兼容ie和ff的无缝滚动

来源：互联网发布：基于单片机数字温度计编辑：程序博客网时间：2024/05/29 16:38

<html>
<head>
    <title></title>
    <script language="javascript" type="text/javascript">
        function VScrollPanel() {
            this.width = null; //滚动范围宽度
            this.height = null; //滚动范围高度
            this.delay = 100; //时间延迟
            this.step = 1; //单步滚动像素
        }
        VScrollPanel.prototype = {
            //滚动指定ID的内容
            Bind: function (domID) {
                this.dom = document.getElementById(domID);
                if (this.width) {
                    this.dom.style.width = this.width + "px";
                }
                if (this.height) {
                    this.dom.style.height = this.height + "px";
                }
                this.dom.style.overflow = "hidden";

                this.Scrolling();
            },
            //滚动方法
            Scrolling: function () {
                //如果内容太少,已经完全可以显示,不需滚动
                if (this.dom.scrollHeight <= this.dom.clientHeight) return;

                //滚动到最后一项,切换位置
                if (this.willSwap) {
                    this.dom.appendChild(this.lastOne);
                    this.willSwap = false;
                }

                //一个对象自身的引用
                var _this = this;

                if (this.dom.scrollTop+ this.step + this.dom.clientHeight
                    >= this.dom.scrollHeight) {
                    //滚动到达底部

                    //删除临时添加的首项
                    if (this.tmp != null) this.dom.removeChild(this.tmp);

                    //复制第一项,即将移至最后一项
                    this.lastOne = this.dom.firstChild;
                    this.tmp = this.lastOne.cloneNode(true);

                    //添加第一项
                    //this.lastOne.replaceNode(this.tmp);
                    //在此用replaceChild替代replaceNode即可兼容FF
                    this.dom.replaceChild(this.tmp,this.lastOne);
                    /*至于为什么要复制第一项，并临时插入
                    是因为如果在滚动内容刚好足够滚动时，如果没有这个临时项，
                    直接移动第一项到最后一项的时候，会发生跳动现象。
                    也就是，比如：如果有4项，不会发生滚动，而如果有5项的时候，就发生这种现象
                    但6项以上的时候，正常*/

                    this.willSwap = true;
                }
                this.dom.scrollTop += this.step;
                setTimeout(function () {
                        /*此处必须用 _this 代替 this 否则错误，原因在此不阐述*/
                        _this.Scrolling();
                    }, this.delay);
            },
            Pause: function () {
                this.pauseStep = this.step;
                this.step = 0;
            },
            Continue: function () {
                this.step = this.pauseStep;
            }
        };

        /*经过多次实验，水平滚动通过新建一个表格来设置布局
        才能最有效的保证布局不会乱，不会发生换行
        所以只好水平、垂直滚动的分开做了*/

        //水平滚动。以下代码思路同上，不再注释
        function HScrollPanel() {
            this.width = null;
            this.height = null;
            this.delay = 100;
            this.step = 1;
        }
        HScrollPanel.prototype = {
            Bind: function (domID) {
                this.dom = document.getElementById(domID);
                this.rootDom = document.createElement("table");
                this.rootDom.border = "0";
                this.rootDom.cellPadding = "0";
                this.rootDom.cellSpacing = "0";
                var tbody = document.createElement("tbody");
                this.rootDom.appendChild(tbody);
                this.row = document.createElement("tr");
                tbody.appendChild(this.row);

                var child = this.dom.firstChild;
                while (child != null) {
                    this.dom.removeChild(child);
                    if (child.nodeType == 1) {
                        var td = document.createElement("td");
                        td.vAlign = "top";
                        td.appendChild(child);
                        this.row.appendChild(td);
                    }
                    child = this.dom.firstChild;
                }
                this.dom.appendChild(this.rootDom);

                if (this.width) {
                    this.dom.style.width = this.width + "px";
                }
                if (this.height) {
                    this.dom.style.height = this.height + "px";
                }
                this.dom.style.overflow = "hidden";
                this.Scrolling();
            },
            Scrolling: function () {
                if (this.dom.scrollWidth <= this.dom.clientWidth) return;
                if (this.willSwap) {
                    this.row.appendChild(this.lastOne);
                    this.willSwap = false;
                }
                var _this = this;
                if (this.dom.scrollLeft + this.step + this.dom.clientWidth
                    >= this.dom.scrollWidth) {
                    if (this.tmp != null) {
                        this.row.removeChild(this.tmp);
                    }
                    this.lastOne = this.row.firstChild;
                    this.tmp = this.lastOne.cloneNode(true);
                    //this.lastOne.replaceNode(this.tmp);
                    this.row.replaceChild(this.tmp,this.lastOne);
                    this.willSwap = true;
                }
                this.dom.scrollLeft += this.step;
                setTimeout(function () { _this.Scrolling(); }, this.delay);
            },
            Pause: function () {
                this.pauseStep = this.step;
                this.step = 0;
            },
            Continue: function () {
                this.step = this.pauseStep;
            }
        };
    </script>
    <style type="text/css">
        body,td
        {
            font-family:"宋体";
            font-size:12px;
        }
        .item
        {
            width:150px;
            background-color:#f0f0f0;
            text-align:center;
            margin:5px;
            padding:3px;
        }
    </style>
</head>
<body>
垂直滚动示例<input type="text" value="100" onchange="SetDelay(this);" />
<div id="divVScroll" onmouseover="vsp.Pause();" onmouseout="vsp.Continue()">
    <div class="item">AAAAAA</div>
    <div class="item">BBBBBB</div>
    <div class="item">CCCCCC</div>
    <div class="item">DDDDDD</div>
    <div class="item">EEEEEE</div>
    <div class="item">FFFFFF</div>
    <div class="item">GGGGGG</div>
</div>
    <script language="javascript" type="text/javascript">
        var vsp = new VScrollPanel();
        vsp.height = 100;
        vsp.Bind("divVScroll");
        function SetDelay(tb){
            vsp.delay=tb.value
        }
    </script>
<br /><br />
水平滚动示例
<div id="divHScroll" onmouseover="hsp.Pause();" onmouseout="hsp.Continue()">
    <div class="item">AAAAAA</div>
    <div class="item">BBBBBB</div>
    <div class="item">CCCCCC</div>
    <div class="item">DDDDDD</div>
    <div class="item">EEEEEE</div>
    <div class="item">FFFFFF</div>
    <div class="item">GGGGGG</div>
</div>
    <script language="javascript" type="text/javascript">
        var hsp = new HScrollPanel();
        hsp.width = 400;
        hsp.delay = 10;
        hsp.Bind("divHScroll");
    </script>
</body>
</html>