• 弹出框限制拖动范围

    html

    <div id="showd" style="display: block;">
            <div class="cy_op"></div>
            <div id="replace" class="tuo">
                <div class="box hbox">
                    <span>替换数据库字符串</span>
                    <a href="javascript:">X</a>
                </div>
                <div class="box bbox">
                    <table>
                        <tbody><tr>
                            <td>原来的字符串</td>
                            <td><input type="" name="oldstr" value=""></td>
                        </tr>
                        <tr>
                            <td>替换为</td>
                            <td><input type="" name="newstr" value=""></td>
                        </tr>
                    </tbody></table>
                </div>
                <div class="box fbox">
                    <button class="but-green-90 confirm">确定</button>
                    <button class="but-yellow-90 cancel">取消</button>
                </div>
            </div>        
        </div>

    css

    #showd{
    display:none;
}
#replace{
    position:absolute;
     left:50%;
    top:50%;
    transform: translate(-50%,-50%); 
    width:360px;
    background-color:#fff;
    border:1px solid #ddd;
    border-radius: 4px;
    z-index: 999
}

#showd .cy_op{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #333333;
    opacity: 0.4;
    z-index: 999;
}
#replace .box{
    background-color:#fff;
}
#replace .hbox>a{
    float: right;
     padding-right: 15px;
}
#replace .hbox{
    background-color:#00aea4;
    height:35px;
    text-align: left;
    line-height: 35px;
    padding-left:20px;
    font-size:16px;
    color:#fff;
    border-bottom:1px solid #e3e3e3;
    cursor:move
}
#replace .bbox{
    margin:13px auto;
    text-align:center;
}
#replace .bbox table{
    height:65px;
}
#replace .fbox{
    text-align:center;
    padding:5px;
    border-top:1px solid #00aea4;
}
#replace .fbox button+button{
    margin-left:10px;
}

    js

        //字符串替换窗口的拖动事件
    var oDiv = document.getElementById('replace');
    oDiv.getElementsByClassName("hbox")[0].onmousedown = function(ev) {
        var ev = ev || event;
        var distanceX = ev.clientX - oDiv.offsetLeft;//鼠标相对于目标元素的x位置
        var distanceY = ev.clientY - oDiv.offsetTop;
        document.onmousemove=function(ev){
            var dialogRight,dialogBottom,maxTop,maxLeft;
            var ev = ev || event;
            var l=ev.clientX - distanceX;
            var t= ev.clientY - distanceY;
            if(l- oDiv.offsetWidth/2<0){
                l=0+ oDiv.offsetWidth/2//因为transform偏移了50%
            }
            console.log(l- oDiv.offsetWidth/2);
            if(t- oDiv.offsetHeight/2<0){
                t=0+ oDiv.offsetHeight/2
            }
            oDiv.style.left = l+ 'px';
            oDiv.style.top = t+ 'px';
            //判断是否超出窗体
            //计算出弹出层距离右边的位置(窗口的宽度-目标元素的left宽度-目标元素的宽度)
            dialogRight=window.innerWidth-l-oDiv.offsetWidth;
            dialogBottom=window.innerHeight-t-oDiv.offsetHeight;
            //console.log("dialogRight为："+dialogRight);
            //console.log("dialogBottom为："+dialogBottom);
            //计算出最大的left和最大的top：
            maxTop= window.innerHeight-oDiv.offsetHeight;
            maxLeft=window.innerWidth-oDiv.offsetWidth;
            //console.log("maxTop为："+maxTop);
            //console.log("maxLeft为："+maxLeft);
            if(dialogRight+oDiv.offsetWidth/2<0){
                oDiv.style.left = maxLeft +oDiv.offsetWidth/2+ 'px';//因为样式有偏移50%
            }
            if(dialogBottom+ oDiv.offsetHeight/2<0){
                oDiv.style.top = maxTop + oDiv.offsetHeight/2+'px';
            }
        }
        document.onmouseup=function(ev){
            document.onmousemove = document.onmouseup = null;//清除
        }
    }

    效果

    test代码：

    <!doctype html>
<html lang="en">
 <head>
  <meta charset="UTF-8">
  <meta name="Generator" content="EditPlus®">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
  <title>Document</title>
  <style type="text/css">

#showd{
    display:none;
}
#replace{
    position:absolute;
     left:50%;
    top:50%;
    transform: translate(-50%,-50%); 
    width:360px;
    background-color:#fff;
    border:1px solid #ddd;
    border-radius: 4px;
    z-index: 999
}

#showd .cy_op{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #333333;
    opacity: 0.4;
    z-index: 999;
}
#replace .box{
    background-color:#fff;
}
#replace .hbox>a{
    float: right;
     padding-right: 15px;
}
#replace .hbox{
    background-color:#00aea4;
    height:35px;
    text-align: left;
    line-height: 35px;
    padding-left:20px;
    font-size:16px;
    color:#fff;
    border-bottom:1px solid #e3e3e3;
    cursor:move
}
#replace .bbox{
    margin:13px auto;
    text-align:center;
}
#replace .bbox table{
    height:65px;
}
#replace .fbox{
    text-align:center;
    padding:5px;
    border-top:1px solid #00aea4;
}
#replace .fbox button+button{
    margin-left:10px;
}
  </style>
 </head>
 <body>
  <div id="showd" style="display: block;">
            <div class="cy_op"></div>
            <div id="replace" class="tuo">
                <div class="box hbox">
                    <span>替换数据库字符串</span>
                    <a href="javascript:">X</a>
                </div>
                <div class="box bbox">
                    <table>
                        <tbody><tr>
                            <td>原来的字符串</td>
                            <td><input type="" name="oldstr" value=""></td>
                        </tr>
                        <tr>
                            <td>替换为</td>
                            <td><input type="" name="newstr" value=""></td>
                        </tr>
                    </tbody></table>
                </div>
                <div class="box fbox">
                    <button class="but-green-90 confirm">确定</button>
                    <button class="but-yellow-90 cancel">取消</button>
                </div>
            </div>        
        </div>
        <script type="text/javascript">
        window.onload=function(){
        //字符串替换窗口的拖动事件
    var oDiv = document.getElementById('replace');
    oDiv.getElementsByClassName("hbox")[0].onmousedown = function(ev) {
        var ev = ev || event;
        var distanceX = ev.clientX - oDiv.offsetLeft;//鼠标相对于目标元素的x位置
        var distanceY = ev.clientY - oDiv.offsetTop;
        document.onmousemove=function(ev){
            var dialogRight,dialogBottom,maxTop,maxLeft;
            var ev = ev || event;
            var l=ev.clientX - distanceX;
            var t= ev.clientY - distanceY;
            if(l- oDiv.offsetWidth/2<0){
                l=0+ oDiv.offsetWidth/2//因为transform偏移了50%
            }
            console.log(l- oDiv.offsetWidth/2);
            if(t- oDiv.offsetHeight/2<0){
                t=0+ oDiv.offsetHeight/2
            }
            oDiv.style.left = l+ 'px';
            oDiv.style.top = t+ 'px';
            //判断是否超出窗体
            //计算出弹出层距离右边的位置(窗口的宽度-目标元素的left宽度-目标元素的宽度)
            dialogRight=window.innerWidth-l-oDiv.offsetWidth;
            dialogBottom=window.innerHeight-t-oDiv.offsetHeight;
            //console.log("dialogRight为："+dialogRight);
            //console.log("dialogBottom为："+dialogBottom);
            //计算出最大的left和最大的top：
            maxTop= window.innerHeight-oDiv.offsetHeight;
            maxLeft=window.innerWidth-oDiv.offsetWidth;
            //console.log("maxTop为："+maxTop);
            //console.log("maxLeft为："+maxLeft);
            if(dialogRight+oDiv.offsetWidth/2<0){
                oDiv.style.left = maxLeft +oDiv.offsetWidth/2+ 'px';//因为样式有偏移50%
            }
            if(dialogBottom+ oDiv.offsetHeight/2<0){
                oDiv.style.top = maxTop + oDiv.offsetHeight/2+'px';
            }
        }
        document.onmouseup=function(ev){
            document.onmousemove = document.onmouseup = null;//清除
        }
    }
        }
        </script>
 </body>
</html>
    View Code

    网上github看到的项目：（2019年12月6号）

    也可以自由拖动div

    代码：

    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>慕课网-拖拽效果</title>

    <style type="text/css">

        body {
            background: url(images/baidu_demo.png) #fff top center no-repeat;
            padding: 0px;
            margin: 0px;
            font-size: 12px;
            font-family: "微软雅黑";
        }

        .link {
            text-align: right;
            line-height: 20px;
            padding-right: 40px;
        }

        .ui-dialog {
            width: 380px;
            height: auto;
            display: none;
            position: absolute;
            z-index: 9000;
            top: 0px;
            left: 0px;
            border: 1px solid #D5D5D5;
            background: #fff;
        }

        .ui-dialog a {
            text-decoration: none;
        }

        .ui-dialog-title {
            height: 48px;
            line-height: 48px;
            padding: 0px 20px;
            color: #535353;
            font-size: 16px;
            border-bottom: 1px solid #efefef;
            background: #f5f5f5;
            cursor: move;
            user-select: none;
        }

        .ui-dialog-closebutton {
            width: 16px;
            height: 16px;
            display: block;
            position: absolute;
            top: 12px;
            right: 20px;
            background: url(images/close_def.png) no-repeat;
            cursor: pointer;

        }

        .ui-dialog-closebutton:hover {
            background: url(images/close_hov.png);
        }

        .ui-dialog-content {
            padding: 15px 20px;
        }

        .ui-dialog-pt15 {
            padding-top: 15px;
        }

        .ui-dialog-l40 {
            height: 40px;
            line-height: 40px;
            text-align: right;
        }

        .ui-dialog-input {
            width: 100%;
            height: 40px;
            margin: 0px;
            padding: 0px;
            border: 1px solid #d5d5d5;
            font-size: 16px;
            color: #c1c1c1;
            text-indent: 25px;
            outline: none;
        }

        .ui-dialog-input-username {
            background: url(images/input_username.png) no-repeat 2px;
        }

        .ui-dialog-input-password {
            background: url(images/input_password.png) no-repeat 2px;
        }

        .ui-dialog-submit {
            width: 100%;
            height: 50px;
            background: #3b7ae3;
            border: none;
            font-size: 16px;
            color: #fff;
            outline: none;
            text-decoration: none;
            display: block;
            text-align: center;
            line-height: 50px;
        }

        .ui-dialog-submit:hover {
            background: #3f81b0;
        }

        .ui-mask {
            width: 100%;
            height: 100%;
            background: #000;
            position: absolute;
            top: 0px;
            height: 0px;
            z-index: 8000;
            opacity: 0.4;
            filter: Alpha(opacity=40);
        }
    </style>
</head>
<body>
<div class="link">
    <a href="javascript:showDialog();">登录</a>
</div>
<div class="ui-mask" id="mask" onselectstart="return false"></div>

<div class="ui-dialog" id="dialog" onselectstart='return false;'>
    <div class="ui-dialog-title" id="dialogTitle" onselectstart="return false;">

        登录通行证

        <a class="ui-dialog-closebutton" href="javascript:hideDialog();"></a>

    </div>
    <div class="ui-dialog-content">
        <div class="ui-dialog-l40 ui-dialog-pt15">
            <input class="ui-dialog-input ui-dialog-input-username" type="input" value="手机/邮箱/用户名"/>
        </div>
        <div class="ui-dialog-l40 ui-dialog-pt15">
            <input class="ui-dialog-input ui-dialog-input-password" type="input" value="密码"/>
        </div>
        <div class="ui-dialog-l40">
            <a href="#">忘记密码</a>
        </div>
        <div>
            <a class="ui-dialog-submit" href="#">登录</a>
        </div>
        <div class="ui-dialog-l40">
            <a href="#">立即注册</a>
        </div>
    </div>
</div>
<script type="text/javascript">
    //获取元素对象
    function g(id) {
        return document.getElementById(id);
    }

    //自动居中元素（el = Element）
    function autoCenter(el) {
        var bodyW = document.documentElement.clientWidth;
        var bodyH = document.documentElement.clientHeight;

        var elW = el.offsetWidth;
        var elH = el.offsetHeight;

        el.style.left = (bodyW - elW) / 2 + 'px';
        el.style.top = (bodyH - elH) / 2 + 'px';

    }

    //自动扩展元素到全部显示区域
    function fillToBody(el) {
        el.style.width = document.documentElement.clientWidth + 'px';
        el.style.height = document.documentElement.clientHeight + 'px';
    }

    var mouseOffsetX = 0;       //偏移
    var mouseOffsetY = 0;

    var isDraging = false;

    //鼠标事件1：在标题栏上按下（要计算鼠标相对拖拽元素的左上角的坐标，并标记元素为可拖拽
    g('dialogTitle').addEventListener("mousedown", function (e) {
        var e = e || window.event;
        mouseOffsetX = e.pageX - g('dialog').offsetLeft;
        mouseOffsetY = e.pageY - g('dialog').offsetTop;
        isDraging = true;
    })

    //鼠标时间2：鼠标移动时（要检测，元素是否可以移动，如果可以改变位置
    document.onmousemove = function (e) {
        var e = e || window.event;
        var mouseX = e.pageX;
        var mouseY = e.pageY;

        var moveX = 0;
        var moveY = 0;

        if (isDraging == true) {
            moveX = mouseX - mouseOffsetX;
            moveY = mouseY - mouseOffsetY;

            var pageWith = document.documentElement.clientWidth;
            var pageHeight = document.documentElement.clientHeight;

            var dialogWith = g('dialog').offsetWidth;
            var dialogHeight = g('dialog').offsetHeight;

            var maxX = pageWith - dialogWith;
            var maxY = pageHeight - dialogHeight;

            moveX = Math.min(maxX, Math.max(0, moveX));
            moveY = Math.min(maxY, Math.max(0, moveY));

            g('dialog').style.left = moveX + 'px';
            g('dialog').style.top = moveY + 'px';
        }
    }

    //鼠标事件2：鼠标松开
    document.onmouseup = function () {
        isDraging = false;
    }

    //登陆按钮执行的操作
    function showDialog() {
        g('dialog').style.display = 'block';
        g('mask').style.display = 'block';
        autoCenter(g('dialog'));
        fillToBody(g('mask'));
    }

    //关闭按钮执行的操作
    function hideDialog() {
        g('dialog').style.display = 'none';
        g('mask').style.display = 'none';
    }

    //当页面大小变化是执行的操作
    window.onresize = function () {
        autoCenter(g('dialog'));
        fillToBody(g('mask'));
    }
</script>
</body>
</html>
    View Code

    如果直接打开可能找到不到图片，里面有一个image的文件夹 里面放了一些图片，但是也不是很影响效果，一些背景图片还有一些登录小图标，这里就不拷贝图片过来了
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  • 原文地址：https://www.cnblogs.com/pengfei25/p/10239546.html
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