// home.js - for dynamic lead and form validation


/* begin: Newsletter Signup Form Validation */
function isValidEmail(str) {
	var filter  = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})$/;
	return (filter.test(str));
}

function validateSignup(form) {
	var error = "";
	var subCount = 0;
	for (var i=0; i < form.sub.length; i++) {
		if (form.sub[i].checked) {
			subCount += 1;
		}
	}
	if (subCount == 0) {
		error += "Please select at least one newsletter.\n";
	}
	if (!isValidEmail(form.email.value)){
		error += "Please enter a valid email address.\n";
	}
	if (error != "") {
		alert(error + "\nThank You,\nHealth.com");
		return false;
	}
	return true;
}
/* end: Newsletter Signup Form Validation */


/***** TII Global Browser Sniffing Variables *****/
var tii_isopera = typeof window.opera != 'undefined';
var tii_isie = typeof document.all != 'undefined' && !tii_isopera && navigator.vendor != 'KDE';
var tii_issafari = navigator.vendor == 'Apple Computer, Inc.';
	

/***** ^^^ TII Global Functions Placed in >TII>Shared>JavaScript>TII LIB - JavaScript Event Listeners ^^^ *****/
/* Adds a function for the window load event */
function tii_callFunctionOnWindowLoad (functionToCall)
{
  if (typeof window.addEventListener != 'undefined')
  {
    window.addEventListener ('load', functionToCall, false);
  }
  else if (typeof document.addEventListener != 'undefined')
  {
    document.addEventListener ('load', functionToCall, false);
  }
  else if (typeof window.attachEvent != 'undefined')
  {
    window.attachEvent ('onload', functionToCall);
  }
  else
  {
    var oldFunctionToCall = window.onload;
    if (typeof window.onload != 'function')
    {
      window.onload = functionToCall;
    }
    else
    {
      window.onload = function ()
      {
        oldFunctionToCall ();
        functionToCall ();
      };
    }
  }
}

/* Calls functionToCall as soon as the targetElement is loaded, even if the document hasn't completely loaded yet. 
   Place the parameter list for functionToCall in order after tii_callFunctionOnElementLoad (targetId, functionToCall),
   e.g., tii_callFunctionOnElementLoad (targetId, functionToCall, parameter1, parameter 2, parameter 3, ...) */  
function tii_callFunctionOnElementLoad (targetId, functionToCall)
{
	var myArguments = arguments;
	tii_callFunctionOnWindowLoad (function ()
		{
			window.loaded = true;
		});
	var targetElement = document.getElementById (targetId);
	if (targetElement == null && !window.loaded)
	{
		var pollingInterval = setInterval (function ()
			{
				if (window.loaded)
				{
					clearInterval (pollingInterval);
				}
				targetElement = document.getElementById (targetId);
				if (targetElement != null)
				{
					clearInterval (pollingInterval);
					var argumentsTemp = new Array ();
					var argumentsTempLength = myArguments.length - 2;
					for (var i = 0; i < argumentsTempLength; i++)
					{
						argumentsTemp [i] = myArguments [i + 2];
					}		
					functionToCall.apply (this, argumentsTemp);
				}
			}, 10);
	}
}

/* Attaches an event handling function to the targetElement. 
   Examples of eventType values are 'mouseover' and 'keyup', as opposed to 'onmouseover' and 'onkeyup'. 
   bubbleEventUpDOMTree is a boolean variable specifying whether the event should activate the event listeners
   of all the ancestors of the element (up to the window object) */
function tii_addEventHandler (targetElement, eventType, functionToCall, bubbleEventUpDOMTree)
{
  if (!targetElement)
  {
	  window.status = 'Warning: Tried to attach event to null object';
	  return false;
  }
  if (typeof targetElement.addEventListener != 'undefined')
  {
    targetElement.addEventListener (eventType, functionToCall, bubbleEventUpDOMTree);
  }
  else if (typeof targetElement.attachEvent != 'undefined')
  {
    targetElement.attachEvent ('on' + eventType, functionToCall);
  }
  else
  {
    eventType = 'on' + eventType;
    if (typeof targetElement [eventType] == 'function')
    {
      var oldListener = targetElement [eventType];
      targetElement [eventType] = function ()
      {
        oldListener ();
        return functionToCall ();
      }
    }
    else
    {
      targetElement [eventType] = functionToCall;
    }
  }

  return true;
}

/* Begin Main story module */
var currPic=0;
var timer1, timer2;
var paused = true;
var opacity = 100;
var msDivs = new Array(5);
var msButtons = new Array(5); 
var msWrap;
var button;
var position;
var currPosition;

function initPageComponents() {
 /*  Used to load all components on the page */
 msDivs[0] = document.getElementById('mainStory1');
 msDivs[1] = document.getElementById('mainStory2');
 msDivs[2] = document.getElementById('mainStory3');
 msDivs[3] = document.getElementById('mainStory4');
 msDivs[4] = document.getElementById('mainStory5');
 msButtons[0] = document.getElementById('a1'); 
 msButtons[1] = document.getElementById('a2');
 msButtons[2] = document.getElementById('a3');
 msButtons[3] = document.getElementById('a4');
 msButtons[4] = document.getElementById('a5'); 
 msWrap = document.getElementById('mainStoryWrap');
 // if we do not have all of the working parts, do not init the slideshow
 if (msWrap != null && msDivs[0] != null && msButtons[0] != null) {
 	initPausePlayEvents();
 	var breakingNews = document.getElementById('breakingNewsImg');
 	if (breakingNews == null) {
 		paused = false;
 		timer1 = setTimeout('timedStory()', 7000);
 	}
 	doImageSwap();
 }
}

function initPausePlayEvents() {
	/* add Event Handlers for the Photo Module */
	if (!document.getElementById || !document.getElementsByTagName) {
		return true;
	}
	/* checks for Javascript operability  */ 
	
	/*  get all the links in the photo module  */
	var topStories = document.getElementById('topStories');
	if (topStories != null) {
		var links = topStories.getElementsByTagName('a');
		
		for (i = 0; i < links.length; i++) {
			if (links.item(i).id.substring(0, 1) == 'a') {
				//filter the links for those that have a class name beginnig with 'a'
				//add the doNumber event handler for the number links
				links.item(i).href = 'javascript:{}';
				tii_addEventHandler(links[i], 'click', function(event){
					doNumber(event);
				}, false);
			}
		}
		
	var playLink = document.getElementById('playLink');
		
	//add the doButton event handler for the play pause button 
	tii_addEventHandler(playLink, 'click', function(event){
		doButton(event);
	}, false);
	}
}

/* helper function to deal specifically with images and the cross-browser differences in opacity handling */
function fader(opac) {
	if (msWrap != null) {
		if (msWrap.style.MozOpacity != null) {
			/* Mozilla's pre-CSS3 proprietary rule */
			msWrap.style.MozOpacity = (opac / 100) - .001;
		}
		else 
			if (msWrap.style.opac != null) {
				/* CSS3 compatible */
				msWrap.style.opacity = (opac / 100) - .001;
			}
			else 
				if (msWrap.style.filter != null) {
					/* IE's proprietary filter */
					if (opac == 100) {
						msWrap.style.filter = "none;";
					}
					else {
						msWrap.style.filter = "alpha(opacity=" + opac + ");";
					}
				}
	}
}

function change(num, step) {
 /*fadeOut*/
 if (step == 1) {
  opacity -= 10;
  if (opacity > 0) {
   fader(opacity);
   timer2=setTimeout('change(' + num + ', 1)',50);
  }
  else { 
   change(num, 2);
  }
 }

 /*change picture*/
 else if (step == 2) {
  currPic = num;
  msDivs[0].style.display = (num == 0 ? "block" : "none"); 
  msDivs[1].style.display = (num == 1 ? "block" : "none"); 
  msDivs[2].style.display = (num == 2 ? "block" : "none");
  msDivs[3].style.display = (num == 3 ? "block" : "none");
  msDivs[4].style.display = (num == 4 ? "block" : "none"); 
  msButtons[0].className = (num == 0 ? "on" : "off");
  msButtons[1].className = (num == 1 ? "on" : "off");
  msButtons[2].className = (num == 2 ? "on" : "off"); 
  msButtons[3].className = (num == 3 ? "on" : "off");
  msButtons[4].className = (num == 4 ? "on" : "off");
  change(num, 3);
 }
 /*fadeIn*/
 else if (step == 3) { 
  opacity += 10;
  if (opacity <= 100) {
   fader(opacity);
   timer2=setTimeout('change(' + num + ', 3)',50);
  }
 }
}

/* change picture, wait 5 seconds, repeat */
function timedStory() {
 if (currPic<4){
 currPic++;
 change(currPic, 1);
 timer1=setTimeout('timedStory()',7000);
 }else{
	 currPic=0;
	clearTimeout(timer1);
	change(currPic,1);
	paused = true;
	doImageSwap();
 }
}

/* executed when the play pause button is selected */
function doButton(event) {
 paused = !paused;
 doImageSwap();
 if (paused) {
  /* stop the image loop */
  clearTimeout(timer1);
 }
 else { 
  /* restart the image loop */
  timedStory();
 }
}  

/*executed when a number link is selected */
function doNumber (event) {
 var eventSource = typeof event.target != 'undefined' ? event.target : window.event.srcElement;
 /*  get the number portion of the class name of the event source */ 
 currPic = eventSource.id.substring(1,2) - 1;
 paused = true;
 doImageSwap();
 clearTimeout(timer1);
 clearTimeout(timer2);
 change(currPic, 1);

} 

/* swap the play pause button image */
function doImageSwap() {
	var button = document.getElementById('playLink'); 
	if (button != null) {
		if (!tii_isie) {
			var imageFile = paused ? "http://img2.timeinc.net/health/static/i/home_pg_ctrl_btn_play.png" : "http://img2.timeinc.net/health/static/i/home_pg_ctrl_btn_pause.png";
			button.style.background = "url(" + imageFile + ") 0px 0px no-repeat";
		}
		else {
			/*  Use an image sprite to deplete the image flickering in IE */
			button.style.backgroundImage = "url(http://img2.timeinc.net/health/static/i/home_pg_ctrl_btn_playpause.png)";
			position = paused ? "24px" : "0px"; /* change the image source */
			try {
				document.execCommand('BackgroundImageCache', false, true);
			} 
			catch (e) {
			}
			
			/* if paused and play is not displayed */
			if (paused == true && currPosition != "24px") {
				button.style.backgroundPositionY = position;
			}
			/* if playing and paused is not displayed */
			if (paused != true && currPosition != "0px") {
				button.style.backgroundPositionY = position;
			}
			currPosition = position;
		}
	}
}   
/* End Main story module */
// home.js - for dynamic lead and form validation

/********************* Begin slideshow module *********************/
var currPic = 0;
var paused = false;
var ssTxt = new Array(5);
var ssPh = new Array(5);
var ppBtn, ppBtnPrev, ppBtnNext;
var timer1;
var delay = 6000; //in ms


tii_callFunctionOnWindowLoad (function () {
	initPageComponents();
});
/********************* End slideshow module *********************/