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April 7, 2024 10:53
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A sham that will throw a window resize event even when scrollbars are added/removed (this is not something the standard window resize event does). Tested in IE9+, Chrome & Firefox latest.
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// Demo: http://jsfiddle.net/pFaSx/ | |
// Create an invisible iframe | |
var iframe = document.createElement('iframe'); | |
iframe.id = "hacky-scrollbar-resize-listener"; | |
iframe.style.cssText = 'height: 0; background-color: transparent; margin: 0; padding: 0; overflow: hidden; border-width: 0; position: absolute; width: 100%;'; | |
// Register our event when the iframe loads | |
iframe.onload = function() { | |
// The trick here is that because this iframe has 100% width | |
// it should fire a window resize event when anything causes it to | |
// resize (even scrollbars on the outer document) | |
iframe.contentWindow.addEventListener('resize', function() { | |
try { | |
var evt = document.createEvent('UIEvents'); | |
evt.initUIEvent('resize', true, false, window, 0); | |
window.dispatchEvent(evt); | |
} catch(e) {} | |
}); | |
}; | |
// Stick the iframe somewhere out of the way | |
document.body.appendChild(iframe); |
Thanks @MartijnHols! It's nice to know there is a clean way of achieving this 10 years since I first posted my hacky solution!
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You can use
window.visualViewport?.addEventListener('resize', update);
for this nowadays. It was introduced in 2019 and supported by basically every modern browser. The resize event triggers for any resize, including the opening and resizing of the on-screen keyboard on iOS and the scrollbar appearing.