Hi Diodeus,

Thanks for you quick reply! That works, but it only moves one
increment on the first click. How can I get it to keep moving along
when the linked is clicked repeatedly? Do I need to set up a loop of
some kind? Sorry, my knowledge of javascript is very limited!



On Oct 9, 6:03 pm, Diodeus <[EMAIL PROTECTED]> wrote:
> First you need to store your current slider position when the scroll
> occurs. Then set the slider position to this value +/- your increment
> when the link is clicked.
>
> <a href="javascript://" onclick="slider2.setValue(slidePos+.1)">scroll
> right</a>
>
> var slidePos = 0
>
> var slider2 = new Control.Slider('handle2', 'track2', {
>         onSlide: function(v) { scrollHorizontal(v, $('scrollable1'),
> slider2);  },
>         onChange: function(v) { scrollHorizontal(v, $('scrollable1'),
> slider2);slidePos=v }
>
> });
>
> On Oct 9, 12:10 pm, djvern <[EMAIL PROTECTED]> wrote:
>
> > Hi,
>
> > I am using a Scriptaculous slider to scroll a div but I want to be
> > able to control the position of the scroller using buttons too. See my
> > example here:
>
> >http://www.stickycreation.co.uk/laurus/scroll_testX.html
>
> > This file links to the prototype framework and the js file slider.js,
> > which contains the following code:
>
> > // script.aculo.us slider.js v1.6.5, Wed Nov 08 14:17:49 CET 2006
>
> > // Copyright (c) 2005, 2006 Marty Haught, Thomas Fuchs
> > //
> > // script.aculo.us is freely distributable under the terms of an MIT-
> > style license.
> > // For details, see the script.aculo.us web site: <a href="http://
> > script.aculo.us/">http://script.aculo.us/</a>
>
> > if(!Control) var Control = {};
> > Control.Slider = Class.create();
>
> > // options:
> > //  axis: 'vertical', or 'horizontal' (default)
> > //
> > // callbacks:
> > //  onChange(value)
> > //  onSlide(value)
> > Control.Slider.prototype = {
> >   initialize: function(handle, track, options) {
> >     var slider = this;
>
> >     if(handle instanceof Array) {
> >       this.handles = handle.collect( function(e) { return $(e) });
> >     } else {
> >       this.handles = [$(handle)];
> >     }
>
> >     this.track   = $(track);
> >     this.options = options || {};
>
> >     this.axis      = this.options.axis || 'horizontal';
> >     this.increment = this.options.increment || 1;
> >     this.step      = parseInt(this.options.step || '1');
> >     this.range     = this.options.range || $R(0,1);
>
> >     this.value     = 0; // assure backwards compat
> >     this.values    = this.handles.map( function() { return 0 });
> >     this.spans     = this.options.spans ?
> > this.options.spans.map(function(s){ return $(s) }) : false;
> >     this.options.startSpan = $(this.options.startSpan || null);
> >     this.options.endSpan   = $(this.options.endSpan || null);
>
> >     this.restricted = this.options.restricted || false;
>
> >     this.maximum   = this.options.maximum || this.range.end;
> >     this.minimum   = this.options.minimum || this.range.start;
>
> >     // Will be used to align the handle onto the track, if necessary
> >     this.alignX = parseInt(this.options.alignX || '0');
> >     this.alignY = parseInt(this.options.alignY || '0');
>
> >     this.trackLength = this.maximumOffset() - this.minimumOffset();
>
> >     this.handleLength = this.isVertical() ?
> >       (this.handles[0].offsetHeight != 0 ?
> >         this.handles[0].offsetHeight :
> > this.handles[0].style.height.replace(/px$/,"")) :
> >       (this.handles[0].offsetWidth != 0 ?
> > this.handles[0].offsetWidth :
> >         this.handles[0].style.width.replace(/px$/,""));
>
> >     this.active   = false;
> >     this.dragging = false;
> >     this.disabled = false;
>
> >     if(this.options.disabled) this.setDisabled();
>
> >     // Allowed values array
> >     this.allowedValues = this.options.values ?
> > this.options.values.sortBy(Prototype.K) : false;
> >     if(this.allowedValues) {
> >       this.minimum = this.allowedValues.min();
> >       this.maximum = this.allowedValues.max();
> >     }
>
> >     this.eventMouseDown = this.startDrag.bindAsEventListener(this);
> >     this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
> >     this.eventMouseMove = this.update.bindAsEventListener(this);
>
> >     // Initialize handles in reverse (make sure first handle is
> > active)
> >     this.handles.each( function(h,i) {
> >       i = slider.handles.length-1-i;
> >       slider.setValue(parseFloat(
> >         (slider.options.sliderValue instanceof Array ?
> >           slider.options.sliderValue[i] : slider.options.sliderValue)
> > ||
> >          slider.range.start), i);
> >       Element.makePositioned(h); // fix IE
> >       Event.observe(h, "mousedown", slider.eventMouseDown);
> >     });
>
> >     Event.observe(this.track, "mousedown", this.eventMouseDown);
> >     Event.observe(document, "mouseup", this.eventMouseUp);
> >     Event.observe(document, "mousemove", this.eventMouseMove);
>
> >     this.initialized = true;
> >   },
> >   dispose: function() {
> >     var slider = this;
> >     Event.stopObserving(this.track, "mousedown", this.eventMouseDown);
> >     Event.stopObserving(document, "mouseup", this.eventMouseUp);
> >     Event.stopObserving(document, "mousemove", this.eventMouseMove);
> >     this.handles.each( function(h) {
> >       Event.stopObserving(h, "mousedown", slider.eventMouseDown);
> >     });
> >   },
> >   setDisabled: function(){
> >     this.disabled = true;
> >   },
> >   setEnabled: function(){
> >     this.disabled = false;
> >   },
> >   getNearestValue: function(value){
> >     if(this.allowedValues){
> >       if(value >= this.allowedValues.max())
> > return(this.allowedValues.max());
> >       if(value <= this.allowedValues.min())
> > return(this.allowedValues.min());
>
> >       var offset = Math.abs(this.allowedValues[0] - value);
> >       var newValue = this.allowedValues[0];
> >       this.allowedValues.each( function(v) {
> >         var currentOffset = Math.abs(v - value);
> >         if(currentOffset <= offset){
> >           newValue = v;
> >           offset = currentOffset;
> >         }
> >       });
> >       return newValue;
> >     }
> >     if(value > this.range.end) return this.range.end;
> >     if(value < this.range.start) return this.range.start;
> >     return value;
> >   },
> >   setValue: function(sliderValue, handleIdx){
> >     if(!this.active) {
> >       this.activeHandleIdx = handleIdx || 0;
> >       this.activeHandle    = this.handles[this.activeHandleIdx];
> >       this.updateStyles();
> >     }
> >     handleIdx = handleIdx || this.activeHandleIdx || 0;
> >     if(this.initialized && this.restricted) {
> >       if((handleIdx>0) && (sliderValue<this.values[handleIdx-1]))
> >         sliderValue = this.values[handleIdx-1];
> >       if((handleIdx < (this.handles.length-1)) &&
> > (sliderValue>this.values[handleIdx+1]))
> >         sliderValue = this.values[handleIdx+1];
> >     }
> >     sliderValue = this.getNearestValue(sliderValue);
> >     this.values[handleIdx] = sliderValue;
> >     this.value = this.values[0]; // assure backwards compat
>
> >     this.handles[handleIdx].style[this.isVertical() ? 'top' : 'left']
> > =
> >       this.translateToPx(sliderValue);
>
> >     this.drawSpans();
> >     if(!this.dragging || !this.event) this.updateFinished();
> >   },
> >   setValueBy: function(delta, handleIdx) {
> >     this.setValue(this.values[handleIdx || this.activeHandleIdx || 0]
> > + delta,
> >       handleIdx || this.activeHandleIdx || 0);
> >   },
> >   translateToPx: function(value) {
> >     return Math.round(
> >       ((this.trackLength-this.handleLength)/(this.range.end-
> > this.range.start)) *
> >       (value - this.range.start)) + "px";
> >   },
> >   translateToValue: function(offset) {
> >     return ((offset/(this.trackLength-this.handleLength) *
> >       (this.range.end-this.range.start)) + this.range.start);
> >   },
> >   getRange: function(range) {
> >     var v = this.values.sortBy(Prototype.K);
> >     range = range || 0;
> >     return $R(v[range],v[range+1]);
> >   },
> >   minimumOffset: function(){
> >     return(this.isVertical() ? this.alignY : this.alignX);
> >   },
> >   maximumOffset: function(){
> >     return(this.isVertical() ?
> >       (this.track.offsetHeight != 0 ? this.track.offsetHeight :
> >         this.track.style.height.replace(/px$/,"")) - this.alignY :
> >       (this.track.offsetWidth != 0 ? this.track.offsetWidth :
> >         this.track.style.width.replace(/px$/,"")) - this.alignY);
> >   },
> >   isVertical:  function(){
> >     return (this.axis == 'vertical');
> >   },
> >   drawSpans: function() {
> >     var slider = this;
> >     if(this.spans)
> >       $R(0, this.spans.length-1).each(function(r)
> > { slider.setSpan(slider.spans[r], slider.getRange(r)) });
> >     if(this.options.startSpan)
> >       this.setSpan(this.options.startSpan,
> >         $R(0, this.values.length>1 ? this.getRange(0).min() :
> > this.value ));
> >     if(this.options.endSpan)
> >       this.setSpan(this.options.endSpan,
> >         $R(this.values.length>1 ?
> > this.getRange(this.spans.length-1).max() : this.value, this.maximum));
> >   },
> >   setSpan: function(span, range) {
> >     if(this.isVertical()) {
> >       span.style.top = this.translateToPx(range.start);
> >       span.style.height = this.translateToPx(range.end - range.start +
> > this.range.start);
> >     } else {
> >       span.style.left = this.translateToPx(range.start);
> >       span.style.width = this.translateToPx(range.end - range.start +
> > this.range.start);
> >     }
> >   },
> >   updateStyles: function() {
> >     this.handles.each( function(h){ Element.removeClassName(h,
> > 'selected') });
> >     Element.addClassName(this.activeHandle, 'selected');
> >   },
> >   startDrag: function(event) {
> >     if(Event.isLeftClick(event)) {
> >       if(!this.disabled){
> >         this.active = true;
>
> >         var handle = Event.element(event);
> >         var pointer  = [Event.pointerX(event), Event.pointerY(event)];
> >         var track = handle;
> >         if(track==this.track) {
> >           var offsets  = Position.cumulativeOffset(this.track);
> >           this.event = event;
> >           this.setValue(this.translateToValue(
> >            (this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-
> > offsets[0])-(this.handleLength/2)
> >           ));
> >           var offsets  = Position.cumulativeOffset(this.activeHandle);
> >           this.offsetX = (pointer[0] -
>
> ...
>
> read more »
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