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View Full Version : Ultimate Fade-In Slideshow (v1.5) Error: 'length' is null or not an object



mike pritchard
05-15-2007, 10:37 AM
1) Script Title: Ultimate Fade-In Slideshow (v1.5)

2) Script URL (on DD): http://www.dynamicdrive.com/dynamicindex14/fadeinslideshow.htm

3) Describe problem: getting error "Error: 'length' is null or not an object".
I placed the js in an external file (although leaving it internal generates the same error).
Am running this script on a local install where i am testing. I uploaded it to www.pritchardwebpages.com but as this is a joomla website you will need to select 018_cc to view this template. I have included the code below.

Searched the forum, could not find this problem listed. Am not a javascript guru so could use some help.

External js is this:

/***********************************************
* Ultimate Fade-In Slideshow (v1.5): Dynamic Drive (http://www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for this script and 100s more.
***********************************************/

var fadeimages=new Array()
//SET IMAGE PATHS. Extend or contract array as needed
fadeimages[0]=["templates/018_cc/images/logo1.png", "", ""]
....
fadeimages[22]=["templates/018_cc/images/logo23.png", "", ""]


var fadebgcolor="#5A370D"

////NO need to edit beyond here/////////////

var fadearray=new Array() //array to cache fadeshow instances
var fadeclear=new Array() //array to cache corresponding clearinterval pointers

var dom=(document.getElementById) //modern dom browsers
var iebrowser=document.all

function fadeshow(theimages, fadewidth, fadeheight, borderwidth, delay, pause, displayorder){
this.pausecheck=pause
this.mouseovercheck=0
this.delay=delay
this.degree=10 //initial opacity degree (10%)
this.curimageindex=0
this.nextimageindex=1
fadearray[fadearray.length]=this
this.slideshowid=fadearray.length-1
this.canvasbase="canvas"+this.slideshowid
this.curcanvas=this.canvasbase+"_0"
if (typeof displayorder!="undefined")
theimages.sort(function() {return 0.5 - Math.random();}) //thanks to Mike (aka Mwinter) :)
this.theimages=theimages
this.imageborder=parseInt(borderwidth)
this.postimages=new Array() //preload images
for (p=0;p<theimages.length;p++){
this.postimages[p]=new Image()
this.postimages[p].src=theimages[p][0]
}

var fadewidth=fadewidth+this.imageborder*2
var fadeheight=fadeheight+this.imageborder*2

if (iebrowser&&dom||dom) //if IE5+ or modern browsers (ie: Firefox)
document.write('<div id="master'+this.slideshowid+'" style="position:relative;width:'+fadewidth+'px;height:'+fadeheight+'px;overflow:hidden;"><div id="'+this.canvasbase+'_0" style="position:absolute;width:'+fadewidth+'px;height:'+fadeheight+'px;top:0;left:0;filter:progid:DXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;-khtml-opacity:10;background-color:'+fadebgcolor+'"></div><div id="'+this.canvasbase+'_1" style="position:absolute;width:'+fadewidth+'px;height:'+fadeheight+'px;top:0;left:0;filter:progid:DXImageTransform.Microsoft.alpha(opacity=10);-moz-opacity:10;background-color:'+fadebgcolor+'"></div></div>')
else
document.write('<div><img name="defaultslide'+this.slideshowid+'" src="'+this.postimages[0].src+'"></div>')

if (iebrowser&&dom||dom) //if IE5+ or modern browsers such as Firefox
this.startit()
else{
this.curimageindex++
setInterval("fadearray["+this.slideshowid+"].rotateimage()", this.delay)
}
}

function fadepic(obj){
if (obj.degree<100){
obj.degree+=10
if (obj.tempobj.filters&&obj.tempobj.filters[0]){
if (typeof obj.tempobj.filters[0].opacity=="number") //if IE6+
obj.tempobj.filters[0].opacity=obj.degree
else //else if IE5.5-
obj.tempobj.style.filter="alpha(opacity="+obj.degree+")"
}
else if (obj.tempobj.style.MozOpacity)
obj.tempobj.style.MozOpacity=obj.degree/101
else if (obj.tempobj.style.KhtmlOpacity)
obj.tempobj.style.KhtmlOpacity=obj.degree/100
}
else{
clearInterval(fadeclear[obj.slideshowid])
obj.nextcanvas=(obj.curcanvas==obj.canvasbase+"_0")? obj.canvasbase+"_0" : obj.canvasbase+"_1"
obj.tempobj=iebrowser? iebrowser[obj.nextcanvas] : document.getElementById(obj.nextcanvas)
obj.populateslide(obj.tempobj, obj.nextimageindex)
obj.nextimageindex=(obj.nextimageindex<obj.postimages.length-1)? obj.nextimageindex+1 : 0
setTimeout("fadearray["+obj.slideshowid+"].rotateimage()", obj.delay)
}
}

fadeshow.prototype.populateslide=function(picobj, picindex){
var slideHTML=""
if (this.theimages[picindex][1]!="") //if associated link exists for image
slideHTML='<a href="'+this.theimages[picindex][1]+'" target="'+this.theimages[picindex][2]+'">'
slideHTML+='<img src="'+this.postimages[picindex].src+'" border="'+this.imageborder+'px">'
if (this.theimages[picindex][1]!="") //if associated link exists for image
slideHTML+='</a>'
picobj.innerHTML=slideHTML
}


fadeshow.prototype.rotateimage=function(){
if (this.pausecheck==1) //if pause onMouseover enabled, cache object
var cacheobj=this
if (this.mouseovercheck==1)
setTimeout(function(){cacheobj.rotateimage()}, 100)
else if (iebrowser&&dom||dom){
this.resetit()
var crossobj=this.tempobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
crossobj.style.zIndex++
fadeclear[this.slideshowid]=setInterval("fadepic(fadearray["+this.slideshowid+"])",70) <!-- SSSS sets fade speed default 50-->
this.curcanvas=(this.curcanvas==this.canvasbase+"_0")? this.canvasbase+"_1" : this.canvasbase+"_0"
}
else{
var ns4imgobj=document.images['defaultslide'+this.slideshowid]
ns4imgobj.src=this.postimages[this.curimageindex].src
}
this.curimageindex=(this.curimageindex<this.postimages.length-1)? this.curimageindex+1 : 0
}

fadeshow.prototype.resetit=function(){
this.degree=10
var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
if (crossobj.filters&&crossobj.filters[0]){
if (typeof crossobj.filters[0].opacity=="number") //if IE6+
crossobj.filters(0).opacity=this.degree
else //else if IE5.5-
crossobj.style.filter="alpha(opacity="+this.degree+")"
}
else if (crossobj.style.MozOpacity)
crossobj.style.MozOpacity=this.degree/101
else if (crossobj.style.KhtmlOpacity)
crossobj.style.KhtmlOpacity=obj.degree/100
}


fadeshow.prototype.startit=function(){
var crossobj=iebrowser? iebrowser[this.curcanvas] : document.getElementById(this.curcanvas)
this.populateslide(crossobj, this.curimageindex)
if (this.pausecheck==1){ //IF SLIDESHOW SHOULD PAUSE ONMOUSEOVER
var cacheobj=this
var crossobjcontainer=iebrowser? iebrowser["master"+this.slideshowid] : document.getElementById("master"+this.slideshowid)
crossobjcontainer.onmouseover=function(){cacheobj.mouseovercheck=1}
crossobjcontainer.onmouseout=function(){cacheobj.mouseovercheck=0}
}
this.rotateimage()
}

Code for index.php page is this:
<?php defined( "_VALID_MOS" ) or die( "Direct Access to this location is not allowed." );?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<?php if ( $my->id ) { initEditor(); } ?>
<meta http-equiv="Content-Type" content="text/html;><?php echo _ISO; ?>" />
<?php mosShowHead(); ?>
<?php echo "<link rel=\"shortcut icon\" href=\"$GLOBALS[mosConfig_live_site]/templates/<?php echo $cur_template; ?>/favicon.ico\" />" ; ?>
<?php echo "<link rel=\"stylesheet\" href=\"$GLOBALS[mosConfig_live_site]/templates/$GLOBALS[cur_template]/css/template_css.css\" type=\"text/css\"/>" ; ?>
<script type="text/javascript" src="<?php echo $mosConfig_live_site;?>/templates/<?php echo $cur_template; ?>/js/fader.js"></script>
/***********************************************
* Ultimate Fade-In Slideshow (v1.5): Dynamic Drive (http://www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for this script and 100s more.
***********************************************/
<title><?php echo $mosConfig_live_site;?></title>
</head>

....

<!-- START OF MAIN TABLE -->
<table width=540 border=0 bordercolor=blue cellpadding=0 cellspacing=0><tr><td valign=top colspan=3>
<script type="text/javascript"><!-- LOGO FADER BELOW-->
//new fadeshow(IMAGES_ARRAY_NAME, slideshow_width, slideshow_height, borderwidth, delay, pause (0=no, 1=yes), optionalRandomOrder)
new fadeshow(fadeimages, 766, 187, 0, 5000, 1, "R")
</script>


.....</html>

"length" in only used in the external js file which i copied straight from the dd site.

The script works well, but i keep getting that error.
Any help would sure be appreciated as I don't know what else to try.

Thanks so much,
Mike
PS if you go to the website you will see the other problem i am having, which is the slide show plays all the way through before all the images will load on the page. Haven't found an answer for that yet either.

mike pritchard
05-15-2007, 11:41 AM
Ahhhhhhhh, now i really feel dumb.
Rebooted and problem solved, except for that all the fader images have to load before the page finishes loading.

If you know a solution for that, it would be cool.
thanks,
mike

jscheuer1
05-15-2007, 03:14 PM
Swiss Army Slide Show:

http://www.dynamicdrive.com/dynamicindex14/swissarmy/index.htm

Can be configured to look just like Ultimate fade-in slide show and uses a similar (not exactly the same) array of images. However, it incrementally loads the fading images, three to start out and two more with each fade-in until all are loaded.

Notes: In IE, if one of your images is missing (not on the server), the script will stop. In all browsers, if an image is taking a while to load, the script will wait until it is loaded to begin fading it in.