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本文介紹了VaAdin生成的頁面不顯示任何組件的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

我一般對vaadin框架有問題。

我創建了一個擴展vaadin應用程序的類(MyFirst)，之后我使用vaadin可視化設計器(MyFormApp)創建了一個自定義組件。

我確實實例化了自定義組件MyFormApp，并將其添加到MyFirst的主窗口。

部署應用后，vaadin生成的頁面不顯示任何組件。

我的代碼：

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.example.vaadin;

import com.vaadin.Application;
import com.vaadin.ui.*;

/**
*
* @author anis.bouchenafa
*/
public class MyFirst extends Application{


private Button newContact = new Button("Add contact");
private Button search = new Button("Search");
private Button share = new Button("Share");
private Button help = new Button("Help");
private HorizontalSplitPanel horizontalSplit = new HorizontalSplitPanel();
private TextField tf = new TextField();

@Override
public void init() {
    //buildMainLayout();

    MyFirstApp a = new MyFirstApp();
   Window w = new Window("aness conf");
   w.addComponent(a);
   setMainWindow(w);


}

}

我的第二個類是MyFirstApp(自定義組件)：

package com.example.vaadin;



import com.vaadin.annotations.AutoGenerated;
import com.vaadin.ui.AbsoluteLayout;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.LoginForm;

public class MyFirstApp extends CustomComponent {

@AutoGenerated
private AbsoluteLayout mainLayout;
@AutoGenerated
private LoginForm loginForm_2;

/*- VaadinEditorProperties=        {"grid":"RegularGrid,20","showGrid":true,"snapToGrid":true,"snapToObject":true,"movingGuides":false,"snappingDistance":10} */



/*- VaadinEditorProperties={"grid":"RegularGrid,20","showGrid":true,"snapToGrid":true,"snapToObject":true,"movingGuides":false,"snappingDistance":10} */

/**
 * The constructor should first build the main layout, set the
 * composition root and then do any custom initialization.
 *
 * The constructor will not be automatically regenerated by the
 * visual editor.
 */
public MyFirstApp() {
    buildMainLayout();
    setCompositionRoot(mainLayout);

    // TODO add user code here
}

@AutoGenerated
private AbsoluteLayout buildMainLayout() {
    // common part: create layout
    mainLayout = new AbsoluteLayout();
    mainLayout.setImmediate(false);
    mainLayout.setWidth("100%");
    mainLayout.setHeight("100%");

    // top-level component properties
    setWidth("100.0%");
    setHeight("100.0%");

    // loginForm_2
    loginForm_2 = new LoginForm();
    loginForm_2.setStyleName("v-loginform");
    loginForm_2.setImmediate(false);
    loginForm_2.setWidth("340px");
    loginForm_2.setHeight("-1px");
    mainLayout.addComponent(loginForm_2, "top:160.0px;left:200.0px;");

    return mainLayout;
}

}

執行Servlet后，瀏覽器上不顯示任何內容。

推薦答案

好的，您調用buildMainLayout()，它在視覺上是空的。它只包含一個AbsoluteLayout和一個LoginForm()，其中沒有任何組件。這就像生成一個無邊框的HTML表，而不添加任何文本。

我認為您要添加的組件

private Button newContact = new Button("Add contact");
private Button search = new Button("Search");
private Button share = new Button("Share");
private Button help = new Button("Help");
private HorizontalSplitPanel horizontalSplit = new HorizontalSplitPanel();
private TextField tf = new TextField();

應

詳細布局(和其他基礎知識)也在Vaadin書中介紹：

瓦丁之書：https://vaadin.com/book/-/page/intro.html

瓦丁之書-布局：Layout:https://vaadin.com/book/-/page/layout.html

Vaadin布局示例：http://demo.vaadin.com/sampler#Layouts

這篇關于VaAdin生成的頁面不顯示任何組件的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，