js通过八个点 拖动改变div大小的实现方法_javascript技巧

复制代码 代码如下:

<script> <BR>var Sys = (function(ua){ <BR> var s = {}; <BR> s.IE = ua.match(/msie ([\d.]+)/)?true:false; <BR> s.Firefox = ua.match(/firefox\/([\d.]+)/)?true:false; <BR> s.Chrome = ua.match(/chrome\/([\d.]+)/)?true:false; <BR> s.IE6 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 6))?true:false; <BR> s.IE7 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 7))?true:false; <BR> s.IE8 = (s.IE&&([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 8))?true:false; <BR> return s; <BR>})(navigator.userAgent.toLowerCase()); <P>var $ = function (id) { <BR> return document.getElementById(id); <BR>}; <P>var Css = function(e,o){ <BR> for(var i in o) <BR> e.style[i] = o[i]; <BR>}; <P>var Extend = function(destination, source) { <BR> for (var property in source) { <BR> destination[property] = source[property]; <BR> } <BR>}; <P>var Bind = function(object, fun) { <BR> var args = Array.prototype.slice.call(arguments).slice(2); <BR> return function() { <BR> return fun.apply(object, args); <BR> } <BR>}; <P>var BindAsEventListener = function(object, fun) { <BR> var args = Array.prototype.slice.call(arguments).slice(2); <BR> return function(event) { <BR> return fun.apply(object, [event || window.event].concat(args)); <BR> } <BR>}; <P>var CurrentStyle = function(element){ <BR> return element.currentStyle || document.defaultView.getComputedStyle(element, null); <BR>}; <P>function addListener(element,e,fn){ <BR> element.addEventListener?element.addEventListener(e,fn,false):element.attachEvent("on" + e,fn); <BR>}; <BR>function removeListener(element,e,fn){ <BR> element.removeEventListener?element.removeEventListener(e,fn,false):element.detachEvent("on" + e,fn) <BR>}; <P>var Class = function(properties){ <BR> var _class = function(){return (arguments[0] !== null && this.initialize && typeof(this.initialize) == 'function') ? this.initialize.apply(this, arguments) : this;}; <BR> _class.prototype = properties; <BR> return _class; <BR>}; <P>var Resize =new Class({ <BR> initialize : function(obj){ <BR> this.obj = obj; <BR> this.resizeelm = null; <BR> this.fun = null; //记录触发什么事件的索引 <BR> this.original = []; //记录开始状态的数组 <BR> this.width = null; <BR> this.height = null; <BR> this.fR = BindAsEventListener(this,this.resize); <BR> this.fS = Bind(this,this.stop); <BR> }, <BR> set : function(elm,direction){ <BR> if(!elm)return; <BR> this.resizeelm = elm; <BR> addListener(this.resizeelm,'mousedown',BindAsEventListener(this, this.start, this[direction])); <BR> return this; <BR> }, <BR> start : function(e,fun){ <BR> this.fun = fun; <BR> this.original = [parseInt(CurrentStyle(this.obj).width),parseInt(CurrentStyle(this.obj).height),parseInt(CurrentStyle(this.obj).left),parseInt(CurrentStyle(this.obj).top)];<BR> this.width = (this.original[2]||0) + this.original[0]; <BR> this.height = (this.original[3]||0) + this.original[1]; <BR> addListener(document,"mousemove",this.fR); <BR> addListener(document,'mouseup',this.fS); <BR> }, <BR> resize : function(e){ <BR> this.fun(e); <BR> Sys.IE?(this.resizeelm.onlosecapture=function(){this.fS()}):(this.resizeelm.onblur=function(){this.fS()}) <BR> }, <BR> stop : function(){ <BR> removeListener(document, "mousemove", this.fR); <BR> removeListener(document, "mousemove", this.fS); <BR> window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); <BR> }, <BR> up : function(e){ <BR> this.height>e.clientY?Css(this.obj,{top:e.clientY + "px",height:this.height-e.clientY + "px"}):this.turnDown(e); <BR> }, <BR> down : function(e){ <BR> e.clientY>this.original[3]?Css(this.obj,{top:this.original[3]+'px',height:e.clientY-this.original[3]+'px'}):this.turnUp(e); <BR> }, <BR> left : function(e){ <BR> e.clientX<this.width?Css(this.obj,{left:e.clientX +'px',width:this.width-e.clientX + "px"}):this.turnRight(e); <BR> }, <BR> right : function(e){ <BR> e.clientX>this.original[2]?Css(this.obj,{left:this.original[2]+'px',width:e.clientX-this.original[2]+"px"}):this.turnLeft(e) ; <BR> }, <BR> leftUp:function(e){ <BR> this.up(e);this.left(e); <BR> }, <BR> leftDown:function(e){ <BR> this.left(e);this.down(e); <BR> }, <BR> rightUp:function(e){ <BR> this.up(e);this.right(e); <BR> }, <BR> rightDown:function(e){ <BR> this.right(e);this.down(e); <BR> }, <BR> turnDown : function(e){ <BR> Css(this.obj,{top:this.height+'px',height:e.clientY - this.height + 'px'}); <BR> }, <BR> turnUp : function(e){ <BR> Css(this.obj,{top : e.clientY +'px',height : this.original[3] - e.clientY +'px'}); <BR> }, <BR> turnRight : function(e){ <BR> Css(this.obj,{left:this.width+'px',width:e.clientX- this.width +'px'}); <BR> }, <BR> turnLeft : function(e){ <BR> Css(this.obj,{left:e.clientX +'px',width:this.original[2]-e.clientX+'px'}); <BR> } <BR>}); <BR>window.onload = function(){ <BR> new Resize($('ss')).set($('rUp'),'up').set($('rDown'),'down').set($('rLeft'),'left').set($('rRight'),'right').set($('rLeftUp'),'leftUp').set($('rLeftDown'),'leftDown').set($('rRightDown'),'rightDown').set($('rRightUp'),'rightUp');<BR>} <BR></script>