Open Education – Page 268

Apr 26

JavaScript Code #Programming Code Examples #Javascript #JavaScript

By Author-Check- Article-or-Video in FromSitesTree.com

                var browser=navigator.appName;
                var b_version=navigator.appVersion;



<a href="http://www.justetc.net" target="_blank">
<img border="0" alt="hello" src="b_pink.gif" id="b1" width="26" height="26" onmouseover="mouseOver()" onmouseout="mouseOut()" />



Place the following code under script tag/in a javascript file

function mouseOver()
{
   document.getElementById("b1").src ="b_blue.gif";
}

function mouseOut()
{
   document.getElementById("b1").src ="b_pink.gif";
}


<map name="planetmap">

<area shape ="rect" coords ="0,0,82,126"
onMouseOver="writeText('You are over the target area')"
href ="target.htm" target ="_blank" alt="target" />

var t1=setTimeout("document.getElementById('id1').value='2 seconds!'",2000);
var t2=setTimeout("document.getElementById('id1').value='4 seconds!'",4000);
var t3=setTimeout("document.getElementById('id1').value='6 seconds!'",6000);

Direct Instance: 

pObj=new Object();
pObj.firstname="John";
pObj.lastname="Doe";
pObj.age=50;
pObj.eyecolor="blue";

document.write(pObj.firstname + " is " + pObj.age + " years

function car(brand,make,model)
{
this.brand=brand;
this.make=make;
this.model=model;
}
var myCar=new car("Honda","2009","Accord");
document.write(myCar.brand +  myCar.make + myCar.model );

try
{
}
catch(err)
{
}


Under script tag/javascript file:

onerror=handleErr;
var alertTxt = "" 

function handleErr(msg, url, l)
{
   alertTxt = "Error Information:.nn";
   alertTxt += msg + "n";
   alertTxt += url + "n";
   alertTxt += l + "nn";
   alertTxt += "Click OK to continue.nn";
   alert(alertTxt);
   return true;
}


var x;
var myFriends= new Array();
myFriends[0] = "Shafiq";
myFriends[1] = "Rafiq";
myFriends[2] = "Abba";
myFriends[3] = "Amma";

for (x in myFriends)
{
   document.write(myFriends[x] + "
");
}

var d = new Date();
theDay=d.getDay();
switch (theDay)
{
case 5:
  document.write("Friday");
  break;
case 6:
  document.write("Saturday");
  break;
case 0:
  document.write("Sunday");
  break;
}

   var pattern = new RegExp("e","g");
   do
   {
     result=pattern .exec("This is the line where the regular expression will be searched on");
     document.write(result);
   }
   while (result!=null)

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10182
Categories:Programming Code Examples, Javascript, JavaScript
Tags:JavascriptJavaScript
Post Data:2017-01-02 16:04:23

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Shop Online: https://www.ShopForSoul.com/
Medium: https://medium.com/@SayedAhmedCanada

Apr 26

Javascript : Miscellaneous Code #Programming Code Examples #Javascript #JavaScript

By Author-Check- Article-or-Video in FromSitesTree.com

                var browser=navigator.appName;
                var b_version=navigator.appVersion;

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10180
Categories:Programming Code Examples, Javascript, JavaScript
Tags:JavascriptJavaScript
Post Data:2017-01-02 16:04:23

Apr 26

GetElementsByName an example: Checkbox #Programming Code Examples #Javascript #JavaScript

By Author-Check- Article-or-Video in FromSitesTree.com

<html>

	<head>
		<script type="text/javascript">
			function getElements()
			  {
			  var x=document.getElementsByName("myInput[]");
			  alert(x.length);
			  alert(x[0].value);
			  alert(x[1].value);
			  alert(x[2].value);


			  }
		</script>
</head>

<body>
	<input name="myInput[]" type="checkbox" size="20" value='10'/>10 


	<input name="myInput[]" type="checkbox" size="20" value='20' />20

	<input name="myInput[]" type="checkbox" size="20" value='30' />30

	<br />
	<input type="button" onclick="getElements()" value="How many elements named 'myInput'?" />
</body>

</html>

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10179
Categories:Programming Code Examples, Javascript, JavaScript
Tags:JavascriptJavaScript
Post Data:2017-01-02 16:04:23

Apr 26

JavaScript Form Validation: Validate a Form Collecting Credit Card Information #Programming Code Examples #Javascript #JavaScript

By Author-Check- Article-or-Video in FromSitesTree.com


	function validateCollectPaymentInformationForm()
	{
		var method, name, number, expiry, errMsg
		
		errMsg = "";
		
		method = document.getElementById('paymentMethod');
		name =   document.getElementById('txtCCName');
		number = document.getElementById('txtCCNumber');
        
		if (method.value == "" || method.value == "0" || method.value == null){
			
			errMsg = "Please select a payment method n";
			
			
		}
		
		if (name.value == "" || name.value == null){
			
			errMsg = errMsg + 'Please write down your name  n';
			
			
		}
		
		if (number.value == "" || number.value == null){
			
			errMsg = errMsg + 'Please provide credit card number  n';
				
		}else if (number.value.length  0 ){
			alert(errMsg);
			method.focus();
			return false;			
		}else{		
			return true;
		}		
		return false;	
	}


	function validateCollectPaymentInformationForm()
	{
		var method, name, number, expiry, errMsg
		
		
		
		method = document.getElementById('paymentMethod');
		name =   document.getElementById('txtCCName');
		number = document.getElementById('txtCCNumber');
        
		if (method.value == "" || method.value == "0" || method.value == null){
			alert('Please select a payment method');
			method.focus();
			return false;
			
		}
		
		if (name.value == "" || name.value == null){
			alert('Please write down your name');			
			name.focus();
			return false;
			
		}
		
		if (number.value == "" || number.value == null){
			alert('Please provide credit card number');			
			number.focus();
			return false;			
		}else if (number.value.length < 16 ){
			alert('Invalid card number');			
			number.focus();
			return false;	
		}
		
		
			
		return true;
	}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10176
Categories:Programming Code Examples, Javascript, JavaScript
Tags:JavascriptJavaScript
Post Data:2017-01-02 16:04:23

Apr 26

Ajax Basic Operations #Programming Code Examples #NULL

By Author-Check- Article-or-Video in FromSitesTree.com


Get a handle to XMLHttpRequest object

 function getAjaxObject(){

    var ajaxObject = false;

    if (window.XMLHttpRequest){

         ajaxObject = new XMLHttpRequest();

    }else if (window.ActiveXObject) {
      try{
        ajaxObject = new ActiveXObject("Msxml2.XMLHTTP");

      }catch(e){
         try{
          ajaxObject = new ActiveXObject("Microsoft.XMLHTTP");

         }catch(e){
           ajaxObject = false;

         }

      }
    }
    return ajaxObject; 

  }



use of onreadystatechange

if (ajaxObject){
//takeAction - reference to a function
   ajaxObject.onreadystatechange = takeAction; 
}



Sample code:

 var ajaxObject = getAjaxObject();

 if (ajaxObject ){
    ajaxObject.onreadystatechange = takeAction; 

    ajaxObject.open("POST","file.jsp", true);

    ajaxObject.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

    ajaxObject.send("id=500&name=keith&age=18");

 }



function takeAction(ajaxObject){
  if (ajaxObject.readyState == 4) {

     //do something with the response
  }
 }


function takeAction(ajaxObject){

  if (ajaxObject.readyState == 4) {

     if (ajaxObject.status == 200 || ajaxObject.status == 304){ //response was sent succesfully 

          //do something with the response
     }
  }
 }



function takeAction(ajaxObject){
  if (ajaxObject.readyState == 4) {

     if (ajaxObject.status == 200 || 
ajaxObject.status == 304){ 
//response was sent succesfully 

          //do something with the response
          alert(ajaxObject.responseText);

     }
  }
 }






function getAjaxObject(){
    var ajaxObject = false;
    if (window.XMLHttpRequest){

         ajaxObject = new XMLHttpRequest();
    }else if (window.ActiveXObject) {

      try{
        ajaxObject = new ActiveXObject("Msxml2.XMLHTTP");

      }catch(e){
         try{
          ajaxObject = new ActiveXObject("Microsoft.XMLHTTP");

         }catch(e){
           ajaxObject = false;
         }

      }
    }
    return ajaxObject; 
  }

  function entryPoint(){

    var ajaxObject = getAjaxObject();

     if (ajaxObject ){
    ajaxObject.onreadystatechange = function(){

      takeAction(ajaxObject); 
    };
    ajaxObject.open("POST","file.jsp", true);

    ajaxObject.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

    ajaxObject.send("id=500&name=keith&age=18");

 }
 }
 function takeAction(ajaxObject){
  if (ajaxObject.readyState == 4) {

     if (ajaxObject.status == 200 || ajaxObject.status == 304){
 //response was sent succesfully 

          //do something with the response
          alert(ajaxObject.responseText);

          var testDiv = document.getElementById("test");

          testDiv.innerText = ajaxObject.responseText; 

     }
  }
 }



Processing Response Data:

var data = ajaxObject.responseXML;

data.getElementsByTagName("name")

data.getElementsByTagName("name")[0]

data.getElementsByTagName("name")[0].firstChild

data.getElementsByTagName("name")[0].firstChild.nodeValue


JSON Example:

{"person":{ "name":"Keith Tang", "school":"uofm" } } 

var data = eval('('+ ajaxObject.responseText +')');
var name = data.person.name;
var school = data.person.school; 



if (ajaxObject.status == 200 || ajaxObject.status == 304){ 
//response was sent succesfully 
          //do something with the response

          alert(ajaxObject.responseText);
          var testDiv = document.getElementById("test");

          testDiv.innerHTML = ajaxObject.responseText; 

     }

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10177
Categories:Programming Code Examples, NULL
Tags:NULL
Post Data:2017-01-02 16:04:23

Apr 26

UriRetriever.java Accepts a host, port, and file from the command line and retrieves the implied URL from the HTTP server by issuing a GET request. Uses the following classes: #Programming Code Examples #NULL #Network Programming

By Author-Check- Article-or-Video in FromSitesTree.com

UriRetriever.java  Accepts a host, port, and file from the command line and retrieves the implied URL from the HTTP server by issuing a GET request. Uses the following classes:


import java.net.*;
import java.io.*;

/** Retrieve a URL given the host, port, and file as three
 *  separate command-line arguments. A later class
 *  (UrlRetriever) supports a single URL instead.
 *
 *  Taken from Core Web Programming from
 *  Prentice Hall and Sun Microsystems Press,
 *  .
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public class UriRetriever extends NetworkClient {
  private String uri;

  public static void main(String[] args) {
    UriRetriever uriClient
      = new UriRetriever(args[0], Integer.parseInt(args[1]),
                         args[2]);
    uriClient.connect();
  }

  public UriRetriever(String host, int port, String uri) {
    super(host, port);
    this.uri = uri;
  }

  /** Send one GET line, then read the results one line at a
   *  time, printing each to standard output.
   */

  // It is safe to use blocking IO (readLine), since
  // HTTP servers close connection when done, resulting
  // in a null value for readLine.

  protected void handleConnection(Socket uriSocket)
      throws IOException {
    PrintWriter out = SocketUtil.getWriter(uriSocket);
    BufferedReader in = SocketUtil.getReader(uriSocket);
    out.println("GET " + uri + " HTTP/1.0rn");
    String line;
    while ((line = in.readLine()) != null) {
      System.out.println("> " + line);
    }
  }
}


NetworkClient.java  Starting point for a network client to communicate with a remote computer

import java.net.*;
import java.io.*;

/** A starting point for network clients. You'll need to
 *  override handleConnection, but in many cases connect can
 *  remain unchanged. It uses SocketUtil to simplify the
 *  creation of the PrintWriter and BufferedReader.
 *
 *  Taken from Core Web Programming from
 *  Prentice Hall and Sun Microsystems Press,
 *  .
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public class NetworkClient {
  protected String host;
  protected int port;

  /** Register host and port. The connection won't
   *  actually be established until you call
   *  connect.
   */

  public NetworkClient(String host, int port) {
    this.host = host;
    this.port = port;
  }

  /** Establishes the connection, then passes the socket
   *  to handleConnection.
   */

  public void connect() {
    try {
      Socket client = new Socket(host, port);
      handleConnection(client);
    } catch(UnknownHostException uhe) {
      System.out.println("Unknown host: " + host);
      uhe.printStackTrace();
    } catch(IOException ioe) {
      System.out.println("IOException: " + ioe);
      ioe.printStackTrace();
    }
  }

  /** This is the method you will override when
   *  making a network client for your task.
   *  The default version sends a single line
   *  ("Generic Network Client") to the server,
   *  reads one line of response, prints it, then exits.
   */

  protected void handleConnection(Socket client)
    throws IOException {
    PrintWriter out = SocketUtil.getWriter(client);
    BufferedReader in = SocketUtil.getReader(client);
    out.println("Generic Network Client");
    System.out.println
      ("Generic Network Client:n" +
       "Made connection to " + host +
       " and got '" + in.readLine() + "' in response");
    client.close();
  }

  /** The hostname of the server we're contacting. */

  public String getHost() {
    return(host);
  }

  /** The port connection will be made on. */

  public int getPort() {
    return(port);
  }
}

SocketUtil.java  Provides utilities for wrapping a BufferedReader  and PrintWriter around the Socket's input and output streams, respectively. 

import java.net.*;
import java.io.*;

/** A shorthand way to create BufferedReaders and
 *  PrintWriters associated with a Socket.
 *
 *  Taken from Core Web Programming from
 *  Prentice Hall and Sun Microsystems Press,
 *  .
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public class SocketUtil {
  /** Make a BufferedReader to get incoming data. */

  public static BufferedReader getReader(Socket s)
      throws IOException {
    return(new BufferedReader(
       new InputStreamReader(s.getInputStream())));
  }

  /** Make a PrintWriter to send outgoing data.
   *  This PrintWriter will automatically flush stream
   *  when println is called.
   */

  public static PrintWriter getWriter(Socket s)
      throws IOException {
    // Second argument of true means autoflush.
    return(new PrintWriter(s.getOutputStream(), true));
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10230
Categories:Programming Code Examples, NULL, Network Programming
Tags:NULLNetwork Programming
Post Data:2017-01-02 16:04:28

Apr 26

C++ Syntax: in brief #Programming #C++

By Author-Check- Article-or-Video in FromSitesTree.com

This will make sense only if you want to refresh your memory on C++ syntax. 

cout << "Enter two integers:" << endl;           // output to screen
cin >> n >> m;    
// Note: Using endl prints out a newline and flushes the output buffer.

cout << "number of digits in char: " << numeric_limits::digits << 'n';


if (n > m) {                    // if n is bigger than m, swap them
    int temp = n;                 // declare temp and initialize it
    n = m;                        // assign value of m to n
    m = temp;                     // assign value of temp to m
}


long iii = i;          // implicit conversion from int to long
iii = long(i);         // explicit conversion from int to long  


for (double d = 1.1; d <= 9.9; d += 0.2) sum += sin(d);


using namespace std; 

#include  

int main() {

  using namespace std;
}


const int mxdigits = 999500;


int* p = &n;
int m = 200;
*p = m;


double* tryd = new double (x);

unsigned int jj = ii;


cout.width(2);
cout << i;


struct point2d {
  char nm;
  float x;
  float y;
};

point2d pt2 = { 'A', 3.14, -38 };


union val {
  int i;
  double d;
  char c;
};



double* tmv = new double[n];


int n = atoi(argv[1]);  // first integer is assigned to n


int* local = new int;
*local = 555;


namespace Vec {
  const int maxsize = 100000;             // a const number        
  double onenorm(double*, int);           // L 1 norm  
}

double Vec::onenorm(double* v, int size) { 
}



std::cout <<"Approx root near 7.7 by newton method is: " << root << 'n';


---
std::srand(time(0));                  // seed the random number generator
for (int i = 0; i< n; i++) dp[i]  = std::rand()%1000;
std::sort(dp, dp+n);      
---

double d = - 12345.678987654321;
cout.setf(ios_base::scientific, ios_base::floatfield);   // scientific format
cout.setf(ios_base::uppercase);
cout.width(25);
cout.precision(15);
cout.setf(ios_base::left, ios_base::adjustfield);        // adjust to left
cout << d << "n";
--------
double sum(int num, ...);
va_list argPtr;
va_start(argPtr, num);  // initialize argPrt. num is the last known argument

double sum = 0;

for( ; num; num--) {
   sum += va_arg(argPtr, double);   // argument of type double is returned
}

va_end(argPtr);          // deallocate stack pointed to by argPtr
return sum;

--
struct point2d {
  double x;
  double y;
  friend double norm(point2d p) {                   // a friend
    return sqrt(p.x*p.x + p.y*p.y);                 // distance to origin
  }
};
----
class triangle {
  point2d* vertices;
public:
  triangle(point2d, point2d, point2d);         // constructor  
  ~triangle() {      
   }                                           // destructor
  double area() const;                         // a function member 
};
----
class triple {                                  // a triple of numbers
  float* data;
public:
  triple(float a, float b, float c);            // constructor 
  ~triple() { }                                 // destructor, also defined here        
  friend triple add(const triple&, const triple&);      // add is a friend
};
inline triple::triple(const triple& t) {
  data = new float [3];
  for (int i = 0; i < 3; i++) data[i] = t.data[i];
}
-----
operator overloading
class Cmpx {      // class for complex numbers
private:
  double re;      // real part of a complex number
  double im;      // imaginal part of a complex number
public:
  Cmpx(double x = 0, double y = 0) { re =x; im =y; }  // constructor
  Cmpx& operator+=(Cmpx);                          // operator +=, eg z1 +=  z2
  Cmpx& operator-=(Cmpx);                          // operator -=, eg z1 -=  z2
  Cmpx& operator++();                              // prefix,  z1 = ++z
  Cmpx operator++(int);                            // postfix, z1 =  z++


  friend Cmpx operator*(Cmpx, Cmpx);                   // binary *, z = z1 * z2
  friend std::ostream& operator<<(std::ostream&, Cmpx);      // operator <<
  friend std::istream& operator>>(std::istream&, Cmpx&);     // operator >> 
};
----------------
template class Vcr {       
  int lenth;                       // number of entries in vector
  T* vr;                           // entries of the vector
public: 
  Vcr(int, T*);                    // constructor
  Vcr(const Vcr&);                 // copy constructor
  ~Vcr(){ delete[] vr; }           // destructor
 
};

// partial specialization
template class Vcr< complex > {       
  int lenth;                       // number of entries in vector
  complex* vr;                    // entries of the vector
public: 
  Vcr(int, complex*);              // constructor
  Vcr(const Vcr&);                 // copy constructor
  ~Vcr(){ delete[] vr; }           // destructor  
};


// complete specialization
template<>
class Vcr< complex > {       
  int lenth;                       // number of entries in vector
  complex* vr;             // entries of the vector
public: 
  Vcr(int, complex*);      // constructor
  Vcr(const Vcr&);                 // copy constructor
  ~Vcr(){ delete[] vr; }           // destructor
  
};
----------
complex aa = complex(3, 5);
---
 list nodes;                         // a list of integers for nodes

  nodes.push_front(10);              // add 10 at the beginning
  nodes.push_back(5);                // add 5 at the end
  nodes.pop_back();                  // remove last element
  nodes.remove(10);                  // remove element 10

for (list::iterator j = nodes.begin(); j != nodes.end(); j++) 
    cout << *j << "  ";              // *j is the element at position j

nodes.sort(); 
nodes.unique();
nodes.reverse();
nodes.insert(i, 2);                // insert before element that i refers to
  nodes.insert(i, 5, 7);             // insert 5 copies of 7
  nodes.erase(i);
ft.merge(sd);               // ft has the merged list, sd will be empty

list::iterator ii = find(ft.begin(), ft.end(), 5.5); 
  sd.splice(sd.begin(), ft, ii);     

----
VECTOR

std::vector vi(10);
for (int i = 0; i < 10; i++) vi[i] = (i-5)*i;
std::sort(vi.begin(),vi.end());
std::unique(vi.begin(),vi.end());

From: http://sitestree.com/?p=3525
Categories:Programming, C++
Tags:
Post Data:2016-07-07 16:00:12

Apr 26

Advanced Concepts in C++ #Programming #C++

By Author-Check- Article-or-Video in FromSitesTree.com

Resources for some advanced Concepts in C++ are provided below

Standard Adaptors: remove_if
bind1st(), bind2nd():
C++ standard algorithms: http://www.cplusplus.com/reference/algorithm/
http://www.cplusplus.com/reference/: Complete C++ Library Reference
C++ Exception Handling: http://www.eastcoastgames.com/articles/cppexception.html
Copy Constructor
Difference C/C++: Check the links:
http://answers.yahoo.com/question/index?qid=20090613225943AAz8aFw

From: http://sitestree.com/?p=3523
Categories:Programming, C++
Tags:
Post Data:2016-07-07 16:01:22

Apr 26

Lesson 1: Short Notes on C++ #Programming #C++

By Author-Check- Article-or-Video in FromSitesTree.com

This short note is for those who already know C++ and want to refresh their memory. Starters can still take a look to get an overall idea.

Three pillars of object-oriented development: encapsulation, inheritance, and polymorphism.
C++ supports encapsulation through (user-defined) classes. Class properties and internal workings can be hidden from outside world.
C++ supports polymorphism through overloading, overriding
C++ supports inheritance by allowing classes to share (extend) the properties and workings of other classes
Managed C++ is an extension of the C++ language. Managed C++ allows the use of Microsoft’s new platform (.Net) and libraries
How to include header files: #include <iostream> or #include <iostream.h>
Print in the console: std::cout <<“Hello World!n”; or cout <<“Hello World!n”; std::cout << “Number and String together:t” << 70000;
Read from the console: std::cin >> response; where response is a variable
If you do not want to use ‘std::’ in the previous examples, you can use the statement ‘using namespace std;’ before
How to comment: use // to comment single line or use /*c++ code*/ to comment a block
[ Code commenting is a good practice only when you describe why is the code block than what the block does.]
C++ is case sensitive
Keywords, Reserved words: Some words are reserved in C++. You can not use them as variable names.
Keywords:
asm else new this auto enum operator throw bool explicit private true break export protected try case extern public typedef catch false register typeid char float reinterpret_cast typename class for return union const friend short unsigned const_cast goto signed using continue if sizeof virtual default inline static void delete int static_cast volatile do long struct wchar_t double mutable switch while dynamic_cast namespace template
Reserved words: And bitor not_eq xor and_eq compl or xor_eq bitand not or_eq
Variable declaration: unsigned int age;
How to create aliases: typedef unsigned short int USHORT;
C++ Escape characters:
a Bell (alert)
b Backspace
f Form feed
n New line
r Carriage return
t Tab
v Vertical tab
‘ Single quote
” Double quote
? Question mark
\ Backslash
00 Octal notation
xhhh Hexadecimal notation
Define constants:
#define numberOfContinents 7
Enumerated constants:
enum WeekDays { Monday, Tuesday, Wednesday, Thursday, Friday};
WeekDays day;

From: http://sitestree.com/?p=3521
Categories:Programming, C++
Tags:
Post Data:2016-07-07 16:02:16

Apr 25

Lecture 27 | Programming Abstractions (Stanford) #Programming #C++

By Author-Check- Article-or-Video in FromSitesTree.com

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Categories:Programming, C++
Tags:C#, Programming, Abstraction, Stanford
Post Data:2015-10-29 18:42:41

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Understanding the Hierarchical DNS System: Domains, Subdomains, and FQDNs

DNS Hierarchy with a Domain Name

How DNS Names Work: Example with chat.811tech.ca

What Does “Namespace” Mean in DNS?

How a DNS Request Travels Across Networks

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