图片滚动插件(jCarouselLite),通过margin来调整图片间隔

/** * jCarouselLite - jQuery plugin to navigate images/any content in a carousel style widget. * @requires jQuery v1.2 or above * * http://gmarwaha.com/jquery/jcarousellite/ * * Copyright (c) 2007 Ganeshji Marwaha (gmarwaha.com) * Dual licensed under the MIT and GPL licenses: * http://www.opensource.org/licenses/mit-license.php * http://www.gnu.org/licenses/gpl.html * * Version: 1.0.1 * Note: Requires jquery 1.2 or above from version 1.0.1 */ /** btnPrev : 上一张按钮 btnNext : 下一张按钮 btnGo : 标签控制,也就是用’1,2,3,4…’来控制 mouseWheel : 是否支持鼠标滑轮滚动,属性值:false / true;默认为false 打开此项需要jQuery UI插件支持 auto : 设置自动播放的速度,默认自动播放是关闭的,格式 auto: 800 (为播放速度) speed : 动画效果速度 easing : 动画效果优化,姑且这么里面 需要外部插件支持 vertical : 动画方向,如果设置为true,则表示垂直滚动,默认为false circular : 是否重复播放,如果设置为false,则到最后一个下一张按钮就点不动了,到第一张上一张按钮就点不动 visible : 设置默认显示几个li,默认是3个 start : 效果从第几个开始,默认为0 scroll : 一次滑动几个li,默认是2 beforeStart : 这个是接口,每次滑动效果执行之前执行的自定义函数 afterEnd : 这个是接口,每次滑动效果执行之后执行的自定义函数 */ /** * Creates a carousel-style navigation widget for images/any-content from a simple HTML markup. * * The HTML markup that is used to build the carousel can be as simple as... * * <div class="carousel"> * <ul> * <li><img src="image/1.jpg" alt="1"></li> * <li><img src="image/2.jpg" alt="2"></li> * <li><img src="image/3.jpg" alt="3"></li> * </ul> * </div> * * As you can see, this snippet is nothing but a simple div containing an unordered list of images. * You don't need any special "class" attribute, or a special "css" file for this plugin. * I am using a class attribute just for the sake of explanation here. * * To navigate the elements of the carousel, you need some kind of navigation buttons. * For example, you will need a "previous" button to go backward, and a "next" button to go forward. * This need not be part of the carousel "div" itself. It can be any element in your page. * Lets assume that the following elements in your document can be used as next, and prev buttons... * * <button class="prev">&lt;&lt;</button> * <button class="next">&gt;&gt;</button> * * Now, all you need to do is call the carousel component on the div element that represents it, and pass in the * navigation buttons as options. * * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev" * }); * * That's it, you would have now converted your raw div, into a magnificient carousel. * * There are quite a few other options that you can use to customize it though. * Each will be explained with an example below. * * @param an options object - You can specify all the options shown below as an options object param. * * @option btnPrev, btnNext : string - no defaults * @example * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev" * }); * @desc Creates a basic carousel. Clicking "btnPrev" navigates backwards and "btnNext" navigates forward. * * @option btnGo - array - no defaults * @example * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev", * btnGo: [".0", ".1", ".2"] * }); * @desc If you don't want next and previous buttons for navigation, instead you prefer custom navigation based on * the item number within the carousel, you can use this option. Just supply an array of selectors for each element * in the carousel. The index of the array represents the index of the element. What i mean is, if the * first element in the array is ".0", it means that when the element represented by ".0" is clicked, the carousel * will slide to the first element and so on and so forth. This feature is very powerful. For example, i made a tabbed * interface out of it by making my navigation elements styled like tabs in css. As the carousel is capable of holding * any content, not just images, you can have a very simple tabbed navigation in minutes without using any other plugin. * The best part is that, the tab will "slide" based on the provided effect. :-) * * @option mouseWheel : boolean - default is false * @example * $(".carousel").jCarouselLite({ * mouseWheel: true * }); * @desc The carousel can also be navigated using the mouse wheel interface of a scroll mouse instead of using buttons. * To get this feature working, you have to do 2 things. First, you have to include the mouse-wheel plugin from brandon. * Second, you will have to set the option "mouseWheel" to true. That's it, now you will be able to navigate your carousel * using the mouse wheel. Using buttons and mouseWheel or not mutually exclusive. You can still have buttons for navigation * as well. They complement each other. To use both together, just supply the options required for both as shown below. * @example * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev", * mouseWheel: true * }); * * @option auto : number - default is null, meaning autoscroll is disabled by default * @example * $(".carousel").jCarouselLite({ * auto: 800, * speed: 500 * }); * @desc You can make your carousel auto-navigate itself by specfying a millisecond value in this option. * The value you specify is the amount of time between 2 slides. The default is null, and that disables auto scrolling. * Specify this value and magically your carousel will start auto scrolling. * * @option speed : number - 200 is default * @example * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev", * speed: 800 * }); * @desc Specifying a speed will slow-down or speed-up the sliding speed of your carousel. Try it out with * different speeds like 800, 600, 1500 etc. Providing 0, will remove the slide effect. * * @option easing : string - no easing effects by default. * @example * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev", * easing: "bounceout" * }); * @desc You can specify any easing effect. Note: You need easing plugin for that. Once specified, * the carousel will slide based on the provided easing effect. * * @option vertical : boolean - default is false * @example * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev", * vertical: true * }); * @desc Determines the direction of the carousel. true, means the carousel will display vertically. The next and * prev buttons will slide the items vertically as well. The default is false, which means that the carousel will * display horizontally. The next and prev items will slide the items from left-right in this case. * * @option circular : boolean - default is true * @example * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev", * circular: false * }); * @desc Setting it to true enables circular navigation. This means, if you click "next" after you reach the last * element, you will automatically slide to the first element and vice versa. If you set circular to false, then * if you click on the "next" button after you reach the last element, you will stay in the last element itself * and similarly for "previous" button and first element. * * @option visible : number - default is 3 * @example * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev", * visible: 4 * }); * @desc This specifies the number of items visible at all times within the carousel. The default is 3. * You are even free to experiment with real numbers. Eg: "3.5" will have 3 items fully visible and the * last item half visible. This gives you the effect of showing the user that there are more images to the right. * * @option start : number - default is 0 * @example * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev", * start: 2 * }); * @desc You can specify from which item the carousel should start. Remember, the first item in the carousel * has a start of 0, and so on. * * @option scrool : number - default is 1 * @example * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev", * scroll: 2 * }); * @desc The number of items that should scroll/slide when you click the next/prev navigation buttons. By * default, only one item is scrolled, but you may set it to any number. Eg: setting it to "2" will scroll * 2 items when you click the next or previous buttons. * * @option beforeStart, afterEnd : function - callbacks * @example * $(".carousel").jCarouselLite({ * btnNext: ".next", * btnPrev: ".prev", * beforeStart: function(a) { * alert("Before animation starts:" + a); * }, * afterEnd: function(a) { * alert("After animation ends:" + a); * } * }); * @desc If you wanted to do some logic in your page before the slide starts and after the slide ends, you can * register these 2 callbacks. The functions will be passed an argument that represents an array of elements that * are visible at the time of callback. * * * @cat Plugins/Image Gallery * @author Ganeshji Marwaha/ganeshread@gmail.com */ (function($) { // Compliant with jquery.noConflict() $.fn.jCarouselLite = function(o) { o = $.extend({ btnPrev: null, btnNext: null, btnGo: null, mouseWheel: false, auto: null, speed: 200, easing: null, vertical: false, circular: true, visible: 3, start: 0, scroll: 1, beforeStart: null, afterEnd: null }, o || {}); return this.each(function() { // Returns the element collection. Chainable. var running = false, animCss=o.vertical?"top":"left", sizeCss=o.vertical?"height":"width"; var div = $(this), ul = $("ul", div), tLi = $("li", ul), tl = tLi.size(), v = o.visible; if(o.circular) { ul.prepend(tLi.slice(tl-v-1+1).clone()) .append(tLi.slice(0,v).clone()); o.start += v; } var li = $("li", ul), itemLength = li.size(), curr = o.start; div.css("visibility", "visible"); li.css({overflow: "hidden", float: o.vertical ? "none" : "left"}); ul.css({margin: "0", padding: "0", position: "relative", "list-style-type": "none", "z-index": "1"}); div.css({overflow: "hidden", position: "relative", "z-index": "2", left: "0px"}); var liSize = o.vertical ? height(li) : width(li); // Full li size(incl margin)-Used for animation var ulSize = liSize * itemLength; // size of full ul(total length, not just for the visible items) var divSize = liSize * v; // size of entire div(total length for just the visible items) li.css({width: li.width(), height: li.height()}); ul.css(sizeCss, ulSize+"px").css(animCss, -(curr*liSize)); div.css(sizeCss, divSize+"px"); // Width of the DIV. length of visible images if(o.btnPrev) $(o.btnPrev).click(function() { return go(curr-o.scroll); }); if(o.btnNext) $(o.btnNext).click(function() { return go(curr+o.scroll); }); if(o.btnGo) $.each(o.btnGo, function(i, val) { $(val).click(function() { return go(o.circular ? o.visible+i : i); }); }); if(o.mouseWheel && div.mousewheel) div.mousewheel(function(e, d) { return d>0 ? go(curr-o.scroll) : go(curr+o.scroll); }); if(o.auto) setInterval(function() { go(curr+o.scroll); }, o.auto+o.speed); function vis() { return li.slice(curr).slice(0,v); }; function go(to) { if(!running) { if(o.beforeStart) o.beforeStart.call(this, vis()); if(o.circular) { // If circular we are in first or last, then goto the other end if(to<=o.start-v-1) { // If first, then goto last ul.css(animCss, -((itemLength-(v*2))*liSize)+"px"); // If "scroll" > 1, then the "to" might not be equal to the condition; it can be lesser depending on the number of elements. curr = to==o.start-v-1 ? itemLength-(v*2)-1 : itemLength-(v*2)-o.scroll; } else if(to>=itemLength-v+1) { // If last, then goto first ul.css(animCss, -( (v) * liSize ) + "px" ); // If "scroll" > 1, then the "to" might not be equal to the condition; it can be greater depending on the number of elements. curr = to==itemLength-v+1 ? v+1 : v+o.scroll; } else curr = to; } else { // If non-circular and to points to first or last, we just return. if(to<0 || to>itemLength-v) return; else curr = to; } // If neither overrides it, the curr will still be "to" and we can proceed. running = true; ul.animate( animCss == "left" ? { left: -(curr*liSize) } : { top: -(curr*liSize) } , o.speed, o.easing, function() { if(o.afterEnd) o.afterEnd.call(this, vis()); running = false; } ); // Disable buttons when the carousel reaches the last/first, and enable when not if(!o.circular) { $(o.btnPrev + "," + o.btnNext).removeClass("disabled"); $( (curr-o.scroll<0 && o.btnPrev) || (curr+o.scroll > itemLength-v && o.btnNext) || [] ).addClass("disabled"); } } return false; }; }); }; function css(el, prop) { return parseInt($.css(el[0], prop)) || 0; }; function width(el) { return el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight'); }; function height(el) { return el[0].offsetHeight + css(el, 'marginTop') + css(el, 'marginBottom'); }; })(jQuery);