Question

我有一个包含大量视图的应用程序。我遵循的顺序是，当应用程序启动时，它显示“登录”视图。当我登录时，显示“SelectPerson”视图，显示许多人的可选图像。当我选择图像时，会显示“AwardOverview”视图。然后我选择按钮返回显示的“SelectPerson”视图。但是，也会出现“正在加载奖励概述，请稍候......”（在“AwardOverview”视图中弹出一个）消息。这表明尽管行“rootPanel.remove（AwardOverview）;”，“AwardOverview”视图也在后台重新加载。代码如下。

如何正确删除“AwardOverview”视图（一旦我获得此信息，我将为所有视图实现它。）

此致

格林

package org.AwardTracker.client;
/**
 * The purpose of this package is to define the 
 * entry point classes onModuleLoad(). List each
 * view below.
 * If you add a view here then also update NavHandler.java.
 */


import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;

/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
public class AwardTracker implements EntryPoint {

public void onModuleLoad() {

    NavHandler nav = new NavHandler(RootPanel.get());
    nav.setLogin(new LoginView(nav));
    nav.setNewAccount(new CreateAccountView(nav));
    nav.setUpdateAccount(new UpdateAccountView(nav));
    nav.setSelectPerson(new SelectPersonView(nav));
    nav.setAwardOverview(new AwardOverviewView(nav));
    nav.setAwardGroup(new AwardGroupView(nav));
    nav.setEditYouthMember(new EditYouthMemberView(nav));
    nav.setEditAwards1(new EditAwardsView1(nav));
    nav.setEditAwards2(new EditAwardsView2(nav));
    nav.setEditAwards3(new EditAwardsView3(nav));
    nav.setAccountUpdate(new AccountUpdateView(nav));
    nav.setYouthMemberList(new YouthMemberListView(nav));
    nav.setScoutAward(new ScoutAwardView(nav));
    nav.setAwardStock(new AwardStockView(nav));

    RootPanel.get().add(new LoginView(nav));
    }

}

package org.AwardTracker.client;
/**
 * The purpose of this package is to define the 
 * widgets that make up the Award Tracker views.
 * If you add a view here also update AwardTracker.java.
 */

import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;

public class NavHandler {

private RootPanel rootPanel;
private Widget login;
private Widget createAccount;
private Widget updateAccount;
private Widget selectPerson;
private Widget awardOverview;
private Widget awardGroup;
private Widget editYouthMember;
private Widget editAwards1;
private Widget editAwards2;
private Widget editAwards3;
private Widget accountUpdate;
private Widget youthMemberList;
private Widget scoutAward;
private Widget awardStock;

public NavHandler(RootPanel rootPanel2) {
    this.rootPanel = rootPanel2;
}

public void go(String code) {
    rootPanel.clear();
    RootPanel.get().clear();
    login.removeFromParent();
    createAccount.removeFromParent();
    updateAccount.removeFromParent();
    selectPerson.removeFromParent();
    awardOverview.removeFromParent();
    awardGroup.removeFromParent();
    editYouthMember.removeFromParent();
    editAwards1.removeFromParent();
    editAwards2.removeFromParent();
    editAwards3.removeFromParent();
    accountUpdate.removeFromParent();
    youthMemberList.removeFromParent();
    scoutAward.removeFromParent();
    awardStock.removeFromParent();


    if (code.equalsIgnoreCase("Login")){
        rootPanel.add(login);
    }else if (code.equalsIgnoreCase("CreateAccount")){
        rootPanel.add(createAccount);
    }else if (code.equalsIgnoreCase("UpdateAccount")){
        rootPanel.add(updateAccount);
    }else if (code.equalsIgnoreCase("SelectPerson")){
        rootPanel.add(selectPerson);
    }else if (code.equalsIgnoreCase("AwardOverview")){
        rootPanel.add(awardOverview);
    }else if (code.equalsIgnoreCase("AwardGroup")){
        rootPanel.add(awardGroup);
    }else if (code.equalsIgnoreCase("EditYouthMember")){
        rootPanel.add(editYouthMember);
    }else if (code.equalsIgnoreCase("EditAwards1")){
        rootPanel.add(editAwards1);
    }else if (code.equalsIgnoreCase("EditAwards2")){
        rootPanel.add(editAwards2);
    }else if (code.equalsIgnoreCase("EditAwards3")){
        rootPanel.add(editAwards3);
    }else if (code.equalsIgnoreCase("AccountUpdate")){
        rootPanel.add(accountUpdate);
    }else if (code.equalsIgnoreCase("YouthMemberList")){
        rootPanel.add(youthMemberList);
    }else if (code.equalsIgnoreCase("ScoutAward")){
        rootPanel.add(scoutAward);
    }else if (code.equalsIgnoreCase("AwardStock")){
        rootPanel.add(awardStock);
        }

}

public void setLogin(Widget view) {
    login = view;
}

public void setNewAccount(Widget view) {
    createAccount = view;
}

public void setUpdateAccount(Widget view) {
    updateAccount = view;
}

public void setSelectPerson(Widget view) {
    selectPerson = view;    
}

public void setAwardOverview(Widget view) {
    awardOverview = view;
}

public void setAwardGroup(Widget view) {
    awardGroup = view;
}


public void setEditYouthMember(Widget view) {
    editYouthMember = view;
}

public void setEditAwards1(Widget view) {
    editAwards1 = view;
}

public void setEditAwards2(Widget view) {
    editAwards2 = view;
}

public void setEditAwards3(Widget view) {
    editAwards3 = view;
}

public void setAccountUpdate(Widget view) {
    accountUpdate = view;
}

public void setYouthMemberList(Widget view) {
    youthMemberList = view;
}

public void setScoutAward(Widget view) {
    scoutAward = view;
}

public void setAwardStock(Widget view) {
    awardStock = view;
}

}

按钮返回“SelectPerson”视图：

//Add each button to the horizontal panel.
btnSelectYM.addClickHandler(new ClickHandler() {
    public void onClick(ClickEvent event) {
    navHandler2.go("SelectPerson");
    }
});
btnSelectYM.setStyleName("gwt-PushButton-up");
btnSelectYM.setText("Select Youth Member");
btnSelectYM.setWidth("184px");
btnSelectYM.setHeight("40px");
horizontalPanel.add(btnSelectYM);

Answer 1

尝试使用Widget#removeFromParent()从其父窗口小部件中移除此窗口小部件（如果存在）。

使用

AwardOverview.removeFromParent();

而不是

rootPanel.remove(AwardOverview);

OR

尝试删除所有子窗口小部件的Panel#clear()。

RootPanel.get().clear();'

OR

尝试清除rootPanel的RootPanel#clear(boolean)。如果clearDom为true，则还删除任何不是小部件的DOM元素。

注意：尊重Java Naming Convention。

当我显示另一个视图时，GWT视图重新加载

1 个答案: