ngx-bootstrap
Version:
Native Angular Bootstrap Components
43 lines • 4.79 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* Returns the offset parent of the given element
*/
import { getStyleComputedProperty } from './getStyleComputedProperty';
import { isIE } from './isIE';
/**
* @param {?} element
* @return {?}
*/
export function getOffsetParent(element) {
if (!element) {
return document.documentElement;
}
/** @type {?} */
const noOffsetParent = isIE(10) ? document.body : null;
// NOTE: 1 DOM access here
/** @type {?} */
let offsetParent = element.offsetParent || null;
// Skip hidden elements which don't have an offsetParent
/** @type {?} */
let sibling;
while (offsetParent === noOffsetParent && element.nextElementSibling && element.nodeName !== 'BODY') {
sibling = element.nextElementSibling;
offsetParent = sibling.offsetParent;
}
/** @type {?} */
const nodeName = offsetParent && offsetParent.nodeName;
if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {
return sibling ? sibling.ownerDocument.documentElement : document.documentElement;
}
// .offsetParent will return the closest TH, TD or TABLE in case
// no offsetParent is present, I hate this job...
if (['TH', 'TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 &&
getStyleComputedProperty(offsetParent, 'position') === 'static') {
return getOffsetParent(offsetParent);
}
return offsetParent;
}
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