
}
public final String getDescription() {
return description;
}
}
I created a sample combobox as below
List<ComboBoxItem> lstAuctionDateList = new ArrayList<ComboBoxItem>();
lstAuctionDateList.add(new ComboBoxItem("all", "All"));
BeanItemContainer<ComboBoxItem> auctionDateItems = new BeanItemContainer<ComboBoxItem>(ComboBoxItem.class,
lstAuctionDateList);
final ComboBox cbAuctionDate = new ComboBox("Auction Date", auctionDateItems);
cbAuctionDate.addStyleName("small");
cbAuctionDate.setNullSelectionAllowed(false);
cbAuctionDate.setTextInputAllowed(false);
cbAuctionDate.setItemCaptionPropertyId("description");
cbAuctionDate.addValueChangeListener(new ValueChangeListener() {
public void valueChange(final ValueChangeEvent event) {
if (cbAuctionDate.getValue() != null) {
System.out.println(((ComboBoxItem) cbAuctionDate.getValue()).getId());
System.out.println(((ComboBoxItem) cbAuctionDate.getValue()).getDescription());
}
}
});
It is fine but I can't select any of combobox items by using below codes
cbAuctionDate.select("all");
cbAuctionDate.select("All");
cbAuctionDate.setValue("all");
cbAuctionDate.setValue("All");
What am I wrong ? How can I select my comboxes by programmatically ?

Answer 1

when using a (bean) container and adding items, the identity of the item itself is used as the itemId in the container. E.g. cbActionDate.select(lstAuctionDateList[0]) should work.
You either have yo make your objects immutable or use ways to tell the container, what it has to use for an id (E.g. setBeanIdProperty("id") or setBeanIdResolver).
Making the object immutable should be easy right now (make the class and the private attributes final, drop the setters and let your IDE generate equals and hashCode for you)

Answer 2

You don't need the cbAuctionDate.addItem("All") call, you already have such a item in your collection
I would try it that way:
List<ComboBoxItem> lstAuctionDateList = new ArrayList<ComboBoxItem>();
ComboBoxItem allItems= new ComboBoxItem("all", "All");
lstAuctionDateList.add(allItems);
....
...
cbAuctionDate.select(allItems);

Answer 3

Now I created custom ComboBox component for my problem
public class ComboBox extends CustomComponent implements Serializable {
private com.vaadin.ui.ComboBox comboBox;
private BeanItemContainer<ComboBoxItem> entries = new BeanItemContainer<ComboBoxItem>(ComboBoxItem.class);
public ComboBox() {
comboBox = new com.vaadin.ui.ComboBox();
comboBox.addStyleName("small");
comboBox.setNullSelectionAllowed(false);
comboBox.setTextInputAllowed(false);
setCompositionRoot(comboBox);
}
public ComboBox(final String caption) {
comboBox = new com.vaadin.ui.ComboBox();
comboBox.addStyleName("small");
comboBox.setNullSelectionAllowed(false);
comboBox.setTextInputAllowed(false);
setCaption(caption);
setCompositionRoot(comboBox);
}
public ComboBox(final String caption, final List<ComboBoxItem> items) {
comboBox = new com.vaadin.ui.ComboBox();
comboBox.addStyleName("small");
comboBox.setNullSelectionAllowed(false);
comboBox.setTextInputAllowed(false);
setCaption(caption);
if (items != null && items.size() > 0) {
entries.addAll(items);
comboBox.setContainerDataSource(entries);
comboBox.setItemCaptionMode(ItemCaptionMode.PROPERTY);
addItems(entries);
comboBox.select(items.get(0));
comboBox.setItemCaptionPropertyId("description");
}
setCompositionRoot(comboBox);
}
public final void addItems(final List<ComboBoxItem> items) {
if (items != null && items.size() > 0) {
entries.addAll(items);
comboBox.setContainerDataSource(entries);
comboBox.setItemCaptionMode(ItemCaptionMode.PROPERTY);
addItems(entries);
comboBox.select(items.get(0));
comboBox.setItemCaptionPropertyId("description");
}
}
private void addItems(final BeanItemContainer<ComboBoxItem> items) {
comboBox.addItems(items);
}
public final void addItem(final ComboBoxItem item) {
if (item != null) {
comboBox.setContainerDataSource(entries);
comboBox.addItem(item);
comboBox.setItemCaptionPropertyId("description");
}
}
public final void selectByIndex(final int index) {
Object[] ids = comboBox.getItemIds().toArray();
comboBox.select(((ComboBoxItem) ids[index]));
}
public final void selectById(final String id) {
Object[] ids = comboBox.getItemIds().toArray();
for (int i = 0; i < ids.length; i++) {
if (((ComboBoxItem) ids[i]).getId().equals(id)) {
selectByIndex(i);
break;
}
}
}
public final void selectByItemText(final String description) {
Object[] ids = comboBox.getItemIds().toArray();
for (int i = 0; i < ids.length; i++) {
if (((ComboBoxItem) ids[i]).getDescription().equals(description)) {
selectByIndex(i);
break;
}
}
}
public final int getItemCount() {
return comboBox.getItemIds().toArray().length;
}
public final String getSelectedId() {
return ((ComboBoxItem) comboBox.getValue()).getId();
}
public final String getSelectedItemText() {
return ((ComboBoxItem) comboBox.getValue()).getDescription();
}
public final void addValueChangeListener(final ValueChangeListener listener) {
comboBox.addValueChangeListener(listener);
}
}
and below is test codes
final ComboBox combo = new ComboBox("My ComboBox");
combo.addItem(new ComboBoxItem("all", "All"));
// Add with list
List<ComboBoxItem> items = new ArrayList<ComboBoxItem>();
items.add(new ComboBoxItem("one", "One"));
items.add(new ComboBoxItem("two", "Two"));
items.add(new ComboBoxItem("three", "Three"));
combo.addItems(items);
combo.addItem(new ComboBoxItem("four", "Four"));
combo.addItem(new ComboBoxItem("five", "five"));
combo.selectByIndex(3);
combo.addValueChangeListener(new ValueChangeListener() {
public void valueChange(final ValueChangeEvent event) {
System.out.println(combo.getSelectedId() + " --- " + combo.getSelectedItemText());
}
});