Call applet method with javascript

my html - code:
<APPLET NAME="Mail" ... ... ></APPLET>
<form action="javascript:document.applets("Mail").test("Execute JAVA Applet Function")">
<input type="submit" value="Execute Applet Function">
</form>
my applet code:
public void test(String t)
{System.out.println("executing test()");
teststr = t;
repaint();
in the paint() method i draw the teststr with Graphics.drawString - but nothing happens...
any suggestions?
thx

Directly calling a Java Applet's public method from within
JavaScript is made possible by LiveConnect which is not implemented by Internet Explorer as of yet. LiveConnect is only available on Netscape navigator at this time.

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Call applet methods from Javascript

Hello,
If I call applet method like :
function callbackFunc(){
var pp = appletID.getData();
alert(pp);
It works only if applet is deployed with <APPLET> tag or with javascript.
If applet is deployed using <Object> and <embed> tags, in browser console the error is :
TypeError: appletID.getData is not a function
I couldn't find why is that behaviour. What do I do wrong?
Thanks

Hi Paul,
(1)Seems to be your Java Runtime Environment path is still setted for JRE 1.3.0_01 and not for 1.3.1. So pelase go to the
Control Panel-->java plugin 1.3.1-->Advanced. Here you set the Java Runtime Environment to the JRE 1.3.1 version. Its better to remove the older version before installing the new version on JRE.
(2)<OBJECT> tag won't work for Netscape. You can only use <APPLET> or <EMBED> tag for Netscape.
Hope this will help you.
Anil
Developer Technical Support
Sun Microsystems
http://www.sun.com/developers/support

Call applet method with arguments from JavaScript

I have an applet with a method doSomething(int a, String b, double c), I want get a,b,c from threee text fields put into an HTML page, and pass them to the applet method. I've a very poor knowledge in JavaScript, how can I pass correctly the arguments without raise a CastException? It seems to me that JavaScript doesn't have int, String, double.....

Hi!
You can verify before you send the parameters to the applet
Something like that:
var result = parseInt (a);
if (result =NaN)
alert("Sorry not Int");
return false;
and after that you can send the parammeters to the applet that way:
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adina

Call Applet method from JavaScript, tiny test program works... SOMETIMES!?

I have an embedded Applet in a web page, and I am trying to directly call a method in that Applet from the same page, using JavaScript.
Here is the complete Applet:
import java.applet.Applet;
public class Test extends Applet {
public String test() {
return "test() method return value";
}Here is the complete web page:
<HTML>
<HEAD><TITLE>Applet Invocation test</TITLE></HEAD>
<BODY>
<APPLET CODE="Test" WIDTH=10 HEIGHT=10 NAME="test"></APPLET>
<HR>
<SCRIPT>
document.write( "JavaScript is working<br>" );
document.write( document.test.test() );
</SCRIPT>
</BODY>
</HTML>Is there anything wrong with this? Because it works about 15% of the time, displaying an <HR>, "JavaScript is working", and then "test() method return value" on the next line.
The other 85% of the time, it just gets to "JavaScript is working", then I get a JavaScript error "Object does not support this property or method" for the line: document.write( document.test.test() );
Now here's another weird quirk... I can get it to work ALL the time, if I delay the execution of the Applet method. For example, if the first line after <SCRIPT> is alert( "alert" ); then the user gets a little dialog box with "alert" message in it, and when they hit OK execution continues, and the applet method call ALWAYS works. (On a side note, if I make the Applet test() method static, it NEVER works. Why is this?)
So it seems to me, that when it is failing, it is because the Applet is not completely loaded into the browser yet. My question is, how can I get around this?? Is there a way to instruct JavaScript to wait until the Applet is finished loading before attempting to call any methods on it?
PS I am using Windows ME and IE 6

Thanks for the reply, I appreciate it. I have another question, if you don't mind... here is what my new test web page looks like:
<HTML>
<HEAD>
<TITLE>Applet Invocation test</TITLE>
<SCRIPT>
function testFunc()
document.write( document.test.test() );
</SCRIPT>
</HEAD>
<BODY onLoad="testFunc()">
<APPLET CODE="Test" WIDTH=10 HEIGHT=10 NAME="test">
</APPLET>
<HR>
</BODY>
</HTML>What happens is: the page loads, I see a 10x10 grey applet box, and a <HR>... then a split second later, onLoad is fired, and everything on the page so far is REPLACED with the output of testFunc(), so the ONLY thing on the page after this all completes is "test() method return value"
Why is a single document.write() statement CLEARING the page before outputting? I don't understand. If calling a document.write() from an onLoad event wipes out everything on the page, this is not extremely helpful solution.

Calling FP Methods with Javascript

I'd like to be able to jump to specific pages in my
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function setThePage gets a page number from the HTML link and feeds
the value to the flash file (which my flashpaper movie clip loads
into). That value is then dumped into a function that eventually
sets the setThePage value equal to setCurrentPage, which is listed
in the flashpaper API as the function that changes the current
page. I've had no luck. I'm getting a javascript error telling me
the object doesn't support the method or function and I think it
has to do with the setCurrentPage function only working on the load
of the flashpaper swf. Does anyone have a different solution for
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Rich,
I am interested in doing similar things from within a
FlashPaper document loaded into my Flash movie. I wish to create
links within the FlashPaper doc. that will talk to Actionscript in
the main movie. I know that using the Flash 8 ExternalInterface
Class is key, but in creating links in a Word Doc that eventually
becomes FP, I haven't a clue. It's easy enough to create links that
navigate to other URLs, or with the same page, but with the parent
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Invoking Applet methods from Javascript for Netscape 6

Hi,
I am trying to invoke an applet method from javascript, but it is failing with Netscape 6 browser:
I am doing it the following way-
function test(form)
var i = document.myapplet.getname();
where myapplet is the name of the applet and getname is a method within the applet. This is
working with Ie but not with netscape 6.
I would appreciate it if someone could tell me how should I invoke the applet method for netscape browsers.
Thanks.
Jay Srin.

Not working with NS 6 - and will not i guess till they upgrade to Mozilla Version 1.0 - Live Connect is not implemented 100% correct yet - if you want you can download the 7.0 Pre Release Netscape - since its using mozilla 1.0 it should work , see :
http://forum.java.sun.com/thread.jsp?forum=30&thread=272975

Calling a method with a string

Here's the question:
I want to call a method with the name equal to a string variable.
For example, if the string variable contains "hellojava" , i'd like the hellojava() method to be called..
if the string contains "error", the error() method should be called..
and so on..:)

Here is an example I had thrown together for this
purpose of the exact demonstration, Ar'nt you in luck.:-). If there is anything you don't understand,
I can be reached at [email protected] and will be happy to help....
import java.lang.reflect.*;
import java.io.*;
class Test {
     String name = "Default";
        public Test(String name) {
                this.name = name;
        public void test() {
                System.out.println("Hello");
     public void count() {
          for(int i=0; i<10; i++) {
               System.out.println(i);
       public static void main(String[] args) {
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                         Class myClass = myObject.getClass();
               BufferedReader bRead =
                    new BufferedReader(
                    new InputStreamReader( System.in ));
               String bufStr = null;
               while( (bufStr = bRead.readLine()) != "exit") {
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}Good Luck,
-- Ian

Calling a method with parameters in jstl?

i need to call a method with a series of String parameters what am i doing wrong?
the java
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this works:
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public ArrayList getEmployeeSkillsReport()
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org.apache.jasper.JasperException: Exception in JSP: /main.jsp:146
143:      </jsp:useBean>
144:
145:
146:      <c:forEach var="empskill" items="${empskill.EmployeeSkillsReport}">
147:      </c:forEach>
148:
149:
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     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
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     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
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root cause
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     org.apache.jsp.main_jsp._jspService(main_jsp.java:244)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
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root cause
javax.servlet.jsp.JspException: An error occurred while evaluating custom action attribute "items" with value "${empskill.EmployeeSkillsReport}": Unable to find a value for "EmployeeSkillsReport" in object of class "com.Database.EmployeeSkill" using operator "." (null)
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     org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:129)
     org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.evaluate(ExpressionEvaluatorManager.java:75)
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     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
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Call to Applet Method from JavaScript Failed.

I Am calling a method from a javascript function from within a web page.
The page is loaded into a frame. The parent window of the frame has stored a reference to the applet which defines the methods. Note I am treating the reterence to the applet as a global variable. So that I can reference it methods as I navigate from one page to another.
I have JavaScript objects defined, and I am passing them as parameters to the applet's methods. In java, the JavaScript objects are refererenced as JSObject. When I call a java method passing a JavaScript
Object I get the following exception. Note Iam using j2sdk1.4.2_01 on a Windows 2000 Professional System. This problem start occurring after the recent Microsoft Worm/Virus a fix was loaded on my system which resulted in the following bug. Could someone please help me.
java.lang.NullPointerException
     at sun.plugin.javascript.ocx.JSObject.setIExplorerAppletContext(Unknown Source)
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     at sun.plugin.com.DispatchImpl.invokeImpl(Unknown Source)
     at sun.plugin.com.DispatchImpl$2.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.plugin.com.DispatchImpl.invoke(Unknown Source)
java.lang.Exception: java.lang.NullPointerException
     at sun.plugin.com.DispatchImpl.invokeImpl(Unknown Source)
     at sun.plugin.com.DispatchImpl$2.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.plugin.com.DispatchImpl.invoke(Unknown Source)

A little code snippet would help. I use JSObjects from Java 1.4 no problem and do have all the latest updates. I also have JavaScript calling Java code as well - also with no problem.

Problem calling applet method using IE

I've searched through the forum and can't seem to find anything that can help me fix this. I'm trying to call an applet's method using Javascript. This is working fine under Netscape, but not IE. Everything I've read seems to indicate that I'm doing this right, but I'm getting "Object doesn't support this property or method" when I try to call the applet method from IE.
In this example method, I'm trying to call the applet's countChars method, which should return the length of the string you pass into it. Works under Netscape 6.2, but not IE 6.0
Here's my applet code:
import java.lang.String;
public class test extends java.applet.Applet {
public static int countChars(String s) {
return s.length();
And my HTML
<HTML>
<HEAD>
<script language="Javascript">
function refreshApplet()
/*     i = document.forms.myForm.TestApplet.countChars();
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</script>
</HEAD>
<BODY>
<APPLET CODE = "test.class" WIDTH = 400 HEIGHT = 400 ALIGN = middle NAME = "TestApplet" scriptable="true">
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<br>
<form name="myForm">
<input type="text" name="input">
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<hr>
<input type="text" name="output">
</form>
</BODY>
</HTML>
Thanks in advance!
Craig Drabik
Sr. Programmer/Analyst
University at Buffalo

I have very similar problem, my applet works OK using Netscape (6.2 and 7.0), but with IE 6.0 It only works with windows XP;
The reported error is "Object doesn't support this property or method"
Can someone please help me to solve this problem.
Cheers
Horus
This is my code:
- I call the applet using javaScript and input the method setData with two strings.
function graphic()
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     var dataManual;
     initVariables();
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I run the applet with this HTML code:
<applet NAME="AppletOne" code="Appl.class" width="450" height="450"
MAYSCRIPT></applet>
//Applet code/////////////
import java.awt.*;
import java.awt.geom.*;
import java.applet.*;
import java.util.*;
public class Appl extends Applet {
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     private int [] myArray2 = new int [156];
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Graphics2D g2d = (Graphics2D)g;
setData(data1, data2) ;
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Changing applet parameters with Javascript

Is it possible to have an applet read a param value which has been changed with Javascript after the applet loads?
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Well that page says that param values can't be changed at run-time. Never mind though because I read some more and found out how to implement a method in the applet (which can be called from Javascript) that reads the host page's DOM, thereby achieving the same result.
Thanks for the pointer.

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The issue I am facing is the following :
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In an WPF Desktop application, it would not be an issue because a WebBrowser
(the equivalent of a webView) has a property ObjectForScripting to which we can assign a C# object containg the methods we want to call from the javascript.
In an Windows Store Application, it is slightly different because the WebView
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void MainPage_Loaded(object sender, RoutedEventArgs e)
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When the event ScriptNotify is raised by calling window.external.notify(parameter), the method webView_ScriptNotify is called with the parameter sent by the javascript :
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var returnValue;
window.external.notify(parameter);
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} else {
In android, the mechanism in the webView allows to return the value of the call to a C# method, in a WPF application also. But I can't figure why for a Windows Store App we don't have this possibility.

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i guess the problem is that you can't do anything in the applet outside the dialog if it is modal and visible.
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Hi,
I have a Java class called abc.java and in that I have a method called assignValue(String value).
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Thanks.

Yes I did, and I still don't get it, I have created a JSF web application, not an applet, as I posted earlier my code to executes sit's in a class file, not an applet file.
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</jsp:root>All I get is a grey box the size of the applet window. Could you please let me know what I'm doing wrong?

Call a method with complex data type from a DLL file

Hi,
I have a win32 API with a dll file, and I am trying to call some methods from it in the labview. To do this, I used the import library wizard, and everything is working as expected. The only problem which I have is with a method with complex data type as return type (a vector). According to this link, import library wizard can not import methods with complex data type.
The name of this method is this: const std::vector< BlackfinInterfaces::Count > Counts ()
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struct Count
Count() : countTime(0) {}
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It seems that I should manually use the Call Library Function Node. How can I configure parameters for the above method?

You cannot configure Call Library Function Node to call this function. LabVIEW has no way to pass a C++ class such as vector to a DLL.

Call applet method with javascript

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