如何在Vaadin中对ComboBox进行排序? [英] How to sort a ComboBox in Vaadin?
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问题描述
我有一个 ComboBox
,并为数据提供一个 BeanItemContainer
。我还附加了用于默认排序的排序器。但是结果总是无法分类的。为什么?
I have a ComboBox
and provide the data with a BeanItemContainer
. I also attach a sorter for default sorting. But the result is always unsorted. Why?
public class Car {
private String name;
}
private ComboBox box = new ComboBox("sorted cars");
BeanItemContainer<Car> cont = new BeanItemContainer<>(Car.class);
//cont.addItem();...
System.out.prinltn(cont.getSortableContainerPropertyIds()); //prints: [name]
box.setItemSorter(new DefaultItemSorter());
box.sort(new Object[] {"name"}, new boolean[] {true});
box.setContainerDataSource(cont);
推荐答案
似乎您必须为可排序对象生成getter和setter
seems you have to generate getters and setters for the sortable property in your class
public static class Car {
private String name;
public Car(String name){
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return name;
}
}
另外,在分配容器之前,还需要对其进行排序
Also you need to sort your container before you assign it to your combobox
BeanItemContainer<Car> cont = new BeanItemContainer<>(Car.class);
cont.addItem(new Car("Z"));
cont.addItem(new Car("B"));
cont.addItem(new Car("Y"));
cont.addItem(new Car("A"));
cont.sort(new Object[] {"name"}, new boolean[] {true});
comboBox_sort.setContainerDataSource(cont);
我测试了这段代码。应该可以。
I tested this code. It should work.
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