Java

Processing JSP-Form using Servlet using AJAX Post method

20-Oct-10 1:24

Well I understand that, which is why I suggested it to the OP!

Just say 'NO' to evaluated arguments for diadic functions! Ash

khurram_shahzad17-Oct-10 7:17

17-Oct-10 7:17

I am trying to process data by servlet sended by jsp form using AJAX..... with 'GET' method its working okey ... but using 'POST' method to do this creating problem that onreadystatechage condition not exectue at (xmlhttp.readyState==4 && xmlhttp.status==200)

xmlhttp.onreadystatechange=function() {
                    if (xmlhttp.readyState==4 || xmlhttp.status==200) {
                        alert("state=4 OR 200"); //for testing...
                        //document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
                        document.getElementById("TextChatHistory").value = xmlhttp.responseText;
                    }
}

i tryed to solve this too much .... but i cant .... Any one plz help me ..... THANK ...

COMPLETE PROGRAM CODE IS GIVEN BELOW,

JSP_CODE

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%--@page import="java.util.Timer.*, java.util.TimerTask.*"
    Timer timer;
--%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>

        <script type="text/javascript" >
            function AjaxFunction() {
                xmlhttp = null;
                if(window.XMLHttpRequest) {
                    xmlhttp = new XMLHttpRequest();
                    //alert("alert_Browser");
                } else {
                    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
                    //alert("alert_ActiveX");
                }
                xmlhttp.onreadystatechange=function() {
                    if (xmlhttp.readyState==4 || xmlhttp.status==200) {
                        alert("state=4 OR 200"); //for testing...
                        //document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
                        document.getElementById("TextChatHistory").value = xmlhttp.responseText;
                    }
		}
                xmlhttp.open("POST", "TextChat", true);
                var Parameter_MsgSType = "msgText=" + document.getElementById("msgText").value;
                alert(Parameter_MsgSType);  //for testing...
                xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
                xmlhttp.setRequestHeader("Content-lenght", Parameter_MsgSType.lenght);
                xmlhttp.setRequestHeader("Connection", "close");
                xmlhttp.send(Parameter_MsgSType);
                alert("Ajax fuinction finished");   //for testing...
            }
        </script>

    </head>
    <body>
        <!--<h1>Hello JSP!</h1>-->
        <div id="myText"></div> <!--for testing...-->
        <form name="TextChat" method="post" action="" >
            <textarea cols="50" rows="10" readonly id="TextChatHistory" name="TextChatHistory" >TextChat History</textarea>
            <br />
            <textarea cols="50" rows="3" id="msgText" >Enter Text</textarea>
            <select name="SentToType">
                <option value="p">Presentor</option>
                <option value="h">Host</option>
                <option value="a">Attendee</option>
                <option value="l">All</option>
            </select>
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
            <input type="submit" value="SEND" onclick="AjaxFunction()" />
        </form>
    </body>
</html>

help required

Nima Dorji15-Oct-10 5:30

Nima Dorji

15-Oct-10 5:30

give me solution of Round robin scheduling code in java

Re: help required

Richard MacCutchan15-Oct-10 6:00

Swing equivalent in java mobile

15-Oct-10 6:00

Ask yourself this: Where would be a good place to search for something that fits my requirements?

This forum tends not to hand out ready made solutions on demand, try doing some research first, and come back here when you have a technical query.

Just say 'NO' to evaluated arguments for diadic functions! Ash

trioum14-Oct-10 8:03

trioum

14-Oct-10 8:03

what is the equivalent package on swing in j2me

Trioum

Re: Swing equivalent in java mobile

Nagy Vilmos14-Oct-10 21:51

Nagy Vilmos

14-Oct-10 21:51

J2ME has within it's framework its own set of controls that are desogned for generic mobile devices. If you are targetting a specific platform then you will also find that there are platform specific UI components. Check the JavaDoc for details.

Panic, Chaos, Destruction.
My work here is done.

or "Drink. Get drunk. Fall over." - P O'H

Problem in learning AJAX with PHP

khurram_shahzad13-Oct-10 11:04

Re: Problem in learning AJAX with PHP

13-Oct-10 11:04

hi ...
i m trying to make this me first simple AJAX example using PHP that shows message from PHP on clicking Button in HTML page .... but this case some prolem ... that is when click on button to show message then nothing is happen .... is also check WAMP ... so any idea or suggestion !!!!

HTML CODE IS,

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>MyFirstAJAXProram</title>



</head>

<body>
<script type="text/javascript">

function JavaFunction() {
	var xmlhttp;
	<!--Getting XMLHttpRequest OR Active depends on browser support...-->
	if(window.XMLHttpRequest) {
		xmlhttp = new XMLHttpRequest();
	} else {
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	xmlhttp.onreadystatechange=function() {
		if(xmlhttp.readystate == 4) {
			document.timerForm.time.value = xmlhttp.responseText;
		}
	}
	xmlhttp.open("GET", "phpfile.php", true);
	xmlhttp.send(null);
}
</script>
<form name="timerForm">
<input type="button" onclick="JavaFunction()"; />
Time: <input type="text" id="timer" name="time" value="00:00:00" readonly="readonly" />
</form>
</body>
</html>

HERE's PHP CODE,

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<body>
<?
echo("KHURRAM SHAHZAD");
?>
</body>
</html>

Richard MacCutchan13-Oct-10 11:43

Re: Problem in learning AJAX with PHP

13-Oct-10 11:43

khurram_shahzad wrote:
so any idea or suggestion

Since this is the Java forum I suggest you post this elsewhere - possibly either JavaScript or PHP.

Just say 'NO' to evaluated arguments for diadic functions! Ash

khurram_shahzad14-Oct-10 5:57

Dividing a text file into variable size chunks using Rabin fingerprint algorithm in java

14-Oct-10 5:57

Oh i c ...... Smile | :)

LOKESHWARI13-Oct-10 2:14

LOKESHWARI

13-Oct-10 2:14

Help me with java code for dividing a text file into variable size chunks using Rabin finger print and sliding window technique..
Consider a file .
A fixed width sliding window (48 bytes long) will be moving along the contents of the file.

The fingerprint of the contents of the window is found using Rabin finger print algorithm

f is fingerprint( Hash value) of the contents of file
D be the average chunk size,
r be zero

Position where f mod D =r satisfies at that position chunk a file.. Advance the sliding window Continue this till the end of file.

Re: Dividing a text file into variable size chunks using Rabin fingerprint algorithm in java

Cedric Moonen13-Oct-10 3:13

Cedric Moonen

13-Oct-10 3:13

Where are you stuck exactly ? Nobody here will send you the full code of your program (specially when it looks like homework question).

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

Developing a Multitenant Application in Java

sangeetha_spss12-Oct-10 3:03

sangeetha_spss

12-Oct-10 3:03

Hi all,
I wish to develop a multitenant data analytical application using Netbeans. Could anyone suggest me the procedure or a sample multitenant application,which could be more helpful to for me to proceed further.
Please help me.

Thanks for considering my request..

sangita

Re: Developing a Multitenant Application in Java

Richard MacCutchan12-Oct-10 5:46

Re: Chossing a best option

12-Oct-10 5:46

Please do not post the same question in multiple forums.

Just say 'NO' to evaluated arguments for diadic functions! Ash

Chossing a best option

krishnareddy03612-Oct-10 1:46

krishnareddy036

12-Oct-10 1:46

Hi,

I have 3+ years of experience as a software Engineer in Java,J2EE concepts ,
developing the web-application and ERP domain modules,
I have currently offer in two companies for separate in two different domain
projects. Below are the details...

Offer 1 - The role is of an engineer in developing the web-applications
using J2EE concepts (springs, hibernate,and JSF) Client --Reddy Labas

Offer 2 - The role is of an engineer in developing the projects using the
tool called Identity Management (J2EE concepts as backend) Client-JPMorgan.

I am little confused to choose which offer and how it is going to be the
best thing in my career /future (job Resources) view.

Am seeking your valuable inputs on which one would be a better offer.

Thank you!

DaveAuld12-Oct-10 1:56

DaveAuld

12-Oct-10 1:56

Don't post in multiple location. It makes it difficult to keep related discussion together, and you could end up with duplication or 2 discussions ongoing about the same thing.

This is currently being answered here;

http://www.codeproject.com/Questions/117507/Best-Option-for-Choosing.aspx[^]

Dave
Find Me On: Web|Facebook|Twitter|LinkedIn

CPRepWatcher now available as Packaged Chrome Extension, visit my articles for link.

Re: Chossing a best option

jschell15-Oct-10 8:38

jschell

15-Oct-10 8:38

krishnareddy036 wrote:
Offer 1 - The role is of an engineer in developing the web-applications
using J2EE concepts (springs, hibernate,and JSF) Client --Reddy Labas

Per this description you would be using Java and associated common frameworks and idioms.

krishnareddy036 wrote:
Offer 2 - The role is of an engineer in developing the projects using the
tool called Identity Management (J2EE concepts as backend) Client-JPMorgan.

Per this description you would be using a specific vendor tool.

Thus in terms of a career in programming the first is better.

However there could be other criteria.

For example do you want to remain a programmer? If not then which position seems to allow a better chance to move into management?

Another example do you want to use other languages? If yes then which job is more likely to allow you to do that, for example is one more likely to allow you to learn SQL?

You might also want to look into what stage the project is on that you would be working on. Maintenance programming on an existing project for someone with your experience might not be as enjoyable as a new project or one that is relatively new. Along those lines you might ask, of both companies, what additional programming possibilities might exist in a year from now.

calling servlet in background from jsp

khurram_shahzad10-Oct-10 7:16

Re: calling servlet in background from jsp

10-Oct-10 7:16

when we call servlet from a JSP page .. explorer/program moves to servlet page .... Such in my scenareo i have JSP form that on submiting call servlet to retrieve data from XML .. But problem is that . i like that on submitin form servlet runs in background without changing page to servlet page ... like thread in background .... SO PLZ ANY IDEA OR SUGGESTION !!!!
THANKS T ALL HELPERS ...

Richard MacCutchan10-Oct-10 8:50

Re: calling servlet in background from jsp

10-Oct-10 8:50

khurram_shahzad wrote:
SO PLZ ANY IDEA OR SUGGESTION !!!!
THANKS T ALL HELPERS ...

Don't shout!

Just say 'NO' to evaluated arguments for diadic functions! Ash

Member 324727611-Oct-10 21:45

Member 3247276

11-Oct-10 21:45

From what I think I read in your question, you want to do Ajax. This will allow you to put a request out to the servlet and process the result with Javascript inside the HTML without changing the actual browser page. Try jQuery to get this to work.

If you do not know what Ajax or jQuery are, you first need to do some reading. There is enough info on this on the internet.

Canvas inside applet

ekba899-Oct-10 16:14

ekba89

9-Oct-10 16:14

Hi i've created a canvas for game and an applet which contains this canvas and can communicate with my database. But when canvas goes into the game loop my applet doesn't respond anything i can't even close it. Also in my canvas' constructor method i make it's background black but it doesn't work either. Here is the code for 2 classes. And for now game loop is empty but i tried it with simple game loop which runs at 25fps and sleeps when needed.

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferStrategy;

public class GameCanvas extends Canvas implements Runnable{
    private Graphics2D graphics;
    private BufferStrategy bufferStrategy;
    private boolean gameRunning;
    
    public GameCanvas(){
        setBackground(Color.black);
        setSize(300, 300);
    }
    
    public void initGame(){
        createBufferStrategy(2);
        bufferStrategy = getBufferStrategy();
        graphics = (Graphics2D)this.getBufferStrategy().getDrawGraphics();
        gameRunning = true;
        Thread t = new Thread(this);
        t.run();
    }
    
    public void run(){
        gameLoop();
    }
    
    public void gameLoop(){
        while(gameRunning){
            
        }
    }
    
    public void update(){
        
    }
    
    public void drawScreen(){
        graphics.clearRect(0, 0, this.getWidth(), this.getHeight());
        //some drawings;
        if(!bufferStrategy.contentsLost())
            bufferStrategy.show();
    }
}

import java.sql.*;
import javax.swing.JApplet;


public class DatabaseApplet extends JApplet{
	Connection con;
	
	static{
		try{
			Class.forName("com.mysql.jdbc.Driver").newInstance();
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	
	String url = "jdbc:mysql://127.0.0.1:3306/players";
	String name = "root";
	String password = "root";
	GameCanvas gameCanvas;
	
	public void init(){
		setSize(300, 300);
		add(gameCanvas = new GameCanvas());
		try{
			con = DriverManager.getConnection(url, name, password);
		}catch(SQLException e){
			e.printStackTrace();
		}
	}
	
	public void start(){
		gameCanvas.initGame();
	}
	
	public void destroy() {
		try{
			con.close();
		}catch(SQLException e){
			e.printStackTrace();
		}
	}
	
}

Richard MacCutchan9-Oct-10 21:54

9-Oct-10 21:54

public void gameLoop(){
    while(gameRunning){

    }
}

I cannot see how you get out of this loop, nor how it ever releases control.

Just say 'NO' to evaluated arguments for diadic functions! Ash

ekba8910-Oct-10 5:32

ekba89

10-Oct-10 5:32

First of all thanks for the answer. I'm running this game loop in another thread so shouldnt operating system take care of giving other threads clock time? And as i said before if i do something like Thread.sleep(freeTime) or Thread.yield() it doesn't work either. I tried it inside html and surprisingly it makes background black there. Also can you suggest how can i make a canvas game inside applet because there must be a game loop similar to this.

Richard MacCutchan10-Oct-10 8:49

10-Oct-10 8:49

Well I've copied your code and run it up in my IDE and that little closed loop really seems to block everything. I think you will need to redesign how you are doing this, although I can't offer any suggestions about how to do this in an applet without going back to the Tutorials[^].

Just say 'NO' to evaluated arguments for diadic functions! Ash