Vaadin ComboBox包含值和ID

Question

我已经定义了一个ComboBox允许用户从他的联系人列表中选择联系人的方法.ComboBox显示联系人姓名,但实际上无法用于映射到真实联系人:需要联系人ID.我的问题是我不知道如何填充Vaadin ComboBox链接的值和ID,但只显示值.

// Add all organization contacts to the drop-down
for (Contact contact : organizationContacts) {
    contactName = contact.getName();
    contactId   = contact.getId();
    _logger.debug("Adding contactName=" + contactName + " contactId=" + contactId + " to person with id=" + personId);
    contactNameCombo.addItem(contactName);
}

// Add the contact of this person, and select it in the drop-down
contactName = person.getContact().getName();
contactId   = person.getContact().getId();
contactNameCombo.addItem(contactName);
contactNameCombo.setValue(contactName);

正如你可以在上面的代码中看到,我加入contactName到了ComboBox,但我不知道怎么也添加contactId,这样我可以知道后,从选择的条目,其ID必须用于更新数据库.

Answer 1

有几种方法可以解决这个问题:这里最灵活的方法是将组合框配置为使用命名属性作为标题.有关 详细信息,请参阅 Book of Vaadin选择项目.

// Set the caption mode to read the caption directly
// from the 'name' property of the item
contactNameCombo.setItemCaptionMode(Select.ITEM_CAPTION_MODE_PROPERTY);
contactNameCombo.setItemCaptionPropertyId("name");

// Add all organization contacts to the drop-down
for (Contact contact : organizationContacts) {
    contactName = contact.getName();
    contactId   = contact.getId();
    _logger.debug("Adding contactName=" + contactName + " contactId=" + contactId + " to person with id=" + personId);

    // Note : the itemId of the item is the contactId
    Item item = contactNameCombo.addItem(contactId);
    item.getProperty("name").setValue(contactName)
}
// Add the contact of this person, and select it in the drop-down
contactName = person.getContact().getName();
contactId   = person.getContact().getId();
Item item = contactNameCombo.addItem(contactId);
item.getProperty("name").setValue(contactName)

// Using the itemId (which = contactId) to select the given contact
contactNameCombo.setValue(contactId);

Answer 2

@Charles Anthony给出的解决方案对我来说也不起作用,但是在vadin网页上(https://vaadin.com/book/-/page/components.selecting.html)我找到了以下代码:

// Set item caption for this item explicitly
select.addItem(2); // same as "new Integer(2)"
select.setItemCaption(2, "Deimos");

这适合我.