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jquery.scrollElement.js
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jquery.scrollElement.js
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/**
* jQuery Scroll Element
* Copyright (c) 2011 Kevin Doyle
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
**/
(function($){
var config = {
prev : ".scrollprev",
next : ".scrollnext",
container : ".scrollcontainer",
mode : "page",
pagesize : 3,
displayed : null,
disabledclass : "disabled",
};
var el, calc, scrollcontainer, scrolllist;
var methods = {
init : function(settings) {
if (settings) { $.extend(config, settings); }
return this.each(function(){
var objdata;
el = $(this);
scrollcontainer = el.find(config.container);
scrolllist = scrollcontainer.find("td");
if(config.displayed === null){
config.displayed = config.pagesize;
}
el.data("scroll", {
prevbutton : el.find(config.prev),
nextbutton : el.find(config.next),
container : scrollcontainer,
currentelement : 0,
elementlist : scrolllist,
elementcontainer : scrollcontainer.find("tr"),
limit : scrolllist.length - 1,
elementpositions : [],
pages : 0,
pageindex : 0,
pagesize : config.pagesize,
displayed : config.displayed,
disabledclass : config.disabledclass
});
objdata = el.data("scroll");
objdata.container.scrollLeft(0);
objdata.container.css({"overflow":"hidden"});
objdata.prevbutton.addClass(objdata.disabledclass);
methods._calcPosition(false, el);
switch(config.mode){
case "page":
methods._calcPages(el);
if(objdata.pages <= 1){
objdata.nextbutton.addClass(objdata.disabledclass);
}
objdata.prevbutton.bind("click", {dir : "prev", scope : el}, methods._pageScroll);
objdata.nextbutton.bind("click", {dir : "next", scope : el}, methods._pageScroll);
break;
case "infinite":
objdata.prevbutton.removeClass(objdata.disabledclass);
objdata.prevbutton.bind("click", {dir : "prev", scope : el}, methods._infiniteScroll);
objdata.nextbutton.bind("click", {dir : "next", scope : el}, methods._infiniteScroll);
break;
}
});
},
_pageScroll : function(event){
var obj = event.data.scope,
objdata = obj.data("scroll");
if(event.data.dir === "prev" && objdata.pageindex > 0){
objdata.pageindex -= 1;
if(objdata.nextbutton.hasClass(objdata.disabledclass)){
objdata.nextbutton.removeClass(objdata.disabledclass);
}
if(objdata.pageindex === 0){
objdata.prevbutton.addClass(objdata.disabledclass);
}
} else if(event.data.dir === "next" && objdata.pageindex < objdata.pages) {
objdata.pageindex += 1;
objdata.prevbutton.removeClass(objdata.disabledclass);
if(objdata.pageindex === objdata.pages){
objdata.nextbutton.addClass(objdata.disabledclass);
}
}
calc = objdata.elementpositions[objdata.pageindex * objdata.pagesize];
objdata.container.stop().animate({
scrollLeft : calc
}, "fast");
return false;
},
_infiniteScroll : function(event){
var obj = event.data.scope,
objdata = obj.data("scroll");
calc = objdata.elementpositions[1];
if(event.data.dir === "prev"){
objdata.elementlist.eq(-1).prependTo(objdata.elementcontainer);
objdata.container.scrollLeft(calc);
objdata.container.stop().animate({
scrollLeft : 0
}, "fast", function(){
methods._calcPosition(true, obj);
});
} else if(event.data.dir === "next") {
objdata.container.stop().animate({
scrollLeft : calc
}, "fast", function(){
objdata.elementlist.eq(0).appendTo(objdata.elementcontainer);
objdata.container.scrollLeft(0);
methods._calcPosition(true, obj);
});
}
return false;
},
_calcPages : function(scope){
var obj = scope,
objdata = obj.data("scroll");
objdata.pages = Math.max(1, Math.ceil((objdata.limit - (objdata.displayed - objdata.pagesize)) / objdata.pagesize));
objdata.pageindex = Math.max(0, objdata.pageindex);
objdata.pageindex = Math.min(objdata.pages, objdata.pageindex);
},
_calcPosition : function(recalc, scope){
var obj = scope,
objdata = obj.data("scroll");
if(recalc){
objdata.elementlist = objdata.container.find("td");
}
objdata.elementlist.each(function(i){
objdata.elementpositions[i] = Math.ceil($(this).position().left);
});
}
};
$.fn.scrollElement = function(method) {
if (methods[method]) {
return methods[method].apply(this, Array.prototype.slice.call( arguments, 1 ));
} else if (typeof method === 'object' || ! method) {
return methods.init.apply(this, arguments);
} else {
$.error('Method ' + method + ' does not exist on scrollElement');
}
};
})(jQuery);