[2778] in java-interest
showDocument()
daemon@ATHENA.MIT.EDU (Stephen Harris)
Fri Oct 13 06:21:23 1995
From: sweh@mpn.com (Stephen Harris)
To: java-interest@java.sun.com
Date: Fri, 13 Oct 1995 09:05:37 +0100 (BST)
Hi all,
I need to jump to another URL when the user clicks on an active
area - similar to the ImageMap.
Under Alpha-3 this was a call to showDocument(). Am I right in
thinking this has become getAppletContext().showDocument() in
the Beta API? Do I have to perform any special cleanup before
calling this?
Under Netscape 2.0b1J (Solaris) this call will work once and
once only - going back to the page or reloading or even
running another applet totally with this call in it will
go "bang!" and produce:
Exception in thread "AWT-Motif" java.lang.NullPointerException
at netscape.applet.MozillaAppletContext.showDocument(MozillaAppletContext.java:148)
at (reference to my program line calling showDocument())
Is this a Netscape problem, or my problem or???
Here is minimal code to show the problem - click on
the green button, then go back and try again :-(
import java.applet.*;
import java.awt.*;
import java.net.*;
public class x extends java.applet.Applet
{
String u="http://www.mpn.com";
URL url;
public void init()
{
url=new URL(u);
resize(100,100);
}
public void paint(Graphics g)
{
g.setColor(Color.green);
g.fillRect(0,0,100,100);
}
public boolean mouseDown(java.awt.Event evt, int x,int y)
{
getAppletContext().showDocument(url);
return true;
}
}
rgds
Stephen
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