Closed
Bug 166882
Opened 23 years ago
Closed 23 years ago
Netcsape 6.3.3 hangs on applet method call in onLoad function of html page
Categories
(SeaMonkey :: General, defect)
Tracking
(Not tracked)
RESOLVED
DUPLICATE
of bug 166883
People
(Reporter: i_simnani, Assigned: asa)
Details
User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0)
Build Identifier:
My web application is coming up nicely in netscape 4.7(and IE). But it is
hanging Netscape 6.2.3 when I launch it in Netscape 6.2 and when I close my
netscape 6.2 it gives an illegal memory instruction voilation error. I think I
have figured out the root cause. I have three frames in my window, one of the
frames has an applet. The HTML file of the frame with the applet has an onLoad
attribute which is equated to a javscript function.The javascript function
finds the current frame hieght and width and passes these as parameters to an
applet method -"document.myname.TheApplet.appletmethod(int , int)". This
appletmethod method in addition to calling a couple of application specific
methods also calls the repaint() method.It is this -
"document.myname.TheApplet.appletmethod()" which is causing the problem. If
comment this out this line, my application web page comes up fine.
Here is what I feel is happening. In our application we use both java to
javascript communication and vice versa. Intially when we have the appletmethod
call in the OnLoad of my html, the applet does not init properly and my
netscape 6 hangs. In fact In the javascript console I consistently see that
whenever netscape hangs, it gets stuck at the following line of code in my
applet getJSWindow.eval("parent.RightFrameload('"+ sRightFrameURL +"');").My
guess is that either the applet or javascript gets an invalid object handle
leading to the hanging of netscape(or something similar). However if I comment
this applet method call in the onLoad function of browser and implement it as a
link which calls the same applet method, it is called properly and even my
application comes up fine. So the issue is with the intial loading sequencing
of the applet and the way Nestcape browser parses javascript, html and
sequences applet execution. I confirmed my suspicion by writing a timer delay
function in javascript giving enough time for the applet to load and calling my
applet method only after the timeout. This time my applet method call works
fine even if it is in the onLoad function of the browser.
I am enclosing a sample html file and applet code which closely mimics my
problem.If you comment out the second statment of the javascript function f(s),
it works fine. If you uncomment it, netscape 6.2 hangs. In the javascript
console you can see that at the time of hanging the applet gets stuck jsut
before a win.eval or win.call method(trying to reach the browser window). Again
if I put the same applet method call in an onClick of a href, it works fine
then as the applet has compltely loaded by then.So the issue is again with the
intial sequencing events.
After netscape hangs(cpu usage >98%) , If I close netscape it tells me an
illegal memory access voilation.
Here is the sample html file and applet.You should definetly be able to
recreate the problem on netscape 6.2.3.
********
<html>
<head><title>Test</title>
<script language="JavaScript">
function f(s)
{
alert(s);
//BUG -?? UNCOMMENTING THE FOLLOWING LINE HANGS NETSCAPE 6.2.3
// document.someapplet.disp('hello from browser to applet');
}
</script>
</head>
<body>
<a href="#" onClick="f('gecko bugs on the web');"> My aplication on web </a>
<br> <br>
<!-- BUT THE FOLLWING LINE INVOKES APPLET METHOD CALL WITHOUT ANY ISSUES -->
<a href="#" onClick="document.someapplet.disp('hello from browser to
applet');">talk to applet</a>
<BR>
Test Page
<BR>
<APPLET CODE="MyApplet.class" NAME="someapplet" WIDTH=170 HEIGHT=150 MAYSCRIPT
>
</APPLET>
Test Page End
</body>
</html>
**************
/* Applet java code below */
import netscape.javascript.*;
import java.applet.*;
import java.awt.*;
public class MyApplet extends Applet {
public void init() {
System.out.println("Inside applet -place1");
JSObject win = JSObject.getWindow(this);
String args[] = {"data passed from applet - alert in javascript"};
win.call("f", args);
// Call f() in HTML page
// win.eval("f('Hello Syed');");
System.out.println("Inside applet -place2");
//win.eval("alert('javascript alert from applet');");
System.out.println("Inside applet -place3");
}
public void disp(String msg) {
JSObject wina = JSObject.getWindow(this);
try {
String myarr[] = new String[1];
myarr[0] = msg;
wina.call("alert",myarr);
} catch(Exception e)
{
System.out.println("MyMessage: caught exception in
eval");
}
System.out.println("Inside applet in disp method");
System.out.println("The argumnet passed to applet from browser is: "
+msg);
}
}
*****************************************
Thank you.
Syed Iqbal Simnani
Reproducible: Always
Steps to Reproduce:
1.Compile applet.Keep second statement line of javascript function f(s) in the
html page commented.
2.open html with Netscape 6.2.3. It works fine.
3.Uncomment the above mentioned line in step 1.It hangs Netscape and on closing
gives illegal memory reference problem.
Actual Results:
Please see above.
Expected Results:
Mozialla enabled nestcape 6.2 browser should work fine in both the cases.
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Comment 1•23 years ago
|
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*** This bug has been marked as a duplicate of 166883 ***
Status: UNCONFIRMED → RESOLVED
Closed: 23 years ago
Resolution: --- → DUPLICATE
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Updated•21 years ago
|
Product: Browser → Seamonkey
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Description
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