Question

有没有办法从Java applet警报窗口将浏览器窗口拉到前台/焦点？我在一个html页面中有一个applet，它会显示一个带有按钮的警报。当按下按钮时，我希望原始浏览器窗口从任何地方弹出（最小化，覆盖等）。我相信有一种方法可以将Java连接到Javascript来执行此操作，但我不知道Javascript。

这是Java applet代码：

/** An applet that posts an alert and waits for the alert button to be pressed.
* Version 1 uses http://java.sun.com/products/plugin/1.3/docs/jsobject.html
*/

import netscape.javascript.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Bounce extends JApplet implements ActionListener {
    JDialog dialog;
    JSObject window;
    String message;

    public void paint(Graphics g) {
        g.clearRect(0,0, 400,40);
        g.drawString(message,40,20);
    }

    public void init() {
        JFrame frame= null;
        dialog= new JDialog(frame, "Bounce App");

        JButton setupButton= new JButton("Bounce it back!");
        setupButton.addActionListener(this);

        JPanel contentPane= new JPanel();
        contentPane.add(setupButton);
        contentPane.setOpaque(true);
        dialog.setContentPane(contentPane);

        dialog.setSize(new Dimension(400, 110));
        dialog.setVisible(true);

        message= "This applet posts an alert panel.";
        window= JSObject.getWindow(this);
//      String[] params= { "An alert message" };
//      window.call("alert", params);
//      window.eval("alert('Important Alert!')");
    }

    public void actionPerformed(ActionEvent e) {
        dialog.setVisible(false);
        dialog.dispose();
        System.err.println("button has been pushed; focus set");
        message= "Somebody pushed my bounce-back button."; 
        JSObject document= (JSObject)window.getMember("document");
        document.setMember("bgColor", "orange");
        window.eval("focus()");
        repaint();
    }

}

这是HTML代码：

    <HTML>
    <HEAD><TITLE>The Reappearing Page</TITLE></HEAD>
    <body bgcolor="#f0ffc0">

    <H2>Make this page reappear</H2>
    This page will start an applet (white box below) that sets up an alert.
    Before you respond to the alert, hide the window you are reading right now,
    using one of these methods:<ul>
    <li> cover it with another window, </li>
    <li> Hide it using a menu item, </li>
    <li> Minimize it, or </li>
    <li> move it to another workspace or desktop. </li>
    </ul>
    Then click on the button in the alert. 

    <P>
    <EMBED type="application/x-java-applet;version=1.3" width="400" height="40" 
        align="baseline" code="Bounce.class" MAYSCRIPT=true
       pluginspage="http://java.sun.com/products/plugin/1.3/plugin-install.html">
    <NOEMBED>
       No JDK 1.3 support for APPLET!!
    </NOEMBED>
    </EMBED>

    <P>What is supposed to happen is that the main window 
    will emerge from wherever you hid it and reappear.
    Since I don't know how to do this, it is your challenge to actually make it happen.
    We need to be able to achieve this magic from any of the situations listed above.</P>

    </body>

Answer 1

（从评论改为答案，所以我可以为你发布一个不错的代码片段）没有可靠的方法去＆＃34;前景＆＃34;一个使用JavaScript的窗口，除非它是你自己从父页面创建的窗口，原因显而易见（＆＃34;祝贺!!你是我们的第1000个客户，你赢了奖品!!!!!＆＃34; ）。如果您已使用另一个窗口中的window.open将applet窗口作为弹出窗口加载，则可以尝试使用window.focus：

var w = window.open(appletPageUrl);
w.focus()

我认为弹出窗口拦截器并不欣赏这种东西，所以YMMV。就个人而言，如果用户选择隐藏/最小化您的应用，我建议您考虑用户是否想知道您的提醒。

Java / Javascript将包含applet的浏览器窗口带到前台

1 个答案: