Focus image switching with thumbnails implemented by jquery (automatic play/response to mouse actions)_jquery

/**
* 手动滚动图片
*
**/
$.extend({
manualScroll:function(opt,callback){
//alert("suc");
this.defaults = {
objId:"", // 滚动区域id
showArea:"", // 大图显示区域id，如果没有就不显示
showWidth:700, // 大图宽度
showHeight:525, // 大图高度
showTitle: false, // 是否在大图下方显示标题
width:300, // 每行的宽度
height:100, // div的高度
line:2, // 每次滚动的行数
autoLine:1, // 自动滚动的行数
speed:0, // 动作时间
interval:3000, // 滚动间隔
imgPath:"", // 图片根目录
directBtn:"img/direct_btn02.png", // 指向图片
picTimer:0, // 间隔句柄，不需要设置，只是作为标识使用
opacity:0.3 // 按钮透明度
};

//参数初始化
var opts = $.extend(this.defaults,opt);

// 定义外层元素样式
$("#"+opts.objId).css({
"position":"relative",
"overflow":"hidden",
"width":(opts.line * opts.width) + "px"
});
// 定义ul样式
$("#"+opts.objId + " ul").css({
"width":opts.width * $("#"+opts.objId + " ul").find("li").size() + "px",
"height":opts.height + "px"
});

// 定义li样式
$("#"+opts.objId + " ul li").css({
"display":"block",
"float":"left",
"width":opts.width + "px",
"height":opts.height + "px"
});

// 添加向左滚动按钮
$("#"+opts.objId).append("");

// 定义向左按钮的位置
$("#button_left").css({
"width":"40px",
"height":"40px",
"background":"url(" + opts.imgPath + opts.directBtn + ")",
"background-position":"0px 0px",
"position":"absolute",
"left":"0px",
"top":(opts.height/2 - 20) + "px"
});

// 添加向右滚动按钮
$("#"+opts.objId).append("");

// 定义向右按钮的位置
$("#button_right").css({
"width":"40px",
"height":"40px",
"background":"url(" + opts.imgPath + opts.directBtn + ")",
"background-position":"-40px 0px",
"position":"absolute",
"left":(opts.line * opts.width - 40) + "px",
"top":(opts.height/2 - 20) + "px"
});

// 向左按钮添加动作
$("#button_left").click(function(){
var scrollWidth = 0 - opts.line * opts.width - (0 - $("#"+opts.objId).find("ul:first").css("margin-left").replace("px",""));
// 无间断滚动
$("#"+opts.objId).find("ul:first").animate({
marginLeft:scrollWidth
},opts.speed,function(){
for(i=1;i<=opts.line;i++){
$("#"+opts.objId).find("li:first").appendTo($("#"+opts.objId).find("ul:first"));
}
$("#"+opts.objId).find("ul:first").css({marginLeft:0});
showArea();
});
});

// 向右按钮添加动作
$("#button_right").click(function(){
var scrollWidth = (0 - opts.line*opts.width + (0 - $("#"+opts.objId).find("ul:first").css("margin-left").replace("px","")));
// 无间断滚动
$("#"+opts.objId).find("ul:first").animate({
marginLeft:scrollWidth
},0,function(){
for(i=1;i<=opts.line;i++){
$("#"+opts.objId).find("li:last").prependTo($("#"+opts.objId).find("ul:first"));
}
$("#"+opts.objId).find("ul:first").animate({
marginLeft:0
},opts.speed,function(){
$("#"+opts.objId).find("ul:first").css({marginLeft:0});
showArea();
});
});
});

/**
* 自动横向滚动
*/
function scrollLeft(){
var scrollWidth = 0 - opts.autoLine * opts.width - (0 - $("#"+opts.objId).find("ul:first").css("margin-left").replace("px",""));
$("#"+opts.objId).find("ul:first").animate({
marginLeft:scrollWidth
},opts.speed,function(){
for(i=1;i<=opts.autoLine;i++){
$("#"+opts.objId).find("li:first").appendTo($("#"+opts.objId).find("ul:first"));
}
$("#"+opts.objId).find("ul:first").css({marginLeft:0});
showArea();
});
};

/**
* 大图下方显示标题
*/
if(opts.showTitle && $("#"+opts.showArea).size() > 0){
$("#"+opts.showArea).css({
"width":opts.showWidth + "px",
"position":"relative",
"height":opts.showHeight + "px"
});
$("#"+opts.showArea).html("");
$("#"+opts.showArea).append("");
$("#manualScroll_banner").css({
"width":opts.showWidth "px",
"height":"20px",
"background": "#333",
"position":"absolute",
opacity:0.7,
"text-align":"center",
"color":"#FFF",
"left":"0px",
"top":(opts.showHeight - 20) "px"
});
}

/**
* Display large image in designated area
*/
function showArea(){
if($("#" opts.showArea).size() > 0){
// Display the position of the main image
var index = Math.floor ((opts.line - 1) / 2);
showIndexArea(index);
// Click the mouse to display the large image
$("#" opts.objId " ul li").each (function(index){
$(this).mouseover(function(){
showIndexArea(index);
});
});
}
}

/**
* Display a large image of the specified element
*/
function showIndexArea(index){
var imgSrc = $("#" opts.objId " ul li:eq(" index ") img:first") .attr("src");
var imgAlt = $("#" opts.objId " ul li:eq(" index ") img:first").attr("alt");
// Fade the remaining images
$("#" opts.objId " ul li:lt(" index ")").css({
opacity:0.5
});
$("# " opts.objId " ul li:gt(" index ")").css({
opacity:0.5
});
$("#" opts.objId " ul li:eq(" index ")").css({
opacity:1
});
// Show large image
$("#" opts.showArea " img:first").attr(" src", imgSrc);
//Show title
if(opts.showTitle){
$("#manualScroll_banner").text(imgAlt);
}
}

/**
* Show the button after sliding the mouse over
*/
$("#" opts.objId).hover(function() {
$("#button_left").css({
opacity:1
});
$("#button_right").css({
opacity:1
});
},function() {
$("#button_left" ).css({
opacity:opts.opacity
});
$("#button_right").css({
opacity:opts.opacity
});
}).trigger("mouseleave");

/**
* The first function to be executed
* Stops automatic playback when the mouse slides over the focus image, and starts automatic playback when the mouse slides out
*/
// Initialize the large image
showArea();
$("#" opts.objId ).hover(function() {
clearInterval(opts.picTimer);
},function() {
opts.picTimer = setInterval(function() {
scrollLeft();
},opts.interval); // Autoplay interval, unit: milliseconds
}).trigger("mouseleave");
}
});