[TimLinux] JavaScript 模态框可拖动功能实现——jQuery版

其他 2019-07-23 14:38:35 阅读次数: 0 
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>jQuery - Drag</title>
    <style>
        .modal {
            position: fixed;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(100, 100, 100, 0.5);
            z-index: 2001;
        }
        
        .modal-content {
            position: absolute;
            width: 500px;
            height: 300px;
            left: 50%;
            margin-left: -250px;
            margin-top: 100px;
            border: 10px solid rgba(150, 150, 150, 0.5);
            background-color: white;
            text-align: center;
        }
        
        .modal-title {
            height: 38px;
            border-bottom: 1px solid blue;
            text-align: left;
            padding: 0 10px;
            font-weight: bold;
            cursor: move;
        }
        
        .modal-title div {
            display: inline-block;
            font-size: larger;
            line-height: 2;
            padding: 0 8px;
        }
        
        .modal-title .modal-close {
            float: right;
            cursor: pointer;
        }
        
        .modal-title .modal-close:hover {
            background-color: rgb(198, 236, 236);
        }
    </style>
</head>
<body>
    <div>
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    </div>
    <div id="idModal" class="modal">
        <div id="idModalDetail" class="modal-content">
            <div id="idModalTitle" class="modal-title">
                <div>可拖动</div>
                <div class="modal-close">X</div>
            </div>
            <div class="modal-body">This is drag modal</div>
        </div>
    </div>
    <script type="text/javascript" src="./jquery-2.2.4.js"></script>
    <script>
        // 拖动时，偶发选中文本，将该选择功能禁用
        function cancelUserSelect(ele) {
            if (!ele) return false;
            document.body.style.userSelect = 'none';
            document.body.style.webkitUserSelect = 'none';
            document.body.style.msUserSelect = 'none';
            document.body.style.mozUserSelect = 'none';

            ele.style.userSelect = 'none';
            ele.style.webkitUserSelect = 'none';
            ele.style.msUserSelect = 'none';
            ele.style.mozUserSelect = 'none';
        }
        
        // 恢复禁用的文本选择功能
        function restoreUserSelect(ele) {
            if (!ele) return false;
            document.body.style.userSelect = 'text';
            document.body.style.webkitUserSelect = 'text';
            document.body.style.msUserSelect = 'text';
            document.body.style.mozUserSelect = 'text';

            ele.style.userSelect = 'text';
            ele.style.webkitUserSelect = 'text';
            ele.style.msUserSelect = 'text';
            ele.style.mozUserSelect = 'text';
        }
        
        function drag() {
            var $idModalTitle = $('#idModalTitle');
            var $idDragModal = $idModalTitle.parent();

            var mouseStartPoint = {left: 0, top: 0};
            var mouseEndPoint = {left: 0, top: 0};
            var oldPoint = {left: 0, top: 0};
            var isDraging = false;

            $(document).on('mousedown', '.modal-title', function(e) {
                // 关闭按钮不进行移动
                if ($(e.target).hasClass('modal-close')) return false;
                isDraging = true;

                mouseStartPoint = {left: e.clientX, top: e.clientY};
                oldPoint = $idDragModal.offset();  // 鼠标离模态框边距值
                cancelUserSelect($idDragModal.get(0));
            });

            $(document).on('mousemove', function(e) {
                if (!isDraging) return false;
                
                if ($idDragModal.css('margin-left') !== 0) {
                    $idDragModal.css('margin-left', 0);
                }
                
                if ($idDragModal.css('margin-top') !== 0) {
                    $idDragModal.css('margin-top', 0);
                }

                var mouseX = e.clientX;
                var mouseY = e.clientY;
                
                if (mouseX < 0) mouseX = 0;
                if (mouseY < 0) mouseY = 25;
                
                mouseEndPoint = {left: mouseX, top: mouseY};

                var newPoint = {
                    left: mouseEndPoint.left - (mouseStartPoint.left - oldPoint.left),
                    top: mouseEndPoint.top - (mouseStartPoint.top - oldPoint.top)
                };
                
                $idDragModal.offset(newPoint);
            });

            $(document).on('mouseup', function(e) {
                if (!isDraging) return false;
                isDraging = false;
                restoreUserSelect($idDragModal.get(0));
            });
        }

        drag();
    </script>
</body>
</html>

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