AJAX Call from JavaScript in Java

if(window.XMLHttpRequest)//non IE
{
    req = new XMLHttpRequest();
    try
    {
         req.open("GET",url,true);
         req.onreadystatechange=setInTextField;
    }
    catch(e)
    {
         alert("cannot connect to server");
    }
    req.send(null);
}
else if(window.ActiveXObject)//IE
{
    try
    {
         req=new ActiveXObject("Msxml2.XMLHTTP.3.0");
    }
    catch(e)
    {
         req=new ActiveXObject("Microsoft.XMLHTTP");
    }
    if(req)
    {
         req.open("GET",url,true);
         req.onreadystatechange=setInTextField;
         req.send(null);
    }
}

Disable any element in a HTML page by JavaScript

document.getElementById('id').disabled=true;

JavaScript Text Field formatter for input money

function moneyonly(e)
{
    var unicode=e.charCode? e.charCode : e.keyCode;
    var st = document.getElementById("amount").value;
//alert(unicode)
    if (unicode== 8)
    {
        return true;
//if the key isn't the backspace key (which we should allow)
    }
    else if(unicode == 46)
    {

        if(st.toString().indexOf(".",0) != -1)
        {
            return false;
        }

    }
    else if (unicode<48||unicode>57) //if not a number
    {

        return false //disable key press
    }
    else if(st.toString().indexOf(".",0) != -1)
    {
        if(st.toString().length - st.toString().indexOf(".",0) > 2)
        {
            return false;
        }
    }

    return true;
}

Trim function in JavaScript

function trimThis(value1)
{
    value1= value1.replace(/^\s+|\s+$/, '');
    return value1;
}

Set Image Background in a JPanel

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.swing.*;

public class BackgroundImage {
public static void main(String[] args) throws IOException {
BufferedImage image = javax.imageio.ImageIO.read(new File("C:\\WINDOWS\\Web\\Wallpaper\\Azul.jpg"));
ImageBackgroundPanel imp = new ImageBackgroundPanel(image);

// Set layout and add components to imp as desired.

JFrame f = new JFrame();
JTextField txtField=new JTextField(20);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(imp);
imp.add(txtField);
f.setSize(400,400);
f.setLocation(200,200);
f.setVisible(true);
}
}

class ImageBackgroundPanel extends JPanel {
BufferedImage image;

ImageBackgroundPanel(BufferedImage image) {
this.image = image;
}

protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, this);
}
}