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] - offsets[0]);
> this.offsetY = (pointer[1] - offsets[1]);
> } else {
> // find the handle (prevents issues with Safari)
> while((this.handles.indexOf(handle) == -1) &&
> handle.parentNode)
> handle = handle.parentNode;
>
> if(this.handles.indexOf(handle)!=-1) {
> this.activeHandle = handle;
> this.activeHandleIdx =
> this.handles.indexOf(this.activeHandle);
> this.updateStyles();
>
> var offsets =
> Position.cumulativeOffset(this.activeHandle);
> this.offsetX = (pointer[0] - offsets[0]);
> this.offsetY = (pointer[1] - offsets[1]);
> }
> }
> }
> Event.stop(event);
> }
> },
> update: function(event) {
> if(this.active) {
> if(!this.dragging) this.dragging = true;
> this.draw(event);
> // fix AppleWebKit rendering
> if(navigator.appVersion.indexOf('AppleWebKit')>0)
> window.scrollBy(0,0);
> Event.stop(event);
> }
> },
> draw: function(event) {
> var pointer = [Event.pointerX(event), Event.pointerY(event)];
> var offsets = Position.cumulativeOffset(this.track);
> pointer[0] -= this.offsetX + offsets[0];
> pointer[1] -= this.offsetY + offsets[1];
> this.event = event;
> this.setValue(this.translateToValue( this.isVertical() ?
> pointer[1] : pointer[0] ));
> if(this.initialized && this.options.onSlide)
> this.options.onSlide(this.values.length>1 ? this.values :
> this.value, this);
> },
> endDrag: function(event) {
> if(this.active && this.dragging) {
> this.finishDrag(event, true);
> Event.stop(event);
> }
> this.active = false;
> this.dragging = false;
> },
> finishDrag: function(event, success) {
> this.active = false;
> this.dragging = false;
> this.updateFinished();
> },
> updateFinished: function() {
> if(this.initialized && this.options.onChange)
> this.options.onChange(this.values.length>1 ? this.values :
> this.value, this);
> this.event = null;
> }
>
> }
>
> My question is how can I enable the text-link buttons I have created
> (scroll left/scroll right) to move the scroll bar together with the
> div content along? If it’s not possible with the code I’ve used is
> there a better solution I could use? Any help would be greatly
> appreciated!
>
> Dave Vernon
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