JavaScript 滑动条控制百分比

最新推荐文章于 2023-08-19 22:32:16 发布

转载最新推荐文章于 2023-08-19 22:32:16 发布 · 6k 阅读

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本文介绍了一种基于JavaScript的滑动条效果实现方案，包括拖放、鼠标滚轮及键盘控制等功能。提供了完整的代码示例及样式配置。

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页面代码如下

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>JavaScript 滑动条效果</title> </head> <body> <mce:script type="text/javascript"></mce:script> <mce:script type="text/javascript" src="Drag.js" mce_src="Drag.js"></mce:script> <mce:style type="text/css"></mce:style><style type="text/css" mce_bogus="1">.container{width:600px; background:#3E3E3E; overflow:hidden; color:#fff; padding:10px 20px;} .content{ overflow:hidden; margin-bottom:10px;width:600px;} .content div{ width:130px; margin:5px; padding:5px; padding-bottom:0; height:120px; line-height:20px; background-color:#000000;} .content div img{ width:130px; height:100px; border:0;display:block;} .slider{ padding:1px 0; position:relative;background:#0A0A0A; height:15px; border-bottom:1px solid #545454;border-top:1px solid #545454; float:left; width:544px;cursor:pointer; } .slider_left, .slider_right{ background:url(http://pic002.cnblogs.com/img/cloudgamer/200812/2008122223581198.gif) no-repeat; height:19px; width:28px; float:left; cursor:pointer;} .slider_left{background-position:left top;} .slider_right{background-position:right top;} .bar{ height:15px; width:150px; background:url(http://pic002.cnblogs.com/img/cloudgamer/200812/2008122223573480.gif) left top repeat-x;} .bar_left, .bar_right{background:url(http://pic002.cnblogs.com/img/cloudgamer/200812/2008122223580168.gif) no-repeat;height:15px; _font-size:0; width:6px; position:absolute; top:0px;} .bar_left{background-position:left top;left:-6px;} .bar_right{background-position:right top;right:-6px;}</style> <br /> <p>预览效果3：</p> <mce:style type="text/css"></mce:style><style type="text/css" mce_bogus="1">.slider3{height:19px; width:600px; background-color:#eee; border:2px solid #EAE6DD; margin:10px 0;} .bar3 {height:15px; width:10px; border:2px outset buttonhighlight; background-color:#D4D0C8;_font-size:0; }</style> <div id="idSlider3" class="slider3"> <div id="idBar3" class="bar3"></div> </div> <div id="idShow"> 当前值：<span id="idCurrentValue"></span><br /> 当前百分比：<span id="idCurrentPercent"></span>%<br /> 状态：<span id="idCurrentState">未开始</span><br /> 设置最小值： <input id="txtMin" type="text" value="0" size="5" /> 设置最大值： <input id="txtMax" type="text" value="100" size="5" /> <br /> 移动到： <input id="txtMove" type="text" value="50" size="5" /> <input id="btnMoveV" type="button" value="按实际值" /> <input id="btnMoveP" type="button" value="按百分比" /> <br /> <input id="btnEase" type="button" value="设置缓动" /> </div> <mce:script type="text/javascript"></mce:script> </body> </html>

脚本文件Drag.js代码如下

//拖放程序 var Drag = Class.create(); Drag.prototype = { //拖放对象 initialize: function(drag, options) { this.Drag = $(drag);//拖放对象 this._x = this._y = 0;//记录鼠标相对拖放对象的位置 this._marginLeft = this._marginTop = 0;//记录margin //事件对象(用于绑定移除事件) this._fM = BindAsEventListener(this, this.Move); this._fS = Bind(this, this.Stop); this.SetOptions(options); this.Limit = !!this.options.Limit; this.mxLeft = parseInt(this.options.mxLeft); this.mxRight = parseInt(this.options.mxRight); this.mxTop = parseInt(this.options.mxTop); this.mxBottom = parseInt(this.options.mxBottom); this.LockX = !!this.options.LockX; this.LockY = !!this.options.LockY; this.Lock = !!this.options.Lock; this.onStart = this.options.onStart; this.onMove = this.options.onMove; this.onStop = this.options.onStop; this._Handle = $(this.options.Handle) || this.Drag; this._mxContainer = $(this.options.mxContainer) || null; this.Drag.style.position = "absolute"; //透明 if(isIE && !!this.options.Transparent){ //填充拖放对象 with(this._Handle.appendChild(document.createElement("div")).style){ width = height = "100%"; backgroundColor = "#fff"; filter = "alpha(opacity:0)"; fontSize = 0; } } //修正范围 this.Repair(); addEventHandler(this._Handle, "mousedown", BindAsEventListener(this, this.Start)); }, //设置默认属性 SetOptions: function(options) { this.options = {//默认值 Handle: "",//设置触发对象（不设置则使用拖放对象） Limit: false,//是否设置范围限制(为true时下面参数有用,可以是负数) mxLeft: 0,//左边限制 mxRight: 9999,//右边限制 mxTop: 0,//上边限制 mxBottom: 9999,//下边限制 mxContainer: "",//指定限制在容器内 LockX: false,//是否锁定水平方向拖放 LockY: false,//是否锁定垂直方向拖放 Lock: false,//是否锁定 Transparent: false,//是否透明 onStart: function(){},//开始移动时执行 onMove: function(){},//移动时执行 onStop: function(){}//结束移动时执行 }; Extend(this.options, options || {}); }, //准备拖动 Start: function(oEvent) { if(this.Lock){ return; } this.Repair(); //记录鼠标相对拖放对象的位置 this._x = oEvent.clientX - this.Drag.offsetLeft; this._y = oEvent.clientY - this.Drag.offsetTop; //记录margin this._marginLeft = parseInt(CurrentStyle(this.Drag).marginLeft) || 0; this._marginTop = parseInt(CurrentStyle(this.Drag).marginTop) || 0; //mousemove时移动 mouseup时停止 addEventHandler(document, "mousemove", this._fM); addEventHandler(document, "mouseup", this._fS); if(isIE){ //焦点丢失 addEventHandler(this._Handle, "losecapture", this._fS); //设置鼠标捕获 this._Handle.setCapture(); }else{ //焦点丢失 addEventHandler(window, "blur", this._fS); //阻止默认动作 oEvent.preventDefault(); }; //附加程序 this.onStart(); }, //修正范围 Repair: function() { if(this.Limit){ //修正错误范围参数 this.mxRight = Math.max(this.mxRight, this.mxLeft + this.Drag.offsetWidth); this.mxBottom = Math.max(this.mxBottom, this.mxTop + this.Drag.offsetHeight); //如果有容器必须设置position为relative来相对定位，并在获取offset之前设置 !this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || CurrentStyle(this._mxContainer).position == "absolute" || (this._mxContainer.style.position = "relative"); } }, //拖动 Move: function(oEvent) { //判断是否锁定 if(this.Lock){ this.Stop(); return; }; //清除选择 window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); //设置移动参数 this.SetPos(oEvent.clientX - this._x, oEvent.clientY - this._y); }, //设置位置 SetPos: function(iLeft, iTop) { //设置范围限制 if(this.Limit){ //设置范围参数 var mxLeft = this.mxLeft, mxRight = this.mxRight, mxTop = this.mxTop, mxBottom = this.mxBottom; //如果设置了容器，再修正范围参数 if(!!this._mxContainer){ mxLeft = Math.max(mxLeft, 0); mxTop = Math.max(mxTop, 0); mxRight = Math.min(mxRight, this._mxContainer.clientWidth); mxBottom = Math.min(mxBottom, this._mxContainer.clientHeight); }; //修正移动参数 iLeft = Math.max(Math.min(iLeft, mxRight - this.Drag.offsetWidth), mxLeft); iTop = Math.max(Math.min(iTop, mxBottom - this.Drag.offsetHeight), mxTop); } //设置位置，并修正margin if(!this.LockX){ this.Drag.style.left = iLeft - this._marginLeft + "px"; } if(!this.LockY){ this.Drag.style.top = iTop - this._marginTop + "px"; } //附加程序 this.onMove(); }, //停止拖动 Stop: function() { //移除事件 removeEventHandler(document, "mousemove", this._fM); removeEventHandler(document, "mouseup", this._fS); if(isIE){ removeEventHandler(this._Handle, "losecapture", this._fS); this._Handle.releaseCapture(); }else{ removeEventHandler(window, "blur", this._fS); }; //附加程序 this.onStop(); } };

效果如图：

效果图