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mchl_the_citizen
M.Ed., MSCIS, A+ Certification
I can t get the following code to show anything after inputting and clicking the button that appears.I can t find a reason why. Any help?
Here is part one of the code. It sets up the website and asks for Javascript to enact.
<!DOOCTYPE HTML>
<HTML lang="en">
<HEAD>
<TITLE>Webville Tunes</TITLE>
<meta charset = "utf-8">
<script src="playlist.js"></script>
<link rel="stylesheet" type="text/css" href="playlist.css">
</HEAD>
<BODY>
<form>
<input type="text" id="songTextInput" size="40" placeholder="Song name">
<input type="button" id="addButton" value="Add Song">
</form>
<ul id="playlist">
</ul>
</BODY>
</HTML>
Here is the JavaScript on a second page:
window.onload = init;
function init() {
var button = document.getElementById("addButton");
button.onclick = handleButtonClick;
}
function handleButtonClick() (
var textInput = documentgetElementByID("songTextInput");
var songName = textInput.value;
var node = document.createElement("LI");
var textnode = document.createTextNode("Blue Suede Shoes");
node.appendChild(textnode);
document.getElementByID("playlist").appendChild(node);
li.innerHTML = songName;
var ul = document.getElementById("playlist");
ul.appendChild(li);
}
Any help would be great!
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Here is an example of some simple code:
import static java.lang.Integer.toBinaryString;
public class BitwiseOps {
public static void main(String[] args){
int indicators = 0b1111_0000_0010_1111;
int selectBit3 = 0b000_0011_1111_1110;
// Try the bitwise AND to select the third bit in indicators
System.out.println("indicators = " + toBinaryString(indicators));
System.out.println("selectBit3 =" + toBinaryString(selectBit3));
indicators &= selectBit3;
System.out.println("indicators & selectBit3 = " + toBinaryString(indicators));
// Try the biwise OR to switch the third bit
int indicators = 0b1111_0000_0010_1111;
System.out.println("\nindicators = " + toBinaryString(indicators));
System.out.println("selectBit3 = " + toBinaryString(selectBit3));
// Try the bitwise OR to switch the third bit on
indicators |= selectBit3;
System.out.println("indicators | selectBit3 = " + toBinaryString(selectBit3));
// Now switch the third bit off again
indicators &= -selectBit3;
System.out.println("\nThe third bit in the previous value of integraters has been turned"
+ "off = " + toBinaryString(indicators));
System.out.println("indicators | selectBit3 = " + toBinaryString(selectBit3));
}
}
I always get an error with the original declaration of "int indicators". Netbeans 7.2, which I have used to run this code, says that it does not support this type of declaration. Is there any type of workaround or solution? What am I doing wrong?
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I need to generate a series of random capital characters that are not vowels. I have created the following code but the compiler (Netbeans 6.9) always gives me the following error:
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - illegal start of expression
This error refers the first 'if' statement in the code. The rest of it appears to be OK. Here is the code:
public class RandomStringGenerator {
public static void main(String[] args) {
char symbol = 'A';
symbol = (char)(128.0*Math.random());
if (symbol > 'A' ?? symbol <= 'D' ) {
System.out.println("Here is the letter: " + symbol);
} else if (symbol>= 'F' && symbol <= 'H'){
System.out.println("Here is the letter: " + symbol);
} else if (symbol >= 'J' && symbol <= 'N') {
System.out.println("Here is the letter: " + symbol);
} else if (symbol >= 'P' && symbol <= 'D') {
System.out.println("Here is the letter: " + symbol);
} else if (symbol>= 'B' && symbol <= 'D') {
System.out.println("Here is the letter: " + symbol);
} else {
System.out.println("The program only generated a vowels. Please try again.");
}
}
}
Can anyone tell me what I am doing wrong?
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I have found the following base program from Ian Darwin:
package org.me.mylib;
/**
*
* @author Ian Darwin
*/
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.geom.Point2D;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;
//import com.darwinsys.util.Debug;
/** Simple Graphing program.
* @author Ian F. Darwin, http://www.darwinsys.com/
* @version $Id: Grapher.java,v 1.20 2008/10/06 15:44:34 ian Exp $
*/
public class Grapher extends JPanel {
private static final long serialVersionUID = -1813143391310613248L;
/** Multiplier for range to allow room for a border */
public final static double BORDERFACTOR = 1.1f;
/** The list of Point points. */
protected List<Point2D> data;
/** The minimum and maximum X values */
protected double minx = Integer.MAX_VALUE, maxx = Integer.MIN_VALUE;
/** The minimum and maximum Y values */
protected double miny = Integer.MAX_VALUE, maxy = Integer.MIN_VALUE;
/** The range of X and Y values */
protected double xrange, yrange;
public Grapher() {
data = new ArrayList<Point2D>();
figure();
}
/** Set the list data from a list of Strings, where the
* x coordinate is incremented automatically, and the y coordinate
* is made from the String in the list.
*/
public void setListDataFromYStrings(List<String> newData) {
data.clear();
for (int i=0; i < newData.size(); i++) {
Point2D p = new Point2D.Double();
p.setLocation(i, java.lang.Double.parseDouble(newData.get(i)));
data.add(p);
}
figure();
}
/** Set the list from an existing List, as from GraphReader.read() */
public void setListData(List<Point2D> newData) {
data = newData;
figure();
}
/** Compute new data when list changes */
private void figure() {
// find min & max
for (int i=0 ; i < data.size(); i++) {
Point2D d = (Point2D)data.get(i);
if (d.getX() < minx) minx = d.getX();
if (d.getX() > maxx) maxx = d.getX();
if (d.getY() < miny) miny = d.getY();
if (d.getY() > maxy) maxy = d.getY();
}
// Compute ranges
xrange = (maxx - minx) * BORDERFACTOR;
yrange = (maxy - miny) * BORDERFACTOR;
//Debug.println("range", "minx,x,r = " + minx +' '+ maxx +' '+ xrange);
//Debug.println("range", "miny,y,r = " + miny +' '+ maxy +' '+ yrange);
}
/** Called when the window needs painting.
* Computes X and Y range, scales.
*/
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Dimension s = getSize();
if (data.size() < 2) {
g.drawString("Insufficient data: " + data.size(), 10, 40);
return;
}
// Compute scale factors
double xfact = s.width / xrange;
double yfact = s.height / yrange;
// Scale and plot the data
for (int i=0 ; i < data.size(); i++) {
Point2D d = (Point2D)data.get(i);
double x = (d.getX() - minx) * xfact;
double y = (d.getY() - miny) * yfact;
Debug.println("point", "AT " + i + " " + d + "; " +
"x = " + x + "; y = " + y);
// Draw a 5-pixel rectangle centered, so -2 both x and y.
// AWT numbers Y from 0 down, so invert:
g.drawRect(((int)x)-2, s.height-2-(int)y, 5, 5);
}
}
@Override
public Dimension getPreferredSize() {
return new Dimension(150, 150);
}
public static void main(String[] args) throws IOException {
final JFrame f = new JFrame("Grapher");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Grapher grapher = new Grapher();
f.setContentPane(grapher);
f.setLocation(100, 100);
f.pack();
List<Point2D> data = null;
if (args.length == 0)
data = org.me.mylib.Grapher.class.getName();
else {
String fileName = args[0];
if ("-".equals(fileName)) {
data = GraphReader.read(new InputStreamReader(System.in), "System.in");
} else {
org.me.mylib.Grapher.class.getField(fileName);
}
}
grapher.setListData(data);
f.setVisible(true);
}
}
I need to add more detail to get it to show lines and there are some mistakes because of my changes in the program. Can anybody help me?
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