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  • [TimLinux] JavaScript 模态框可拖动功能实现——原始版

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="utf-8">
        <title>Normal - 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>
            // 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 = document.getElementById('idModalTitle');
                var idDragModal = idModalTitle.parentNode;
                var diffLeft, diffTop, isDraging = false;
                
                idModalTitle.onmousedown = function(e) {
                    var e = e || window.event;
                    isDraging = true;
                    diffLeft = e.clientX - idDragModal.offsetLeft;  // 鼠标离左边框的距离
                    diffTop = e.clientY - idDragModal.offsetTop;  // 鼠标离顶部边框的距离
                    cancelUserSelect(idDragModal);
                };
    
                document.onmousemove = function(e) {
                    var e = e || window.event;
                    if (!isDraging) return false;
                    
                    if (idDragModal.style.marginLeft !== 0) {
                        idDragModal.style.marginLeft = 0;
                    }
                    
                    if (idDragModal.style.marginTop !== 0) {
                        idDragModal.style.marginTop = 0;
                    }
                    
                    // 新的鼠标离浏览器左边距离,减去鼠标离左边框的距离
                    var left = e.clientX - diffLeft;
                    // 新的鼠标离浏览器顶部距离,减去鼠标离顶部边框的距离
                    var top = e.clientY - diffTop;
                    
                    if (left < 0) {
                        left = 0;
                    } else if (left > window.innerWidth - idDragModal.offsetWidth) {
                        left = window.innerWidth - idDragModal.offsetWidth;
                    }
                    
                    if (top < 0) {
                        top = 0;
                    } else if (top > window.innerHeight - idDragModal.offsetHeight) {
                        top = window.innerHeight - idDragModal.offsetHeight;
                    }
                    
                    idDragModal.style.left = left + "px";
                    idDragModal.style.top = top + "px";
                };
    
                document.onmouseup = function(e) {
                    if (!isDraging) return false;
                    isDraging = false;
                    restoreUserSelect(idDragModal);
                };
            }
    
            drag();
        </script>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/timlinux/p/11231330.html
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