Java Vaadin 在填充后设置组合框值
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Vaadin set combo box value after it has been filled
提问by Br0thazS0ul
My instance of the combo box is created globally, It gets filled with, lets say a list of companies while the value is an ID. After I load a File, I want to check that I have that value in the combo box and then select it programmatically.
我的组合框实例是全局创建的，它被填充了，比如一个公司列表，而值是一个 ID。加载文件后，我想检查组合框中是否具有该值，然后以编程方式选择它。
class cComboBoxFun extends UI implements ClickListener
{
ComboBox cb_company;
List<cCustomer> ListCust;
//default constructor and server conf not really relevant
@Override
protected void init(VaadinRequest request)
{
//Lets assume the list has been filled already
cb_company = new ComboBox("Company");
for(cCustomer cust : ListCust)
{
cb_company.addItem(cust.mgetId);
cb_company.setItemcaption(cust.mgetId, cust.mgetName);
}
}
class cCustomer()
{
private String name;
private String Id;
public String GetName()
{
return this.name
}
// Same for id
}
I tried checking the value is there and setting it but nothing happens. I looked up but couldn't find an answer
我尝试检查该值是否存在并进行设置，但没有任何反应。我抬头但找不到答案
if(cb_company.getItemCaption(value) != null)
cb_company.set(value);
采纳答案by wypieprz
Assuming that your ComboBoxuses single select mode, you can select a given item programatically with
假设您ComboBox使用单选模式，您可以使用编程方式选择给定的项目
cb_company.select(value)
where valuepoints to cCustomer.Id. So the code may look as follows:
value指向哪里cCustomer.Id。所以代码可能如下所示：
cb_company = new ComboBox("Company");
for(cCustomer cust : ListCust)
{
cb_company.addItem(cust.mgetId);
cb_company.setItemcaption(cust.mgetId, cuts.mgetName);
}
//select the first item from the container
cb_company.select(ListCust.get(0));
