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This example explains how to implement the image scrolling effect using JavaScript. Shared for reference, as follows:
html code:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<meta name="renderer" content="webkit"/>
<meta name="keywords" content=""/>
<meta name="description" content=""/>
<title>Image Scroll</title>
<style>
*{margin:0;padding:0;}
ul{list-style:none;}
img{border:0;}
.scroll{width:358px;height:63px;}
.scroll_left{width:23px;height:63px;background:url(images/btn_left.jpg) no-repeat;float:left;}
.scroll_right{width:23px;height:63px;background:url(images/btn_right.jpg) left no-repeat;float:left;}
.pic{width:312px;height:73px;float:left;}
.pic ul{display:block;}
.pic li{float:left;display:inline;width:104px;text-align:center;}
</style>
</head>
<body>
<div style="margin:100px auto;width:358px;">
<div class="scroll">
<div class="scroll_left" id="LeftArr"></div>
<div class="pic" id="scrollPic">
<ul>
<li><a href="#" target="_blank" title=""><img src="images/pic01.png" width="100" height="63" alt="" /></a></li>
<li><a href="#" target="_blank" title=""><img src="images/pic02.jpg" width="100" height="63" alt="" /></a></li>
<li><a href="#" target="_blank" title=""><img src="images/pic03.jpg" width="100" height="63" alt="" /></a></li>
<li><a href="#" target="_blank" title=""><img src="images/pic04.jpg" width="100" height="63" alt="" /></a></li>
<li><a href="#" target="_blank" title=""><img src="images/pic05.jpg" width="100" height="63" alt="" /></a></li>
<li><a href="#" target="_blank" title=""><img src="images/pic06.jpg" width="100" height="63" alt="" /></a></li>
</ul>
</div>
<div class="scroll_right" id="RightArr"></div>
</div>
</div>
</body>
</html>
<script src="scrollPic.js"></script>
<script>
window.onload = function(){
scrollPic();
}
function scrollPic() {
var scrollPic = new ScrollPic();
scrollPic.scrollContId = "scrollPic"; //内容容器ID
scrollPic.arrLeftId = "LeftArr";//左箭头ID
scrollPic.arrRightId = "RightArr"; //右箭头ID
scrollPic.frameWidth = 312;//Display box width
scrollPic.pageWidth = 104; //Page width
scrollPic.speed = 10; //Moving speed (unit milliseconds, the smaller the faster)
scrollPic.space = 10; //Pixels moved each time (unit px, the larger the faster)
scrollPic.autoPlay = true; //Auto-play
scrollPic.autoPlayTime = 3; //Auto-play interval time (in seconds)
scrollPic.initialize(); //Initialization
}
</script>
scrollPic.js 代码：
var sina = {
$ : function (objName) {
if (document.getElementById) {
return eval('document.getElementById("') + objName + '")')
} else {
return eval('document.all.') + objName)
}
},
isIE : navigator.appVersion.indexOf("MSIE") != -1 ? true : false,
addEvent : function (l, i, I) {
if (l.attachEvent) {
l.attachEvent("on" + i, I)
} else {
l.addEventListener(i, I, false)
}
},
delEvent : function (l, i, I) {
if (l.detachEvent) {
l.detachEvent("on"} + i, I)
} else {
l.removeEventListener(i, I, false)
}
},
readCookie : function (O) {
var o = "",
l = O + "=";
if (document.cookie.length > 0) {
var i = document.cookie.indexOf(l);
if (i != -1) {
i += l.length;
var I = document.cookie.indexOf(";", i);
if (I == -1)
I = document.cookie.length;
o = unescape(document.cookie.substring(i, I))
}
};
return o
},
writeCookie : function (i, l, o, c) {
var O = "",
I = "";
if (o != null) {
O = new Date((new Date).getTime() + o * 3600000);
O = "; expires=" + O.toGMTString()
};
if (c != null) {
I = ";domain=" + c
};
document.cookie = i + "=" + escape(l) + O + I
},
readStyle : function (I, l) {
if (I.style[l]) {
return I.style[l]
} else if (I.currentStyle) {
return I.currentStyle[l]
} else if (document.defaultView && document.defaultView.getComputedStyle) {
var i = document.defaultView.getComputedStyle(I, null);
return i.getPropertyValue(l)
} else {
return null
}
}
};
//Scroll Image Constructor
//UI&UE Dept. mengjia
//080623
function ScrollPic(scrollContId, arrLeftId, arrRightId, dotListId) {
this.scrollContId = scrollContId;
this.arrLeftId = arrLeftId;
this.arrRightId = arrRightId;
this.dotListId = dotListId;
this.dotClassName = "dotItem";
this.dotOnClassName = "dotItemOn";
this.dotObjArr = [];
this.pageWidth = 0;
this.frameWidth = 0;
this.speed = 10;
this.space = 10;
this.pageIndex = 0;
this.autoPlay = true;
this.autoPlayTime = 5;
var _autoTimeObj,
_scrollTimeObj,
_state = "ready";
this.stripDiv = document.createElement("DIV");
this.listDiv01 = document.createElement("DIV");
this.listDiv02 = document.createElement("DIV");
if (!ScrollPic.childs) {
ScrollPic.childs = []
};
this.ID = ScrollPic.childs.length;
ScrollPic.childs.push(this);
this.initialize = function () {
if (!this.scrollContId) {
throw new Error("scrollContId must be specified.");
return
};
this.scrollContDiv = sina.$(this.scrollContId);
if (!this.scrollContDiv) {
throw new Error("scrollContId is not the correct object. (scrollContId = "" + this.scrollContId + "\")");
return
};
this.scrollContDiv.style.width = this.frameWidth + "px";
this.scrollContDiv.style.overflow = "hidden";
this.listDiv01.innerHTML = this.listDiv02.innerHTML = this.scrollContDiv.innerHTML;
this.scrollContDiv.innerHTML = "";
this.scrollContDiv.appendChild(this.stripDiv);
this.stripDiv.appendChild(this.listDiv01);
this.stripDiv.appendChild(this.listDiv02);
this.stripDiv.style.overflow = "hidden";
this.stripDiv.style.zoom = "1";
this.stripDiv.style.width = "32766px";
if(-[1, ){
this.listDiv01.style.cssFloat = "left";
this.listDiv02.style.cssFloat = "left";
} else {
this.listDiv01.style.styleFloat = "left";
this.listDiv02.style.styleFloat = "left";
}
sina.addEvent(this.scrollContDiv, "mouseover", Function("ScrollPic.childs[" + this.ID + "].stop()"
sina.addEvent(this.scrollContDiv, "mouseout", Function("ScrollPic.childs[" + this.ID + "].play()"
if (this.arrLeftId) {
this.arrLeftObj = sina.$(this.arrLeftId);
if (this.arrLeftObj) {
sina.addEvent(this.arrLeftObj, "mousedown", Function("ScrollPic.childs[" + this.ID + "].rightMouseDown()"));
sina.addEvent(this.arrLeftObj, "mouseup", Function("ScrollPic.childs[" + this.ID + "].rightEnd()"));
sina.addEvent(this.arrLeftObj, "mouseout", Function("ScrollPic.childs[" + this.ID + "].rightEnd()"
}
};
if (this.arrRightId) {
this.arrRightObj = sina.$(this.arrRightId);
if (this.arrRightObj) {}}
sina.addEvent(this.arrRightObj, "mousedown", Function("ScrollPic.childs[" + this.ID + ".leftMouseDown()"));
sina.addEvent(this.arrRightObj, "mouseup", Function("ScrollPic.childs[" + this.ID + ".leftEnd()"));
sina.addEvent(this.arrRightObj, "mouseout", Function("ScrollPic.childs[" + this.ID + ".leftEnd()"))
}
};
if (this.dotListId) {
this.dotListObj = sina.$(this.dotListId);
if (this.dotListObj) {
var pages = Math.round(this.listDiv01.offsetWidth / this.frameWidth + 0.4,
i
tempObj;
for (i = 0; i < pages; i++) {
tempObj = document.createElement("span");
this.dotListObj.appendChild(tempObj);
this.dotObjArr.push(tempObj);
if (i == this.pageIndex) {
tempObj.className = this.dotClassName
} else {
tempObj.className = this.dotOnClassName
};
tempObj.title = "Page" + (i + 1) + "Page";
sina.addEvent(tempObj, "click", Function("ScrollPic.childs[" + this.ID + ".pageTo(" + i + ")")
}
}
};
if (this.autoPlay) {
this.play()
}
};
this.leftMouseDown = function () {
if (_state != "ready") {
return
};
_state = "floating";
_scrollTimeObj = setInterval("ScrollPic.childs[" + this.ID + ".moveLeft()", this.speed)
};
this.rightMouseDown = function () {
if (_state != "ready") {
return
};
_state = "floating";
_scrollTimeObj = setInterval("ScrollPic.childs[" + this.ID + ".moveRight()", this.speed)
};
this.moveLeft = function () {
if (this.scrollContDiv.scrollLeft + this.space >= this.listDiv01.scrollWidth) {
this.scrollContDiv.scrollLeft = this.scrollContDiv.scrollLeft + this.space - this.listDiv01.scrollWidth
} else {
this.scrollContDiv.scrollLeft += this.space
};
this.accountPageIndex()
};
this.moveRight = function () {
if (this.scrollContDiv.scrollLeft - this.space <= 0) {
this.scrollContDiv.scrollLeft = this.listDiv01.scrollWidth + this.scrollContDiv.scrollLeft - this.space
} else {
this.scrollContDiv.scrollLeft -= this.space
};
this.accountPageIndex()
};
this.leftEnd = function () {
if (_state != "floating") {
return
};
_state = "stoping";
clearInterval(_scrollTimeObj);
var fill = this.pageWidth - this.scrollContDiv.scrollLeft % this.pageWidth;
this.move(fill)
};
this.rightEnd = function () {
if (_state != "floating") {
return
};
_state = "stoping";
clearInterval(_scrollTimeObj);
var fill = -this.scrollContDiv.scrollLeft % this.pageWidth;
this.move(fill)
};
this.move = function (num, quick) {
var thisMove = num / 5;
if (!quick) {
if (thisMove > this.space) {
thisMove = this.space
};
if (thisMove < -this.space) {
thisMove = -this.space
}
};
if (Math.abs(thisMove) < 1 && thisMove != 0) {
thisMove = thisMove >= 0 &63; 1 : -1
} else {
thisMove = Math.round(thisMove)
};
var temp = this.scrollContDiv.scrollLeft + thisMove;
if (thisMove > 0) {
if (this.scrollContDiv.scrollLeft + thisMove >= this.listDiv01.scrollWidth) {
this.scrollContDiv.scrollLeft = this.scrollContDiv.scrollLeft + thisMove - this.listDiv01.scrollWidth
} else {
this.scrollContDiv.scrollLeft += thisMove
}
} else {
if (this.scrollContDiv.scrollLeft - thisMove <= 0) {
this.scrollContDiv.scrollLeft = this.listDiv01.scrollWidth + this.scrollContDiv.scrollLeft - thisMove
} else {
this.scrollContDiv.scrollLeft += thisMove
}
};
num -= thisMove;
if (Math.abs(num) == 0) {
_state = "ready";
if (this.autoPlay) {
this.play()
};
this.accountPageIndex();
return
} else {
this.accountPageIndex();
setTimeout("ScrollPic.childs[" + this.ID + "].move(" + num + "," + quick + )", this.speed)
}
};
this.next = function () {
if (_state != "ready") {
return
};
_state = "stoping";
this.move(this.pageWidth, true)
};
this.play = function () {
if (!this.autoPlay) {
return
};
clearInterval(_autoTimeObj);
_autoTimeObj = setInterval("ScrollPic.childs[" + this.ID + "].next()", this.autoPlayTime * 1000)
};
this.stop = function () {
clearInterval(_autoTimeObj)
};
this.pageTo = function (num) {
if (_state != "ready") {
return
};
_state = "stoping";
var fill = num * this.frameWidth - this.scrollContDiv.scrollLeft;
this.move(fill, true)
};
this.accountPageIndex = function () {
this.pageIndex = Math.round(this.scrollContDiv.scrollLeft / this.frameWidth);
if (this.pageIndex > Math.round(this.listDiv01.offsetWidth / this.frameWidth + 0.4) - 1) {
this.pageIndex = 0
};
var i;
for (i = 0; i < this.dotObjArr.length; i++) {
if (i == this.pageIndex) {
this.dotObjArr[i].className = this.dotClassName
} else {
this.dotObjArr[i].className = this.dotOnClassName
}
}
}
};
Parameter description:
var scrollPic = new ScrollPic(); //Define variables and initialize methods
scrollContId //ID of the scrolling container
arrLeftId //Left button ID
arrRightId //Right button ID
frameWidth //Display box width
pageWidth //Page width
speed //Moving speed (unit milliseconds, the smaller the faster)
space //Pixels moved each time (unit px, the larger the faster)
autoPlay //Auto-play
autoPlayTime //Auto-play interval time (in seconds)
initialize() //Initialization
Click here for complete example codeDownload on this site.
Readers who are interested in more content related to JavaScript can check the special topics on this site: 'Summary of JavaScript Switch Effects and Techniques', 'Summary of JavaScript Search Algorithm Techniques', 'Summary of JavaScript Animation Effects and Techniques', 'Summary of JavaScript Error and Debugging Techniques', 'Summary of JavaScript Data Structures and Algorithm Techniques', 'Summary of JavaScript Traversal Algorithm and Techniques', and 'Summary of JavaScript Mathematical Operation Usage'.
I hope the content described in this article will be helpful to everyone's JavaScript program design.
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