java以编程方式更新Vaadin网格

Question

我试图使用Vaadin 14创建一个网格，该网格由调用下面updateFieldByName方法的事件处理程序更新。但是，网格永远不会刷新

我想要实现的只是：

    aaa 1
    bbb 2

updateFieldByName（“aaa”、“ok”）

    aaa ok
    bbb 2

我试过使用网格。设置项（属性）和网格。setDataProvider（dataProvider），但该表只是不想更新

List<Property> properties = Arrays.asList(new Property("aaa", "1"), new Property("bbb", "2"));
ListDataProvider<Property> dataProvider = DataProvider.ofCollection(properties);

Grid<Property> grid = new Grid<>(Property.class);
grid.setDataProvider(dataProvider);

private void updateFieldByName(final String name, final String value) {
    properties.stream().filter((o) -> o.getName().equals(name)).forEach((p) -> {
        p.setValue(value);
        dataProvider.refreshAll();
    });
}

public static class Property {
    private String name;
    private String value;

    public Property(final String name) {
        this(name, "-");
    }

    public Property(final String name, final String value) {
        super();
        this.name = name;
        this.value = value;
    }

    public String getName() {
        return name;
    }

    public void setName(final String name) {
        this.name = name;
    }

    public String getValue() {
        return value;
    }

    public void setValue(final String value) {
        this.value = value;
    }

    @Override
    public String toString() {
        return "[" + name + " = " + value + "]";
    }

}

Answer 1

您究竟是如何调用updateFieldByName方法的？我添加了一个TextField，在这里输入一个aaa，在调用ValueChangeEvent之后，网格被正确更新

这是我正在使用的代码。（我为Property类创建了一个单独的类）

import com.vaadin.flow.component.grid.Grid;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.component.textfield.TextField;
import com.vaadin.flow.data.provider.DataProvider;
import com.vaadin.flow.data.provider.ListDataProvider;
import com.vaadin.flow.router.Route;

import java.util.Arrays;
import java.util.List;

@Route("gridSO")
public class GridUpdateSO extends VerticalLayout {

    List<Property> properties = Arrays.asList(new Property("aaa", "1"), new Property("bbb", "2"));
    ListDataProvider<Property> dataProvider = DataProvider.ofCollection(properties);
    public GridUpdateSO() {
        Grid<Property> grid = new Grid<>(Property.class);
        grid.setDataProvider(dataProvider);
        add(grid);
        TextField ab=new TextField("TextField", e->{
            updateFieldByName(e.getValue(),"ok");

        });
        add(ab);
    }
        private void updateFieldByName(final String name, final String value) {
            properties.stream().filter((o) -> o.getName().equals(name)).forEach((p) -> {
                p.setValue(value);
                dataProvider.refreshAll();
            });
        }
    }

属性。java

public class Property {
    private String name;
    private String value;

    public Property(final String name) {
        this(name, "-");
    }

    public Property(final String name, final String value) {
        super();
        this.name = name;
        this.value = value;
    }

    public String getName() {
        return name;
    }

    public void setName(final String name) {
        this.name = name;
    }

    public String getValue() {
        return value;
    }

    public void setValue(final String value) {
        this.value = value;
    }

    @Override
    public String toString() {
        return "[" + name + " = " + value + "]";
    }
}