Question

我有两个演示者：DevicePresenter和ContainerPresenter。我在DevicePresenter中放置一个PlaceRequest，用这样的参数调用ContainerPresenter：

PlaceRequest request = new PlaceRequest.Builder()
                        .nameToken("containersPage")
                        .with("action","editContainer")
                        .with("containerEditId", selectedContainerDto.getUuid().toString())
                        .build();
placeManager.revealPlace(request);

在我的ContainersPresenter中，我有这个被覆盖的方法：

@Override
public void prepareFromRequest(PlaceRequest placeRequest) {
    Log.debug("prepareFromRequest in ContainersPresenter");
    super.prepareFromRequest(placeRequest);

    String actionString = placeRequest.getParameter("action", "");
    String id;
    //TODO: Should we change that to really retrieve the object from the server? Or should we introduce a model that keeps all values and inject that into all presenters?
    if (actionString.equals("editContainer")) {
        try {
            id = placeRequest.getParameter("id", null);
            for(ContainerDto cont : containerList) {
                Log.debug("Compare " + id + " with " + cont.getUuid());
                if(id.equals(cont.getUuid())) {
                    containerDialog.setCurrentContainerDTO(new ContainerDto());
                    addToPopupSlot(containerDialog);
                    break;
                }
            }
        } catch (NumberFormatException e) {
            Log.debug("id cannot be retrieved from URL");
        }
    }
}

但是当调用revealPlace时，浏览器中的URL保持不变，而是显示默认的演示者（Home）。当我打印请求时，似乎没问题：

PlaceRequest(nameToken=containersPage, params={action=editContainer, containerEditId=8fa5f730-fe0f-11e3-a3ac-0800200c9a66})

我的NameTokens是这样的：

public class NameTokens {
    public static final String homePage = "!homePage";
    public static final String containersPage = "!containersPage";
    public static final String devicesPage = "!devicesPage";

    public static String getHomePage() {
        return homePage;
    }

    public static String getDevicesPage() {
        return devicesPage;
    }

    public static String getContainersPage() {
        return containersPage;
    }

}

我错过了什么？谢谢！

Answer 1

在您的原始代码中，在构建PlaceRequest时，您忘记了＆＃39;！＆＃39;在你的名字开头。

.nameToken("containersPage")

，而您的NameTokens条目是

public static final String containersPage = "!containersPage";

正如您所指出的，在NameTokens中引用常量不太容易出现如此容易出错的错误！

Answer 2

有时问题存在于“耳朵之间”。如果我避免字符串，但使用NameTokens中的正确符号，如

            PlaceRequest request = new PlaceRequest.Builder()
                    .nameToken(NameTokens.containersPage)
                    .with("action","editContainer")
                    .with("containerEditId", selectedContainerDto.getUuid().toString())
                    .build();

它运作得很好。遗憾！

尝试以正确的方式使用PlaceRequest

2 个答案: