鼠标拖拽

最新推荐文章于 2023-08-21 15:39:23 发布

weixin_30780221

最新推荐文章于 2023-08-21 15:39:23 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/theWayToAce/p/5305406.html

本文展示了如何使用HTML和JavaScript实现元素的拖拽功能，并通过改变元素的位置来达到定位的效果。具体包括了基本的div元素拖拽、拖拽吸附至容器边界以及拖拽时的边界限制等功能。

<!DOCTYPE HTML>
<html>
<head>
    <meta charset="utf-8">
    <title>无标题文档</title>
    <style>
#div1 {
width: 200px;
height: 200px;
background: red;
position: absolute;
        }
    </style>
    <script>
        window.onload = function () {
var oDiv = document.getElementById('div1');
var disX = 0;
var disY = 0;
oDiv.onmousedown = function (ev) {
var oEvent = ev || event;
disX = oEvent.clientX - oDiv.offsetLeft;
disY = oEvent.clientY - oDiv.offsetTop;
                document.onmousemove = function (ev) {
var oEvent = ev || event;
var l = oEvent.clientX - disX;
var t = oEvent.clientY - disY;
if (l < 0) {
l = 0;
                    }
else if (l > document.documentElement.clientWidth - oDiv.offsetWidth) {//可视区的宽度——div宽度
l = document.documentElement.clientWidth - oDiv.offsetWidth;
                    }
if (t < 0) {
t = 0;
                    }
else if (t > document.documentElement.clientHeight - oDiv.offsetHeight) {
t = document.documentElement.clientHeight - oDiv.offsetHeight;
                    }
oDiv.style.left = l + 'px';
oDiv.style.top = t + 'px';
                };
                document.onmouseup = function () {
                    document.onmousemove = null;
                    document.onmouseup = null;
                };
return false;
            };
        };
    </script>
</head>

<body>
<div id="div1"></div>
</body>
</html>

div拖拽带框：

<!DOCTYPE HTML>
<html>
<head>
    <meta charset="utf-8">
    <title>无标题文档</title>
    <style>
#div1 {
width: 100px;
height: 100px;
background: yellow;
position: absolute;
        }

        .box {
border: 1px dashed black;
position: absolute;
        }
    </style>
    <script>
        window.onload = function () {
var oDiv = document.getElementById('div1');

var disX = 0;
var disY = 0;

oDiv.onmousedown = function (ev) {
var oEvent = ev || event;

disX = oEvent.clientX - oDiv.offsetLeft;
disY = oEvent.clientY - oDiv.offsetTop;

var oBox = document.createElement('div');

oBox.className = 'box';
oBox.style.width = oDiv.offsetWidth - 2 + 'px';
oBox.style.height = oDiv.offsetHeight - 2 + 'px';

oBox.style.left = oDiv.offsetLeft + 'px';
oBox.style.top = oDiv.offsetTop + 'px';

                document.body.appendChild(oBox);

                document.onmousemove = function (ev) {
var oEvent = ev || event;
var l = oEvent.clientX - disX;
var t = oEvent.clientY - disY;

oBox.style.left = l + 'px';
oBox.style.top = t + 'px';
                };

                document.onmouseup = function () {
                    document.onmousemove = null;
                    document.onmouseup = null;

oDiv.style.left = oBox.offsetLeft + 'px';
oDiv.style.top = oBox.offsetTop + 'px';

                    document.body.removeChild(oBox);
                };

return false;  //chrome、ff、IE9
            };
        };
    </script>
</head>

<body>
<div id="div1"></div>
</body>
</html>

div拖拽吸附：

<!DOCTYPE HTML>
<html>
<head>
    <meta charset="utf-8">
    <title>无标题文档</title>
    <style>
#div1 {
width: 100px;
height: 100px;
background: red;
position: absolute;
        }

#div2 {
width: 700px;
height: 500px;
background: #CCC;
position: relative;
        }
    </style>
    <script>
        window.onload = function () {
var oDiv = document.getElementById('div1');
var oDiv2 = document.getElementById('div2');

var disX = 0;
var disY = 0;

oDiv.onmousedown = function (ev) {
var oEvent = ev || event;

disX = oEvent.clientX - oDiv.offsetLeft;
disY = oEvent.clientY - oDiv.offsetTop;

                document.onmousemove = function (ev) {
var oEvent = ev || event;
var l = oEvent.clientX - disX;
var t = oEvent.clientY - disY;

if (l < 50) {
l = 0;
                    } else if (l > 550) {
l = 600;
                    }
else if (l > oDiv2.offsetWidth - oDiv.offsetWidth) {
l = oDiv2.offsetWidth - oDiv.offsetWidth;
                    }

if (t < 50) {
t = 0;
                    } else if (t > 350) {
t = 400;
                    }
else if (t > oDiv2.offsetHeight - oDiv.offsetHeight) {
t = oDiv2.offsetHeight - oDiv.offsetHeight;
                    }

oDiv.style.left = l + 'px';
oDiv.style.top = t + 'px';
                };

                document.onmouseup = function () {
                    document.onmousemove = null;
                    document.onmouseup = null;
                };

return false;
            };
        };
    </script>
</head>

<body>
<div id="div2">
    <div id="div1"></div>
</div>
</body>
</html>