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marquee
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158 lines (153 loc) · 7.53 KB
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//跑马灯
(function (jQuery) {
jQuery.fn.extend({
/**
*@description 无缝滚动 支持匀速上下左右和垂直翻滚上下
*@param {
* direction:string,//滚动方向 值域：top|left|bottom|right|up|down
* speed:string//滚动速度（垂直翻滚时为停留时间）
* } o
*@example
*HTML结构
*<div id="mar">
* <ul>
* <li>内容1</li>
* <li>内容2</li>
* <li>内容3</li>
* </ul>
*</div>
*mar样式应该包含height,width,background等 注意不要覆盖了插件附加上去的样式
*调用：
*jQuery("#mar").marquee({
* direction:"top",
* speed:30
*})
*
*/
marquee:function (o) {
var it = this,
d = o.direction || 'left', //滚动方向 默认向左
s = o.speed || 30, //速度 默认30毫秒
mar = jQuery(it),
mp1 = jQuery(it).children(0).attr({id:"mp1"}),
marqueeF = getMarquee(d),
marRun = marqueeF ? setInterval(marqueeF, s) : function () {
return false;
};//开始滚动
//鼠标悬停事件
jQuery(it).hover(function () {
clearInterval(marRun);
}, function () {
marRun = setInterval(marqueeF, s);
})
/*生成滚动函数
*1.判断方向 *2.装载CSS *3.判断需不需要滚动 *4.构造函数
*/
function getMarquee(d) {
var marqueeFunc;
switch (d) {
//水平向左
case "left":
mar.addClass("plus-mar-left");
var liHeight = mar[0].offsetHeight;
mar.css({"line-height":liHeight + "px"});
if (mp1[0].offsetWidth < mar[0].offsetWidth) return false;
mp1.clone().attr({id:"mp2"}).appendTo(mar);
marqueeFunc = function () {
if (mar[0].scrollLeft >= mp1[0].scrollWidth) {
mar[0].scrollLeft = 0;
} else {
mar[0].scrollLeft++;
}
}
break;
//水平向上
case "top":
mar.addClass("plus-mar-top");
if (mp1.outerHeight() <= mar.outerHeight()) return false;
var mp2 = mp1.clone().attr({id:"mp2"}).appendTo(mar);
marqueeFunc = function () {
var scrollTop = mar[0].scrollTop;
if (mp1[0].offsetHeight > scrollTop) {
mar[0].scrollTop = scrollTop + 1;
} else {
mar[0].scrollTop = 0;
}
}
break;
//水平向右
case "right":
mar.addClass("plus-mar-left");
var liHeight = mar[0].offsetHeight;
mar.css({"line-height":liHeight + "px"});
if (mp1[0].offsetWidth <= mar[0].offsetWidth) return false;
var mp2 = mp1.clone().attr({id:"mp2"}).appendTo(mar);
marqueeFunc = function () {
if (mar[0].scrollLeft <= 0) {
mar[0].scrollLeft += mp2[0].offsetWidth;
} else {
mar[0].scrollLeft--;
}
}
break;
//水平向下
case "bottom":
mar.addClass("plus-mar-bottom");
if (mp1[0].offsetHeight <= mar[0].offsetHeight) return false;
var mp2 = mp1.clone().attr({id:"mp2"}).appendTo(mar);
mar[0].scrollTop = mar[0].scrollHeight;
marqueeFunc = function () {
if (mp1[0].offsetTop >= mar[0].scrollTop) {
mar[0].scrollTop += mp1[0].offsetHeight;
} else {
mar[0].scrollTop--;
}
}
break;
//垂直翻滚 向上
case "up":
mar.addClass("plus-mar-up");
var liHeight = mar[0].offsetHeight;
mp1.css({"line-height":liHeight + "px"});
marqueeFunc = function () {
var currLi = it.eq(0).find("ul:first");
currLi.animate({
marginTop:-liHeight
}, 500, function () {
currLi.find("li:first").appendTo(currLi);
currLi.css({marginTop:0});
})
}
break;
//垂直翻滚 向下
case "down":
mar.addClass("plus-mar-down");
var liHeight = mar[0].offsetHeight,
liLength = mp1.children().length,
topInit = -(liLength - 1) * liHeight + "px";
mp1.css({"top":topInit, "line-height":liHeight + "px"});
marqueeFunc = function () {
var currLi = it.eq(0).find("ul:last");
currLi.animate({
marginTop:liHeight
}, 500, function () {
currLi.find("li:last").prependTo(currLi);
currLi.css({marginTop:0});
})
}
break;
default:
{
marqueeFunc = null;
alert("滚动插件：传入的参数{direction}有误！");
}
}
return marqueeFunc;
}
}
})
})(jQuery);
$("#mar1").marquee({
direction:"top",
speed:30
});