Hi,
I begin to use jcarousel now, and I think it is verey very well maked.
I am not so expert in js so I have a need:
I have to external control for next and prevoius button and they
scroll fine. I want to take count of next and previous so I think to a
variable that take currPage + 1 for next and currPage - 1 for previous
to use it to make visible on the page an object based on what page I
am visiting in that moment. I hope to make you understand.
I think I have to put this in the jcarousel class and initialize it,
but I don't know exactly where.
I put here my code:
this is the script in the page
<script type="text/javascript">
/**
* We use the initCallback callback
* to assign functionality to the controls
*/
function mycarousel_initCallback(carousel) {
jQuery('.jcarousel-control a').bind('click', function() {
carousel.scroll(jQuery.jcarousel.intval(jQuery(this).text()));
return false;
});
jQuery('.jcarousel-scroll select').bind('change', function() {
carousel.options.scroll =
jQuery.jcarousel.intval(this.options[this.selectedIndex].value);
return false;
});
jQuery('#mycarousel-next').bind('click', function() {
carousel.next();
makevisible('vedi'+ carousel.currPage)
return false;
});
jQuery('#mycarousel-prev').bind('click', function() {
carousel.prev();
makevisible('vedi'+ carousel.currPage)
return false;
});
};
</script>
<script type="text/javascript">
// Ride the carousel...
jQuery(document).ready(function() {
jQuery("#mycarousel").jcarousel({
vertical: true,
scroll: 4,
initCallback: mycarousel_initCallback,
// This tells jCarousel NOT to autobuild prev/next buttons
buttonNextHTML: null,
buttonPrevHTML: null
});
// visualizzo la prima
makevisible('vedi1')
});
</script>
this is tha js class
/**
* jCarousel - Riding carousels with jQuery
* http://sorgalla.com/jcarousel/
*
* Copyright (c) 2006 Jan Sorgalla (http://sorgalla.com)
* Dual licensed under the MIT (MIT-LICENSE.txt)
* and GPL (GPL-LICENSE.txt) licenses.
*
* Built on top of the jQuery library
* http://jquery.com
*
* Inspired by the "Carousel Component" by Bill Scott
* http://billwscott.com/carousel/
*/
(function($) {
/**
* Creates a carousel for all matched elements.
*
* @example $("#mycarousel").jcarousel();
* @before <ul id="mycarousel"><li>First item</li><li>Second item</
li></ul>
* @result
*
* <div class="jcarousel-skin-name jcarousel-container">
* <div disabled="disabled" class="jcarousel-prev jcarousel-prev-
disabled"></div>
* <div class="jcarousel-next"></div>
* <div class="jcarousel-clip">
* <ul class="jcarousel-list">
* <li class="jcarousel-item-1">First item</li>
* <li class="jcarousel-item-2">Second item</li>
* </ul>
* </div>
* </div>
*
* @name jcarousel
* @type jQuery
* @param Hash o A set of key/value pairs to set as configuration
properties.
* @cat Plugins/jCarousel
*/
$.fn.jcarousel = function(o) {
return this.each(function() {
new $jc(this, o);
});
};
// Default configuration properties.
var defaults = {
vertical: false,
start: 1,
offset: 1,
size: null,
scroll: 3,
visible: null,
animation: 'normal',
easing: 'swing',
auto: 0,
wrap: null,
initCallback: null,
reloadCallback: null,
itemLoadCallback: null,
itemFirstInCallback: null,
itemFirstOutCallback: null,
itemLastInCallback: null,
itemLastOutCallback: null,
itemVisibleInCallback: null,
itemVisibleOutCallback: null,
buttonNextHTML: '<div></div>',
buttonPrevHTML: '<div></div>',
buttonNextEvent: 'click',
buttonPrevEvent: 'click',
buttonNextCallback: null,
buttonPrevCallback: null
};
/**
* The jCarousel object.
*
* @constructor
* @name $.jcarousel
* @param Object e The element to create the carousel for.
* @param Hash o A set of key/value pairs to set as configuration
properties.
* @cat Plugins/jCarousel
*/
$.jcarousel = function(e, o) {
this.options = $.extend({}, defaults, o || {});
this.locked = false;
this.container = null;
this.clip = null;
this.list = null;
this.buttonNext = null;
this.buttonPrev = null;
this.wh = !this.options.vertical ? 'width' : 'height';
this.lt = !this.options.vertical ? 'left' : 'top';
this.currPage = 1;
if (e.nodeName == 'UL' || e.nodeName == 'OL') {
this.list = $(e);
this.container = this.list.parent();
if ($.className.has(this.container[0].className,
'jcarousel-clip')) {
if (!
$.className.has(this.container[0].parentNode.className, 'jcarousel-
container'))
this.container = this.container.wrap('<div></
div>');
this.container = this.container.parent();
} else if (!$.className.has(this.container[0].className,
'jcarousel-container'))
this.container = this.list.wrap('<div></
div>').parent();
// Move skin class over to container
var split = e.className.split(' ');
for (var i = 0; i < split.length; i++) {
if (split[i].indexOf('jcarousel-skin') != -1) {
this.list.removeClass(split[i]);
this.container.addClass(split[i]);
break;
}
}
} else {
this.container = $(e);
this.list = $('ul,ol', e);
}
this.clip = this.list.parent();
if (!this.clip.length || !
$.className.has(this.clip[0].className, 'jcarousel-clip'))
this.clip = this.list.wrap('<div></div>').parent();
this.buttonPrev = $('.jcarousel-prev', this.container);
if (this.buttonPrev.size() == 0 &&
this.options.buttonPrevHTML != null)
this.buttonPrev =
this.clip.before(this.options.buttonPrevHTML).prev();
this.buttonPrev.addClass(this.className('jcarousel-prev'));
this.buttonNext = $('.jcarousel-next', this.container);
if (this.buttonNext.size() == 0 &&
this.options.buttonNextHTML != null)
this.buttonNext =
this.clip.before(this.options.buttonNextHTML).prev();
this.buttonNext.addClass(this.className('jcarousel-next'));
this.clip.addClass(this.className('jcarousel-clip'));
this.list.addClass(this.className('jcarousel-list'));
this.container.addClass(this.className('jcarousel-
container'));
var di = this.options.visible != null ?
Math.ceil(this.clipping() / this.options.visible) : null;
var li = $('li', this.list);
var self = this;
if (li.size() > 0) {
var wh = 0, i = this.options.offset;
li.each(function() {
self.format(this, i++);
wh += self.dimension(this, di);
});
this.list.css(this.wh, wh + 'px');
// Only set if not explicitly passed as option
if (!o || o.size == undefined)
this.options.size = li.size();
}
// For whatever reason, .show() does not work in Safari...
this.container.css('display', 'block');
this.buttonNext.css('display', 'block');
this.buttonPrev.css('display', 'block');
this.funcNext = function() { self.next(); };
this.funcPrev = function() { self.prev(); };
$(window).bind('resize', function() { self.reload(); });
if (this.options.initCallback != null)
this.options.initCallback(this, 'init');
this.setup();
};
// Create shortcut for internal use
var $jc = $.jcarousel;
$jc.fn = $jc.prototype = {
jcarousel: '0.2.1'
};
$jc.fn.extend = $jc.extend = $.extend;
$jc.fn.extend({
/**
* Setups the carousel.
*
* @name setup
* @type undefined
* @cat Plugins/jCarousel
*/
setup: function() {
this.first = null;
this.last = null;
this.prevFirst = null;
this.prevLast = null;
this.animating = false;
this.timer = null;
this.tail = null;
this.inTail = false;
if (this.locked)
return;
this.list.css(this.lt, this.pos(this.options.offset) +
'px');
var p = this.pos(this.options.start);
this.prevFirst = this.prevLast = null;
this.animate(p, false);
this.currPage = 1;
},
/**
* Clears the list and resets the carousel.
*
* @name reset
* @type undefined
* @cat Plugins/jCarousel
*/
reset: function() {
this.list.empty();
this.list.css(this.lt, '0px');
this.list.css(this.wh, '0px');
if (this.options.initCallback != null)
this.options.initCallback(this, 'reset');
this.setup();
},
/**
* Reloads the carousel and adjusts positions.
*
* @name reload
* @type undefined
* @cat Plugins/jCarousel
*/
reload: function() {
if (this.tail != null && this.inTail)
this.list.css(this.lt,
$jc.intval(this.list.css(this.lt)) + this.tail);
this.tail = null;
this.inTail = false;
this.currPage = 1;
if (this.options.reloadCallback != null)
this.options.reloadCallback(this);
if (this.options.visible != null) {
var self = this;
var di = Math.ceil(this.clipping() /
this.options.visible), wh = 0, lt = 0;
$('li', this.list).each(function(i) {
wh += self.dimension(this, di);
if (i + 1 < self.first)
lt = wh;
});
this.list.css(this.wh, wh + 'px');
this.list.css(this.lt, -lt + 'px');
}
this.scroll(this.first, false);
},
/**
* Locks the carousel.
*
* @name lock
* @type undefined
* @cat Plugins/jCarousel
*/
lock: function() {
this.locked = true;
this.buttons();
},
/**
* Unlocks the carousel.
*
* @name unlock
* @type undefined
* @cat Plugins/jCarousel
*/
unlock: function() {
this.locked = false;
this.buttons();
},
/**
* Sets the size of the carousel.
*
* @name size
* @type undefined
* @param Number s The size of the carousel.
* @cat Plugins/jCarousel
*/
size: function(s) {
if (s != undefined) {
this.options.size = s;
if (!this.locked)
this.buttons();
}
return this.options.size;
},
/**
* Checks whether a list element exists for the given index
(or index range).
*
* @name get
* @type bool
* @param Number i The index of the (first) element.
* @param Number i2 The index of the last element.
* @cat Plugins/jCarousel
*/
has: function(i, i2) {
if (i2 == undefined || !i2)
i2 = i;
for (var j = i; j <= i2; j++) {
var e = this.get(j).get(0);
if (!e || $.className.has(e, 'jcarousel-item-
placeholder'))
return false;
}
return true;
},
/**
* Returns a jQuery object with list element for the given
index.
*
* @name get
* @type jQuery
* @param Number i The index of the element.
* @cat Plugins/jCarousel
*/
get: function(i) {
return $('.jcarousel-item-' + i, this.list);
},
/**
* Adds an element for the given index to the list.
* If the element already exists, it updates the inner html.
* Returns the created element as jQuery object.
*
* @name add
* @type jQuery
* @param Number i The index of the element.
* @param String s The innerHTML of the element.
* @cat Plugins/jCarousel
*/
add: function(i, s) {
var e = this.get(i), old = 0;
if (e.length == 0) {
var c, e = this.create(i), j = $jc.intval(i);
while (c = this.get(--j)) {
if (j <= 0 || c.length) {
j <= 0 ? this.list.prepend(e) : c.after(e);
break;
}
}
} else
old = this.dimension(e);
e.removeClass(this.className('jcarousel-item-
placeholder'));
typeof s == 'string' ? e.html(s) : e.empty().append(s);
var di = this.options.visible != null ?
Math.ceil(this.clipping() / this.options.visible) : null;
var wh = this.dimension(e, di) - old;
if (i > 0 && i < this.first)
this.list.css(this.lt,
$jc.intval(this.list.css(this.lt)) + wh + 'px');
this.list.css(this.wh, $jc.intval(this.list.css(this.wh))
+ wh + 'px');
return e;
},
/**
* Removes an element for the given index from the list.
*
* @name remove
* @type undefined
* @param Number i The index of the element.
* @cat Plugins/jCarousel
*/
remove: function(i) {
var e = this.get(i);
// Check if item exists and is not currently visible
if (!e.length || (i >= this.first && i <= this.last))
return;
var d = this.dimension(e);
if (i < this.first)
this.list.css(this.lt,
$jc.intval(this.list.css(this.lt)) + d + 'px');
e.remove();
this.list.css(this.wh, $jc.intval(this.list.css(this.wh))
- d + 'px');
},
/**
* Moves the carousel forwards.
*
* @name next
* @type undefined
* @cat Plugins/jCarousel
*/
next: function() {
this.stopAuto();
if (this.tail != null && !this.inTail)
this.scrollTail(false);
this.currPage = this.currPage + 1;
else
this.scroll(((this.options.wrap == 'both' ||
this.options.wrap == 'last') && this.options.size != null && this.last
== this.options.size) ? 1 : this.first + this.options.scroll);
this.currPage = this.currPage + 1;
},
/**
* Moves the carousel backwards.
*
* @name prev
* @type undefined
* @cat Plugins/jCarousel
*/
prev: function() {
this.stopAuto();
if (this.tail != null && this.inTail)
this.scrollTail(true);
this.currPage = this.currPage - 1;
else
this.scroll(((this.options.wrap == 'both' ||
this.options.wrap == 'first') && this.options.size != null &&
this.first == 1) ? this.options.size : this.first -
this.options.scroll);
this.currPage = this.currPage - 1;
},
/**
* Scrolls the tail of the carousel.
*
* @name scrollTail
* @type undefined
* @param Bool b Whether scroll the tail back or forward.
* @cat Plugins/jCarousel
*/
scrollTail: function(b) {
if (this.locked || this.animating || !this.tail)
return;
var pos = $jc.intval(this.list.css(this.lt));
!b ? pos -= this.tail : pos += this.tail;
this.inTail = !b;
// Save for callbacks
this.prevFirst = this.first;
this.prevLast = this.last;
this.animate(pos);
},
/**
* Scrolls the carousel to a certain position.
*
* @name scroll
* @type undefined
* @param Number i The index of the element to scoll to.
* @param Bool a Flag indicating whether to perform animation.
* @cat Plugins/jCarousel
*/
scroll: function(i, a) {
if (this.locked || this.animating)
return;
this.animate(this.pos(i), a);
},
/**
* Prepares the carousel and return the position for a certian
index.
*
* @name pos
* @type Number
* @param Number i The index of the element to scoll to.
* @cat Plugins/jCarousel
*/
pos: function(i) {
if (this.locked || this.animating)
return;
if (this.options.wrap != 'circular')
i = i < 1 ? 1 : (this.options.size && i >
this.options.size ? this.options.size : i);
var back = this.first > i;
var pos = $jc.intval(this.list.css(this.lt));
// Create placeholders, new list width/height
// and new list position
var f = this.options.wrap != 'circular' && this.first <=
1 ? 1 : this.first;
var c = back ? this.get(f) : this.get(this.last);
var j = back ? f : f - 1;
var e = null, l = 0, p = false, d = 0;
while (back ? --j >= i : ++j < i) {
e = this.get(j);
p = !e.length;
if (e.length == 0) {
e =
this.create(j).addClass(this.className('jcarousel-item-placeholder'));
c[back ? 'before' : 'after' ](e);
}
c = e;
d = this.dimension(e);
if (p)
l += d;
if (this.first != null && (this.options.wrap ==
'circular' || (j >= 1 && (this.options.size == null || j <=
this.options.size))))
pos = back ? pos + d : pos - d;
}
// Calculate visible items
var clipping = this.clipping();
var cache = [];
var visible = 0, j = i, v = 0;
var c = this.get(i - 1);
while (++visible) {
e = this.get(j);
p = !e.length;
if (e.length == 0) {
e =
this.create(j).addClass(this.className('jcarousel-item-placeholder'));
// This should only happen on a next scroll
c.length == 0 ? this.list.prepend(e) : c[back ?
'before' : 'after' ](e);
}
c = e;
var d = this.dimension(e);
if (d == 0) {
alert('jCarousel: No width/height set for items.
This will cause an infinite loop. Aborting...');
return 0;
}
if (this.options.wrap != 'circular' &&
this.options.size !== null && j > this.options.size)
cache.push(e);
else if (p)
l += d;
v += d;
if (v >= clipping)
break;
j++;
}
// Remove out-of-range placeholders
for (var x = 0; x < cache.length; x++)
cache[x].remove();
// Resize list
if (l > 0) {
this.list.css(this.wh, this.dimension(this.list) + l +
'px');
if (back) {
pos -= l;
this.list.css(this.lt,
$jc.intval(this.list.css(this.lt)) - l + 'px');
}
}
// Calculate first and last item
var last = i + visible - 1;
if (this.options.wrap != 'circular' && this.options.size
&& last > this.options.size)
last = this.options.size;
if (j > last) {
visible = 0, j = last, v = 0;
while (++visible) {
v += this.dimension(this.get(j--));
if (v >= clipping)
break;
}
}
var first = last - visible + 1;
if (this.options.wrap != 'circular' && first < 1)
first = 1;
if (this.inTail && back) {
pos += this.tail;
this.inTail = false;
}
this.tail = null;
if (this.options.wrap != 'circular' && last ==
this.options.size && (last - visible + 1) >= 1) {
var m = $jc.margin(this.get(last), !
this.options.vertical ? 'marginRight' : 'marginBottom');
if ((v - m) > clipping)
this.tail = v - clipping - m;
}
// Adjust position
while (i-- > first)
pos += this.dimension(this.get(i));
// Save visible item range
this.prevFirst = this.first;
this.prevLast = this.last;
this.first = first;
this.last = last;
return pos;
},
/**
* Animates the carousel to a certain position.
*
* @name animate
* @type undefined
* @param mixed p Position to scroll to.
* @param Bool a Flag indicating whether to perform animation.
* @cat Plugins/jCarousel
*/
animate: function(p, a) {
if (this.locked || this.animating)
return;
this.animating = true;
var self = this;
var scrolled = function() {
self.animating = false;
if (p == 0)
self.list.css(self.lt, 0);
if (self.options.wrap == 'both' || self.options.wrap
== 'last' || self.options.size == null || self.last <
self.options.size)
self.startAuto();
self.buttons();
self.notify('onAfterAnimation');
};
this.notify('onBeforeAnimation');
// Animate
if (!this.options.animation || a == false) {
this.list.css(this.lt, p + 'px');
scrolled();
} else {
var o = !this.options.vertical ? {'left': p} : {'top':
p};
this.list.animate(o, this.options.animation,
this.options.easing, scrolled);
}
},
/**
* Starts autoscrolling.
*
* @name auto
* @type undefined
* @param Number s Seconds to periodically autoscroll the
content.
* @cat Plugins/jCarousel
*/
startAuto: function(s) {
if (s != undefined)
this.options.auto = s;
if (this.options.auto == 0)
return this.stopAuto();
if (this.timer != null)
return;
var self = this;
this.timer = setTimeout(function() { self.next(); },
this.options.auto * 1000);
},
/**
* Stops autoscrolling.
*
* @name stopAuto
* @type undefined
* @cat Plugins/jCarousel
*/
stopAuto: function() {
if (this.timer == null)
return;
clearTimeout(this.timer);
this.timer = null;
},
/**
* Sets the states of the prev/next buttons.
*
* @name buttons
* @type undefined
* @cat Plugins/jCarousel
*/
buttons: function(n, p) {
if (n == undefined || n == null) {
var n = !this.locked && this.options.size !== 0 &&
((this.options.wrap && this.options.wrap != 'first') ||
this.options.size == null || this.last < this.options.size);
if (!this.locked && (!this.options.wrap ||
this.options.wrap == 'first') && this.options.size != null &&
this.last >= this.options.size)
n = this.tail != null && !this.inTail;
}
if (p == undefined || p == null) {
var p = !this.locked && this.options.size !== 0 &&
((this.options.wrap && this.options.wrap != 'last') || this.first >
1);
if (!this.locked && (!this.options.wrap ||
this.options.wrap == 'last') && this.options.size != null &&
this.first == 1)
p = this.tail != null && this.inTail;
}
var self = this;
this.buttonNext[n ? 'bind' : 'unbind']
(this.options.buttonNextEvent, this.funcNext)[n ? 'removeClass' :
'addClass'](this.className('jcarousel-next-
disabled')).attr('disabled', n ? false : true);
this.buttonPrev[p ? 'bind' : 'unbind']
(this.options.buttonPrevEvent, this.funcPrev)[p ? 'removeClass' :
'addClass'](this.className('jcarousel-prev-
disabled')).attr('disabled', p ? false : true);
if (this.buttonNext.length > 0 &&
(this.buttonNext[0].jcarouselstate == undefined ||
this.buttonNext[0].jcarouselstate != n) &&
this.options.buttonNextCallback != null) {
this.buttonNext.each(function()
{ self.options.buttonNextCallback(self, this, n); });
this.buttonNext[0].jcarouselstate = n;
}
if (this.buttonPrev.length > 0 &&
(this.buttonPrev[0].jcarouselstate == undefined ||
this.buttonPrev[0].jcarouselstate != p) &&
this.options.buttonPrevCallback != null) {
this.buttonPrev.each(function()
{ self.options.buttonPrevCallback(self, this, p); });
this.buttonPrev[0].jcarouselstate = p;
}
},
notify: function(evt) {
var state = this.prevFirst == null ? 'init' :
(this.prevFirst < this.first ? 'next' : 'prev');
// Load items
this.callback('itemLoadCallback', evt, state);
if (this.prevFirst != this.first) {
this.callback('itemFirstInCallback', evt, state,
this.first);
this.callback('itemFirstOutCallback', evt, state,
this.prevFirst);
}
if (this.prevLast != this.last) {
this.callback('itemLastInCallback', evt, state,
this.last);
this.callback('itemLastOutCallback', evt, state,
this.prevLast);
}
this.callback('itemVisibleInCallback', evt, state,
this.first, this.last, this.prevFirst, this.prevLast);
this.callback('itemVisibleOutCallback', evt, state,
this.prevFirst, this.prevLast, this.first, this.last);
},
callback: function(cb, evt, state, i1, i2, i3, i4) {
if (this.options[cb] == undefined || (typeof
this.options[cb] != 'object' && evt != 'onAfterAnimation'))
return;
var callback = typeof this.options[cb] == 'object' ?
this.options[cb][evt] : this.options[cb];
if (!$.isFunction(callback))
return;
var self = this;
if (i1 === undefined)
callback(self, state, evt);
else if (i2 === undefined)
this.get(i1).each(function() { callback(self, this,
i1, state, evt); });
else {
for (var i = i1; i <= i2; i++)
if (!(i >= i3 && i <= i4))
this.get(i).each(function() { callback(self,
this, i, state, evt); });
}
},
create: function(i) {
return this.format('<li></li>', i);
},
format: function(e, i) {
var $e = $(e).addClass(this.className('jcarousel-
item')).addClass(this.className('jcarousel-item-' + i));
$e.attr('jcarouselindex', i);
return $e;
},
className: function(c) {
return c + ' ' + c + (!this.options.vertical ? '-
horizontal' : '-vertical');
},
dimension: function(e, d) {
var el = e.jquery != undefined ? e[0] : e;
var old = !this.options.vertical ?
el.offsetWidth + $jc.margin(el, 'marginLeft') +
$jc.margin(el, 'marginRight') :
el.offsetHeight + $jc.margin(el, 'marginTop') +
$jc.margin(el, 'marginBottom');
if (d == undefined || old == d)
return old;
var w = !this.options.vertical ?
d - $jc.margin(el, 'marginLeft') - $jc.margin(el,
'marginRight') :
d - $jc.margin(el, 'marginTop') - $jc.margin(el,
'marginBottom');
$(el).css(this.wh, w + 'px');
return this.dimension(el);
},
clipping: function() {
return !this.options.vertical ?
this.clip[0].offsetWidth -
$jc.intval(this.clip.css('borderLeftWidth')) -
$jc.intval(this.clip.css('borderRightWidth')) :
this.clip[0].offsetHeight -
$jc.intval(this.clip.css('borderTopWidth')) -
$jc.intval(this.clip.css('borderBottomWidth'));
},
index: function(i, s) {
if (s == undefined)
s = this.options.size;
return Math.round((((i-1) / s) - Math.floor((i-1) / s)) *
s) + 1;
}
});
$jc.extend({
/**
* Sets the global default configuration properties.
*
* @name defaults
* @descr Sets the global default configuration properties.
* @type undefined
* @param Hash d A set of key/value pairs to set as
configuration properties.
* @cat Plugins/jCarousel
*/
defaults: function(d) {
$.extend(defaults, d);
},
margin: function(e, p) {
if (!e)
return 0;
var el = e.jquery != undefined ? e[0] : e;
if (p == 'marginRight' && $.browser.safari) {
var old = {'display': 'block', 'float': 'none',
'width': 'auto'}, oWidth, oWidth2;
$.swap(el, old, function() { oWidth =
el.offsetWidth; });
old['marginRight'] = 0;
$.swap(el, old, function() { oWidth2 =
el.offsetWidth; });
return oWidth2 - oWidth;
}
return $jc.intval($.css(el, p));
},
intval: function(v) {
v = parseInt(v);
return isNaN(v) ? 0 : v;
}
});
})(jQuery);
If you can give me some help,
With thanks.
