Communication from Javascript to Java
I generate a html file by Java, I would like to add one button in this html page so that java program can listen to these buttons to do something else.
So javascript could realize this fonctionaly, but how to communicate this javascript to my java program, how to fire an event when the button is pressed?
Any help or suggestion will be appreciated. Thanks
This is the piece of code to add a button, I think we should add something onto it...
<html>
<head>
<script type="text/javascript">
function myfunction()
alert("HELLO")
</script>
</head>
<body>
<form>
<input type="button"
onclick="myfunction()"
value="Call function">
</form>
<p>By pressing the button, a function will be called. The function will alert a message.</p>
...//the body
</body>
</html>
If you have an Applet on your page with a public method called buttonClicked, you can do something like this:
<html>
<head>
<script type="text/javascript">
function myfunction() {
alert("HELLO");
document.applets["myApplet"].buttonClicked();
//or document.applets.myApplet.buttonClicked();
//or document.applets[0].buttonClicked();
</script>
</head>
<body>
<form>
<input type="button" onclick="myfunction()" value="Call function"/>
</form>
<applet id="myApplet" name="myApplet" code="MyApplet.class" width="300" height="200"></applet>
</body>
</html>
Similar Messages
-
COMMUNICATION BETWEEN JAVASCRIPT AND JAVA APPLET: US$20 AWARD FOR SOLUTION!
COMMUNICATION BETWEEN JAVASCRIPT AND JAVA APPLET PROBLEM (Easy Filter Java Applet) -
US$20 TO ANYONE WHO CAN RESOLVE THE PROBLEM
To forum visitors:
I am prepared to pay a standard shareware fee of US$20 to a user who can resolve this technical problem.
If your advice resolves the problem, I'll forward the payment to your postal address (include your
address with your reply, and also your email address)
I am attempting to enable a HTML button (using Javascript's onClick command) to directly input a number into one of the parameter text boxes in the Easy Filter Java applet (ie, enter a new color value number in the text field of the standard Colors Multiplicator Filter interface).
The applet is Freeware and can be downloaded at: http://www.javazoom.net/applets/easyfilter10/EasyFilter10.html
(It is a very effective bitmap display and editing utility)
To achieve this, I am trying to access the part of the applet that defines and sets the textbox. The text box is defined in the .class file by accessing the parameter details in the genericfilter.txt file (accompanies the .class files). I need to access 'private String appletInitialize()' and then one of the 'textFieldParameters' which sets the textbox.
I understand the basic syntax for referencing the applet:
document.appletname.setString("An example"). However, accessing the text fields in this applet is more complex!!
Please can you recommend the correct Javascript syntax to achieve communication with the applet.
Thank you for your kind assistance.
JM Graham
[email protected]
The Java source code for the applet: EasyFilter.class
# Easy Filter - E.B/JavaZOOM 1999 #
# Contact: [email protected] #
# http://javazoom.hypermart.net #
/* Originally compiled from EasyFilter.java */
import java.awt.*;
import java.io.*;
import java.net.*;
import java.applet.Applet;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.MemoryImageSource;
import java.awt.image.PixelGrabber;
import java.util.Vector;
public synchronized class EasyFilter extends Applet implements KeyListener
private String paramFileName;
private Color bgColor;
private Color fgColor;
private Color parColor;
private Color sepColor;
private Color titleColor;
private Color helpColor;
private int WinWidth;
private int WinHeight;
private String title;
private String logoFileName;
private String originalImageFileName;
private String filteredCaption;
private String originalCaption;
private Vector paramsName;
private Vector paramsValue;
private Vector paramsComment;
private Panel panelParameters[];
private Label labelParameters[];
private TextField textFieldParameters[];
private Label labelComments[];
private int nbParameters;
private ScrollPane scrollPaneParams;
private Panel panelParams;
private Image theLogo;
private Image theOriginalImage;
private Image theFilteredImage;
private int theOriginalPixelArray[];
private int logoWidth;
private int logoHeight;
private int imageWidth;
private int imageHeight;
private drawCanvas canvasTitle;
private Panel panelTitle;
private Label labelTitle;
private Panel panelImages;
private Panel panelOriginalImage;
private drawCanvas canvasOriginalImage;
private Label labelOriginalImage;
private Panel panelFilteredImage;
private drawCanvas canvasFilteredImage;
private Label labelFilteredImage;
private Panel panelHelp;
private Label labelHelp;
private int Yspc;
private FilterImplementation theFilter;
public void init()
String string = null;
string = appletInitialize();
setBackground(bgColor);
if (string != null)
removeAll();
setBackground(Color.white);
setForeground(Color.black);
Label label = new Label(new StringBuffer("Error: ").append(string).toString(), 1);
Panel panel = new Panel();
panel.add(label);
add(panel);
setLayout(new FlowLayout(1, 5, Yspc));
public void keyPressed(KeyEvent keyEvent)
panelHelp.removeAll();
boolean flag = true;
if (KeyEvent.getKeyText(keyEvent.getKeyCode()).equals("Enter"))
for (int i = 0; i < nbParameters; )
try
paramsValue.setElementAt(new Double(textFieldParameters.getText()), i);
i++;
catch (NumberFormatException e)
labelHelp.setText(labelParameters[i].getText() + ": Not a Number");
flag = false;
break;
if (flag == 1)
labelHelp.setText(" .... Running, please wait .... ");
labelHelp.setAlignment(1);
panelHelp.add(labelHelp);
panelHelp.doLayout();
theFilter.updateParameters(paramsValue);
theFilter.computeFilter();
theFilteredImage = createImage(new MemoryImageSource(theFilter.getFinalImageWidth(), theFilter.getFinalImageHeight(), theFilter.getFinalImageBuffer(), 0, theFilter.getFinalImageWidth()));
canvasFilteredImage.setImage(theFilteredImage);
canvasFilteredImage.setBounds(0, 0, theFilter.getFinalImageWidth(), theFilter.getFinalImageHeight());
canvasFilteredImage.repaint();
panelHelp.removeAll();
labelHelp.setText("- Done -");
else
labelHelp.setText("- Press Enter to run the Filter -");
labelHelp.setAlignment(1);
panelHelp.add(labelHelp);
panelHelp.doLayout();
public void keyReleased(KeyEvent keyEvent)
public void keyTyped(KeyEvent keyEvent)
private String appletInitialize()
WinWidth = size().width;
WinHeight = size().height;
if (getParameter("bgcolor") == null)
bgColor = new Color(0, 0, 40);
else
bgColor = new Color(Integer.parseInt(getParameter("bgcolor"), 16));
if (getParameter("fgcolor") == null)
fgColor = new Color(255, 255, 255);
else
fgColor = new Color(Integer.parseInt(getParameter("fgcolor"), 16));
if (getParameter("sepcolor") == null)
sepColor = new Color(158, 128, 128);
else
sepColor = new Color(Integer.parseInt(getParameter("sepcolor"), 16));
if (getParameter("parcolor") == null)
parColor = new Color(24, 24, 24);
else
parColor = new Color(Integer.parseInt(getParameter("parcolor"), 16));
if (getParameter("titlecolor") == null)
titleColor = new Color(255, 255, 0);
else
titleColor = new Color(Integer.parseInt(getParameter("titlecolor"), 16));
if (getParameter("helpcolor") == null)
helpColor = new Color(0, 255, 255);
else
helpColor = new Color(Integer.parseInt(getParameter("helpcolor"), 16));
paramsName = new Vector();
paramsValue = new Vector();
paramsComment = new Vector();
paramFileName = getParameter("paramfile");
String string = readParams(paramFileName);
if (string != null)
return string;
MediaTracker mediaTracker = new MediaTracker(this);
theOriginalImage = getImage(getDocumentBase(), originalImageFileName);
mediaTracker.addImage(theOriginalImage, 0);
if (logoFileName != null)
theLogo = getImage(getDocumentBase(), logoFileName);
mediaTracker.addImage(theLogo, 1);
try
mediaTracker.waitForAll();
catch (InterruptedException e1)
return "Error while loading image";
if (mediaTracker.isErrorAny())
return "Error while loading image";
if (logoFileName != null)
logoWidth = theLogo.getWidth(this);
logoHeight = theLogo.getHeight(this);
imageWidth = theOriginalImage.getWidth(this);
imageHeight = theOriginalImage.getHeight(this);
theOriginalPixelArray = new int[imageWidth * imageHeight];
PixelGrabber pixelGrabber = new PixelGrabber(theOriginalImage, 0, 0, imageWidth, imageHeight, theOriginalPixelArray, 0, imageWidth);
try
pixelGrabber.grabPixels();
panelTitle = new Panel();
canvasTitle = new drawCanvas();
labelTitle = new Label();
panelTitle.setLayout(new FlowLayout(1, 10, Yspc));
add(panelTitle);
panelTitle.setBackground(bgColor);
panelTitle.add(canvasTitle);
canvasTitle.setImage(theLogo);
canvasTitle.setBounds(0, 0, logoWidth, logoHeight);
labelTitle.setText(title);
catch (InterruptedException e2)
return "Internal Error, Try RELOAD !";
if (title != null)
panelTitle.add(labelTitle);
labelTitle.setForeground(titleColor);
labelTitle.setFont(new Font("Dialog", 1, 14));
panelImages = new Panel();
panelOriginalImage = new Panel();
canvasOriginalImage = new drawCanvas();
labelOriginalImage = new Label();
panelFilteredImage = new Panel();
canvasFilteredImage = new drawCanvas();
labelFilteredImage = new Label();
panelImages.setLayout(new FlowLayout(1, 10, Yspc));
add(panelImages);
panelImages.setBackground(bgColor);
panelOriginalImage.setLayout(new BorderLayout(0, 2));
panelImages.add(panelOriginalImage);
panelOriginalImage.setBackground(Color.black);
panelOriginalImage.add("Center", canvasOriginalImage);
canvasOriginalImage.setImage(theOriginalImage);
canvasOriginalImage.setBounds(0, 0, imageWidth, imageHeight);
labelOriginalImage.setText(originalCaption);
labelOriginalImage.setAlignment(1);
panelOriginalImage.add("South", labelOriginalImage);
labelOriginalImage.setBackground(Color.lightGray);
labelOriginalImage.setForeground(Color.black);
labelOriginalImage.setFont(new Font("SansSerif", 0, 10));
panelFilteredImage.setLayout(new BorderLayout(0, 2));
panelImages.add(panelFilteredImage);
panelFilteredImage.setBackground(Color.black);
panelFilteredImage.add("Center", canvasFilteredImage);
theFilter = new FilterImplementation(paramsValue, theOriginalPixelArray, imageWidth, imageHeight);
theFilter.computeFilter();
theFilteredImage = createImage(new MemoryImageSource(theFilter.getFinalImageWidth(), theFilter.getFinalImageHeight(), theFilter.getFinalImageBuffer(), 0, theFilter.getFinalImageWidth()));
canvasFilteredImage.setImage(theFilteredImage);
canvasFilteredImage.setBounds(0, 0, theFilter.getFinalImageWidth(), theFilter.getFinalImageHeight());
labelFilteredImage.setText(filteredCaption);
labelFilteredImage.setAlignment(1);
panelFilteredImage.add("South", labelFilteredImage);
labelFilteredImage.setBackground(Color.lightGray);
labelFilteredImage.setFont(new Font("SansSerif", 0, 10));
scrollPaneParams = new ScrollPane(0);
panelParams = new Panel();
nbParameters = paramsName.size();
int i = WinHeight - (33 + 7 * Yspc + logoHeight + imageHeight + 23);
if (i < Yspc + 2 + 24)
i = Yspc + 2 + 24;
scrollPaneParams.setBounds(0, 0, WinWidth - 10, i);
panelParams.setLayout(new GridLayout(nbParameters, 1, 5, Yspc / 2));
scrollPaneParams.add(panelParams);
panelParams.setBackground(sepColor);
panelParameters = new Panel[nbParameters];
labelParameters = new Label[nbParameters];
textFieldParameters = new TextField[nbParameters];
labelComments = new Label[nbParameters];
for (int j = 0; j < nbParameters; j++)
panelParameters[j] = new Panel();
panelParameters[j].setLayout(new FlowLayout(0, 5, 1));
panelParams.add(panelParameters[j]);
panelParameters[j].setBackground(parColor);
labelParameters[j] = new Label();
labelParameters[j].setText((String)paramsName.elementAt(j));
panelParameters[j].add(labelParameters[j]);
labelParameters[j].setForeground(fgColor);
labelParameters[j].setFont(new Font("Dialog", 1, 12));
textFieldParameters[j] = new TextField(8);
textFieldParameters[j].setText(paramsValue.elementAt(j).toString());
panelParameters[j].add(textFieldParameters[j]);
textFieldParameters[j].setBackground(fgColor);
textFieldParameters[j].addKeyListener(this);
labelComments[j] = new Label();
labelComments[j].setText((String)paramsComment.elementAt(j));
panelParameters[j].add(labelComments[j]);
labelComments[j].setForeground(fgColor);
add(scrollPaneParams);
panelHelp = new Panel();
labelHelp = new Label();
panelHelp.setLayout(new FlowLayout(1, 5, 0));
add(panelHelp);
panelHelp.setBackground(bgColor);
labelHelp.setText(" Change colour values and press enter ");
labelHelp.setAlignment(1);
panelHelp.add(labelHelp);
labelHelp.setForeground(helpColor);
return null;
private String readParams(String string1)
Object object1;
String string2;
if (string1 == null)
return "Filename of filter's parameters needed";
try
URL uRL = new URL(getDocumentBase(), string1);
URLConnection uRLConnection = uRL.openConnection();
uRLConnection.setDoInput(true);
uRLConnection.setUseCaches(false);
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(uRLConnection.getInputStream()));
string2 = null;
catch ()
return object1.getMessage();
catch ()
return object1.getMessage();
catch ()
return object1.getMessage();
if (bufferedReader != null)
Object object2;
try
for (object2 = bufferedReader.readLine(); object2 != null && string2 == null; object2 = bufferedReader.readLine())
string2 = extractFormat(object2);
catch ()
string2 = object2.getMessage();
finally
bufferedReader.close();
if (string2 != null)
return string2;
else
return null;
private String extractFormat(String string1)
if (string1.length() == 0)
return null;
int i = 0;
int j = string1.indexOf(" ", i);
if (j == -1)
return "Bad format error (space missing)";
String string2 = string1.substring(i, j);
if (string2.equals("TITLE"))
i = j;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in TITLE missing)";
i = j + 1;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in TITLE missing)";
title = string1.substring(i, j);
return null;
if (string2.equals("ORIGINALCAPTION"))
i = j;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in ORIGINALCAPTION missing)";
i = j + 1;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in ORIGINALCAPTION missing)";
originalCaption = string1.substring(i, j);
return null;
if (string2.equals("FILTEREDCAPTION"))
i = j;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in FILTEREDCAPTION missing)";
i = j + 1;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in FILTEREDCAPTION missing)";
filteredCaption = string1.substring(i, j);
return null;
if (string2.equals("LOGO"))
i = j + 1;
j = string1.length();
logoFileName = string1.substring(i, j);
return null;
if (string2.equals("ORIGINALIMAGE"))
i = j + 1;
j = string1.length();
originalImageFileName = string1.substring(i, j);
return null;
if (!string2.equals("PARAM"))
return null;
i = j;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format in a PARAM line";
i = j + 1;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format in a PARAM line";
paramsName.addElement(string1.substring(i, j));
i = j + 2;
j = string1.indexOf(32, i);
if (j == -1)
return "Bad format in a PARAM line";
try
paramsValue.addElement(new Double(string1.substring(i, j)));
j = string1.indexOf(34, i);
catch (NumberFormatException e)
return "Bad format in a PARAM line";
if (j == -1)
return "Bad format (Double quote in PARAM comment missing)";
i = j + 1;
j = string1.indexOf(34, i);
if (j == -1)
return "Bad format (Double quote in PARAM comment missing)";
paramsComment.addElement(string1.substring(i, j));
return null;
public EasyFilter()
logoHeight = 33;
Yspc = 5;Addition to my above submission
To clarify, I'll offer the US$20 to the FIRST person who offers me a workable solution to the problem, not to everyone!!!
JMGRAHAM -
Keep getting a message from Javascript (not Java)- "Uninstall Set", help it will not go away
Each time I use Firefox, the message "Uninstall Set" keep popping up from Javascript (not Java). I can not use Firefox because this keeps popping up.
That would be from an extension, anything similar from Firefox would have been cleaned up. If you'd been on 4.0.1 for a while and it just started happening, then I'd try Tools > Add-ons > Extensions then on the gear wheel choose "View Recent Updates" the date will appear the list small and the. The "last updated" button near top right does something mysterious.
To see list in normal fashion again choose "Appearances" then return to "Extensions".
If you dislike the formatting of the Add-ons list during normal viewing you can improve it tremendously with a custom style:
* [https://addons.mozilla.org/firefox/addon/stylish/ Stylish :: Add-ons for Firefox]
* [http://userstyles.org/styles/42112/firefox-4-compact-addons-manager Firefox 4 - Compact Addons Manager - Themes and Skins for browser - userstyles.org]
From the wording the message could possible be referring to a Collection of Extensions. I avoid collection sets like the plague.
Also see related answer
* [https://support.mozilla.com/en-US/questions/824098 i keep getting a pop up saying uninstall set | Firefox Support Forum | Firefox Help] by Cor-el. -
Passing a variable from Javascript to java variable in a JSP.
Here is simple test Ive been messing around with.
How do I assign the value that was selected in the radio button to a java variable in my JSP here. Javascript being client side and JSPs being serverside makes this difficult.
<html>
<head>
<SCRIPT LANGUAGE="JavaScript">
function valbutton(thisform)
myOption = -1;
for (i=0; i<thisform.myradiobutton.length; i++)
if (thisform.myradiobutton.checked)
myOption = i;
if (myOption == -1)
alert("You must select a radio button");
return false;
alert("You selected button number " + myOption + " which has a value of " + thisform.myradiobutton[myOption].value);
thisform.submit();
</SCRIPT>
<title>CreateCategoryContent</title>
</head>
<body>
<BR>
<center>
<%
for(int i = 0; i < 10; i++)
%>
<form name="myform">
<table border="1" bordercolor="#C0C0C0" width="50%" cellpadding="0" cellspacing="0" bgcolor="white">
<tr>
<td><%=i%><input type="radio" VALUE="<%=i%>" name="myradiobutton"></td>
</tr>
<%
%>
</form>
<input type="submit" name="submitit" onclick="valbutton(myform);return false;" value="Validate" />
</table>
</center>
<!--//T2-->
</body>
</html>
Thanks dudes.Please excuse me for appearing dim but my JSP skills are rather weak.
I dynamically create rows in a table from an Iterator. If the mainTopic is news then I need a third column to appear with radio buttons. I have all this done. When a radio button is selected and the UPLOAD button is selected I need to know which of the values in the table was selected.
When I ran the test below the selected value was null. Can you help me?
Thanks.
<%@ page session="false" %>
// imports etc
<%@ page errorPage="../com/digisoft/common/Error.jsp" %>
<html>
<head>
<SCRIPT LANGUAGE="JavaScript">
function valbutton(thisform)
myOption = -1;
for (i=0; i<thisform.myradiobutton.length; i++)
if (thisform.myradiobutton.checked)
myOption = i;
if (myOption == -1)
alert("You must select a radio button");
return false;
alert("You selected button number " + myOption + " which has a value of " + thisform.myradiobutton[myOption].value);
thisform.selected.value=thisform.myradiobutton[myOption].value;
thisform.submit();
</SCRIPT>
<title>CreateCategoryContent</title>
<LINK REL="stylesheet" HREF="<%=request.getContextPath() + "/stylesheets/digihostnews.css"%>" TYPE="text/css">
<%
HttpSession session = request.getSession(false);
String mainTopic = request.getParameter("mainTopic");
String subCategory = request.getParameter("subCategory");
String subCategoryId = request.getParameter("subCategoryId");
String subCategoryToBeDeleted = request.getParameter("subCategoryToBeDeleted");
String selection = request.getParameter("selection");
// other initializations etc
%>
</head>
<body>
<BR>
<!--Another table-->
<center>
<table border="1" bordercolor="#C0C0C0" width="90%" cellpadding="0" cellspacing="0" bgcolor="white">
<tr>
<td class="blue">Select Topic</td>
</tr>
<tr>
<td class="insidebox2">
<BR>
<form action="NewsUpdate.jsp" method=post>
Select Topic
<select NAME="mainTopic" class="dropdown">
<%
Iterator menuItems = myLombardiaMgr.getMainCategories();
while(menuItems.hasNext())
MainCategory aMenuItemCategory = (MainCategory)menuItems.next();
String menuItem = aMenuItemCategory.getMainCategory();
if(!menuItem.equalsIgnoreCase(mainTopic))
%>
<option VALUE="<%= menuItem %>" ><%= menuItem %></option>
<%
else
%>
<option SELECTED VALUE="<%= menuItem %>" ><%= menuItem %></option>
<%
%>
</select>
<INPUT type=submit class="newsbutton" value="LOAD" name=Submit>
</form>
<form action="AddCategoryDescription.jsp" method=post>
<INPUT TYPE=HIDDEN NAME="mainTopic" VALUE="<%=mainTopic%>">
<INPUT type=submit class="newsbuttonlong" value="EDIT DESCRIPTION" name=Submit>
</form>
</td>
</tr>
</table>
</center>
<!--//Another table-->
<!--T2-->
<center>
<table border="1" bordercolor="#C0C0C0" width="90%" cellpadding="0" cellspacing="0" bgcolor="white">
<tr><td class="blue">Categories</td></tr>
<tr>
<td class="insidebox2">
<BR>
<form action="NewsUpdate.jsp" method=post>
Add Category
<input type="text" name="subCategory" class="dropdown" id="catId" value=""/>
<INPUT TYPE=HIDDEN NAME="mainTopic" VALUE="<%=mainTopic%>">
<%
if (mainTopic != null)
%>
<INPUT type=submit class="newsbutton" value="ADD" name=Submit>
<%
else
%>
<INPUT type=submit class="newsbutton" value="ADD" name=Submit disabled>
<%
%>
</form>
<!--T3-->
<table id="categoryTable" border="1" bordercolor="#035C98" width="60%" height="60%" cellpadding="0" cellspacing="0" bgcolor="white">
<tr>
<td colspan="1" class="result"><b>Category Name</b></td>
<td colspan="1" class="result"><b></b></td>
</tr>
<%
if(myApplicationDetails != null)
myApplicationDetails = myLombardiaMgr.getAllApplicationDetails();
Iterator myMainCategories = myApplicationDetails.getMainCategories();
while(myMainCategories.hasNext())
MainCategory aMainCategory = (MainCategory) myMainCategories.next();
if(aMainCategory.getMainCategory().equalsIgnoreCase(mainTopic))
Iterator subTopics = aMainCategory.getSubTopics();
while(subTopics.hasNext())
SubTopic aSubTopic = (SubTopic) subTopics.next();
%>
<form action="NewsUpdate.jsp" method=post>
<tr>
<td class="result"><%=aSubTopic%></td>
<td class="result">
<INPUT type=submit class="newsbutton" value="REMOVE" name=Submit>
<INPUT TYPE=HIDDEN NAME="subCategoryId" VALUE="<%=aSubTopic.getId()%>">
<INPUT TYPE=HIDDEN NAME="subCategoryToBeDeleted" VALUE="<%=aSubTopic%>">
<INPUT TYPE=HIDDEN NAME="mainTopic" VALUE="<%=mainTopic%>">
<INPUT TYPE=HIDDEN NAME="subCategory" VALUE="<%=aSubTopic%>">
</form>
<form action="EditStoryItem.jsp" method=post>
<INPUT TYPE=HIDDEN NAME="subCategory" VALUE="<%=aSubTopic%>">
<INPUT TYPE=HIDDEN NAME="subCategoryId" VALUE="<%=aSubTopic.getId()%>">
<INPUT TYPE=HIDDEN NAME="mainTopic" VALUE="<%=mainTopic%>">
<INPUT type=submit class="newsbutton" value="EDIT" name=Submit>
</form>
<%
if(mainTopic.equalsIgnoreCase("News"))
%>
<td class="result">
<INPUT type="radio" name="newsitem" VALUE="<%=aSubTopic%>" >
<INPUT TYPE=HIDDEN onclick="valbutton(myform);return false;" NAME="selection" >
</td>
<%
%>
</td>
</DL>
</tr>
<%
} // end of if
%>
</table>
<table border="0" bordercolor="#C0C0C0" width="60%" cellpadding="0" cellspacing="0" bgcolor="white">
<tr><td align="right">
<form action="../../../../../../servlet/UploadXmlFiles" method=post>
<% if(myApplicationDetails == null )
System.out.println("******************* selection "+selection);
%>
<INPUT type=submit class="newsbutton" value="UPLOAD" name=Submit disabled>
<%
else
%>
<INPUT type=submit class="newsbutton" value="UPLOAD" name=Submit>
<%
System.out.println("******************* selection "+selection);
%>
</form>
</td>
</tr>
</table>
<!--//T3-->
</td>
</tr>
</table>
</center>
<!--//T2-->
</body>
</html> -
Drawing a Christmas tree w/ nested for loops and from JavaScript to Java
I need help in making this code compatible with Java (I use BlueJ):
It's JavaScript...
Thanks in advance!
<HTML>
<BODY>
<CENTER>
<SCRIPT>
var width=1;
for (i=0; i <= 5 ; i++)
for (x=0; x<=4; x++)
for (y=1; y<=width; y++)
var Number=Math.random()*10;
var Ornament=Math.round(Number);
if (Ornament<=1)
document.write("O");
if (Ornament>=2)
document.write(" X");
document.write("<BR>");
width=width+1;
width=width-2;
</SCRIPT>
</CENTER>
</BODY>
</HTML>What do you mean "compatible with Java"? Java doesn't enter into this at all.
Are you asking how to translate this code to Java?
If so, where you have "<BR>", you'll want a println rather than a print (as in System.out.print).
The second tricky part is centering. The browser handled that for you here.
You'll have to either do it yourself, or find another Java API tool to do it for you.
If I were you I'd look at the API docs for PrintStream.format(), I think it is. It's possible that the %s conversion has a "center" option. Or maybe something else there does.
If there is no textual centering tool, you can build one yourself by using StringBuffer or StringBuilder and padding with spaces, I guess.
Otherwise it should map across pretty easily. -
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) -
Problem with accessing Signed Applet from javascript method
Hi,
I am facing the following problem while accessing Signed Applet from javascript method.
java.security.AccessControlException: access denied (java.io.FilePermission c:/temp.txt read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at FileTest.testPerm(FileTest.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.plugin.javascript.invoke.JSInvoke.invoke(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.plugin.javascript.JSClassLoader.invoke(Unknown Source)
at sun.plugin.com.MethodDispatcher.invoke(Unknown Source)
at sun.plugin.com.DispatchImpl.invokeImpl(Unknown Source)
at sun.plugin.com.DispatchImpl$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.plugin.com.DispatchImpl.invoke(Unknown Source)
I am using jdk1.5 for my development...
Can anyone help to resolve this security issue. Urgent...
Thanks in advance.Hey thanks. I wasn't able to get it to work with that sample but I did find this very similar code that does allow javascript to call JFileChooser in an applets public method.
java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction()
public Object run(){
//do your special code here
return null; //return whatever you want
It seems a bit tempermental in that if you don't select a file quickly, it will hang the browser....no perfect solution but I'm going in the right direction.
Thanks,
Scott -
Calling a java static method from javascript
I am running into issue while calling a java static method with a parameter from javascript. I am getting the following error. Any help is greatly appreciated.
Thx
An error occurred at line: 103 in the jsp file: /jnlpLaunch.jsp
pfProjectId cannot be resolved to a variable
=================================================
// Java static method with one parameter
<%!
public static void CreateJnlpFile(String pfProjectId)
%>
//Script that calls java static method
<script language="javascript" type="text/javascript">
var pfProjectId = "proj1057";
// Here I am calling java method
<%CreateJnlpFile(pfProjectId);%>
</script>
===================================================
Edited by: 878645 on Mar 6, 2012 11:30 PMThanks, Got what you are telling. Right now I have one jsp file which is setting the parameter 'pfProjectId' and in another .jsp I am retrieving it. But I am getting null valuue
for the variable. I am wondering why I am getting null value in the second jsp page?.
Thx
====================================================================
<script language="javascript" type="text/javascript">
// Setting parameter pfProjectId
var pfProjectId = "proj1057";
request.setParameter("pfProjectId", "pfProjectId");
</script>
// Using Button post to call a .jsp that creates jnlp file
<form method=post action="CreateJnlpFile.jsp">
<input type="submit" value="Create JNLP File">
</form>
//Contents of second .jsp file CreateJNLPFile.jsp
String pfProjectId = request.getParameter("pfProjectId ");
System.out.println( "In CreateJnlpFile.jsp pfProjectId " + pfProjectId );
======================================================= -
ANSWER: HOW TO DETECT Java Plugin from JavaScript
I created a new topic because the questions about
how to detect Java Plugin in browsers are scattered
thoughout this forum.
Basically you need to employ two approaches for IE and NS.
In IE you need to try to instantiate a small applet
(not your production applet) in order to see if browser
can do it. if the browser can do it, you can make a
call applet from JavaScript in order to find version of
JRE (as well as a host of other things).
In NS you can write a simple JavaScript which will
interrogate the browser for all plugins installed. Then
ypu can make a desicion whether to pass execution to
the next(or generated) page which hosts your applet,
or ask the user to download/install a plugin.
I ecourage everybody to host a plugin on your site
rather leave default link to it which is generated by
html converter.
In order to run sample,
Prerequisites:
Java Plugin 1.3.
If you have a different version of plugin,
substitute hardcoded plugin version in JavaScript for
value that you have.
1. compile java file
2. put class file in the same directory with html file
3. load html file into the browser.
4. press "Check Java Plugin.." button
5. see it work
6. examine code
7. uninstall plugin
8. repeat steps 1 - 4
9. see it work
10. install plugin.
Sample code follows:
**********************HTML FILE BEGIN***********
<HTML>
<HEAD>
<!-- Generated by Kawa IDE -->
<TITLE>Detect Java Runtime</TITLE>
</HEAD>
<SCRIPT LANGUAGE="JavaScript">
var browsername;
function doNetscape()
for (i=0; i < navigator.plugins.length; i++)
for (j = 0; j < navigator.plugins.length; j++)
if(navigator.plugins[i][j].type == "application/x-java-applet;version=1.3")
alert("You are running Netscape with Java Plugin 1.3.0 - OK");
return;
alert("You are running Netscape\nPlease, install Java Runtime Environment 1.3.0");
function doMicrosoft()
var applet = document.myApplet;
if(applet == null)
alert("You are running Microsoft Browser.\nPlease, install Java Runtime Environment 1.3.0");
return;
var version = applet.getJavaVersion();
if(version == "1.3.0")
alert("You are running IE, Java Plugin 1.3.0 installed - OK");
else
alert("You are running IE, other plugin installed - mybe OK if later that 1.3.0\nYour version: " + version);
function getJava()
var applet = document.myApplet;
if(applet == null)
alert("Please, install Java Runtime Environment");
return;
alert("JRE Version: " + document.myApplet.getJavaVersion());
function checkJavaPlugin()
browsername = navigator.appName;
if(browsername.indexOf("Netscape")!= -1)
browsername="NS";
doNetscape();
else
if(browsername.indexOf("Microsoft")!=-1)
browsername="MSIE";
doMicrosoft();
else
browsername="N/A";
alert("Unknown browser: " + browsername);
</SCRIPT>
<body>
<Strong>Check Java Plugin</strong>
<OBJECT id="myApplet" classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
WIDTH = 1
HEIGHT = 1 >
<PARAM NAME = CODE VALUE = "DetectPluginApplet.class" >
<PARAM NAME="scriptable" VALUE="true" >
<embed type="application/x-java-applet;version=1.3"
code = DetectPluginApplet width = 2 height = 2 MAYSCRIPT = "true" >
</embed>
</EMBED>
</object>
<FORM>
<INPUT TYPE="button" value="Get Plugin Version in IE" onClick="getJava()">
<INPUT TYPE="button" value="Check Java Plugin in NS and IE" onClick="javascript:checkJavaPlugin()">
</FORM>
</BODY>
</HTML>
**********************HTML FILE END***********
***************APPLET FILE BEGIN***********
import java.awt.*;
public class DetectPluginApplet extends java.applet.Applet
public void init()
add(new Label("DetectPluginApplet"));
public String getJavaVersion()
return System.getProperty("java.version");
**************APPLLET FILE END************Try following java script, it works on new browsers (NS 4+, IE5+). For IE you have to enable 'ActiveX objects creation' in security options.
var agt=navigator.userAgent.toLowerCase();
var is_major = parseInt(navigator.appVersion);
var is_nav = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
&& (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
&& (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1));
var is_nav4up = (is_nav && (is_major >= 4));
var is_ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_ie5 = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) );
var is_ie5_5 = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.5") !=-1));
var is_ie6 = (is_ie && (is_major == 4) && (agt.indexOf("msie 6.0") !=-1));
var is_ie5up = (is_ie && (is_major == 4)
&& ( (agt.indexOf("msie 5.0")!=-1)
|| (agt.indexOf("msie 5.5")!=-1)
|| (agt.indexOf("msie 6.0")!=-1) ) );
var pluginDetected = false;
var activeXDisabled = false;
// we can check for plugin existence only when browser is 'is_ie5up' or 'is_nav4up'
if(is_nav4up) {
// Refresh 'navigator.plugins' to get newly installed plugins.
// Use 'navigator.plugins.refresh(false)' to refresh plugins
// without refreshing open documents (browser windows)
if(navigator.plugins) {
navigator.plugins.refresh(false);
// check for Java plugin in installed plugins
if(navigator.mimeTypes) {
for (i=0; i < navigator.mimeTypes.length; i++) {
if( (navigator.mimeTypes[ i].type != null)
&& (navigator.mimeTypes[ i].type.indexOf(
"application/x-java-applet;jpi-version=1.3") != -1) ) {
pluginDetected = true;
break;
} else if (is_ie5up) {
var javaVersion;
var shell;
try {
// Create WSH(WindowsScriptHost) shell, available on Windows only
shell = new ActiveXObject("WScript.Shell");
if (shell != null) {
// Read JRE version from Window Registry
try {
javaVersion = shell.regRead("HKEY_LOCAL_MACHINE\\Software\\JavaSoft\\Java Runtime Environment\\CurrentVersion");
} catch(e) {
// handle exceptions raised by 'shell.regRead(...)' here
// so that the outer try-catch block would receive only
// exceptions raised by 'shell = new ActiveXObject(...)'
} catch(e) {
// Creating ActiveX controls thru script is disabled
// in InternetExplorer security options
// To enable it:
// a. Go to the 'Tools --> Internet Options' menu
// b. Select the 'Security' tab
// c. Select zone (Internet/Intranet)
// d. Click the 'Custom Level..' button which will display the
// 'Security Settings' window.
// e. Enable the option 'Initialize and script ActiveX controls
// not marked as safe'
activeXDisabled = true;
// Check whether we got required (1.3+) Java Plugin
if ( (javaVersion != null) && (javaVersion.indexOf("1.3") != -1) ) {
pluginDetected = true;
if (pluginDetected) {
// show applet page
} else if (confirm("Java Plugin 1.3+ not found, Do you want to download it?")) {
// show install page
} else {
// show error page
} -
How to call java program from javascript
Hi,
I have an java program which will transform one xml to another xml using XSLT.
I want to call this java program from Javascript? Is this possible? Please suggest me.
Thanks,
Gopalis it not possible?
do i have to refresh the page and read in the values like...
<%
String ename = request.getParameter( "EmployeeName");
session.setAttribute( "ename", ename);
%>and then call the class from here?
looking around ive come across ajax but i dont know how to use it and what you need to install and if its compatable with tomcat and jsp?
is ajax better or not really worth it?
i have anything up to 100 fields that need saving at one save click -
Access Java object from Javascript
Hi
I'm trying to invoke a Java object from Javascript (scriptengine and all that).
I want to add scripting features to a GeneXus Java generated app... and I have very basic skills on java too. Sorry for that ;o).
This is the java code to pass "params" to the scriptengine:
engine.put("remoteHandle",remoteHandle);
engine.put("context", context); The remoteHandle (int) and context (com.genexus.ModelContext) pass trough all the gx-java generated programs.
This javascript works fine:
importClass(Packages.uftestjs);
new uftestjs(remoteHandle).execute( ) ;The remoteHandle conversion is ok (javascript-number to int). The context is optional.
But if I want to pass context:
importClass(Packages.uftestjs);
new uftestjs(remoteHandle, context).execute( ) ;Fails with this:
"javax.script.ScriptException: sun.org.mozilla.javascript.internal.EvaluatorException: Java constructor for 'uftestjs' with arguments 'number,javax.script.SimpleScriptContext' not found."
Obviously, no conversion is possible with context (javax.script.SimpleScriptContext to com.genexus.ModelContext).
There is some way to reference de original context, by the object Id??? or something like that???
Thanks in advance for any replies!!!
Greetings from Chile. (I hope you can understand my english!)Hi
Well, since this topic is about java programming I think the place is right here.
(I use some tricks to embed java statements in genexus objects...)
I will try to get some help at Artech (GX) on how to build something... to get the conversion needed.
But they are not focussed on support this kind of questions.
Anyway, I want to know: do I can to reference an object by the objId?
I want to code something like this:
com.genexus.ModelContext context =
(com.genexus.ModelContex)getTheObjectFromTheJVM(theObjectId);(powered by google translator, ha!) -
Access java from javascript in firefox
Hi,
I am trying to access java method from javascript.
It works fine with ie, but firefox somehow brings up the error
saying the method defined in java is not a function.
I am calling like.
document.applets["myapp"].soundAlarm();
I have put MAYSCRIPT in the applet tag.
still not works.
Does anyone have idea ?
ThanksTry with
document.myapp.soundAlarm();I assume that the name attribute of the APPLET is myapp.
Note the MAYSCRIPT is useless in your context. MAYSCRIPT is used when from Java you need to access the JSObject.
See http://www.rgagnon.com/topics/java-js.html for examples.
Bye. -
Help with calling java functions from javascript
I am using javax.script to interpret javascript from a java applet. it loads the js file into a string, and then does engine.eval(script_string). My question is, how would I make functions in the class file that are available to javascript?
Update: Instead of that, I am loading a js script that will contain all of the usable functions. Here it is:
//core.js for Javasphere 0.31
var pkgs = new JavaImporter(java.lang, java.lang.System, java.awt);
with(pkgs) {
function Abort(msg) {
var graph = new Graphics();
g = graph.getgraphics();
g.drawString(msg, 20, 20);
}When I do engine.eval("Abort(\"something\")"); it throws this error:
javax.script.ScriptException: sun.org.mozilla.javascript.internal.EvaluatorException: error instantiating (0): class java.awt.Graphics is interface or abstract (<Unknown source>#8) in <Unknown source> at line number 8Eggbertx, let's start from scratch if you don't mind. Say you have this Applet
pubic class MyApplet extends Applet
String message;
//CALL THIS METHOD FROM JAVASCRIPT
public void setMessage(String msg)
message = msg;
// this saves you from having
// to call getGraphics() from JavaScript
repaint();
public void paint(Graphics g)
g.drawString(message, 10, 30);
}Then in your HTML file you may have something like this:
<input type="text" id="msg" value=""></input>
<input type="button" value="Set Message" onclick="setAppletMessage()"></input>
<applet id="myApplet" code="MyApplet.class" width="400" height="100"></applet>And in the JavaScript file:function setAppletMessage()
var msg = document.getElementById("msg").value;
document.myApplet.setMessage(msg);
}This is about all you really need to do. See how the Graphics object is no longer in your .js file?
Note: You may run into other difficulties in getting this code to work because of browser, security, or some other pain-in-the-neck issues, but this is the idea.
Eggbertx, I see you added a star to my first post and I think you should take that off because:
1. <tt>Component</tt> is abstract... so you can not call the <tt>new</tt> operator.
2. The call <tt>component.getGraphics()</tt> is not going to work either, because <tt>component</tt> was never created. -
Call Java method from JavaScript
Hi,
I have a Java class called abc.java and in that I have a method called assignValue(String value).
I need to call this method, assignValue() , from JavaScript.
Is there a way to call a Java method from JavaScript.
Any help is greatly appreciated.
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.
My Page1.class file is as follows
* Page1.java
package a1;
import ....
public class Page1 extends AbstractPageBean {
public void valset(int val) {
}my jsp file "Page1.jsp" is as follows:
<?xml version="1.0" encoding="UTF-8"?>
<jsp:root version="1.2" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:ui="http://www.sun.com/web/ui">
<jsp:directive.page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"/>
<f:view>
<ui:page binding="#{Page1.page1}" id="page1">
<ui:html binding="#{Page1.html1}" id="html1">
<ui:head binding="#{Page1.head1}" id="head1">
<ui:link binding="#{Page1.link1}" id="link1" url="/resources/stylesheet.css"/>
</ui:head>
<ui:body binding="#{Page1.body1}" id="body1" style="-rave-layout: grid">
<ui:form binding="#{Page1.form1}" id="form1">
<applet code="Page1.class" name="Page1" width="1100" height="600">
</applet>
<ui:button action="#{Page1.button1_action}" binding="#{Page1.button1}" id="button1" onMouseOver="form1.Page1.valset(1);"
style="left: 239px; top: 192px; position: absolute" text="Button"/>
</ui:form>
</ui:body>
</ui:html>
</ui:page>
</f:view>
</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? -
How can I decode Japanese character using java from JavaScript escape() function
Hi:
I have an application which supports Japanese character. I am using JavaScript escape() function to encode the text field before I posted it through web server and then I will just convert it into hex number to decode it through an Integer. It works fine for the character between ascii 1-255. However, it faild on all the double bytes character. All the unicode has the format of "%uXXXX" after it is escaped from JavaScript. How can I resolve the decoding problem?
Thank,
DavidPlease use 'encodeURI()', though it is supported only IE after 5.5.
I'm not sure Netscape.
Thanks,
Katsumi
dwang <[email protected]> wrote:
Hi:
I have an application which supports Japanese character. I am using JavaScript
escape() function to encode the text field before I posted it through
web server and then I will just convert it into hex number to decode
it through an Integer. It works fine for the character between ascii
1-255. However, it faild on all the double bytes character. All the
unicode has the format of "%uXXXX" after it is escaped from JavaScript.
How can I resolve the decoding problem?
Thank,
David
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