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  • 【j2ee】div浮动层拖拽

    背景:近期项目中需要实现弹出浮层增加数据,并且浮动层可以拖拽

    解决步骤:1、浮动层实现  2、拖拽实现

    多方查资料,基本实现功能,现做demo,便于以后使用

    先上图片大体展示实现效果:


    再上代码,展示我的实现思路:

    DragAndDrop.html

    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>浮动层拖拽</title>
    <script src="DragDiv.js" type="text/javascript" language="javascript"
    	charset="UTF-8"></script>
    <link href="UploadFile.css" rel="stylesheet" type="text/css" />
    
    <script type="text/javascript">
    	function openFuCeng() {
    		document.getElementById("moveFile").style.display = "block";
    		document.getElementById("shadow2").style.display = "block";
    	
    	}
    	function closeDiv() {
    		document.getElementById("moveFile").style.display = "none";
    		document.getElementById("shadow2").style.display = "none";
    	
    	}
    </script>
    </head>
    <body>
    	<div id="dragAndDrop">
    	<!-- 浮层开始‹ -->
    		<div id="moveFile" class="moveFile">
    			<div class="toolbarHeight" onmousedown="down('moveFile')">
    					<label>鼠标拖拽可移动</label>
    			</div>
    			<div style="100%;height:85px; ">
    				<p>浮动层</p>
    			</div>
    			<div class="fucengDiv" >
    			<input class="toobarBtn" type="button" value="关闭" onclick="javascript:closeDiv()"/> 
    		</div>
    		</div>
    		<div id="shadow2"></div>
    		<!-- 浮层结束 -->
    		<div></div>
    		<input type="button" value="点击展示浮层" onclick="javascript:openFuCeng()" style="margin-top: 20px;">
    		<p>底层页面</p>
    	</div>
    </body>
    </html>

    DragDiv.js

    /**
     * 浮层拖拽
     */
    var px = 0;
    var py = 0;
    var begin = false;
    //是否要开启透明效果
    var enableOpacity = false; // 默认不允许
    var myDragDiv;
    /**
     * 浮层拖拽
     * @param divid 待拖拽对象id
     */
    function down(divid) {
    	myDragDiv=document.getElementById(divid);//获得被拖拽对象
        begin = true;
        myDragDiv.style.cursor = "hand";
        event.srcElement.setCapture();
        px = myDragDiv.style.pixelLeft - event.x;//pixelLeft
        py = myDragDiv.style.pixelTop - event.y;
    }
    
    document.onmousemove=function() {
        if (myDragDiv != null && typeof (myDragDiv) != "undefined") {
            if (begin&&(px + event.x)>10) {
                if (enableOpacity) { myDragDiv.style.filter = "Alpha(opacity=30)"; }  // 滤镜 
                myDragDiv.style.pixelLeft = px + event.x;
                myDragDiv.style.pixelTop = py + event.y;
            }
        }
    }
    
    document.onmouseup=function() {
        if (myDragDiv != null && typeof (myDragDiv) != "undefined") {
            begin = false;
            if (enableOpacity) { myDragDiv.style.filter = "Alpha(opacity=100)"; } // 滤镜 
            myDragDiv.style.cursor = "default";
            event.srcElement.releaseCapture();
            myDragDiv = null;
        }
    }


    UploadFile.css

    @CHARSET "UTF-8";
    #dragAndDrop{
    	margin: 0 auto;
    	 300px;
    	height: 200px;
    	margin-top:200px;
    	text-align:center;
    	background:#98fb98 ;
    	border: 2px solid black;
    }
    /*文件整体大小*/
    #shadow2{
    	display: none;
    	background:white; 
    	opacity:0.2; 
    	filter:alpha(opacity=20); 
    	position:absolute; 
    	left:0px; 
    	top:0px; 
    	100%; 
    	height:100%; 
    	z-index:996;/*z-index position display 共同实现层的浮动 */
    	margin: 0 auto;
    }
    /*移动浮层*/
    .moveFile{
    	display: none;
    	 150px;
    	height: 160px;
    	position: absolute;
    	z-index:997;
    	border: 2px solid black;
    	background:#FFF;
    	top:50%;
    	margin-top:-50px;
    	left:50%;
    	margin-left:-50px;
    }
    .toolbarHeight{
    	height: 25px;
    	 100%;
    	border-bottom:#b7e3f2 1px solid;
    	background:#98fb98 ;
    }
    .toobarBtn{
    	float: right; 
    	margin-right: 10px;
    }
    
    .fucengDiv{
    	100%;
    	height: 30px;
    	padding-top: 5px;
    	border-top:#b7e3f2 1px solid;
    }

    注:拖拽的实现是在网上查资料找到的,做了一些小的改动,大意了忘记留下学习地址了

    以上使用到的代码,看着还是比较简单的,但是你理解吗?至少我还是有问题的

    问题:

    首次拖拽总是不灵活,需要多晃动几次鼠标才有效,为什么呢?待解决

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  • 原文地址:https://www.cnblogs.com/dyllove98/p/3144758.html
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