// wForms - a javascript extension to web forms.
// see http://www.formassembly.com/wForms
// This software is licensed under the CC-GNU LGPL <http://creativecommons.org/licenses/LGPL/2.1/>

function wHELPERS() {};

// addEvent adapated from http://ejohn.org/projects/flexible-javascript-events/
// and  Andy Smith's (http://weblogs.asp.net/asmith/archive/2003/10/06/30744.aspx)
wHELPERS.prototype.addEvent = function(obj, type, fn) {
	if(!obj) { return; }
	
	if (obj.attachEvent) {
		obj['e'+type+fn] = fn;
		obj[type+fn] = function(){obj['e'+type+fn]( window.event );}
		obj.attachEvent( 'on'+type, obj[type+fn] );
	} else if(obj.addEventListener) {			
		obj.addEventListener( type,fn, false );
	} else {
		var originalHandler = obj["on" + type]; 
		if (originalHandler) { 
		  obj["on" + type] = function(e){originalHandler(e);fn(e);}; 
		} else { 
		  obj["on" + type] = fn; 
		} 
	}
}

wHELPERS.prototype.removeEvent = function(obj, type, fn) {
	if (obj.detachEvent) {
		if(obj[type+fn]) {
			obj.detachEvent( 'on'+type, obj[type+fn] );
			obj[type+fn] = null;
		}
	} else if(obj.removeEventListener)
		obj.removeEventListener( type, fn, false );
	else {
		obj["on" + type] = null;
	}
}

// Returns the event's source element 
wHELPERS.prototype.getSourceElement = function(e) {	
	if(!e) e = window.event;	
	if(e.target)
		var srcE = e.target;
	else
		var srcE = e.srcElement;
	if(!srcE) return null;
	if(srcE.nodeType == 3) srcE = srcE.parentNode; // safari weirdness		
	if(srcE.tagName.toUpperCase()=='LABEL' && e.type=='click') { 
		// when clicking a label, firefox fires the input onclick event
		// but the label remains the source of the event. In Opera and IE 
		// the source of the event is the input element. Which is the 
		// expected behavior, I suppose.		
		if(srcE.getAttribute('for')) {
			srcE = document.getElementById(srcE.getAttribute('for'));
		}
	}
	return srcE;
}

// Cancel the default execution of an event.
wHELPERS.prototype.preventEvent = function(e) {
	if (!e) e = window.event;
	if (e.preventDefault) e.preventDefault();
	else e.returnValue = false;
	return false;
}

// Cancel the propagation of the event
wHELPERS.prototype.stopPropagation = function(e) {
	if (!e) var e = window.event;
	e.cancelBubble = true;
	if (e.stopPropagation) e.stopPropagation();
}

// Generates a random ID
wHELPERS.prototype.randomId = function () {
	var seed = (new Date()).getTime();
	seed = seed.toString().substr(6);
	for (var i=0; i<6;i++)
		seed += String.fromCharCode(48 + Math.floor((Math.random()*10)));
	return "id-" + seed;
}

// Activating an Alternate Stylesheet (thx to: http://www.howtocreate.co.uk/tutorials/index.php?tut=0&part=27)
// Use this to activate a CSS Stylesheet that shouldn't be used if javascript is turned off.
// The stylesheet rel attribute should be 'alternate stylesheet'. The title attribute MUST be set.
wHELPERS.prototype.activateStylesheet = function(sheetref) {
	if(document.getElementsByTagName) {
		var ss=document.getElementsByTagName('link');
	} else if (document.styleSheets) {
		var ss = document.styleSheets;
	}
	for(var i=0;ss[i];i++ ) {
		if(ss[i].href.indexOf(sheetref) != -1) {
			ss[i].disabled = true;
			ss[i].disabled = false;			
		}
	}
}

// hasClass
wHELPERS.prototype.hasClass = function(element,className) {
	if(element && element.className) {
		if((' ' + element.className + ' ').indexOf(' ' + className +' ') != -1) {
			return true;
		}
	}
	return false;
}
wHELPERS.prototype.hasClassPrefix = function(element,className) {
	if(element && element.className) {
		if((' ' + element.className).indexOf(' ' + className) != -1) {
			return true;
		}
	}
	return false;
}
	wHELPERS.prototype.hasIdPrefix = function(element,idPrefix) {
		if(element && element.id) {
			if(element.id.indexOf(idPrefix) != -1) {
				return true;
			}
		}
		return false;
	}


// getTop / getLeft  
// Returns pixel coordinates from the top-left window corner.
wHELPERS.prototype.getTop = function(obj) {
	var cur = 0;
	if(obj.offsetParent) {		
		while(obj.offsetParent) {
			if((new wHELPERS()).getComputedStyle(obj,'position') == 'relative' ) {
				// relatively postioned element
				return cur;
			}
			cur+=obj.offsetTop;
			obj = obj.offsetParent;
		}
	}
	return cur;
}
wHELPERS.prototype.getLeft = function(obj) {
	var cur = 0;
	if(obj.offsetParent) {		
		while(obj.offsetParent) {
			if((new wHELPERS()).getComputedStyle(obj,'position') == 'relative' ) {
				// relatively postioned element
				return cur;
			}
			cur+=obj.offsetLeft;
			obj = obj.offsetParent;
		}
	}
	return cur;
}

wHELPERS.prototype.getComputedStyle = function(element, styleName) {
	if(window.getComputedStyle) {
		return window.getComputedStyle(element,"").getPropertyValue(styleName);
	} else if(element.currentStyle) {	
		return element.currentStyle[styleName];
	}
	return false;
}
// backward compatibility
	var wHelpers = wHELPERS;   


   /* 
	* MISC FUNCTIONS 
   /* ------------------------------------------------------------------------------------------ */

// Push implementation for IE5/mac
if (!Array.prototype.push) { 
	Array.prototype.push = function() { 
		for (var i = 0; i < arguments.length; ++i) { 
			this[this.length] = arguments[i]; 
		} 
		return this.length; 
	}; 
}


  if(wHELPERS) {
	  var wFORMS = { 
	  
	  debugLevel     : 0, /* 0: Inactive, 1+: Debug Level */
	  
	  helpers        : new wHELPERS(),     
	  behaviors      : {},
	  onLoadComplete : new Array(),  /* stack of functions to call once all behaviors have been applied */
	  processedForm  : null,
	  
	  onLoadHandler  : function() {
		  for(var behaviorName in  wFORMS.behaviors) {
			   wFORMS.debug('wForms/loaded behavior: ' + behaviorName);
		  }
		 
		  for (var i=0;i<document.forms.length;i++) {
			  wFORMS.debug('wForms/initialize: '+ (document.forms[i].name || document.forms[i].id) );
			  	wFORMS.processedForm = document.forms[i];
			  wFORMS.addBehaviors(document.forms[i]);
		  }
	  },
	  
	  addBehaviors : function (node) {
		 if(!node) return;
		 
		 var deep = arguments[1]?arguments[1]:true;
		 if(!node.nodeType) {
			 // argument is not a node. probably an id string. 
			 // (typeof not used for IE5/mac compatibility)
			 node = document.getElementById(node);
		 }
			if(!node || node.nodeType!=1) return;
			
			deep=(arguments.length>1)?arguments[1]:true;	
				   
			wFORMS._addBehaviors(node, deep);					
		  },
		  
	  _addBehaviors : function (node, deep) {
		  if(node.getAttribute('rel')=='no-behavior') {
		  	return false;
		  }
		
		 // Process element nodes only
		 if(node.nodeType == 1) { 
			  for(var behaviorName in wFORMS.behaviors) {
				  wFORMS.behaviors[behaviorName].evaluate(node);
			  }
			 
			  if(deep) {
				  for (var i=0, l=node.childNodes.length, cn=node.childNodes; i<l; i++) {
				  	 if(cn[i].nodeType==1)
					 	wFORMS._addBehaviors(cn[i], deep);
				  }
			  }
			  
			  if(node.tagName.toUpperCase() == 'FORM') {
				  // wFORMS.debug('wForms/processed: ' + node.id);
				  // run the init stack
				  for (var i=0;i<wFORMS.onLoadComplete.length;i++) {
					  wFORMS.onLoadComplete[i]();
				  }
				  // empty the stack					  
				  if(wFORMS.onLoadComplete.length > 0) {
					  wFORMS.onLoadComplete = new Array();
				  }
			  }
		  }
	  },
	  
	  hasBehavior: function(behaviorName) {
		  if(wFORMS.behaviors[behaviorName]) return true;
		  return false;
	  },
	  
	  /* 
	   * DEBUG FUNCTIONS 
	   * ------------------------------------------------------------------------------------------ */
	  debug : function(txt) { 
		msgLevel = arguments[1] || 10; 	// 1 = least importance, X = most important
		
		if(wFORMS.debugLevel > 0 && msgLevel >= wFORMS.debugLevel) {
			if(!wFORMS.debugOutput)
				wFORMS.initDebug();
			if(wFORMS.debugOutput)
				wFORMS.debugOutput.innerHTML += "<br />" + txt;
		}
	  },
	  
	  initDebug : function() {
		var output = document.getElementById('debugOutput');
		if(!output) {
			output = document.createElement('div');
			output.id = 'debugOutput';
			output.style.position   = 'absolute';
			output.style.right      = '10px';
			output.style.top        = '10px';
			output.style.zIndex     = '300';
			output.style.fontSize   = 'x-small';
			output.style.fontFamily = 'courier';
			output.style.backgroundColor = '#DDD';
			output.style.padding    = '5px';
			if(document.body) // if page fully loaded
				wFORMS.debugOutput = document.body.appendChild(output);
		}
		if(wFORMS.debugOutput)
			wFORMS.debugOutput.ondblclick = function() { this.innerHTML = '' };
	}
  };
  
  wFORMS.NAME     = "wForms";
  wFORMS.VERSION  = "2.0";
  wFORMS.__repr__ = function () {
	return "[" + this.NAME + " " + this.VERSION + "]";
  };
  wFORMS.toString = function () {
	return this.__repr__();
  };
 
 
  // For backward compatibility
  wFORMS.utilities = wFORMS.helpers;
  var wf           = wFORMS; 
  wf.utilities.getSrcElement				= wFORMS.helpers.getSourceElement;
  wf.utilities.XBrowserPreventEventDefault	= wFORMS.helpers.preventEvent;
  
  // Initializations:
  
  // Attach JS only stylesheet.
  wFORMS.helpers.activateStylesheet('wforms-jsonly.css');
  // Parse document and apply wForms behavior
  wFORMS.helpers.addEvent(window,'load',wFORMS.onLoadHandler);
  }