[TimLinux] JavaScript 模态框可拖动功能实现——节流版
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>setTimeout - 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);
}; function modalMove(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.onmousemove = function() {
var that = this;
var thatArguments = arguments;
clearTimeout(modalMove.timeoutId);
modalMove.timeoutId = setTimeout(function() {
modalMove.apply(that, thatArguments);
}, 50);
}; document.onmouseup = function(e) {
if (!isDraging) return false;
isDraging = false;
restoreUserSelect(idDragModal);
};
} drag();
</script>
</body>
</html>
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