纯生JS图片拖拽

发布时间：2016-01-07, 16:22:44 分类：HTML | 编辑 off 网址 | 辅助

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纯生JS图片拖拽
html

<!DOCTYPE html>
<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<title>RunJS</title>
	</head>
	<body>
			<div id="div1"></div>
    <img src="http://sandbox.runjs.cn/uploads/rs/198/kn8pai72/index_29.jpg" id="img1" />
	</body>
</html>

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css

#div1 {width: 100px; height: 100px; background: red; position: absolute;}
#img1 { position: absolute;}

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window.onload = function() {
	
	var oDiv = document.getElementById('div1');
	var oImg = document.getElementById('img1');
	
	drag(oImg);
	
	drag(oDiv);
	
	function drag(obj) {
		
		obj.onmousedown = function(ev) {
			var ev = ev || event;
			
			var disX = ev.clientX - this.offsetLeft;
			var disY = ev.clientY - this.offsetTop;
			
			
			
			document.onmousemove = function(ev) {
				var ev = ev || event;
				
				obj.style.left = ev.clientX - disX + 'px';
				obj.style.top = ev.clientY - disY + 'px';
			}
			
			document.onmouseup = function() {
				document.onmousemove = document.onmouseup = null;
				
			}
			
			return false;
			
		}
		
	}
	
}

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原文 http://runjs.cn/detail/nivygth7

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js如何给标签添加一个自定义属性

可以用setAttribute来设定
var img = document.getElementsByTagName("img")[0];
img.setAttribute("zidingyi","bcd");

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用js给一个DIV一个ID 添加ID

var div = document.getElementsByTagName("div")[0];
div.setAttribute("id","yourdiv");

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简单拖曵原理实例

<!DOCTYPE html>
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>简单拖曵原理实例</title>
    <style type="text/css">
        #drag{width:400px;height:300px;background:url(http://upload.yxgz.cn/uploadfile/2009/0513/20090513052611873.jpg);cursor:move;position:absolute;top:100px;left:100px;border:solid 1px #ccc;}
        h2{color:#fff;background: none repeat scroll 0 0 rgba(16, 90, 31, 0.7);color:#FFFFFF;height:40px;line-height:40px;margin:0;}
    </style>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function(){
            /*--------------拖曳效果----------------
            *原理：标记拖曳状态dragging ,坐标位置iX, iY
            *         mousedown:fn(){dragging = true, 记录起始坐标位置，设置鼠标捕获}
            *         mouseover:fn(){判断如果dragging = true, 则当前坐标位置 - 记录起始坐标位置，绝对定位的元素获得差值}
            *         mouseup:fn(){dragging = false, 释放鼠标捕获，防止冒泡}
            */
            var dragging = false;
            var iX, iY;
            $("#drag").mousedown(function(e) {
                dragging = true;
                iX = e.clientX - this.offsetLeft;
                iY = e.clientY - this.offsetTop;
                this.setCapture && this.setCapture();
                return false;
            });
            document.onmousemove = function(e) {
                if (dragging) {
                var e = e || window.event;
                var oX = e.clientX - iX;
                var oY = e.clientY - iY;
                $("#drag").css({"left":oX + "px", "top":oY + "px"});
                return false;
                }
            };
            $(document).mouseup(function(e) {
                dragging = false;
                $("#drag")[0].releaseCapture();
                e.cancelBubble = true;
            })
 
        })
 
    </script>
</head>
 
<body>
    <div id="drag">
        <h2>来拖动我啊</h2>
    </div>
</body>
</html>

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js如何禁用鼠标右键

function stop(){
   return false;
  }
  document.oncontextmenu=stop;

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