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HTML基础必学列表

如何实现登录框鼠标拖拽效果

 

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>登录框鼠标拖拽效果</title>

    <style type="text/css">

        body {

            background: url("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1488778794834&di=e97c96dfe7860297d1968c30adc862a2&imgtype=0&src=http%3A%2F%2Fpic1.5442.com%3A82%2F2015%2F0409%2F01%2F15.jpg%2521960.jpg") no-repeat top center #ffffff;

            background-size: 100%;

            padding: 0;

            margin: 0;

            font-size: 12px;

            font-family: "微软雅黑", sans-serif;

        }

        .ui-dialog {

            width: 380px;

            position: absolute;

            z-index: 9000;

            top: 100px;

            left: 100px;

            border: 1px solid #d5d5d5;

            background-color: #ffffff;

            /*display: none;*/

        }

        .ui-dialog-title {

            height: 48px;

            line-height: 48px;

            padding-left: 20px;

            color: #535353;

            font-size: 16px;

            background-color: #f5f5f5;

            border-bottom: 1px solid #efefef;

            cursor: move;

        }

        .ui-dialog-title-closebutton {

            width: 16px;

            height: 16px;

            display: inline-block;

            position: absolute;

            right: 20px;

            color: #000;

            text-decoration: unset;

        }

        .ui-dialog-title-closebutton:hover {

           color: #4ca8ff;

        }

        .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: 0;

            padding: 0;

            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: #ffffff;

            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;

            opacity: 0.4;

            position: absolute;

            top: 0;

            left: 0;

            z-index: 8000;

            display: none;

        }

        .link {

            text-align: right;

            line-height: 20px;

            padding-right: 40px;

        }

    </style>

</head>

 

 

 

<body>

 

    <div class="ui-dialog" id="dialog">

        <div class="ui-dialog-title" id="dialogTitle">

            登录

            <!-- 右上角的关闭按钮 -->

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

 

    <div class="ui-mask" id="mask"></div>

    <div class="link">

        <a href="javascript:showDialog();" style=" text-decoration: unset;color: #4ca8ff">登录</a>

    </div>

 

    <script type="text/javascript">

        // 获取元素对象

        function g(id) {

            return document.getElementById(id);

        }

        // 自动居中函数 -- 登录浮层

        // el {Element}

        function autoCenter(el) {

            // 获得可视区域的宽和高

            var bodyW = document.documentElement.clientWidth;

            var bodyH = document.documentElement.clientHeight;

            // 获得元素 el 的宽和高

            var elW = el.offsetWidth;

            var elH = el.offsetHeight;

            // 设置元素的 style 样式

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

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

        }

        // 扩展元素到整个可视区域 -- 遮罩层

        // el {Element}

        function fillToBody(el) {

            // 将元素的宽和高设置的和可视区域一样

            el.style.width = document.documentElement.clientWidth + 'px';

            el.style.height = document.documentElement.clientHeight + 'px';

        }

        // 定义全局变量

        var mouseOffsetX = 0;

        var mouseOffsetY = 0;

        var isDragging = false;

        // 鼠标事件1 -- 在标题栏上按下

        // 计算鼠标相对拖拽元素的的左上角的坐标, 并且标记元素为可拖动

        g('dialogTitle').addEventListener('mousedown', function(e) {

            var e = e || window.event;

            // 用鼠标按下时的坐标减去 dialog 的左上角坐标

            mouseOffsetX = e.pageX - g('dialog').offsetLeft;

            mouseOffsetY = e.pageY - g('dialog').offsetTop;

            isDragging = true;

        });

        // 鼠标事件2 -- 鼠标移动

        document.onmousemove = function(e) {

            var e = e || window.event;

            // 鼠标当前位置

            var mouseX = e.pageX;

            var mouseY = e.pageY;

            // 鼠标从单击时至当前时刻移动的距离

            var moveX = 0;

            var moveY = 0;

            if (isDragging === true) {

                moveX = mouseX - mouseOffsetX;

                moveY = mouseY - mouseOffsetY;

                // 范围限定

                // moveX > 0 moveX < (页面最大宽度 - 浮层宽度)

                // moveY > 0 moveY < (页面最大宽度 - 浮层高度)

                var pageWidth = document.documentElement.clientWidth;

                var pageHeight = document.documentElement.clientHeight;

                // 登录浮层的宽、高

                var dialogWidth = g('dialog').offsetWidth;

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

                var maxX = pageWidth - dialogWidth;

                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3 -- 鼠标松开

        document.onmouseup = function() {

            isDragging = false;

        };

        // 展现登录浮层

        function showDialog() {

            g('dialog').style.display = 'block';

            g('mask').style.display = 'block';

            autoCenter(g('dialog'));

            fillToBody(g('mask'));

        }

        // 隐藏登录浮层

        function hideDialog() {

            g('dialog').style.display = 'none';

            g('mask').style.display = 'none';

        }

        window.onresize = function() {

            autoCenter(g('dialog'));

            fillToBody(g('mask'));

        };

        showDialog();

        autoCenter(g('dialog'));

    </script>

 

</body>

</html>

 

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CSS教程文章修订日期:2017-03-17 15:21 原创:DIVCSS5
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