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12 total

On This Page:

  1. 1 Force Website To Not Use WWW Prefix
  2. 2 Use Conditional Comments to Subjugate IE
  3. 3 Use of the geo microformat
  4. 4 Use of PHP isset for a submit form
  5. 5 Use a variable in a JavaScript regular expression
  1. 6 Use HTML and JavaScript to send Text to Flash
  2. 7 AStarMap pathfinding grid (use with AStar class)
  3. 8 Use cookie to save session data
  4. 9 How to use NSOperationQueue
  5. 10 Use multiple databases in rails.

Use of PHP isset for a submit form

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// Use of PHP isset for a submit form
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	<body>
		<?php
		 	if(!isset($_POST['submit'])){
		?>
		
		<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
		Enter your age: <input name="age" size="2">
		<input type="submit" name="submit" value="Go">
		
		<?php 
			} else {
				//Grab the text we input
				$input = $_POST['age'];
				
				if($input < 27){
					echo "You are young";
				} elseif($input == 27){
					echo "The perfect age";
				} elseif($input > 27){
					echo "You are old!";
				}
			}
		?>
	</body>
</html>

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Use HTML and JavaScript to send Text to Flash

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// Use HTML and JavaScript to send Text to Flash
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<!--
/*******************************
This Code Goes inside your FLA
*******************************/
import flash.external.ExternalInterface;
import flash.events.Event;

ExternalInterface.addCallback("sendTextToFlash", getTextFromJavaScript);
function getTextFromJavaScript(str:String):void {
	textTxt.appendText(str);
}

var textTxt:TextField = new TextField();
	textTxt.x = 0;
	textTxt.y = 0;
	addChild(textTxt);
-->

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AStarMap pathfinding grid (use with AStar class)

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// AStarMap pathfinding grid (use with AStar class)
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package com.game.astar
{
	public class AStarMap {
		
		//these are the states available for each cell.
		public const CELL_FREE:uint = 0;
		public const CELL_FILLED:uint = 1;
		public const CELL_ORIGIN:uint = 2;
		public const CELL_DESTINATION:uint = 3;
		public const MAX_ITERATIONS:uint = 2000;
		
		public var gridWidth:uint;
		public var gridHeight:uint;
		
		public var isSolved:Boolean;
		
		private var originCell:Object;
		private var destinationCell:Object;
		private var currentCell:Object;
		
		private var openList:Array;
		private var closedList:Array;
		
		private var mapArray:Array;
		
		//------------------------------------------------------------------------------------
		//grid sizes refer to the size in units of cell size, not pixel size.
		public function AStarMap(_gridWidth:int, _gridHeight:int):void 
		{
			gridWidth = _gridWidth;
			gridHeight = _gridHeight;
			
			//define map
			mapArray = new Array();
			var xx:int = 0;
			var yy:int = 0;
			for(xx = 0; xx < gridWidth; xx++) 
			{
				mapArray[xx] = new Array();
				for(yy = 0; yy < gridHeight; yy++) 
				{					
					mapArray[xx][yy] = new Object();
					mapArray[xx][yy].cellType = CELL_FREE;					
					mapArray[xx][yy].parentCell = null;
					mapArray[xx][yy].g = 0;
					mapArray[xx][yy].f = 0;
					mapArray[xx][yy].x = xx;
					mapArray[xx][yy].y = yy;
				}
				
			}
			
			openList = new Array();
			closedList = new Array();
		}
		//----------------------------------------------------------------------------------
		public function solve():Array
		{
			//count = 0;
			reset();
			//trace(destinationCell.x, destinationCell.y);
			isSolved = false;
			var iter:int = 0;
			
			isSolved = stepPathfinder();

			while(!isSolved) 
			{
				isSolved = stepPathfinder();
				if(iter++ > MAX_ITERATIONS) return null;
			}

			//set pointer to last cell on list
			//if pointer is pointing to originCell, then finish
			//if pointer is not pointing at origin cell, then process, and set pointer to parent of current cell	
			var solutionPath:Array = new Array();
			var count:int = 0;
			var cellPointer:Object = closedList[closedList.length - 1];
			while(cellPointer != originCell) 
			{
				if(count++ > 800) return null; //prevent a hang in case something goes awry
				solutionPath.push(cellPointer);				
				cellPointer = cellPointer.parentCell;					
			}
			
			return solutionPath;
				
		}

		//----------------------------------------------------------------------------------
		private function stepPathfinder():Boolean {
			//trace(cnt++);
			if(currentCell == destinationCell) 
			{
				closedList.push(destinationCell);
				return true;
			}
			
			//place current cell into openList
			openList.push(currentCell);	

			//----------------------------------------------------------------------------------------------------
			//place all legal adjacent squares into a temporary array
			//----------------------------------------------------------------------------------------------------
			
			//add legal adjacent cells from above to the open list
			var adjacentCell:Array = new Array();
			var arryPtr:Object;
			var isDiagonal:Boolean;
			
			for(var xx:int = -1; xx <= 1; xx++) 
			{				
				for(var yy:int = -1; yy <= 1; yy++) 
				{	
					/*
						Look at all the adjacent cells
					*/
					if(!(xx == 0 && yy == 0)) //this is the current cell, so skip it.
					{ 
						/*
							is adjacent Cell within the grid bounds?
						*/
						if(currentCell.x+xx >= 0 && currentCell.y+yy >= 0 && currentCell.x+xx < gridWidth && currentCell.y+yy < gridHeight) 
						{
							/*
								is adjacent cell NOT diagonal to the currentCell?
							*/
							isDiagonal = ((xx==-1 || xx==1) && (yy==-1 || yy==1));
							/*
								CurrentCell is in the mapArray?
							*/
							if(mapArray[currentCell.x+xx][currentCell.y+yy]) 
							{
								arryPtr = mapArray[currentCell.x+xx][currentCell.y+yy];
								
								if(arryPtr.cellType != CELL_FILLED && closedList.indexOf(arryPtr) == -1 && !isDiagonal) 
								{
									//trace(mapArray[currentCell.x + xx][currentCell.y + yy]);
									adjacentCell.push(arryPtr);
								}								
							}
						}
					}					
				}						
			}
						
						
			var g:int;
			var h:int;

			for(var ii:int = 0; ii < adjacentCell.length; ii++) {
								
				g = currentCell.g + 1;
				
				h = Math.abs(adjacentCell[ii].x - destinationCell.x) + Math.abs(adjacentCell[ii].y - destinationCell.y);
					
				if(openList.indexOf(adjacentCell[ii]) == -1) { //is cell already on the open list? - no									

					adjacentCell[ii].f = g + h;
					adjacentCell[ii].parentCell = currentCell;
					adjacentCell[ii].g = g;					
					openList.push(adjacentCell[ii]);

				} else { //is cell already on the open list? - yes
					
					if(adjacentCell[ii].g < currentCell.parentCell.g) 
					{
						currentCell.parentCell = adjacentCell[ii];
						currentCell.g = adjacentCell[ii].g + 1;
						currentCell.f = adjacentCell[ii].g + h;
					}
				}
			}
				
			//Remove current cell from openList and add to closedList.
			var indexOfCurrent:int = openList.indexOf(currentCell);
			closedList.push(currentCell);
			openList.splice(indexOfCurrent, 1);
			
			//Take the lowest scoring openList cell and make it the current cell.
			openList.sortOn("f", Array.NUMERIC | Array.DESCENDING);	
			
			if(openList.length == 0) return true;
			
			currentCell = openList.pop();			
			
			return false;
		}
		//------------------------------------------------------------------------------------
		public function getCell(xx:int, yy:int):Object 
		{
			return mapArray[xx][yy];
		}	
		//------------------------------------------------------------------------------------
		//Sets individual cell state
		public function setCell(xx:int, yy:int, cellType:int):void 
		{
			mapArray[xx][yy].cellType = cellType;
		}
		//------------------------------------------------------------------------------------
		//Toggle cell between "filled" and "free" states
		public function toggleCell(cellX:int, cellY:int):void 
		{
			if(mapArray[cellX][cellY].cellType == CELL_FILLED) mapArray[cellX][cellY].cellType = CELL_FREE;
			else if(mapArray[cellX][cellY].cellType == CELL_FREE) mapArray[cellX][cellY].cellType = CELL_FILLED;
		}
		//------------------------------------------------------------------------------------
		//Sets origin and destination
		public function setEndPoints(originX:int, originY:int, destX:int, destY:int):void 
		{
			originCell = mapArray[originX][originY];
			destinationCell = mapArray[destX][destY];
			
			originCell.cellType = CELL_ORIGIN;
			destinationCell.cellType = CELL_DESTINATION;
			
			currentCell = originCell;
			closedList.push(originCell);
		}
		//------------------------------------------------------------------------------------
		//Resets algorithm without clearing cells
		public function reset():void 
		{
			for(var xx:int = 0; xx < gridWidth; xx++) 
			{
				for(var yy:int = 0; yy < gridHeight; yy++) 
				{									
					mapArray[xx][yy].parentCell = null;
					mapArray[xx][yy].g = 0;
					mapArray[xx][yy].f = 0;
				}				
			}
			
			openList = new Array();
			closedList = new Array();
			
			currentCell = originCell;
			closedList.push(originCell);
		}
		//------------------------------------------------------------------------------------
		//Sets all filled cells to free cells (does not affect origin or destination cells)
		public function clearMap():void 
		{
			for(var xx:int = 0; xx < gridWidth; xx++) {
				//mapArray[xx] = new Array();
				for(var yy:int = 0; yy < gridHeight; yy++) {					
					//mapArray[xx][yy] = new Object();
					if(mapArray[xx][yy].cellType == CELL_FILLED) mapArray[xx][yy].cellType  = CELL_FREE;					
					mapArray[xx][yy].parentCell = null;
					mapArray[xx][yy].g = 0;
					mapArray[xx][yy].f = 0;
					mapArray[xx][yy].x = xx;
					mapArray[xx][yy].y = yy;
				}
			}
		}
	} //end class
	
}

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Use cookie to save session data

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// Use cookie to save session data
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import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ShoppingCartViewerCookie extends HttpServlet {

  public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException,
      IOException {
    res.setContentType("text/html");
    PrintWriter out = res.getWriter();

    String sessionid = null;
    Cookie[] cookies = req.getCookies();
    if (cookies != null) {
      for (int i = 0; i < cookies.length; i++) {
        if (cookies[i].getName().equals("sessionid")) {
          sessionid = cookies[i].getValue();
          break;
        }
      }
    }

    // If the session ID wasn't sent, generate one.
    // Then be sure to send it to the client with the response.
    if (sessionid == null) {
      sessionid = generateSessionId();
      Cookie c = new Cookie("sessionid", sessionid);
      res.addCookie(c);
    }

    out.println("<HEAD><TITLE>Current Shopping Cart Items</TITLE></HEAD>");
    out.println("<BODY>");

    // Cart items are associated with the session ID
    String[] items = getItemsFromCart(sessionid);

    // Print the current cart items.
    out.println("You currently have the following items in your cart:<BR>");
    if (items == null) {
      out.println("<B>None</B>");
    } else {
      out.println("<UL>");
      for (int i = 0; i < items.length; i++) {
        out.println("<LI>" + items[i]);
      }
      out.println("</UL>");
    }

    // Ask if they want to add more items or check out.
    out.println("<FORM ACTION=\"/servlet/ShoppingCart\" METHOD=POST>");
    out.println("Would you like to<BR>");
    out.println("<INPUT TYPE=SUBMIT VALUE=\" Add More Items \">");
    out.println("<INPUT TYPE=SUBMIT VALUE=\" Check Out \">");
    out.println("</FORM>");

    // Offer a help page.
    out.println("For help, click <A HREF=\"/servlet/Help"
        + "?topic=ShoppingCartViewerCookie\">here</A>");

    out.println("</BODY></HTML>");
  }

  private static String generateSessionId() throws UnsupportedEncodingException {
    String uid = new java.rmi.server.UID().toString(); // guaranteed unique
    return URLEncoder.encode(uid,"UTF-8"); // encode any special chars
  }

  private static String[] getItemsFromCart(String sessionid) {
    return new String[]{"a","b"};  
  }
}

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How to use NSOperationQueue

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// How to use NSOperationQueue
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@interface PersonTableViewController : UITableViewController <AddPerson> {
	NSOperationQueue *queue;
}
@end

@implementation PersonTableViewController

- (void)addPerson:(NSString *)username {
	NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(addPersonInBackground:) object:username];
	[queue addOperation:operation]; 
	[operation release];
}
@end

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Use multiple databases in rails.

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// Use multiple databases in rails.
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class RegularModel < ActiveRecord::Base
end


class MyModel < ActiveRecord::Base
  establish_connection "another_db"
end

# these then use the following, located in database.yml
development:
  adapter: mysql
  database: firstdb
  pool: 5
  timeout: 5000

another_db:
  adapter: mysql
  database: second_db_table
  pool: 5
  timeoute: 5000

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12 total

On This Page:

  1. 1 Force Website To Not Use WWW Prefix
  2. 2 Use Conditional Comments to Subjugate IE
  3. 3 Use of the geo microformat
  4. 4 Use of PHP isset for a submit form
  5. 5 Use a variable in a JavaScript regular expression
  1. 6 Use HTML and JavaScript to send Text to Flash
  2. 7 AStarMap pathfinding grid (use with AStar class)
  3. 8 Use cookie to save session data
  4. 9 How to use NSOperationQueue
  5. 10 Use multiple databases in rails.