Tho*_*mas 8 javascript java browser focus window
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页面中有一个小程序,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>
（从评论更改为答案，以便我可以为您发布一个像样的代码片段）没有可靠的方法可以使用 JavaScript“前景化”窗口，除非它是您从父页面自己创建的窗口，原因很明显（“恭喜！ ！您是我们的第1000位顾客，您赢得奖品！！！！！！”）。如果您已使用 window.open 从另一个窗口将小程序窗口加载为弹出窗口，则可以尝试使用 window.focus：
var w = window.open(appletPageUrl);
w.focus()
我想弹出窗口拦截器不喜欢这种事情，所以 YMMV。就个人而言，我建议您考虑一下，如果用户选择隐藏/最小化您的应用程序，他们是否想了解您的警报。