js实现拖拽框

浏览数：70 / 时间：2015年06月09日

纯js版的拖拽框，该效果很简单直接看代码.....

<!doctype html>
<html>
	<head>
		<meta charset="urf-8"/>
		<style>
			#box{
				border:1px solid #ccc;
				position:absolute;
				border-radius:4px;
				border-shadow:10px 10px 5px #888888;
			}
			#box h1{
				margin:0;
				padding:3px;
				background:#141414;
				color:#fff;
				height:32px;
				line-height:32px;
				text-align:center;
				font-size:12px;
				cursor:move;
			}
		</style>
		
	</head>
	<body>
	<input id="xy_text" style="margin:30px;width:400px;height:30px;line-height:30px;font-size:22px;"/>
		<div id="box" style="width:480px;height:200px;">  <!-- 此处需要行内样式，否则使用 document.getElementById('box').style.width 获取不到值使用jq就可以 -->
			<h1 id="title">标题</h1>
		</div>
		
		<script type="text/javascript">
			function $(id){
				return document.getElementById(id);
			}
			window.onload = init;
			
			function getHeight(){
				return window.innerHeight || document.documentElement && document.documentElement.clientHeight ||
					document.body.clientHeight;
			}
			
			function getWidth(){
				return window.innerWidth || document.documentElement && document.documentElement.clientWidth ||
				   document.body.clientWidth;
			}
			
			function init(){
				//鼠标按下去
				var titleDom = $('title');
				titleDom.onmousedown = mousedown; 
				document.onmousemove = mousemove;
				document.onmouseout = mouseup;
				document.onmouseup = mouseup;
				var boxDom = $('box');
				var width = parseInt(boxDom.style.width);
				var height = parseInt(boxDom.style.height);
				var bodyWidth = getWidth();
				var bodyHeight = getHeight();
				boxDom.style.top = (bodyHeight - height)/2 + 'px';
				boxDom.style.left = (bodyWidth - width)/2 + 'px';
			}
			var t = 0, l = 0 , x = 0 , y = 0 ,isover = false;
			
			function mousedown(event){
				var e = event || window.event;
				x = e.clientX;
				y = e.clientY;
				var boxDom = $('box');
				l = parseInt(boxDom.style.left);
				t = parseInt(boxDom.style.top);
				isover = true;
			}
			
			function mousemove(event){
				if(isover){
					var e = event || window.event;
					var newLeft = l + e.clientX - x;
					var newTop = t + e.clientY - y;
					$('xy_text').value = 'newLeft = '+newLeft + ' , newTop = '+newTop;
					var boxDom = $('box');
					if(newTop <= 0)newTop=0;
					if(newLeft <= 0)newLeft=0;
					var maxLeft = getWidth() - parseInt(boxDom.style.width);
					var maxTop = getHeight() - parseInt(boxDom.style.height);
					if(newLeft >= maxLeft)newLeft=maxLeft;
					if(newTop >= maxTop)newTop=maxTop;
					boxDom.style.top = newTop+'px';
					boxDom.style.left = newLeft+'px';
				}
			}
			
			function mouseup(event){
				if(isover){
					isover = false;
					$('xy_text').value = isover;
				}
			}
		</script>
	</body>
</html>

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js实现拖拽框