Javascript calling Java?

In which ways can one call Java functions of a applet on a webpage from Javascript?
And also if there's is differences between browsers in this..
/Andreas

Hi,
You'll find everything you need at the following url:
http://www.rgagnon.com/framesets/java-js.html
regards,
Kurt.

Similar Messages

JavaScript: calling Java system code message...

When I try and call an applet function from Javascript, I get the following message in the output window:
JavaScript: calling Java system code
JavaScript: default security policy = file://
... and the method isn't called.
Can someone tell me what I need to do please?

Research pointers:
http://devedge.netscape.com/library/manuals/2000/javascript/1.5/guide/lc.html#1014290
http://java.sun.com/j2se/1.4.1/docs/guide/plugin/developer_guide/js_java.html

Javascript calling Java class

Hello, kindly help. I am calling a java class file for validating a username and password. The browser returns no error but it seems that execution does not even pass my class file.
Here is my class file.
import java.sql.*;
import java.applet.Applet;
public class auth extends Applet {
boolean isAuth = false;
String h;
public void init() {
h = "hello"; }
public void login(String user, String pwd) {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:test");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from users where username ='" + user + "'");
if (rs.next()) {
pswd=rs.getString(2).trim();
     if (pswd.equals(pwd)) {
this.isAuth = true;
rs.close();
con.close();
} catch (Exception ex) {
System.out.println(ex);
Here is aportion of my HTML file.
<script language="JavaScript">

</script>
<applet code="auth.class" name="auth" width="1" height="1" id="auth"></applet>
     <form action="" method="post" name="login" id="login">
<input name="uname" type="text" id="uname2" maxlength="10">
<input name="upwd" type="password" id="upwd2" maxlength="10">
          <INPUT TYPE="button" VALUE="Login" onClick="auth_user(document.login.uname.value, document.login.upwd.value)">
Many thanks,

is it running when you making that call? i.e. i hope
you have a lot more in the body of your applet than
just a string assignment. The applet successfully initialized upon loading. However, even the "auth.h" property which is in the init() and is a simple assignment is undefined when I try to display it.

Javascript calling Java value

Hi,
I've got a slight problem on my JSP page.
I have a value thru a value,
request.getParameter("adcomments");I'm trying to call it via javascript in an input value like the following:
<input name="activate" type="radio" value="3" onClick="document.getElementById('reasondeny').style.display='';document.form1.adm_noapproval.value='"+admconts+"';">I've also set the value in a script tag up the page, referencing the variable as
<script language="javascript">
var admconts = "";
admconts += admconts + <%=admcomments%>;
alert(admconts);
</script>With everything I've tried so far, I've gotten a mixture of unterminated string literal errors and this type of error:
Error: missing ; before statement
Source File: http://10.244.212.97:8080/murach/chngctrl/change_ctrl_admin5b.jsp?primID=3181
Line: 405, Column: 41
Source Code:
admconts += admconts + 1/26 - Submit to Default Audit for gap analysis, due 2/2.
any ideas on where I'm going wrong? Any feedback would be appreciated. Unfortunately the other posts regarding similar javascript issues weren't able to help me solve this.

Unfortunately the other posts regarding similar javascript issues weren't able to help me solve this.If you've read the other posts, then you've probably seen this answer before.
Java is not Javascript. The two can't communicate or share variables directly.
Java/JSP runs on the server, produces an HTML page, and stops running.
Javascript starts running in your browser when/as the page is loading.
You can not communicate directly between the two.
To run java again, you have to send a new request (submit a form, click a link, make an Ajax call)
What you CAN do in the JSP is produce javascript code onto the html page that will be run when in the browser. So you can create basic javascript variables that get their initial value from java/jsp.
// java code declaring a variable
<% String adcomments = request.getParameter("adcomments"); %>
<script language="javascript">

</script>Say that you run this code, and pass a value of "This is my comment" as the parameter.
Java would run, retrieve that parameter, and then generate an HTML page like the following
<script language="javascript">

</script>Thats as close as you can get to java/javascript communication.
Note that it doesn't directly copy the value, just generates the value onto the page. You have to ensure that it is valid javascript.
If your parameter has characters like quotes, newlines etc etc, then that may result in a javascript syntax error. A function to escape javascript characters like that is normally called for. ie replace newlines with \n, and quotes with \"
Hope this helps,
evnafets

How to call java function in javascript

Hello Everyone,
Can anyone tell me solution that:
How to call java function in javascript?
Thanks,
VIDs

You can't since Java is running on the server and javascript is running in the browser long after the Java side of things has finished executing. Assuming you're not talking about an applet here.
But you can make calls back to the server through Ajax. All you need is something like a servlet on the receiving end which you can invoke through Ajax; from that point you can execute any Java code you want.

How to call javascript from java application

How can we call a function written in javascript from java application (core java not applet)? How will java identify javascript?
Is there any such options ?

Try creating a page called launcher.html (for example). That does this:
<html>
<head>
<script language="javascript">
windowHandle=window.open("http://www.javasoft.com", "", "height=700,width=1000,status=no,scrollbars=yes,resizable=yes,toolbar=no,menubar=no,location=no,top=5,left=5");
</script>
</head>
</html>Now you launch IE (or whatever) with this page using the Runtime class. After x seconds (after the second window has been launched) try killing the process. Hopefully it will kill the original window you opened and not the window you popup (the one without toolbars etc)
It might kill both windows but I can't be bothered to test it. If it does you'll have to try and find a workaround.

How to call java function with parameter from javascript in adf mobile?

how to call java function with parameter from javascript in adf mobile?

The ADF Mobile Container Utilities API may be used from JavaScript or Java.
Application Container APIs - 11g Release 2 (11.1.2.4.0)

JavaScript calls method on Java Applet-- Problem

Hi all,
I have a problem as following:
I have a method on JavaScript calling a method on Java Applet. A method on JavaScript repeatedly retrieves data form the server , let's say; every 100 ms and it calls the method on Java to draw a graph(I use thread to call repaint()). The problem is, if I leave the applet site(or the site has lost the focus), the stop() will be called and I can't recieve data from JavaScript anymore. If I go back to the site, the applet starts, but the graph doesn't show the figure, as it supposes to show.
how can I tell the browser doesn't call the stop() or there is another way to solve this problem?
Thanks for all answers. CU.
A-Pex

my own fault.. it's not the browser or the applet.. It's my computer.. it's too old for this applet..
Does anyone know, how to optimize the applet with thread? thanks..

Call Java Method From JavaScript Function

hi everyone
i need a help in calling Java method from a javaScript method
ex:
function confirmAddRecord() {
cHours =document.getElementById('frmP:ChargeHours').value;
cSTime =document.getElementById('frmP:ChargeStartTime').value;
var answer = confirm("Are you sure you want to add Record?")
if (answer){
here i want to call the Java Method that is located in session bean that takes the upper params cHours & cSTime
else{
return false;
i know i can do it as an action button but it is required me to be in that way can any one help plz
Message was edited by:
casper77

That depends on the nature of your parameters. I guess you calculate the params on client and then want to submit them. In this case and if you don't want to use Ajax simple add some <input type="hidden"> elements (of course there correspondend components dependent of your framework) and store the params there. If the javascript isn't invoked by a button click, you can use a button nevertheless. Set visible="false" and call
document.getElementById('client_id_of_my_hidden_button').click();
(or maybe doClick() dependent on your framework).

Javascript to Java (Applet) method call fails in JRE1.4.1 & NN4.79

Win2k, Netscape 4.79, JRE 1.4.1. I'm trying to call an applet method from Javascript from the page which contains the applet. 'm using MAYSCRIPT tag. I'm getting the error "myApplet doesn'nt have any properties". (myApplet is the name of the applet). When I use the default JRE which is supported by NN4.79(Symantic JRE 1.1.5) it works well. Does JRE1.4.1 plugin doesn't support Javascript to Java calls? OR I'm doing something wrong.
Deepak

I'm seeing the same issue. This is supposed to work. I converted the <APPLET> tags in the HTML to use <OBJECT> and <EMBED> tags using Sun's converter (see http://java.sun.com/j2se/1.4/docs/guide/plugin/developer_guide/using_tags.html). I try to reference the applet (using the document.embeds[0] object instead of the document.applets[0] object) and it seems the applet has not been loaded. I can't reference any of the methods in the applet. It appears the applet has not loaded. I do not see any evidence of the applet's init() method being called.
Have you had any luck getting this to work?

Problem while calling java function from html

when i tried to call a java function from html i'm getting an error
object don't support this property.
what could be the reason.
This is my html.
I got this from this forum only.
My applet is accessing the system property "user.home".
I ran it in IE
<DIV id="dvObjectHolder">Applet comes here</DIV>
<br><br>
<script>
if(window.navigator.appName.toLowerCase().indexOf("netscape")!=-1){ // set object for Netscape:
     document.getElementById('dvObjectHolder').innerHTML = " <object ID='appletTest1' classid=\"java:test.class\"" +
"height=\"0\" width=\"0\" onError=\"changeObject();\"" +
          ">" +
"<param name=\"mayscript\" value=\"Y\">" +
"<param name=\"archive\" value=\"sTest.jar\">" +
"</object>";
}else if(window.navigator.appName.toLowerCase().indexOf('internet explorer')!=-1){ //set object for IE
     document.getElementById('dvObjectHolder').innerHTML = "<object ID='appletTest1' classid=\"clsid:8AD9C840-044E-11D1-B3E9-00805F499D93\"" +
          " height=\"0\" width=\"0\" >" +
          " <param name=\"code\" value=\"test.class\" />" +
     "<param name=\"archive\" value=\"sTest.jar\">" +
          " </object>"
</script>
<LABEL id="lblOutputText">This text will be replaced by the applet</LABEL>
<BR>
<input value="Javascript to java" type=button onClick="document.appletTest1.fromJavaScript()">

I tried this example using the repy given to an earlier post.
But its not working with me.
What i did in addition was adding plugin.jar to classpath to import netscape.javascript.*;
Let me add some more details
1) I'll add the stack trace
2) my java progrma
3) batch file to sign the applet.
1) This is the stack trace i don't know whether u will undertand this
load: class test.class not found.
java.lang.ClassNotFoundException: test.class
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.FileNotFoundException: C:\FastranJava\AppletObject\bin\test\class.class (The system cannot find the path specified)
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(Unknown Source)
     at java.io.FileInputStream.<init>(Unknown Source)
     at sun.net.www.protocol.file.FileURLConnection.connect(Unknown Source)
     at sun.net.www.protocol.file.FileURLConnection.getInputStream(Unknown Source)
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more
Exception in thread "Thread-5" java.lang.NullPointerException
     at sun.plugin.util.GrayBoxPainter.showLoadingError(Unknown Source)
     at sun.plugin.AppletViewer.showAppletException(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
2) Java Program
import netscape.javascript.*;
import java.applet.*;
public class test extends Applet
     private JSObject win;
     private JSObject outputLabel;
     private boolean buttonFromJavaClicked=false;
     checkJavaScriptEvent evt=new checkJavaScriptEvent();
     public void init()
          try
               evt.start();
               win=JSObject.getWindow(this);
               outputLabel=(JSObject)win.eval("document.getElementById('lblOutputText')");
               outputLabel.setMember("innerHTML", "<center><h1>From Init<br>Your Home directory" + System.getProperty("user.home") + "</h1></center>");
          catch(Exception e)
               e.printStackTrace();
     public void fromJavaScript()
          buttonFromJavaClicked=true;
     public void fromJavaScript2()
          System.out.println("Started Form JavaScript2");
          try
               String strLbl="<center><h1>From JavaScript<br>Your Homedir:" + System.getProperty("user.home") + "</h1></center>";
               outputLabel.setMember("innerHTML", strLbl);
          catch(Exception e)
               e.printStackTrace();
     class checkJavaScriptEvent extends Thread
          public void run()
               while(true)
                    if(test.this.buttonFromJavaClicked)
                         System.out.println("OK buttonfromjava is true");
                         test.this.buttonFromJavaClicked=false;
                         fromJavaScript2();
                    try
                         Thread.sleep(3000);
                    catch(Exception e)
                         e.printStackTrace();
3) Batch file
del *.cer
del *.com
del *.jar
del *.class
javac -classpath ".;C:\Program Files\Java\jre1.5.0_06\lib\plugin.jar" test.java
keytool -genkey -keystore harm.com -keyalg rsa -dname "CN=Harm Meijer, OU=Technology, O=org, L=Amsterdam, ST=, C=NL" -alias harm -validity 3600 -keypass password -storepass password
jar cf0 test.jar *.class
jarsigner -keystore harm.com -storepass password -keypass password -signedjar sTest.jar test.jar harm
del *.class

Column link - call java script & assign current report column value to item

Hi,
How to call java script and assing current report column value to item?
I have a button column in the report to 'delete' the selected row.
I want to first show dialog box with message 'Are you sure?'. If yes, process to delete
will be executed, else no action.
In order to fire JS, I used Column Link ->Target=URL.
Problem: The alert is showing but I don't know how to pass selected row's primary
key value to process (to delete selected row).
I have a item which can be used to store selected primary key value but don't know how to assign the value
when button pressed.
Thanks in advance
Dip

Ok. The issue has been resolved by following way.
PAGE PROCESS: delete_request
begin
delete xyz
where id = :P8_id;
commit;
end;BUTTON URL:
javascript: DelRec(null,'CREATE', 'f?p=&APP_ID.:8:&SESSION.:delete_request:NO::P8_id:#id#');Java Script:
<script language="JavaScript1.1" type="text/javascript">
function DelRec(msg, req, url){
var confDel = msg;
if(confDel ==null){
confDel= confirm("Are you sure?");
}else{
confDel= confirm(msg);}
if (confDel== true){
redirect(url); }
</script>

Calling java from scripting

Hello,
I would like to integrate some scripting capability in my web application.
The main purpose is to cover the following scenario :
- I develop a web app with JSP technology, packaged in a MyAPP.WAR file containing my application and another file (MyCustomer.RAR?) containing installation specific informations. I want the MyApp.WAR to be the same for all my customers, just having the RAR file specific to each customer (installation).
- In this ressource file, there could be some scripting functions that will be called from my JSP Pages to change the default presentation with some customer particular informations.
Those informations would be extracted from my java data model. The purpose is to enable the customer to code some little script, and to avoid coding those in Java.
The question I have on that are :
1/ is it possible to call java instances from scripting language (I read on apache that the answer was yes for some of them), but I would like to know if javascript can do that.
2/ Can I recover the "result" of the script in JSP ?
An example :
1/ The class containing a marvellous property
class MyClass {
public String myProperty;
2/ The JSP page :
<stlLib:callScript(Customer.RAR, "ScriptToCall",anInstance) />
<stlLib:getResult ???>
3/ A user script (pseudo-code)
Customer 1 :
Function ScriptToCall(object) {
variable iwanttoshowsquareroot;
iwanttoshowsquareroot = squareroot(object.myProperty);
return iwanttoshowsquareroot ;
Customer 2 :
Function ScriptToCall(object) {
variable mychoiceisdifferent;
mychoiceisdifferent= object.myProperty / 2;
return mychoiceisdifferent;
According to what ScriptToCall looks like the result on page would be different
Thanks in advance for your advises
Olivier.

1) The script will be running in the browser, not the server, yes? So in Netscape you can load Java objects via Javascript, but IE doesn't seem to support this. Although in either, you can call methods on an applet in the page. But you can't call a JS function from the Java code in the JSP page, since that is only executed on the server.
2) Only if the "result" is submitted back to the server.

Calling java script from a button

Hi,
I have a Form and I would like to let the end-user to confirm some action that was initiated by pressing a button. The best way would be to call Java script, but the button is an 'item' button and not a 'region' button - i..e it is placed between items and not above the region, like Save, Cancel etc.
In case of 'item' buttons I do not have 'Optional URL Redirect' field where to place the javascript call.
Tamas

You can try this..
Instead of using button
Edit the Item to which you want to associate a button.
Go to Element tab
Under Post Element Text enter
</ br> <a href="#" -onclick=call_me() class="t20Button">Click me</a>Note : you need to change class="t20Button", i'm using theme 20 and in that the look and feel of button is derive from t20Button.
remove the hyphen before onclick ..
Regards,
Shijesh

Java Scipt Calling Java Applet

how could i call java applet in my java script code as i'm going to build an applet for internet application server but i'm going to check user input validation in java script !?!?!!?

in javascript:
theApplet.someMethod()
in html: add a name attribute to the applet tag.
<APPLET CODE=MyApplet.class
NAME="theApplet"
MAYSCRIPT
HEIGHT=150
WIDTH=500>
</APPLET>
the mayscript attribute is added if you want to make applet to javascript communication possible. (and not only javascript to applet communication)

Javascript calling Java?

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