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22 lines
910 B
JavaScript
22 lines
910 B
JavaScript
/**
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* The `anchorScroll` utility saves the scroll position relative to an element,
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* and then restores it after a callback has been run.
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*
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* This is useful if a redraw will change the page's content above the viewport.
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* Normally doing this will result in the content in the viewport being pushed
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* down or pulled up. By wrapping the redraw with this utility, the scroll
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* position can be anchor to an element that is in or below the viewport, so
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* the content in the viewport will stay the same.
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*
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* @param {DOMElement} element The element to anchor the scroll position to.
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* @param {Function} callback The callback to run that will change page content.
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*/
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export default function anchorScroll(element, callback) {
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const $window = $(window);
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const relativeScroll = $(element).offset().top - $window.scrollTop();
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callback();
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$window.scrollTop($(element).offset().top - relativeScroll);
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}
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