Passing parameter to applet using JavaScript

Nancy · 05-04-2000 05:09 PM

I am writing an application where I obtain data from one site, when I click
a submit button I request another site to open. The second site contains
an applet that contains a form. I want to put the data into the form. My
JavaScript function to open the form and insert the data is called by the
page onLoad event. The problem is that the applet isn’t finished initalizing
before the showForm method is called. I get an “object does not exist” error,
then the form opens (without my data). Here’s my function. Any help would
be appreciated.

<script language=”JavaScript”>
function Selected() {
var handyString = parent.location.search;
var startOfSource = handyString.indexOf("acct=");
if (startOfSource != -1){
var result = handyString.substring(startOfSource+5,20);
top.MapFrame.document.MapCafe.externalAPI("FindTool SetReqName Find \r\n");
top.MapFrame.document.MapCafe.externalAPI("FindTool SetText \""+result+"\"");
top.MapFrame.document.MapCafe.externalAPI("FindTool Show\r\n");
}
}
</script></head>
<BODY onload="Selected();">
<APPLET………………

Tom Duffy · 05-05-2000 11:28 AM

Hello Nancy:

It sounds to me like this is a problem more related to the stateless nature
of HTTP. Here's one strategy off the top of my head:

Write a cookie to the user's machine using JavaScript on your first page
in the onUnload method. Then read the cookie on the next page in the same
fashion and call document.write to write out the HTML for the page. In your
document.write call, pass some parameters to the applet containing the data
you need to pass to the applet. This assumes that your applet is configured
to accept the parameters.

In all honesty, you should consider a servlet so that you can get a hold
of a session object to store the information (unless I've completely misunderstood
the problem!).

The obvious workaround, however, is to avoid the data transfer altogether
and have the user enter data directly into your applet. If this is possible
it might be the way to go.

Tom Duffy

"Nancy" <Nancy.Clauss@co.charlotte.fl.us> wrote:
>
>I am writing an application where I obtain data from one site, when I click
>a submit button I request another site to open. The second site contains
>an applet that contains a form. I want to put the data into the form.
My
>JavaScript function to open the form and insert the data is called by the
>page onLoad event. The problem is that the applet isn’t finished initalizing
>before the showForm method is called. I get an “object does not exist”
error,
>then the form opens (without my data). Here’s my function. Any help would
>be appreciated.
>
><script language=”JavaScript”>
>function Selected() {
> var handyString = parent.location.search;
> var startOfSource = handyString.indexOf("acct=");
> if (startOfSource != -1){
> var result = handyString.substring(startOfSource+5,20);
>top.MapFrame.document.MapCafe.externalAPI("FindTool SetReqName Find \r\n");
> top.MapFrame.document.MapCafe.externalAPI("FindTool SetText \""+result+"\"");
> top.MapFrame.document.MapCafe.externalAPI("FindTool Show\r\n");
> }
>}
></script></head>
><BODY onload="Selected();">
><APPLET………………
>
>

John Timney (MVP) · 05-07-2000 01:32 PM

You could also add some code to determine if the applet is loaded yet before
doing anything else in the page, even better is to get it to call the
javascript selected function from within the applet once it loads by marking
the applet with the MAYSCRIPT tag to allow it to call javascript using the
javascript:dofunction and getAppletContext method.

Regards

John Timney (MVP)

checking if the applets loaded....

<SCRIPT>
function AppletReady(x) {
return x.isActive();
}
</SCRIPT>

<FORM>
<INPUT TYPE=button
VALUE="Check applet"
onClick="if (!AppletReady(document.applets[0])) alert("not ready");" >
</FORM>

an example of calling Javascript from an applet.

import java.applet.*;
import java.net.*;

public class inJava extends Applet{
public void init(){
String msg = "We will jump to an HTML tag";
try {
getAppletContext().showDocument
(new URL("javascript:doAlert(\"" + msg +"\")"));
getAppletContext().showDocument
(new URL("javascript:jumpTo(\"#JUMP\")"));
}
catch (MalformedURLException me) { }
}
}

[Javascript and HTML] <HTML><HEAD></HEAD><BODY>
<SCRIPT>
function doAlert(s) {
alert(s);
}
function jumpTo(tag) {
self.location=tag;
}
</SCRIPT>
<APPLET CODE="inJava.class"
NAME="myApplet" MAYSCRIPT
HEIGHT=400 WIDTH=10>
</APPLET>
<P>
<A NAME="JUMP">jump here from Java via Javascript</A>
</BODY>
</HTML>

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