用JS实现鼠标任意拉伸DIV框,非常不错

最新推荐文章于 2023-06-01 14:35:52 发布

转载最新推荐文章于 2023-06-01 14:35:52 发布 · 2.6k 阅读

文章标签：

#div #function #fun #xhtml #object #button

本文介绍了一种基于JavaScript实现的拖拽与缩放效果，适用于网页中的元素调整大小及位置。通过定义不同方向的触发器，用户可以直观地改变元素尺寸，并且支持比例缩放与边界限制等功能。

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<!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拖拉缩放效果 <a href='http://www.pigzz.com/jscode/index.html'><u>JS代码</u></a> 站长学院www.pigzz.com</title>
    </head>
    <body>
    <script>
    var isIE = (document.all) ? true : false;
    var $ = function (id) {
    return "string" == typeof id ? document.getElementById(id) : id;
    };
    var Class = {
    create: function() {
    return function() { this.initialize.apply(this, arguments); }
    }
    }
    var Extend = function(destination, source) {
    for (var property in source) {
    destination[property] = source[property];
    }
    }
    var Bind = function(object, fun) {
    return function() {
    return fun.apply(object, arguments);
    }
    }
    var BindAsEventListener = function(object, fun) {
    var args = Array.prototype.slice.call(arguments).slice(2);
    return function(event) {
    return fun.apply(object, [event || window.event].concat(args));
    }
    }
    var CurrentStyle = function(element){
    return element.currentStyle || document.defaultView.getComputedStyle(element, null);
    }
    function addEventHandler(oTarget, sEventType, fnHandler) {
    if (oTarget.addEventListener) {
    oTarget.addEventListener(sEventType, fnHandler, false);
    } else if (oTarget.attachEvent) {
    oTarget.attachEvent("on" + sEventType, fnHandler);
    } else {
    oTarget["on" + sEventType] = fnHandler;
    }
    };
    function removeEventHandler(oTarget, sEventType, fnHandler) {
    if (oTarget.removeEventListener) {
    oTarget.removeEventListener(sEventType, fnHandler, false);
    } else if (oTarget.detachEvent) {
    oTarget.detachEvent("on" + sEventType, fnHandler);
    } else {
    oTarget["on" + sEventType] = null;
    }
    };
    //缩放程序
    var Resize = Class.create();
    Resize.prototype = {
    //缩放对象
    initialize: function(obj, options) {
    this._obj = $(obj);//缩放对象
    this._styleWidth = this._styleHeight = this._styleLeft = this._styleTop = 0;//样式参数
    this._sideRight = this._sideDown = this._sideLeft = this._sideUp = 0;//坐标参数
    this._fixLeft = this._fixTop = 0;//定位参数
    this._scaleLeft = this._scaleTop = 0;//定位坐标
    this._mxSet = function(){};//范围设置程序
    this._mxRightWidth = this._mxDownHeight = this._mxUpHeight = this._mxLeftWidth = 0;//范围参数
    this._mxScaleWidth = this._mxScaleHeight = 0;//比例范围参数
    this._fun = function(){};//缩放执行程序
    //获取边框宽度
    var _style = CurrentStyle(this._obj);
    this._borderX = (parseInt(_style.borderLeftWidth) || 0) + (parseInt(_style.borderRightWidth) || 0);
    this._borderY = (parseInt(_style.borderTopWidth) || 0) + (parseInt(_style.borderBottomWidth) || 0);
    //事件对象(用于绑定移除事件)
    this._fR = BindAsEventListener(this, this.Resize);
    this._fS = Bind(this, this.Stop);
    this.SetOptions(options);
    //范围限制
    this.Max = !!this.options.Max;
    this._mxContainer = $(this.options.mxContainer) || null;
    this.mxLeft = Math.round(this.options.mxLeft);
    this.mxRight = Math.round(this.options.mxRight);
    this.mxTop = Math.round(this.options.mxTop);
    this.mxBottom = Math.round(this.options.mxBottom);
    //宽高限制
    this.Min = !!this.options.Min;
    this.minWidth = Math.round(this.options.minWidth);
    this.minHeight = Math.round(this.options.minHeight);
    //按比例缩放
    this.Scale = !!this.options.Scale;
    this.Ratio = Math.max(this.options.Ratio, 0);
    this.onResize = this.options.onResize;
    this._obj.style.position = "absolute";
    !this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || (this._mxContainer.style.position = "relative");
    },
    //设置默认属性
    SetOptions: function(options) {
    this.options = {//默认值
    Max:       false,//是否设置范围限制(为true时下面mx参数有用)
    mxContainer:"",//指定限制在容器内
    mxLeft:       0,//左边限制
    mxRight:   9999,//右边限制
    mxTop:       0,//上边限制
    mxBottom:   9999,//下边限制
    Min:       false,//是否最小宽高限制(为true时下面min参数有用)
    minWidth:   50,//最小宽度
    minHeight:   50,//最小高度
    Scale:       false,//是否按比例缩放
    Ratio:       0,//缩放比例(宽/高)
    onResize:   function(){}//缩放时执行
    };
    Extend(this.options, options || {});
    },
    //设置触发对象
    Set: function(resize, side) {
    var resize = $(resize), fun;
    if(!resize) return;
    //根据方向设置
    switch (side.toLowerCase()) {
    case "up" :
    fun = this.Up;
    break;
    case "down" :
    fun = this.Down;
    break;
    case "left" :
    fun = this.Left;
    break;
    case "right" :
    fun = this.Right;
    break;
    case "left-up" :
    fun = this.LeftUp;
    break;
    case "right-up" :
    fun = this.RightUp;
    break;
    case "left-down" :
    fun = this.LeftDown;
    break;
    case "right-down" :
    default :
    fun = this.RightDown;
    };
    //设置触发对象
    addEventHandler(resize, "mousedown", BindAsEventListener(this, this.Start, fun));
    },
    //准备缩放
    Start: function(e, fun, touch) {
    //防止冒泡(跟拖放配合时设置)
    e.stopPropagation ? e.stopPropagation() : (e.cancelBubble = true);
    //设置执行程序
    this._fun = fun;
    //样式参数值
    this._styleWidth = this._obj.clientWidth;
    this._styleHeight = this._obj.clientHeight;
    this._styleLeft = this._obj.offsetLeft;
    this._styleTop = this._obj.offsetTop;
    //四条边定位坐标
    this._sideLeft = e.clientX - this._styleWidth;
    this._sideRight = e.clientX + this._styleWidth;
    this._sideUp = e.clientY - this._styleHeight;
    this._sideDown = e.clientY + this._styleHeight;
    //top和left定位参数
    this._fixLeft = this._styleLeft + this._styleWidth;
    this._fixTop = this._styleTop + this._styleHeight;
    //缩放比例
    if(this.Scale){
    //设置比例
    this.Ratio = Math.max(this.Ratio, 0) || this._styleWidth / this._styleHeight;
    //left和top的定位坐标
    this._scaleLeft = this._styleLeft + this._styleWidth / 2;
    this._scaleTop = this._styleTop + this._styleHeight / 2;
    };
    //范围限制
    if(this.Max){
    //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);
    };
    //根据最小值再修正
    mxRight = Math.max(mxRight, mxLeft + (this.Min ? this.minWidth : 0) + this._borderX);
    mxBottom = Math.max(mxBottom, mxTop + (this.Min ? this.minHeight : 0) + this._borderY);
    //由于转向时要重新设置所以写成function形式
    this._mxSet = function(){
    this._mxRightWidth = mxRight - this._styleLeft - this._borderX;
    this._mxDownHeight = mxBottom - this._styleTop - this._borderY;
    this._mxUpHeight = Math.max(this._fixTop - mxTop, this.Min ? this.minHeight : 0);
    this._mxLeftWidth = Math.max(this._fixLeft - mxLeft, this.Min ? this.minWidth : 0);
    };
    this._mxSet();
    //有缩放比例下的范围限制
    if(this.Scale){
    this._mxScaleWidth = Math.min(this._scaleLeft - mxLeft, mxRight - this._scaleLeft - this._borderX) * 2;
    this._mxScaleHeight = Math.min(this._scaleTop - mxTop, mxBottom - this._scaleTop - this._borderY) * 2;
    };
    };
    //mousemove时缩放 mouseup时停止
    addEventHandler(document, "mousemove", this._fR);
    addEventHandler(document, "mouseup", this._fS);
    if(isIE){
    addEventHandler(this._obj, "losecapture", this._fS);
    this._obj.setCapture();
    }else{
    addEventHandler(window, "blur", this._fS);
    e.preventDefault();
    };
    },
    //缩放
    Resize: function(e) {
    //清除选择
    window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
    //执行缩放程序
    this._fun(e);
    //设置样式，变量必须大于等于0否则ie出错
    with(this._obj.style){
    width = this._styleWidth + "px"; height = this._styleHeight + "px";
    top = this._styleTop + "px"; left = this._styleLeft + "px";
    }
    //附加程序
    this.onResize();
    },
    //缩放程序
    //上
    Up: function(e) {
    this.RepairY(this._sideDown - e.clientY, this._mxUpHeight);
    this.RepairTop();
    this.TurnDown(this.Down);
    },
    //下
    Down: function(e) {
    this.RepairY(e.clientY - this._sideUp, this._mxDownHeight);
    this.TurnUp(this.Up);
    },
    //右
    Right: function(e) {
    this.RepairX(e.clientX - this._sideLeft, this._mxRightWidth);
    this.TurnLeft(this.Left);
    },
    //左
    Left: function(e) {
    this.RepairX(this._sideRight - e.clientX, this._mxLeftWidth);
    this.RepairLeft();
    this.TurnRight(this.Right);
    },
    //右下
    RightDown: function(e) {
    this.RepairAngle(
    e.clientX - this._sideLeft, this._mxRightWidth,
    e.clientY - this._sideUp, this._mxDownHeight
    );
    this.TurnLeft(this.LeftDown) || this.Scale || this.TurnUp(this.RightUp);
    },
    //右上
    RightUp: function(e) {
    this.RepairAngle(
    e.clientX - this._sideLeft, this._mxRightWidth,
    this._sideDown - e.clientY, this._mxUpHeight
    );
    this.RepairTop();
    this.TurnLeft(this.LeftUp) || this.Scale || this.TurnDown(this.RightDown);
    },
    //左下
    LeftDown: function(e) {
    this.RepairAngle(
    this._sideRight - e.clientX, this._mxLeftWidth,
    e.clientY - this._sideUp, this._mxDownHeight
    );
    this.RepairLeft();
    this.TurnRight(this.RightDown) || this.Scale || this.TurnUp(this.LeftUp);
    },
    //左上
    LeftUp: function(e) {
    this.RepairAngle(
    this._sideRight - e.clientX, this._mxLeftWidth,
    this._sideDown - e.clientY, this._mxUpHeight
    );
    this.RepairTop(); this.RepairLeft();
    this.TurnRight(this.RightUp) || this.Scale || this.TurnDown(this.LeftDown);
    },
    //水平方向
    RepairX: function(iWidth, mxWidth) {
    iWidth = this.RepairWidth(iWidth, mxWidth);
    if(this.Scale){
    var iHeight = this.RepairScaleHeight(iWidth);
    if(this.Max && iHeight > this._mxScaleHeight){
    iHeight = this._mxScaleHeight;
    iWidth = this.RepairScaleWidth(iHeight);
    }else if(this.Min && iHeight < this.minHeight){
    var tWidth = this.RepairScaleWidth(this.minHeight);
    if(tWidth < mxWidth){ iHeight = this.minHeight; iWidth = tWidth; }
    }
    this._styleHeight = iHeight;
    this._styleTop = this._scaleTop - iHeight / 2;
    }
    this._styleWidth = iWidth;
    },
    //垂直方向
    RepairY: function(iHeight, mxHeight) {
    iHeight = this.RepairHeight(iHeight, mxHeight);
    if(this.Scale){
    var iWidth = this.RepairScaleWidth(iHeight);
    if(this.Max && iWidth > this._mxScaleWidth){
    iWidth = this._mxScaleWidth;
    iHeight = this.RepairScaleHeight(iWidth);
    }else if(this.Min && iWidth < this.minWidth){
    var tHeight = this.RepairScaleHeight(this.minWidth);
    if(tHeight < mxHeight){ iWidth = this.minWidth; iHeight = tHeight; }
    }
    this._styleWidth = iWidth;
    this._styleLeft = this._scaleLeft - iWidth / 2;
    }
    this._styleHeight = iHeight;
    },
    //对角方向
    RepairAngle: function(iWidth, mxWidth, iHeight, mxHeight) {
    iWidth = this.RepairWidth(iWidth, mxWidth);
    if(this.Scale){
    iHeight = this.RepairScaleHeight(iWidth);
    if(this.Max && iHeight > mxHeight){
    iHeight = mxHeight;
    iWidth = this.RepairScaleWidth(iHeight);
    }else if(this.Min && iHeight < this.minHeight){
    var tWidth = this.RepairScaleWidth(this.minHeight);
    if(tWidth < mxWidth){ iHeight = this.minHeight; iWidth = tWidth; }
    }
    }else{
    iHeight = this.RepairHeight(iHeight, mxHeight);
    }
    this._styleWidth = iWidth;
    this._styleHeight = iHeight;
    },
    //top
    RepairTop: function() {
    this._styleTop = this._fixTop - this._styleHeight;
    },
    //left
    RepairLeft: function() {
    this._styleLeft = this._fixLeft - this._styleWidth;
    },
    //height
    RepairHeight: function(iHeight, mxHeight) {
    iHeight = Math.min(this.Max ? mxHeight : iHeight, iHeight);
    iHeight = Math.max(this.Min ? this.minHeight : iHeight, iHeight, 0);
    return iHeight;
    },
    //width
    RepairWidth: function(iWidth, mxWidth) {
    iWidth = Math.min(this.Max ? mxWidth : iWidth, iWidth);
    iWidth = Math.max(this.Min ? this.minWidth : iWidth, iWidth, 0);
    return iWidth;
    },
    //比例高度
    RepairScaleHeight: function(iWidth) {
    return Math.max(Math.round((iWidth + this._borderX) / this.Ratio - this._borderY), 0);
    },
    //比例宽度
    RepairScaleWidth: function(iHeight) {
    return Math.max(Math.round((iHeight + this._borderY) * this.Ratio - this._borderX), 0);
    },
    //转向程序
    //转右
    TurnRight: function(fun) {
    if(!(this.Min || this._styleWidth)){
    this._fun = fun;
    this._sideLeft = this._sideRight;
    this.Max && this._mxSet();
    return true;
    }
    },
    //转左
    TurnLeft: function(fun) {
    if(!(this.Min || this._styleWidth)){
    this._fun = fun;
    this._sideRight = this._sideLeft;
    this._fixLeft = this._styleLeft;
    this.Max && this._mxSet();
    return true;
    }
    },
    //转上
    TurnUp: function(fun) {
    if(!(this.Min || this._styleHeight)){
    this._fun = fun;
    this._sideDown = this._sideUp;
    this._fixTop = this._styleTop;
    this.Max && this._mxSet();
    return true;
    }
    },
    //转下
    TurnDown: function(fun) {
    if(!(this.Min || this._styleHeight)){
    this._fun = fun;
    this._sideUp = this._sideDown;
    this.Max && this._mxSet();
    return true;
    }
    },
    //停止缩放
    Stop: function() {
    removeEventHandler(document, "mousemove", this._fR);
    removeEventHandler(document, "mouseup", this._fS);
    if(isIE){
    removeEventHandler(this._obj, "losecapture", this._fS);
    this._obj.releaseCapture();
    }else{
    removeEventHandler(window, "blur", this._fS);
    }
    }
    };
    </script>
    <style type="text/css">
    #rRightDown,#rLeftDown,#rLeftUp,#rRightUp,#rRight,#rLeft,#rUp,#rDown{
    position:absolute;
    background:#C00;
    width:7px;
    height:7px;
    z-index:5;
    font-size:0;
    }
    #rLeftDown,#rRightUp{cursor:ne-resize;}
    #rRightDown,#rLeftUp{cursor:nw-resize;}
    #rRight,#rLeft{cursor:e-resize;}
    #rUp,#rDown{cursor:n-resize;}
    #rLeftDown{left:-4px;bottom:-4px;}
    #rRightUp{right:-4px;top:-4px;}
    #rRightDown{right:-4px;bottom:-4px;background-color:#00F;}
    #rLeftUp{left:-4px;top:-4px;}
    #rRight{right:-4px;top:50%;margin-top:-4px;}
    #rLeft{left:-4px;top:50%;margin-top:-4px;}
    #rUp{top:-4px;left:50%;margin-left:-4px;}
    #rDown{bottom:-4px;left:50%;margin-left:-4px;}
    #bgDiv{width:600px; height:300px; border:10px solid #666666; position:relative;}
    #dragDiv{border:1px solid #000000; width:100px; height:60px; top:50px; left:50px; background:#fff;}
    </style>
    <div id="bgDiv">
    <div id="dragDiv">
    <div id="rRightDown"> </div>
    <div id="rLeftDown"> </div>
    <div id="rRightUp"> </div>
    <div id="rLeftUp"> </div>
    <div id="rRight"> </div>
    <div id="rLeft"> </div>
    <div id="rUp"> </div>
    <div id="rDown"></div>
    </div>
    </div>
    <input id="idScale" type="button" value="设置比例" />
    <input id="idMin" type="button" value="设置最小范围" />
    <script>
    var rs = new Resize("dragDiv", { Max: true, mxContainer: "bgDiv" });
    rs.Set("rRightDown", "right-down");
    rs.Set("rLeftDown", "left-down");
    rs.Set("rRightUp", "right-up");
    rs.Set("rLeftUp", "left-up");
    rs.Set("rRight", "right");
    rs.Set("rLeft", "left");
    rs.Set("rUp", "up");
    rs.Set("rDown", "down");
    $("idScale").onclick = function(){
    if(rs.Scale){
    this.value = "设置比例";
    rs.Scale = false;
    }else{
    this.value = "取消比例";
    rs.Ratio = 0;
    rs.Scale = true;
    }
    }
    $("idMin").onclick = function(){
    if(rs.Min){
    this.value = "设置最小范围";
    rs.Min = false;
    }else{
    this.value = "取消最小范围";
    rs.Min = true;
    }
    }
    </script>    <p>小猪站长学院致力于网页标准的传播,提供DIV CSS XHTML等学习教材,标准化的网页代码</p>
    <p>符合W3C标准的网页设计,提供建站资源,设计字体等资源下载的综合性站长学习平台</p>
    <p>你所下载的代码来自<a href="http://www.pigzz.com" _fcksavedurl="http://www.pigzz.com">小猪站长学院</a> ,欢迎下载使用</p>
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    </html>