练习案例_可拖动的div层

 

<!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>可拖动的div层</title>
    <style type="text/css">
        .draggable-div{
            position: absolute;
            width: 300px;
            height:185px;
            background-color: lightgray;
        }
    </style>
    <script type="text/javascript" src="jquery-1.8.3.js"></script>
    <script type="text/javascript">

        var draggable = false;
        var offsetX = 0;//按下鼠标按键的时候，当前鼠标的x坐标和div左上角定点的x坐标的差值
        var offsetY = 0;

        $(document).ready(function(){
            $("#draggableDiv").css("position","absolute").mousedown(function () {
                draggable = true;
                offsetX = event.clientX-this.offsetLeft;
                offsetY = event.clientY-this.offsetTop;
            }).mouseup(function () {
                draggable = false;
            }).mousemove(function () {
                //如果draggable为true,改变div的位置
                if(draggable){
                    this.style.left = event.clientX-offsetX+"px";
                    this.style.top = event.clientY-offsetY+"px";
                }
            }).mouseout(function(){
                draggable=false;
            });

        });
    </script>
</head>
<body>
<div id="draggableDiv" class="draggable-div"></div>
</body>
</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></title>
    <script type="text/javascript">

        var draggable = false;

        //鼠标指针y坐标的减去div左上角顶点y坐标
        var offsetY = 0;
        var offsetX = 0;

        window.onload=function(){

            var div01 = document.getElementById("div01");

            div01.style.position = "absolute";

            div01.onmousedown=function(){
                draggable = true;
                offsetY = event.clientY - div01.offsetTop;
                offsetX = event.clientX - div01.offsetLeft;

            }

            div01.onmouseup=function(){
                draggable=false;
            }

            div01.onmousemove=function(){
                if(draggable){
                    //拖动
                    this.style.left = event.clientX-offsetX+"px";
                    this.style.top  = event.clientY - offsetY+"px";

                }
            }

            div01.onmouseout=function(){
                draggable = false;
            }

        }

    </script>
</head>
<body>
    <div id="div01" style="width: 300px;height: 185px;background-color: lightgray"></div>
</body>
</html>

 

posted @ 2016-06-09 17:45  linyongqin  阅读(126)  评论(0)    收藏  举报