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95 lines
2.8 KiB
JavaScript
95 lines
2.8 KiB
JavaScript
5 years ago
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/**
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* Get rid of full-page overlays.
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*
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* @title rm overlays
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*/
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(function rmo() {
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function getFirstZIndexedElement(elements) {
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if (!Array.isArray(elements)) {
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elements = Array.from(elements);
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}
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for (let i = 0; i < elements.length; i++) {
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if (!isNaN(getComputedStyle(elements[i]).zIndex)) {
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return elements[i];
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}
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}
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return null;
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}
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/* Recursively execute the logic on the document and its sub-documents. */
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function execute(document) {
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/* Look for absolutely positioned (well, Z-indexed) elements that
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* cover the entire width of the page. Look for them in the vertical
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* center, to avoid cookie/GDPR/… banners that are typically at the
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* top or bottom of the window, and slightly away from the edges, to
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* avoid scrollbars/social sharing toolbars/… */
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let leftX = 64;
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let leftY = document.defaultView.innerHeight / 2;
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let leftOverlay = getFirstZIndexedElement(document.elementsFromPoint(leftX, leftY));
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if (!leftOverlay)
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return;
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let rightX = document.defaultView.innerWidth - 64;
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let rightY = document.defaultView.innerHeight / 2;
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let rightOverlay = getFirstZIndexedElement(document.elementsFromPoint(rightX, rightY));
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if (!rightOverlay)
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return;
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if (leftOverlay !== rightOverlay)
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return;
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let centerX = document.defaultView.innerWidth / 2;
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let centerY = document.defaultView.innerHeight / 2;
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let centerElements = document.elementsFromPoint(centerX, centerY);
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if (!centerElements.indexOf(leftOverlay) === -1)
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return;//leftOverlay not in center
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/* Hide the overlay and its “visual descendants” (i.e., the elements
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* on top of the overlay). */
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for (let i = 0; i < centerElements.length; i++) {
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centerElements[i].style.display = 'none';
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if (centerElements[i] === leftOverlay) {
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break;
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}
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}
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/* Re-enable scrolling on the BODY element. */
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let currentBodyStyle = document.body.hasAttribute('style')
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? document.body.getAttribute('style')
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: '';
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let newBodyStyle = currentBodyStyle +
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'; overflow: auto !important' +
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'; position: static !important';
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document.body.setAttribute('style', newBodyStyle);
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/* Re-enable scrolling on Quora.com. */
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document.body.classList.remove('login_no_scroll');
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/* Re-enable scrolling disabled by inline styles. */
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[].forEach.call(
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document.querySelectorAll('[style*="overflow"][style*="hidden"]'),
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function (elem) {
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elem.setAttribute('style', elem.getAttribute('style').replace(/overflow\s*:\s*hidden\s*;?/, ''));
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}
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);
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/* Recurse for frames and IFRAMEs. */
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try {
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Array.from(
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document.querySelectorAll('frame, iframe, object[type^="text/html"], object[type^="application/xhtml+xml"]')
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).forEach(
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elem => execute(elem.contentDocument)
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);
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} catch (e) {
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/* Catch and ignore exceptions for out-of-domain access. */
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}
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}
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execute(document);
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})();
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