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32 lines
837 B
32 lines
837 B
'use strict';
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// Scrollbars / Frame resizes notifications.
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(function () {
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let height;
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const heightLimit = window.outerHeight * 2;
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handleHeightChange(); // Initial frame's height setup.
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setupResizeListener(); // Listen to frame's height changes.
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///
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function setupResizeListener() {
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const resizeObserver = new ResizeObserver(handleHeightChange);
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resizeObserver.observe(document.body);
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}
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function handleHeightChange(entries) {
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const updatedHeight = getCurrentHeight();
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if (height === updatedHeight || updatedHeight > heightLimit) {
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return;
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}
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const RESIZE_CODE = 'resize:';
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height = updatedHeight;
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window.parent.postMessage(RESIZE_CODE + JSON.stringify({height}), '*');
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}
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function getCurrentHeight() {
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return document.querySelector('body > main').scrollHeight;
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}
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})();
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