判断可拖动div是否重合重合多少

更新时间：2010年08月12日 11:24:21 作者：

效率较低该如何优化了

<!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>Table</title> </head> <style type="text/css"> body{margin:0px; padding:0px; font-size:12px} .div{height:160px;width:160px;position:absolute; text-align:center; } .demo1{ border:1px solid #96C2F1;background-color:#EFF7FF;left:150px;top:20px} .demo2{ border:1px solid #9BDF70;background-color:#F0FBEB;left:450px;top:20px} .demo3{ border:1px solid #BBE1F1;background-color:#EEFAFF;left:750px;top:20px} .demo4{ border:1px solid #96C2F1;background-color:#EEFAFF;left:150px;top:220px} .demo5{ border:1px solid #FFCC00;background-color:#FFFFF7;left:450px;top:220px} .demo6{ border:1px solid #E3E197;background-color:#FFFFDD;left:750px;top:220px} .demo7{ border:1px solid #ADCD3C;background-color:#F2FDDB;left:150px;top:420px} .demo8{ border:1px solid #F8B3D0;background-color:#FFF5FA;left:450px;top:420px} .demo9{ border:1px solid #D3D3D3;background-color:#F7F7F7;left:750px;top:420px} .focus{background-color: #990000;} </style> <body > <div id='demo1' class='div demo1'>demo1</div> <div id='demo2' class='div demo2'>demo2</div> <div id='demo3' class='div demo3'>demo3</div> <div id='demo4' class='div demo4'>demo4</div> <div id='demo5' class='div demo5'>demo5</div> <div id='demo6' class='div demo6'>demo6</div> <div id='demo7' class='div demo7'>demo7</div> <div id='demo8' class='div demo8'>demo8</div> <div id='demo9' class='div demo9'>demo9</div> <script language="javascript"> (function(window,undefined){ window.Sys = function (ua){ var b = { ie: /msie/.test(ua) && !/opera/.test(ua), opera: /opera/.test(ua), safari: /webkit/.test(ua) && !/chrome/.test(ua), firefox: /firefox/.test(ua), chrome: /chrome/.test(ua) },vMark = ""; for (var i in b) { if (b[i]) { vMark = "safari" == i ? "version" : i; break; } } b.version = vMark && RegExp("(?:" + vMark + ")[\\/: ]([\\d.]+)").test(ua) ? RegExp.$1 : "0"; b.ie6 = b.ie && parseInt(b.version, 10) == 6; b.ie7 = b.ie && parseInt(b.version, 10) == 7; b.ie8 = b.ie && parseInt(b.version, 10) == 8; return b; }(window.navigator.userAgent.toLowerCase()); window.Sys.ie6&&document.execCommand("BackgroundImageCache", false, true); window.$ = function(Id){ return document.getElementById(Id); }; window.addListener = function(element,e,fn){ !element.events&&(element.events = {}); element.events[e]&&(element.events[e][addListener.guid++]=fn)||(element.events[e] = {'0':fn}); element.addEventListener?element.addEventListener(e,fn,false):element.attachEvent("on" + e,fn); }; window.addListener.guid = 1; window.removeListener = function(element,e,fn){ var handlers = element.events[e],type; if(fn){ for(type in handlers) if(handlers[type]===fn){ element.removeEventListener?element.removeEventListener(e,fn,false):element.detachEvent("on" + e,fn); delete handlers[type]; } }else{ for(type in handlers){ element.removeEventListener?element.removeEventListener(e,handlers[type],false):element.detachEvent("on" + e,handlers[type]); delete handlers[type]; } } }; window.setStyle = function(e,o){ if(typeof o=="string") e.style.cssText=o; else for(var i in o) e.style[i] = o[i]; }; var slice = Array.prototype.slice; window.Bind = function(object, fun) { var args = slice.call(arguments).slice(2); return function() { return fun.apply(object, args); }; }; window.BindAsEventListener = function(object, fun,args) { var args = slice.call(arguments).slice(2); return function(event) { return fun.apply(object, [event || window.event].concat(args)); } }; //copy from jQ window.extend = function(){ var target = arguments[0] || {}, i = 1, length = arguments.length, deep = true, options; if ( typeof target === "boolean" ) { deep = target; target = arguments[1] || {}; i = 2; } if ( typeof target !== "object" && Object.prototype.toString.call(target)!="[object Function]") target = {}; for(;i<length;i++){ if ( (options = arguments[ i ]) != null ) for(var name in options){ var src = target[ name ], copy = options[ name ]; if ( target === copy ) continue; if ( deep && copy && typeof copy === "object" && !copy.nodeType ){ target[ name ] = arguments.callee( deep, src || ( copy.length != null ? [ ] : { } ), copy ); } else if(copy !== undefined) target[ name ] = copy; } } return target; }; //copy from jQ window.each = function ( object, callback, args ) { var name, i = 0, length = object.length; if ( args ) { args = Array.prototype.slice.call(arguments).slice(2); if ( length === undefined ) { for ( name in object ) if ( callback.apply( object[ name ],[name,object[ name ]].concat(args) ) === false ) break; } else for ( ; i < length; i++) if ( callback.apply( object[ i ],[i,object[ i ]].concat(args)) === false ) // break; } else { if ( length === undefined ) { for ( name in object ) if ( callback.call( object[ name ], name, object[ name ] ) === false ) break; } else for ( var value = object[0]; i < length && callback.call( value, i, value ) !== false; value = object[++i] ){} } return object; }; window.currentStyle = function(element){ return element.currentStyle || document.defaultView.getComputedStyle(element, null); }; window.objPos = function(elem){ var left = 0, top = 0, right = 0, bottom = 0,doc = elem ? elem.ownerDocument : document; if ( !elem.getBoundingClientRect || window.Sys.ie8 ) { var n = elem; while (n) { left += n.offsetLeft, top += n.offsetTop; n = n.offsetParent; }; right = left + elem.offsetWidth; bottom = top + elem.offsetHeight; } else { var rect = elem.getBoundingClientRect(); left = right = doc.documentElement.scrollLeft || doc.body.scrollLeft; top = bottom = doc.documentElement.scrollLeft || doc.body.scrollLeft; left += rect.left; right += rect.right; top += rect.top; bottom += rect.bottom; } return { "left": left, "top": top, "right": right, "bottom": bottom }; }; window.hasClass = function(element, className){ return element.className.match(new RegExp('(\\s|^)'+className+'(\\s|$)')); }; window.addClass = function(element, className){ !window.hasClass(element, className)&&(element.className += " "+className); }; window.removeClass = function(element, className){ window.hasClass(element, className)&&(element.className = element.className.replace(new RegExp('(\\s|^)'+className+'(\\s|$)'),' ')); } })(window); var Drag = { elem : null, zindex : 0, options : {}, init : function(){ each(arguments,function(i,elem,oThis){ addListener(elem,'mousedown',BindAsEventListener(oThis,oThis.start,elem)); },this); }, start : function(e,elem){ var elem=this.elem = elem; elem.style.zIndex=++this.zindex; this.x = e.clientX - elem.offsetLeft ; this.y = e.clientY - elem.offsetTop; this.marginLeft = parseInt(currentStyle(elem).marginLeft)||0; this.marginTop = parseInt(currentStyle(elem).marginTop)||0; Sys.ie?elem.setCapture():e.preventDefault(); addListener(document,"mousemove",BindAsEventListener(this,this.move)); addListener(document,"mouseup",Bind(this,this.up)); this.options.callbackmove&&this.options.callbackmove(this.elem); }, move : function(e){ window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty(); var iLeft = e.clientX - this.x,iTop = e.clientY - this.y;obj = this.elem; obj.style.left = iLeft - this.marginLeft + "px"; obj.style.top = iTop - this.marginTop + "px"; this.options.callbackmove&&this.options.callbackmove(this.elem); }, up : function(){ removeListener(document,'mousemove'); removeListener(document,'mouseup'); Sys.ie&&this.elem.releaseCapture(); this.options.callbackup&&this.options.callbackup(this.elem); } }; var overlap = { hostel :{}, //所有需要计算重合的元素 overlapList :{}, //已经重合的元素 init : function(elems){ each(elems,function(i,elem,oThis){ elem.setAttribute('overlap',i); var ret = objPos(elem),l=ret.left,t=ret.top,b=ret.bottom,r=ret.right; oThis.hostel[i]={elem:elem,leftTopDot:{x:l,y:t},leftBottomDot:{x:l,y:b},rightTopDot:{x:r,y:t},rightBottomDot:{x:r,y:b}}; },this); }, setElem:function(elem){ if(!elem)return; var ret = objPos(elem),l=ret.left,t=ret.top,b=ret.bottom,r=ret.right; this.hostel[elem.getAttribute('overlap')] ={elem:elem,leftTopDot:{x:l,y:t},leftBottomDot:{x:l,y:b},rightTopDot:{x:r,y:t},rightBottomDot:{x:r,y:b}}; }, //判断是否重合 isOverlap : function(my){ var obj= {}, my = this.hostel[my.getAttribute('overlap')]; each(this.hostel,function(key,config,oThis){ // 是元素本身 则返回 if(config.elem === my.elem)return ; //判断2个div是否重合 如果不重合 则返回 if(my.leftBottomDot.y<=config.leftTopDot.y||my.leftTopDot.y>=config.leftBottomDot.y||my.rightTopDot.x<=config.leftTopDot.x||my.leftTopDot.x>=config.rightTopDot.x) return; obj[config.elem.getAttribute('overlap')] =[config.elem,oThis.howOverlap(my,config)]; },this); return obj; }, //判断重合面积 howOverlap : function(my,other){ var l=other.leftBottomDot.x,r=other.rightTopDot.x,t=other.leftTopDot.y,b=other.leftBottomDot.y,arr=[], lt = this.include(my.leftTopDot,l,r,t,b,'leftTopDot-rightBottomDot'), lb = this.include(my.leftBottomDot,l,r,t,b,'leftBottomDot-rightTopDot'), rt = this.include(my.rightTopDot,l,r,t,b,'rightTopDot-leftBottomDot'), rb = this.include(my.rightBottomDot,l,r,t,b,'rightBottomDot-leftTopDot'); lt&&arr.push(lt)||lb&&arr.push(lb)||rt&&arr.push(rt)||rb&&arr.push(rb); if(!arr[0]) return 0; //一个点 或者是 2个点都在其中 计算方法是一样的 if(arr.length===1||arr.length===2){ var key = arr[0].split('-'),x1=my[key[0]].x,y1=my[key[0]].y,x2=other[key[1]].x,y2=other[key[1]].y; return Math.abs((x1-x2)*(y1-y2)); }; //完全重合 if(arr.length===4){ return 162*162; }; }, //看点是不是在另一个div中 include : function(dot,l,r,t,b,key){ return (dot.x>=l&&dot.x<=r&&dot.y>=t&&dot.y<=b)?key:false; } }; window.onload = function(){ extend(Drag.options,{callbackmove:move,callbackup:up}); function up(elem){ for(var n in overlap.overlapList) removeClass(overlap.overlapList[n][0],'focus') overlap.overlapList = {}; Drag.elem.innerHTML =Drag.elem.id; }; function move(elem){ overlap.setElem(elem); //p为判断返回的obj是不是空的 var obj = overlap.isOverlap(elem),name,p = function(o){ for (name in o) return false; return true; }(obj); //如果是个空对象 则返回 不进行下面的遍历 if(p){ up(); return; }; var str =''; overlap.overlapList = obj; each(overlap.hostel,function(key,config){ if(obj[key]){ addClass(obj[key][0],'focus'); str = str +'与'+obj[key][0].id+'重合的面积为:'+obj[key][1]+'</br>'; }else{ removeClass(config.elem,'focus'); } }); Drag.elem.innerHTML = str; }; Drag.init($('demo1'),$('demo2'),$('demo3'),$('demo4'),$('demo5'),$('demo6'),$('demo7'),$('demo8'),$('demo9')); overlap.init([$('demo1'),$('demo2'),$('demo3'),$('demo4'),$('demo5'),$('demo6'),$('demo7'),$('demo8'),$('demo9')]); }; </script> </body> </html>

[Ctrl+A 全选注:引入外部Js需再刷新一下页面才能执行]

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