Well, I don't see anything. The source of slider.js might help. The only
thing is that you load a JavaScript library ( <script
src="..."></script> ) and then later on use it in the document ( slider1
= new Slider()). The browser doesn't guarantee that slider.js code is
already loaded at the point that it is created. but if it wouldn't work
I'd expect another error message though, not a stack overflow.
Vincent,
I have copied the slider.js contents below. One odd thing - I
suggested that the people seeing this stack overflow might try Firefox
- they did and the error message is no longer there!
I have also carried out some HTML validation on the 2 pages and have
asked that the users to try the new pages. Have not had any response
yet. I understand from other people that bad HTML should not cause
stack oversflows but we will see.
Anything in the slider.js file?
Cheers
Geoff
/****************************************************************
* Slider
*
* Slider050723
* by Christiaan Hofman, July 2005
*
* You may use or modify this code provided that this copyright notice
* appears on all copies.
*
* Constructor:
* var slider = new Slider( [name] );
* (default: name = "slider0", "slider1", ...)
*
* Creating Methods
* slider.writeSlider();
* slider.placeSlider( [imgName] );
* (default: imgName = name+"RailImg")
*
* Control Methods:
* slider.getValue();
* slider.setValue( [value] );
*
* Event Handlers:
* slider.onmouseover( e );
* slider.onmouseout( e );
* slider.onmousedown( e );
* slider.onmouseup( e );
* slider.onslide( e );
* slider.onchange( e );
* slider.onclick( e );
*
* Default Initial Settings:
*
* slider.leftValue = 0;
* slider.rightValue = 1;
* slider.defaultValue = 0;
* slider.offsetX = 1;
* slider.offsetY = 1;
* slider.maxSlide = 258;
* slider.buttonWidth = 40;
* slider.buttonHeight = 28;
* slider.buttonImg = "sliderbutton.gif";
* slider.buttonHiliteImg = "sliderhibutton.gif";
* slider.imgPath = "";
* slider.orientation = "h";
*
****************************************************************
* EXAMPLE:
*
* <html>
* <head>
* <script language="javascript" src="slider.js"></script>
* <script language="javascript">
* mySlider = new Slider( "MySlider" );
* </script>
* </head>
* <body onload="mySlider.placeSlider()">
* <img src="sliderbg.gif" name="MySliderRailImg">
* <script language="javascript">
* mySlider.writeSlider();
* </script>
* </body>
* </html>
****************************************************************
*/
// Constructor
function Slider(name) {
this.leftValue = 0;
this.rightValue = 6;
this.defaultValue = 3;
this.offsetX = 1;
this.offsetY = 1;
this.maxSlide = 258;
this.buttonWidth = 40;
this.buttonHeight = 28;
this.buttonImg = "sliderbutton.gif";
this.buttonHiliteImg = "sliderhibutton.gif";
this.buttonHoverImg = null;
this.imgPath = "";
this.orientation = "h";
this.writeSlider = Slider.writeSlider;
this.placeSlider = Slider.placeSlider;
this.makeEventHandler = Slider.makeEventHandler;
this.isPrototype = Slider.isPrototype;
this.getValue = Slider.getValue;
this.setValue = Slider.setValue;
this.MouseOver = Slider.MouseOver;
this.MouseOut = Slider.MouseOut;
this.MouseDown = Slider.MouseDown;
this.MouseUp = Slider.MouseUp;
this.MouseSlide = Slider.MouseSlide;
this.onmouseover = null;
this.onmouseout = null;
this.onmousedown = null;
this.onmouseup = null;
this.onslide = null;
this.onchange = null;
this.onclick = null;
if (!window.sliders) window.sliders = new Array();
this.name = name || "slider"+window.sliders.length;
window.sliders[window.sliders.length] = this;
window.sliders[this.name] = this;
if (!window.sliderDrag) window.sliderDrag = new Object();
}
// method write the button DIV
Slider.writeSlider = function () {
if (!document.getElementById) return; // no W3C support
var proto = this.prototype || this;
// create images for the prototype, if not already set
if (!proto.loImg) {
proto.loImg = new Image(proto.buttonWidth,proto.buttonHeight);
proto.loImg.src = proto.imgPath + proto.buttonImg;
if (proto.buttonHiliteImg) {
proto.hiImg = new
Image(proto.buttonWidth,proto.buttonHeight);
proto.hiImg.src = proto.imgPath + (proto.buttonHiliteImg
|| proto.buttonImg);
}
if (proto.buttonHoverImg) {
proto.hoImg = new
Image(proto.buttonWidth,proto.buttonHeight);
proto.hoImg.src = proto.imgPath + proto.buttonHoverImg;
}
}
// set the properties according to the prototype
if (proto != this) {
this.loImg = proto.loImg;
if (proto.hiImg) this.hiImg = proto.hiImg;
if (proto.hoImg) this.hoImg = proto.hoImg;
this.orientation = proto.orientation;
this.maxSlide = proto.maxSlide;
}
// style for the slider button
var style = '<STYLE TYPE="text/css"><!--\n' +
'#'+this.name+'Button {visibility:hidden; position:absolute;
width:'+ proto.buttonWidth +'px; height:'+ proto.buttonHeight +'px;
z-index:1; }\n' +
'--></STYLE>';
// html for the button div
var content = '<DIV ID="'+this.name+'Button">'+
'<IMG ID="'+this.name+'ButtonImg" SRC="'+proto.loImg.src+'"
WIDTH='+proto.buttonWidth+' HEIGHT='+proto.buttonHeight+'>'+
'</DIV>';
// write the button style and content in the document
document.writeln(style);
document.writeln(content);
// set button properties and mouse event handlers
this.button = document.getElementById(this.name+"Button");
this.button.img =
document.getElementById(this.name+"ButtonImg");
this.button.style.width = proto.buttonWidth + 'px';
this.button.style.height = proto.buttonHeight + 'px';
if (this.button.addEventListener) {
this.button.addEventListener("mousedown",this.MouseDown,false);
this.button.addEventListener("mouseout",this.MouseOut,false);
this.button.addEventListener("mouseover",this.MouseOver,false);
} else {
this.button.onmousedown = this.MouseDown;
this.button.onmouseout = this.MouseOut;
this.button.onmouseover = this.MouseOver;
}
// set event handlers as functions
this.onmouseover = this.makeEventHandler(this.onmouseover);
this.onmouseout = this.makeEventHandler(this.onmouseout);
this.onmousedown = this.makeEventHandler(this.onmousedown);
this.onmouseup = this.makeEventHandler(this.onmouseup);
this.onslide = this.makeEventHandler(this.onslide);
this.onchange = this.makeEventHandler(this.onchange);
this.onclick = this.makeEventHandler(this.onclick);
// tell button who we are
this.button.slider = this;
// from now on button refers to the style object
this.button = this.button.style;
}
// method to put the slider button in place
Slider.placeSlider = function (imgName) {
if (!document.getElementById) return; // no W3C support
var proto = this.prototype || this;
// set name or default name
imgName = imgName || this.name+'RailImg';
// find the rail image
this.rail = (typeof(imgName) == 'string')?
document.getElementById(imgName) : imgName;
// offset w.r.t rail
var x = proto.offsetX;
var y = proto.offsetY;
// add global position of rail and parents in global document to
the offset
if (this.rail.offsetParent) {
var parent = this.rail;
while (parent) {
x += parent.offsetLeft;
y += parent.offsetTop;
parent = parent.offsetParent;
}
// Fix for IE 5 for Mac
if (navigator.userAgent.indexOf("MSIE")+1 &&
navigator.userAgent.indexOf("Mac")+1) {
x += parseInt(document.body.currentStyle.marginLeft);
y += parseInt(document.body.currentStyle.marginTop);
}
} else {
x += (typeof(this.rail.pageX) == 'number')? this.rail.pageX :
this.rail.x;
y += (typeof(this.rail.pageY) == 'number')? this.rail.pageY :
this.rail.y;
}
// set position of button
this.button.left = x + 'px';
this.button.top = y + 'px';
// offset is remembered for later sliding
this.offset = (proto.orientation == "v")? y : x;
// put button in default position and make visible
this.setValue(this.defaultValue);
this.button.visibility = 'inherit';
}
// makes slider a prototype for all previously defined sliders
Slider.isPrototype = function () {
for (var i=0; i<window.sliders.length; i++)
window.sliders
.prototype = window.sliders.prototype ||
this;
}
// mouseover handler of the button, only calls handler of slider
Slider.MouseOver = function (e) {
window.sliderDrag.isOver = true;
if (this.slider.hoImg && !window.sliderDrag.isDown) this.img.src
= this.slider.hoImg.src;
if (this.slider.onmouseover) this.slider.onmouseover(e);
}
// mouseout handler of the button, only calls handler of slider
Slider.MouseOut = function (e) {
window.sliderDrag.isOver = false;
if (this.slider.hoImg && !window.sliderDrag.isDown) this.img.src
= this.slider.loImg.src;
if (this.slider.onmouseout) this.slider.onmouseout(e);
}
// mousedown handler of the button
Slider.MouseDown = function (e) {
var slider = this.slider;
// remember me
window.sliderDrag.dragLayer = this;
window.sliderDrag.dragged = false;
window.sliderDrag.isDown = true;
// event position
var evtX = evtY = 0;
if (!e) e = window.event;
if (typeof(e.pageX) == 'number') {
evtX = e.pageX;
evtY = e.pageY;
} else if (typeof(e.clientX) == 'number') {
evtX = e.clientX + (document.body.scrollLeft || 0);
evtY = e.clientY + (document.body.scrollTop || 0);
}
// ignore right mouse button
if ((e.which && e.which == 3) || (e.button && e.button == 2))
return true;
// set starting offset of event
window.sliderDrag.offX = evtX - parseInt(this.style.left) +
slider.offset;
window.sliderDrag.offY = evtY - parseInt(this.style.top) +
slider.offset;
if (e.cancelable) e.preventDefault();
if (e.stopPropagation) e.stopPropagation();
e.cancelBubble = true;
// document handles move and up events
document.onmousemove = slider.MouseSlide;
document.onmouseup = slider.MouseUp;
if (document.captureEvents)
document.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);
// show hilite img
if (slider.hiImg) this.img.src = slider.hiImg.src;
// call event handler of slider
if (slider.onmousedown) slider.onmousedown(e);
return false;
}
// mouseup handler of the button
Slider.MouseUp = function (e) {
// button and slider that was draged
var l = window.sliderDrag.dragLayer;
var slider = l.slider;
window.sliderDrag.isDown = false;
// cancel move and up event handlers of document
document.onmousemove = null;
document.onmouseup = null;
if (document.releaseEvents)
document.releaseEvents(Event.MOUSEMOVE|Event.MOUSEUP);
window.sliderDrag.dragLayer = null;
// show normal image
if (slider.hiImg)
l.img.src = (window.sliderDrag.isOver && slider.hoImg)?
slider.hoImg.src : slider.loImg.src;
// cal event handlers of slider
if (slider.onmouseup) slider.onmouseup(e);
if (window.sliderDrag.dragged) {
if (slider.onchange) slider.onchange(e);
} else {
if (slider.onclick) slider.onclick(e);
}
return false;
}
// mousemove handler of the button for sliding
Slider.MouseSlide = function (e) {
// button and slider to be draged
var l = window.sliderDrag.dragLayer;
var slider = l.slider;
// we have dragged the slider; for click
window.sliderDrag.dragged = true;
// event position
var evtX = evtY = 0;
if (!e) e = window.event;
if (typeof(e.pageX) == 'number') {
evtX = e.pageX;
evtY = e.pageY;
} else if (typeof(e.clientX) == 'number') {
evtX = e.clientX + (document.body.scrollLeft || 0);
evtY = e.clientY + (document.body.scrollTop || 0);
}
var pos = (slider.orientation == "h")?
Math.max(Math.min(evtX -
window.sliderDrag.offX,slider.maxSlide),0) + slider.offset :
Math.max(Math.min(evtY -
window.sliderDrag.offY,slider.maxSlide),0) + slider.offset;
// move slider.
if (slider.orientation == "h") l.style.left = pos + 'px';
else l.style.top = pos + 'px';
if (e.cancelable) e.preventDefault();
if (e.stopPropagation) e.stopPropagation();
e.cancelBubble = true;
// call slider event handlers
if (slider.onchange) slider.onchange(e);
if (slider.onslide) slider.onslide(e);
return false;
}
// calculate the value of the slider from position
Slider.getValue = function (n) {
var pos = (this.orientation == "h")? parseInt(this.button.left) :
parseInt(this.button.top);
var val = this.leftValue + (this.rightValue-this.leftValue) *
(pos-this.offset) / this.maxSlide;
return (typeof(n) == 'number')? toDecimals(val,n) : val;
}
// set the position of the slider from a value
Slider.setValue = function (value,ignore) {
if (typeof(value) == 'string') value = parseFloat(value);
if (isNaN(value)) value = this.defaultValue;
// set within min/max bounds
var rangeValue = (this.rightValue >= this.leftValue)?
Math.min(Math.max(value,this.leftValue),this.rightValue) -
this.leftValue :
Math.max(Math.min(value,this.leftValue),this.rightValue) -
this.leftValue;
var pos = this.maxSlide * rangeValue /
(this.rightValue-this.leftValue) + this.offset + 'px';
// move button to calculated position
if (this.orientation == "h") this.button.left = pos;
else this.button.top = pos;
// call slider event handler, unless ignore is true
if (this.onchange && (!ignore)) this.onchange(null);
}
// make an event handler, ensuring that it is a function
Slider.makeEventHandler = function (f) {
return (typeof(f) == 'string')? new Function('e',f) : ((typeof(f)
== 'function')? f : null);
}
// return a value as a string with a fixed number of decimals
function toDecimals(val,n) {
if (isNaN(n)) return val;
for (var m=0; m<n; m++) val *= 10;
for (var m=0; m>n; m--) val *= 0.1;
val = Math.round(val);
if (val < 0) {
val = -val;
var sgn = "-";
} else {
var sgn = "";
}
var valstr = val.toString();
if (n>0) {
while (valstr.length<=n) valstr = "0"+valstr;
var len = valstr.length;
valstr = valstr.substring(0,len-n) +"."+
valstr.substring(len-n,len);
} else if (n<0) {
for (m=0; m>n; m--) valstr = valstr+"0";
}
return sgn+valstr;
}