JavaScript - Load Image Using Try Catch

It must be a simple thing...

I am trying to change an image source on page load depending on the contents of a cookie:

Code:

function goVisited(cookiename,img_name,img_src) {
var visited = readCookie(cookiename);
if (visited == "1"){
//alert("visited!");
document[img_name].src=img_src;
}}

<img onload="goVisited('main1','Introduction','img/Yellow.gif');" name="Introduction" border="0" src="img/Green.gif" width="250" height="18">

I need the page to check the cookie "main1" and if its value is 1, then change the image src from Green.gif to Yellow.gif.

It almost works, but I get a stack overflow.

I used DrDOS's solution from http://www.codingforums.com/showpost...17&postcount=8

and modyfied it a bit so I have 2 images, first without and 2nd with a link to other page.

It works just fine in FF but in Chrome and in IE it shows just 2nd image. On place where first image shall be it's just blank white space. I have javascript enabled in all browsers, btw.

Here's a code in head:
Code:

<script type="text/javascript">

function loadImg()

	{

	document.getElementById("loadimg").innerHTML="<img src=\"logo2.png\"";

	}
	
	
	function loadImg2()

	{

	document.getElementById("loadimg2").innerHTML="<a href=\"http://site.com\"><img src=\"logo2.png\"</a>";

	}

</script>

And here's body part:
Code:

<div class="bottleft">

<div id="loadimg"></div>

<script type="text/javascript">var myimg = setTimeout("loadImg();",5000);</script>

  </div>
  
  <div class="bottright">
	
	<div id="loadimg2"></div>

<script type="text/javascript">var myimg = setTimeout("loadImg2();",5000);</script>

  </div>

I'm trying to figure out this whole day but just can't see where I am making a mistake?

How can I make it to where an image will load in the corner of a website?

Specifically, I have part of a template I want all people to see, however, some people either get it cut off or not shown at all because of their resolution.

Hello,

Can anyone figure out whats going on with this page and i need to finish the site by this evening? It is a wordpress site. the background image is shifting to the right on IE7 after the page loads on only the homepage. I think its the slider but im not sure

www.grapevineoutreach.org

thanks

Hello all. I'm sure this is really easy, but I have a question about being able to change a main image depending on a mouseover of particular text. I have a website where I am hosting a recipe, and I want to be able to show a 'main' picture that changes depending on where the user is hovering in the instructions. It would be very similar to this:

http://piscesmike.com/Pages/recipes/onions.html

The exception being that the top images are replaced by line by line instructions, and the main image changes depending on which instruction you are hovering on. Alternatively, I could also use a pop-up window with the image for the particular instruction, but could not get that to work either. I coded everything for the above link, but just cant seem to get this working. Any help is greatly appreciated. And, also feel free to try out the recipe's from PiscesMike.com, or to poke around. I know there are a few other errors (one being the day of the week deal) so once again, any input or help would be a tremendous help. Thanks and sorry for being such a noob!

Basically I want an effect like this: http://www.appelsiini.net/projects/l...ed_fadein.html

Where the images on the page fade in as the user scrolls down.
I implemented the code on a page, he http://www.jamiewebster.co.uk/orca.html

Now, I have a couple of issues with this. First issue, it works in FF but it doesn't seem to work in Chrome.

Second issue, I can see the alt text of the images below just above the fold of the page before the image loads (I guess it depends on your monitor size on wether you'll see it or not, but its still a problem!)

Thirdly, it seems that once the images have loaded, if you scroll back up you no longer have the fade effect and it only happens once (unless you refresh the page) - would be good if that effect could happen every time you scroll.

Any ideas, or if there is better code out there?

Thanks in advance!!

I've got a function that returns the value of a radio button group. However the application allows to "hide" some groups on others responses and that effectively make the radio groups not exist. This causes issues with calculations using the total value of the groups combined. I need a way to return a value of '0.00' IF the function does not find the group/returns an error.This is what I currently got to but doesnt work. The function does not work at all.
Code:

function  funcRadioCalc(RadioName)
{
var chkList1= document.getElementById (RadioName);
var arrayOfCheckBoxes= chkList1.getElementsByTagName("input");
var bob;
try {
	for( var i=0;i<arrayOfCheckBoxes.length;i++){
		if (arrayOfCheckBoxes[i].checked) {
		bob= arrayOfCheckBoxes[i].value;
		if (bob!=undefined||bob!=""){
			throw "yep";
		}else{
			throw "nope";
		}
	}
}
catch (er){
	if(er=="nope")
    {
    	return "0.00";
    }
  if(er=="yep")
    {
		return bob;
	}
}
}

Hi all,

I have a question about following code. It is tested as working well but the problem is that I need to catch values of array registos from javascript function getData(dataSource, sql_str) in PHP and not only update values of each form element. Can you help me, plz?

Code:

<script language = "javascript">
function getData(dataSource, sql_str){
	if (window.XMLHttpRequest){
		xmlhttp=new XMLHttpRequest();
	}
	else{
		xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	xmlhttp.onreadystatechange=function(){
		if (xmlhttp.readyState==4 && xmlhttp.status==200){
			var registos = eval('('+xmlhttp.responseText+')');
			document.getElementById("id_1").value=registos["cliente"];
			document.getElementById("id_2").value=registos["designacao"];
		}
	}
	xmlhttp.open("GET", dataSource+"&sql_str="+sql_str,true);
	xmlhttp.send();
}
</script>

<?php
$sql_str="SELECT cliente, designacao WHERE cliente = '$cliente'";

$record=$db->sql_query($sql_str);
list($registos[cliente], $registos[designacao]) = $db->sql_fetchrow($record);

echo "<form id=\"form\">";
echo 	"<input type=\"text\" id=\"id_1\" name=\"registos[cliente]\" value=\"".$registos[cliente])."\">";
echo 	"<br>";
echo 	"<input type=\"text\" id=\"id_2\" name=\"registos[designacao]\" value=\"".$registos[designacao]."\">";	
echo 	"<br>";
echo 	"<input type=\"button\" value=\"CONFIRMAR\" onclick=\"getData('mysql_query.php', '".base64_encode(serialize($sql_str))."')\">";
echo "</form>";

What happens in Javascript when you do not catch a thrown exception?
Does the script get terminated prematurely?

If you try some codes and then catch exception, it should catch the exception when there is. However, if there is a setInterval method in the try clause, then the exception cannot be caught... why???

the following works ( a usual method is invoked in the try clause):
Code:

<script language="javascript" type="text/javascript">
function invoke()
{   var i=0;    
    return i.x.y;
}

try
{
      alert(invoke());     
}  
catch(ex){ alert(ex); } //Any Exception will be caught.
</script>

if the highlighted line is changed as below (using setInterval method), then it fails...
Code:

<script language="javascript" type="text/javascript">
function invoke()
{   var i=0;    
    return i.x.y;
}

try
{
      setInterval(alert('invoke())',1000);     
}  
catch(ex){ alert(ex); } //The Exception will NOT be caught.
</script>

any idea? thx in advance

How do you make an image begin to load after a certain amount of time? e.g 3 seconds.

Ok, basically I am using the script bellow to produce a javascript slideshow similar to this: http://www.valvesoftware.com/ but instead of the red boxes I want an image representing each slide.

My problem is, I can't figure out how to call in a different image for each of these tabs (Paginates).

Any help would be much appreciated, thanks.

HEAD: Code:

<style type="text/css">
/*<![CDATA[*/

#tst {
  position:relative;width:880px;height:400px;
}

#paginate {
  position:absolute;z-Index:4;left:760px;top:15px;height:20px;
}

#paginate .default {
  position:relative;width:100px;height:50px;margin-bottom:27px;border:solid black 1px;background:url(images/imagehold.png);
}

#paginate .active {
  background:url(images/imagehold_o.png);
}

/*]]>*/
</style><script type="text/javascript">
// Animate (24-June-2011)
// by Vic Phillips http://www.vicsjavascripts.org.uk

// To progressively change the Left, Top, Width, Height or Opacity of an element over a specified period of time.
// With the ability to scale the effect time on specified minimum/maximum values
// and with three types of progression 'sin' and 'cos' and liner.

// The functional code size is 1.39K

// **** Application Notes

// **** The HTML Code
//
// when moving an element the inline or class rule style position of the element should be assigned as
// 'position:relative;' or 'position:absolute;'
//
// The element would normally be assigned a unique ID name.
//

// **** Initialising the Script.
//
// The script is initialised by assigning an instance of the script to a variable.
// e.g A = new zxcAnimate('left','id1')
// whe 
//  A           = a global variable                                                               (variable)
//  parameter 0 = the mode(see Note 1).                                                           (string)
//  parameter 1 = the unique ID name or element object.                                           (string or element object)
//  parameter 2 = the initial value.                                                              (digits, default = 0)

// **** Executing the Effect
//
// The effect is executed by an event call to function 'A.animate(10,800 ,5000,[10,800]);'
// whe 
//  A           = the global referencing the script instance.                                 (variable)
//  parameter 0 = the start value.                                                            (digits, for opacity minimum 0, maximum 100)
//  parameter 1 = the finish value.                                                           (digits, for opacity minimum 0, maximum 100)
//  parameter 2 =  period of time between the start and finish of the effect in milliseconds. (digits or defaults to previous or 0(on first call) milliSeconds)
//  parameter 3 = (optional) to scale the effect time on a specified minimum/maximum.         (array, see Note 3)
//                 field 0 the minimum value. (digits)
//                 field 1 the maximum value. (digits)
//  parameter 3 = (optional) the type of progression, 'sin', 'cos' or 'liner'.                (string, default = 'liner')
//                 'sin' progression starts fast and ends slow.
//                 'cos' progression starts slow and ends fast.
//
//  Note 1:  Examples modes: 'left', 'top', 'width', 'height', 'opacity.
//  Note 2:  The default units(excepting opacity) are 'px'.
//           For hyphenated modes, the first character after the hyphen must be upper case, all others lower case.
//  Note 3:  The scale is of particular use when re-calling the effect
//           in mid progression to retain an constant rate of progression.
//  Note 4:  The current effect value is recorded in A.data[0].
//  Note 5:  A function may be called on completion of the effect by assigning the function
//           to the animator intance property .Complete.
//           e.g. [instance].Complete=function(){ alert(this.data[0]); };
//



// **** Functional Code - NO NEED to Change

function zxcAnimate(mde,obj,srt){
 this.to=null;
 this.obj=typeof(obj)=='object'?obj:document.getElementById(obj);
 this.mde=mde.replace(/\W/g,'');
 this.data=[srt||0];
 return this;
}

zxcAnimate.prototype={

 animate:function(srt,fin,ms,scale,c){
  clearTimeout(this.to);
  this.time=ms||this.time||0;
  this.data=[srt,srt,fin];
  this.mS=this.time*(!scale?1:Math.abs((fin-srt)/(scale[1]-scale[0])));
  this.c=typeof(c)=='string'?c.charAt(0).toLowerCase():this.c?this.c:'';
  this.inc=Math.PI/(2*this.mS);
  this.srttime=new Date().getTime();
  this.cng();
 },

 cng:function(){
  var oop=this,ms=new Date().getTime()-this.srttime,s=this.data[1],f=this.data[2],d=Math.floor(this.c=='s'?(f-s)*Math.sin(this.inc*ms)+s:this.c=='c'?f-(f-s)*Math.cos(this.inc*ms):(f-s)/this.mS*ms+s);
  d=Math.max(d,s<0||f<0?d:0);
  this.data[0]=d;
  this.apply();
  if (ms<this.mS){
   this.to=setTimeout(function(){oop.cng(); },10);
  }
  else {
   this.data[0]=this.data[2];
   this.apply();
   if (this.Complete) this.Complete(this);
  }
 },

 apply:function(){
  if (isFinite(this.data[0])){
   if (this.mde!='opacity') this.obj.style[this.mde]=this.data[0]+'px';
   else zxcOpacity(this.obj,this.data[0]);
  }
 }

}

function zxcOpacity(obj,opc){
 obj.style.filter='alpha(opacity='+opc+')';
 obj.style.opacity=obj.style.MozOpacity=obj.style.WebkitOpacity=obj.style.KhtmlOpacity=opc/100-.001;
}

</script>

BODY: Code:

<script  type="text/javascript">
/*<![CDATA[*/

function zxcFadeSlideShow(o){
 var obj=document.getElementById(o.ID),imgs=obj.getElementsByTagName('IMG'),z0=0,ary=[],ms=o.FadeDuration,hold=o.Hold,srt=o.AutoStart,pag=document.getElementById(o.PaginateID),pary=[],z1=0;
 for (;z0<imgs.length;z0++){
  imgs[z0].style.position='absolute';
  imgs[z0].style.zIndex=z0>0?'0':'2';
  imgs[z0].style.left='0px';
  imgs[z0].style.top='0px';
  zxcOpacity(imgs[z0],z0>0?0:100);
  ary[z0]=new zxcAnimate('opacity',imgs[z0],z0>0?0:100);
 }
 if (pag){
  this.cls=['default','default active'];
  for (;z1<ary.length;z1++){
   pary[z1]=document.createElement('DIV');
   pary[z1].className=this.cls[z1>0?0:1];
   pag.appendChild(pary[z1]);
   this.addevt(pary[z1],'mouseup','page',z1);
  }
 }
 this.ary=ary;
 this.pary=pary;
 this.lstp=pary[0];
 this.ms=typeof(ms)=='number'?ms:1000;
 this.hold=(typeof(hold)=='number'?hold:1000)+this.ms;
 this.srt=typeof(srt)=='number'?srt+this.ms:false;
 this.to=null;
 this.cnt=0;
 this.lst=ary[this.cnt];
 this.Auto(this.hold);
}

zxcFadeSlideShow.prototype={

 Next:function(cnt,goto){
  this.Pause();
  if (this.lstp){
   this.lstp.className=this.cls[0];
  }
  this.lst.obj.style.zIndex='0';
  this.lst.animate(this.lst.data[0],0,this.ms,[0,100]);
  this.lst=this.ary[cnt];
  this.lst.obj.style.zIndex='2';
  this.lst.animate(this.lst.data[0],100,this.ms,[0,100]);
  if (this.pary[cnt]){
   this.lstp=this.pary[cnt];
   this.lstp.className=this.cls[1];
  }
  this.cnt=cnt;
  if (goto&&this.srt){
   var oop=this;
   this.to=setTimeout(function(){ oop.auto(); },this.srt);

  }
 },

 page:function(nu){
  this.Next(nu,true);
 },

 addevt:function(o,t,f,p){
  var oop=this;
  if (o.addEventListener) o.addEventListener(t,function(e){ return oop[f](p);}, false);
  else if (o.attachEvent) o.attachEvent('on'+t,function(e){ return oop[f](p); });
 },

 Auto:function(ms){
  var oop=this;
  this.to=setTimeout(function(){ oop.auto(); },ms||500);
 },

 Pause:function(){
  clearTimeout(this.to);
 },

 auto:function(){
  this.Pause();
  var oop=this,cnt=this.cnt;
  cnt=++cnt%this.ary.length;
  this.to=setTimeout(function(){ oop.Next(cnt); oop.auto(); },this.hold);
 }


}

S=new zxcFadeSlideShow({
 ID:'tst',              //(optional) unique ID name of the paent DIV.                   (string )
 PaginateID:'paginate', //(optional) unique ID name of the paginate DIV.                (string, default = no pagination)
 FadeDuration:1000,     //(optional) the fade duration in milli seconds.                (number, default = 1000)
 Hold:6000,             //(optional) the 'hold' between auto rotation in milli seconds. (number, default = 1000)
 AutoStart:2000         //(optional) auto start after goto.                             (number, default = no auto start)
});

x=new zxcAnimate('opacity',document.getElementById('tst'))
//x.animate(0,100,1000)
/*]]>*/
</script>

I would like to create a link from one page to another.
Easy - I know. But I would like that link to to take me to a certain part of the other page, specifically towards the bottom of the page.

Is that possible to do? And if so, what are the different ways I can specify where in the page to go? (i.e. what are the parameters that I can play with)

Thanks!

Hi
I have some Javascript on my website http://www.restoreanddesign.co.uk
The top bar has 4 images on a random cycle on load up/ refresh. Im trying to validate the xhtml, but it is coming up with errors.

I dont understand javascript enough to be able to fix this. Anyone know what needs to be done to validate this javascript.

i have bolded/coloured the lines i think is causing the problems

--------------------------------------------------------------------

Code:

<script type="text/javascript" language="JavaScript">
// JavaScript Document

var imagenumber = 4 ;

var randomnumber = Math.random() ;

var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;

images = new Array

images[1] = "images/newtopbar.jpg"

images[2] = "images/newtopbar2.jpg"

images[3] = "images/newtopbar3.jpg"

images[4] = "images/newtopbar4.jpg"

 

var image = images[rand1]
function MM_swapImgRestore() { //v3.0
   var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc; 
  
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
     var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++) 
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
   var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) { 
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
   if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n]; 
   for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); 
   if(!x && d.getElementById) x=d.getElementById(n); return x;
} 

function MM_swapImage() { //v3.0
   var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3) 
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
 </script>