JavaScript模块随意拖动_层和布局特效

JavaScript模块随意拖动，自动吸附到距规定区域最近的地方，还可以适时保存，不过保存功能兼容性不是很好。

<!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" mrc="text/html; charset=gb2312" />
<title>JavaScript模块随意拖动</title>
	<style type="text/css">
	html{
		width:100%;
		overflow-x:hidden;
	}
	body{
		font-family: Trebuchet MS, Lucida Sans Unicode, Arial, sans-serif;
		width:100%;
		margin:0px;
		padding:0px;
		text-align:center;
		background-color:#E2EBED;	
		font-size:0.7em;	
		overflow-x:hidden;
	}
		
	#mainContainer{
		width:600px;
		margin:0 auto;
		text-align:left;
		background-color:#FFF;
	}
	h4{
		margin:0px;
	}
	p{
		margin-top:5px;
	}
	#dragableElementsParentBox{
		padding:10px;
	}
	
	.smallArticle,.bigArticle{
		float:left;
		border:1px solid #000;
		background-color:#DDD;
		padding:2px;
		margin-right:10px;
		margin-bottom:5px;
	}
	.smallArticle img,.bigArticle img{
		float:left;
		padding:5px;
	}
	.smallArticle .rightImage,.bigArticle .rightImage{
		float:right;
	}
	.smallArticle{
		width:274px;		
	}
	.bigArticle{
		width:564px;
	}
	.clear{
		clear:both;
	}
	
	#rectangle{
		float:left;
		border:1px dotted #F00;
		background-color:#FFF;
	}
	#insertionMarker{
		width:6px;
		position:absolute;
		display:none;
	}
	#insertionMarker img{
		float:left;
	}		
	#dragDropMoveLayer{	
		position:absolute;
		display:none;
		border:1px solid #000;
		filter:alpha(opacity=50);
		opacity:0.5;
	}

</style>
	
	<script type="text/javascript">
	var rectangleBorderWidth = 2;	
	var useRectangle = false;	
	var autoScrollSpeed = 4;	
	function saveData()
	{
		var saveString = "";
		for(var no=0;no<dragableObjectArray.length;no++){
			if(saveString.length>0)saveString = saveString + ';';
			ref = dragableObjectArray[no];
			saveString = saveString + ref['obj'].id;
		}	
		
		alert(saveString);	
	}
	var dragableElementsParentBox;
	var opera = navigator.appVersion.indexOf('Opera')>=0?true:false;
	var rectangleDiv = false;
	var insertionMarkerDiv = false;
	var mouse_x;
	var mouse_y;
	
	var el_x;
	var el_y;
	var dragDropTimer = -1;
	var dragObject = false;
	var dragObjectNextObj = false;
	var dragableObjectArray = new Array();
	var destinationObj = false;	
	var currentDest = false;
	var allowRectangleMove = true;
	var insertionMarkerLine;
	var dragDropMoveLayer;
	var autoScrollActive = false;
	var documentHeight = false;
	var documentScrollHeight = false;
	var dragableAreaWidth = false;
	function getTopPos(inputObj)
	{		
	  var returnValue = inputObj.offsetTop;
	  while((inputObj = inputObj.offsetParent) != null){
	  	if(inputObj.tagName!='HTML')returnValue += inputObj.offsetTop;
	  }
	  return returnValue;
	}
	
	function getLeftPos(inputObj)
	{
	  var returnValue = inputObj.offsetLeft;
	  while((inputObj = inputObj.offsetParent) != null){
	  if(inputObj.tagName!='HTML')returnValue += inputObj.offsetLeft;
	  }
	  return returnValue;
	}
		
	function cancelSelectionEvent()
	{
		if(dragDropTimer>=0)return false;
		return true;
	}
	
	function getObjectFromPosition(x,y)
	{
		var height = dragObject.offsetHeight;
		var width = dragObject.offsetWidth;
		var indexCurrentDragObject=-5;
		for(var no=0;no<dragableObjectArray.length;no++){			
			ref = dragableObjectArray[no];			
			if(ref['obj']==dragObject)indexCurrentDragObject=no;
			if(no<dragableObjectArray.length-1 && dragableObjectArray[no+1]['obj']==dragObject)indexCurrentDragObject=no+1;
			if(ref['obj']==dragObject && useRectangle)continue;	
			if(x > ref['left'] && y>ref['top'] && x<(ref['left'] + (ref['width']/2)) && y<(ref['top'] + ref['height'])){
				if(!useRectangle && dragableObjectArray[no]['obj']==dragObject)return 'self';
				if(indexCurrentDragObject==(no-1))return 'self';
				return Array(dragableObjectArray[no],no);
			}
			
			if(x > (ref['left'] + (ref['width']/2)) && y>ref['top'] && x<(ref['left'] + ref['width']) && y<(ref['top'] + ref['height'])){
				if(no<dragableObjectArray.length-1){
					if(no==indexCurrentDragObject || (no==indexCurrentDragObject-1)){
						return 'self';
					}
					if(dragableObjectArray[no]['obj']!=dragObject){
						return Array(dragableObjectArray[no+1],no+1);
					}else{
						if(!useRectangle)return 'self';
						if(no<dragableObjectArray.length-2)return Array(dragableObjectArray[no+2],no+2);
					}
				}else{
					if(dragableObjectArray[dragableObjectArray.length-1]['obj']!=dragObject)return 'append';	
					
				}
			}
			if(no<dragableObjectArray.length-1){
				if(x > (ref['left'] + ref['width']) && y>ref['top'] && y<(ref['top'] + ref['height']) && y<dragableObjectArray[no+1]['top']){
					return Array(dragableObjectArray[no+1],no+1);
				}
			}
		}	
		if(x>ref['left'] && y>(ref['top'] + ref['height']))return 'append';				
		return false;	
	}
		
	function initDrag(e)
	{
		if(document.all)e = event;
		mouse_x = e.clientX;
		mouse_y = e.clientY;
		if(!documentScrollHeight)documentScrollHeight = document.documentElement.scrollHeight + 100;
		el_x = getLeftPos(this)/1;
		el_y = getTopPos(this)/1;
		dragObject = this;
		if(useRectangle){
			rectangleDiv.style.width = this.clientWidth - (rectangleBorderWidth*2) +'px';
			rectangleDiv.style.height = this.clientHeight - (rectangleBorderWidth*2) +'px';
			rectangleDiv.className = this.className;
		}else{
			insertionMarkerLine.style.width = '6px';
		}
		dragDropTimer = 0;
		dragObjectNextObj = false;
		if(this.nextSibling){
			dragObjectNextObj = this.nextSibling;
			if(!dragObjectNextObj.tagName)dragObjectNextObj = dragObjectNextObj.nextSibling;
		}
		initDragTimer();
		return false;
	}
	
	function initDragTimer()
	{
		if(dragDropTimer>=0 && dragDropTimer<10){
			dragDropTimer++;
			setTimeout('initDragTimer()',5);
			return;
		}
		if(dragDropTimer==10){
			
			if(useRectangle){
				dragObject.style.opacity = 0.5;
				dragObject.style.filter = 'alpha(opacity=50)';
				dragObject.style.cursor = 'default';
			}else{
				var newObject = dragObject.cloneNode(true);
				dragDropMoveLayer.appendChild(newObject);
			}
		}
	}
	
	
	function autoScroll(direction,yPos)
	{
		if(document.documentElement.scrollHeight>documentScrollHeight && direction>0)return;
		
		window.scrollBy(0,direction);
		
		if(direction<0){
			if(document.documentElement.scrollTop>0){
				mouse_y = mouse_y - direction;
				if(useRectangle){
					dragObject.style.top = (el_y - mouse_y + yPos) + 'px';
				}else{
					dragDropMoveLayer.style.top = (el_y - mouse_y + yPos) + 'px';
				}			
			}else{
				autoScrollActive = false;
			}
		}else{
			if(yPos>(documentHeight-50)){

mouse_y = mouse_y - direction;
				if(useRectangle){
					dragObject.style.top = (el_y - mouse_y + yPos) + 'px';
				}else{
					dragDropMoveLayer.style.top = (el_y - mouse_y + yPos) + 'px';
				}				
			}else{
				autoScrollActive = false;
			}
		}
		if(autoScrollActive)setTimeout('autoScroll('+direction+',' + yPos + ')',5);
	}
	
	function moveDragableElement(e)
	{
		if(document.all)e = event;

if(dragDropTimer<10)return;
		if(!allowRectangleMove)return false;
		
		
		if(e.clientY<50 || e.clientY>(documentHeight-50)){
			if(e.clientY<50 && !autoScrollActive){
				autoScrollActive = true;
				autoScroll((autoScrollSpeed*-1),e.clientY);
			}
			
			if(e.clientY>(documentHeight-50) && document.documentElement.scrollHeight<=documentScrollHeight && !autoScrollActive){
				autoScrollActive = true;
				autoScroll(autoScrollSpeed,e.clientY);
			}
		}else{
			autoScrollActive = false;
		}
		if(useRectangle){			
			if(dragObject.style.position!='absolute'){
				dragObject.style.position = 'absolute';
				setTimeout('repositionDragObjectArray()',50);
			}
		}		
	
		if(useRectangle){
			rectangleDiv.style.display='block';
		}else{
			insertionMarkerDiv.style.display='block';	
			dragDropMoveLayer.style.display='block';	
		}
		
		if(useRectangle){
			dragObject.style.left = (el_x - mouse_x + e.clientX + Math.max(document.body.scrollLeft,document.documentElement.scrollLeft)) + 'px';
			dragObject.style.top = (el_y - mouse_y + e.clientY) + 'px';
		}else{
			dragDropMoveLayer.style.left = (el_x - mouse_x + e.clientX + Math.max(document.body.scrollLeft,document.documentElement.scrollLeft)) + 'px';
			dragDropMoveLayer.style.top = (el_y - mouse_y + e.clientY) + 'px';
		}
		dest = getObjectFromPosition(e.clientX+Math.max(document.body.scrollLeft,document.documentElement.scrollLeft),e.clientY+Math.max(document.body.scrollTop,document.documentElement.scrollTop));
		
		if(dest!==false && dest!='append' && dest!='self'){
			destinationObj = dest[0]; 
			
			if(currentDest!==destinationObj){
				currentDest = destinationObj;
				if(useRectangle){
					destinationObj['obj'].parentNode.insertBefore(rectangleDiv,destinationObj['obj']);
					repositionDragObjectArray();
	}else{
if(dest[1]>0 && (dragableObjectArray[dest[1]-1]['obj'].offsetLeft + dragableObjectArray[dest[1]-1]['width'] + dragObject.offsetWidth) < dragableAreaWidth){
			insertionMarkerDiv.style.left = (getLeftPos(dragableObjectArray[dest[1]-1]['obj']) + dragableObjectArray[dest[1]-1]['width'] + 2) + 'px';
insertionMarkerDiv.style.top = (getTopPos(dragableObjectArray[dest[1]-1]['obj']) - 2) + 'px';
insertionMarkerLine.style.height = dragableObjectArray[dest[1]-1]['height'] + 'px';
	}else{					
insertionMarkerDiv.style.left = (getLeftPos(destinationObj['obj']) - 8) + 'px';
insertionMarkerDiv.style.top = (getTopPos(destinationObj['obj']) - 2) + 'px';
insertionMarkerLine.style.height = destinationObj['height'] + 'px';
					}
					
					
				}
			}
		}
		
		if(dest=='self' || !dest){
			insertionMarkerDiv.style.display='none';
			destinationObj = dest;	
		}
		
		if(dest=='append'){
			if(useRectangle){
				dragableElementsParentBox.appendChild(rectangleDiv);
				dragableElementsParentBox.appendChild(document.getElementById('clear'));
			}else{
				var tmpRef = dragableObjectArray[dragableObjectArray.length-1];
				insertionMarkerDiv.style.left = (getLeftPos(tmpRef['obj']) + 2) + tmpRef['width'] + 'px';
				insertionMarkerDiv.style.top = (getTopPos(tmpRef['obj']) - 2) + 'px';
				insertionMarkerLine.style.height = tmpRef['height'] + 'px';	
			}
			destinationObj = dest;
			repositionDragObjectArray();
		}	
		
		if(useRectangle && !dest){
			destinationObj = currentDest;
		}
		
		allowRectangleMove = false;
		setTimeout('allowRectangleMove=true',50);
	}
	
	function stop_dragDropElement()
	{
		dragDropTimer = -1;
		
		if(destinationObj && destinationObj!='append' && destinationObj!='self'){
			destinationObj['obj'].parentNode.insertBefore(dragObject,destinationObj['obj']);
		}
		if(destinationObj=='append'){
			dragableElementsParentBox.appendChild(dragObject);
			dragableElementsParentBox.appendChild(document.getElementById('clear'));
		}
		  
		if(dragObject && useRectangle){
			dragObject.style.opacity = 1;
			dragObject.style.filter = 'alpha(opacity=100)';
			dragObject.style.cursor = 'move';
			dragObject.style.position='static';
		}
		rectangleDiv.style.display='none';
		insertionMarkerDiv.style.display='none';
		dragObject = false;
		currentDest = false;
		resetObjectArray();
		destinationObj = false;
		if(dragDropMoveLayer){
			dragDropMoveLayer.style.display='none';
			dragDropMoveLayer.innerHTML='';
		}
		autoScrollActive = false;
		documentScrollHeight = document.documentElement.scrollHeight + 100;
	}
	
	function cancelEvent()
	{
		return false;
	}
	
	function repositionDragObjectArray()
	{
		for(var no=0;no<dragableObjectArray.length;no++){
			ref = dragableObjectArray[no];
			ref['left'] = getLeftPos(ref['obj']);
			ref['top'] = getTopPos(ref['obj']);			
		}	
		documentScrollHeight = document.documentElement.scrollHeight + 100;
		documentHeight = document.documentElement.clientHeight;
	}
	
	function resetObjectArray()
	{
		dragableObjectArray.length=0;
		var subDivs = dragableElementsParentBox.getElementsByTagName('*');
		var countEl = 0;

for(var no=0;no<subDivs.length;no++){
			var attr = subDivs[no].getAttribute('dragableBox');
			if(opera)attr = subDivs[no].dragableBox;
			if(attr=='true'){
				var index = dragableObjectArray.length;
				dragableObjectArray[index] = new Array();
				ref = dragableObjectArray[index];
				ref['obj'] = subDivs[no];
				ref['width'] = subDivs[no].offsetWidth;
				ref['height'] = subDivs[no].offsetHeight;
				ref['left'] = getLeftPos(subDivs[no]);
				ref['top'] = getTopPos(subDivs[no]);
				ref['index'] = countEl;
				countEl++;
			}
		}	
	}

<div id="mainContainer">
	
	<div id="dragableElementsParentBox">
		<div class="bigArticle" dragableBox="true" id="article1">
			<h4>Heading 1</h4>
			<p>Splendida porro oculi fugitant  www.mb5u.com vitantque tueri. sol etiam caecat, contra si tendere pergas,propterea quia vis magnast ipsius et altea?ra per purum simulacra ferunturet feriunt oculos turbantia composituras.</p>
		</div>
		<div class="smallArticle" dragableBox="true" id="article2">
			<h4>Heading 2</h4>
			<p>Splendida porro oculi fugitant vitantque tueri. sol etiam caecat, contra si tendere pergas,propterea quia vis magnast.</p>
		</div>
		<div class="smallArticle" dragableBox="true" id="article3">
			<h4>Heading 3</h4>
			<p>Splendida porro oculi fugitant vitantque tueri. sol etiam caecat, contra si tendere pergas,propterea quia vis magnast.</p>
		</div>
		<div class="bigArticle" dragableBox="true" id="article4">
			<h4>Heading 4</h4>
			<p> www.mb5u.com Splendida porro oculi fugitant vitantque tueri. sol etiam caecat, contra si tendere pergas,propterea quia vis magnast ipsius et altea?ra per purum simulacra ferunturet feriunt oculos turbantia composituras.</p>
		</div>		
		<div class="smallArticle" dragableBox="true" id="article5">
			<h4>Heading 5</h4>
			<p>Splendida porro oculi fugitant vitantque tueri. sol etiam caecat, contra si tendere pergas,propterea quia vis magnast.</p>
		</div>
		<div class="smallArticle" dragableBox="true" id="article6">
			<h4>Heading 6</h4>
			<p>Splendida porro oculi fugitant vitantque tueri. sol etiam caecat,  www.mb5u.com contra si tendere pergas,propterea quia vis magnast.</p>
		</div>
		<div class="bigArticle" dragableBox="true" id="article7">
			<h4>Heading 7</h4>
			<p>Splendida porro oculi fugitant vitantque tueri. sol etiam caecat, contra si tendere pergas,propterea quia vis magnast ipsius et altea?ra per purum simulacra ferunturet feriunt oculos turbantia composituras.</p>
		</div>	
		<div class="bigArticle" dragableBox="true" id="article8">

<h4>Heading 8</h4>
			<p>Splendida porro oculi fugitant vitantque tueri. sol etiam caecat, contra si tendere pergas,propterea quia vis magnast ipsius et altea?ra per purum simulacra ferunturet feriunt oculos turbantia composituras.</p>
		</div>	
		<div class="bigArticle" dragableBox="true" id="article9">
			<h4>Heading 9</h4>
			<p>Splendida porro oculi fugitant vitantque tueri. sol etiam caecat, contra si tendere pergas,propterea quia vis magnast ipsius et altea?ra per purum simulacra ferunturet feriunt oculos turbantia composituras.</p>
		</div>					
		<div class="clear" id="clear"></div>		
	</div>
	
	<input type="button" value="Save" onclick="saveData()">
</div>

<div id="insertionMarker">
	<img src="/jscss/demoimg/200906/marker_top.gif">
	<img src="/jscss/demoimg/200906/marker_middle.gif" id="insertionMarkerLine">
	<img src="/jscss/demoimg/200906/marker_bottom.gif">
</div>

</head>
<body>
</body>
</html>

所属频道：层和布局特效/更新时间：2012-11-21

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