back button

[kompressor2278]

Hi,
Id like to have it be the last function of a submit button in my applet.

the user clicks on a url to get to the applet, clicks a few buttons, when they're
done they will click the submit button, which will submit their data, and then
bring them back to the previous page.

basically saving them a click.

How would I go about this?

[ractoc]

If I remember correctly, it should be possible to acces the JavaScript inside the HTML page from within you applet. By doinbg this, you could just call a JavaScript method which will then call document.history.go(-1); which will make the browser go back to the previous page. It's been a long time since I've read about this feature however, so I'm not sure if it's possible and how.

[kompressor2278]

where did you read about it?

Can anyone else prove / disprove this feature?

**EDIT**

here is what I have tried so far:

if(e.getActionCommand().equals(" SEND ")){
try{
url = new URL(myHost);
con = url.openConnection();
con.setAllowUserInteraction(true);
n=con.getInputStream();
d = new DataInputStream(n);


// back to previous page feature?
burl = new URL("javascript:history.back()");
bcon = burl.openConnection();
bcon.setAllowUserInteraction(true);
bn=bcon.getInputStream();
bd = new DataInputStream(bn);

}catch(Exception x){
inputOutputField.setText("err: bad data");
}

the top part will work, but the back button does not. Any ideas?

[kompressor2278]

putting that javascript code in my applet gives me an exception:


java.net.UnknownServiceException: protocol doesn't support input

[ractoc]

Here's a link that tells you how to activate your applet for Javascript acces:


http://forum.java.sun.com/thread.jsp?forum=421&thread=333244

[kompressor2278]

this guy has some info as well

http://www.xaff.org/JAVA/SPECIAL/mixing.html

but his links are dead to the netscape devel page.

**EDIT**
found the sdk for LiveConnect

http://wp.netscape.com/comprod/development_partners/plugin_api/

http://wp.netscape.com/eng/mozilla/3.0/handbook/plugins/index.html

[ractoc]

Cool, now you should be on your way

[kompressor2278]

okay. Ive got it going. and I am able to access javascript in my applet. I have an issue...naturally.

Lets say that the url 'myHost' does not go to a website, but merely sets a flag.

Here is mycode:

html:

<APPLET CODE=test.class WIDTH=600 HEIGHT=750>
</APPLET>

<SCRIPT>
function backme() {
history.back();
}
</SCRIPT>


Applet:

if(e.getActionCommand().equals(" SEND ")){
try{
// set flag
url = new URL(myHost);
con = url.openConnection();
con.setAllowUserInteraction(true);
n = con.getInputStream();
d = new DataInputStream(n);
}catch(Exception x){
inputOutputField.setText("err: bad data");
}

// go back to prevouis page.
JSObject win = JSObject.getWindow(this);
String args[] = {""};
win.call("backme", args);

}


Now when the send button is hit it will only go back to the previous page.
Maybe a sleep() call will help? Im not sure why it does not try to send data to myHost.

Any help would be appreciated.
Im close, I can taste it.

[ractoc]

did you try the url.connect() method?
and are you sending data through that inputstream?

[kompressor2278]

I did not try the connect() method and I dont need to send data just connecting to the url is enough.


Oddly enough. a reboot fixed my problem. It now does both. Thank you so much for your help.