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'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
var _utils = require('./utils');
var _utils2 = _interopRequireDefault(_utils);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
/**
* 得到会导致元素显示不全的祖先元素
*/
function getOffsetParent(element) {
if (_utils2['default'].isWindow(element) || element.nodeType === 9) {
return null;
}
// ie 这个也不是完全可行
/*
<div style="width: 50px;height: 100px;overflow: hidden">
<div style="width: 50px;height: 100px;position: relative;" id="d6">
元素 6 高 100px 宽 50px<br/>
</div>
</div>
*/
// element.offsetParent does the right thing in ie7 and below. Return parent with layout!
// In other browsers it only includes elements with position absolute, relative or
// fixed, not elements with overflow set to auto or scroll.
// if (UA.ie && ieMode < 8) {
// return element.offsetParent;
// }
// 统一的 offsetParent 方法
var doc = _utils2['default'].getDocument(element);
var body = doc.body;
var parent = void 0;
var positionStyle = _utils2['default'].css(element, 'position');
var skipStatic = positionStyle === 'fixed' || positionStyle === 'absolute';
if (!skipStatic) {
return element.nodeName.toLowerCase() === 'html' ? null : element.parentNode;
}
for (parent = element.parentNode; parent && parent !== body; parent = parent.parentNode) {
positionStyle = _utils2['default'].css(parent, 'position');
if (positionStyle !== 'static') {
return parent;
}
}
return null;
}
exports['default'] = getOffsetParent;
module.exports = exports['default'];