Are there any methods to monitor changes in the browser window using an Observable, such as rxJS or a similar tool? I am interested in triggering an action whenever the browser window is resized.
Are there any methods to monitor changes in the browser window using an Observable, such as rxJS or a similar tool? I am interested in triggering an action whenever the browser window is resized.
If I'm understanding you correctly, you're looking to monitor the resize event of the window.
Using RxJS makes this task quite straightforward:
Rx.Observable
.fromEvent(window, 'resize')
.subscribe(event => {
// display the new width and height of the window
console.log(window.innerWidth, window.innerHeight)
// alternatively
console.log(event.target.innerWidth, event.target.innerHeight)
})
A brand new feature has emerged known as ResizeObserver. It is designed to detect changes in the size of any observed elements, regardless of the trigger for the change.
The following code snippet is sourced from the Google Dev Blog:
var ro = new ResizeObserver( entries => {
for (let entry of entries) {
const cr = entry.contentRect;
console.log('Element:', entry.target);
console.log(`Element size: ${cr.width}px x ${cr.height}px`);
console.log(`Element padding: ${cr.top}px ; ${cr.left}px`);
}
});
// Observing a single or multiple elements
ro.observe(someElement);
Unfortunately, ResizeObserver is only available in Chrome 55 Canary behind the Experimental Web Platform flag. Essentially, you will need a polyfill: https://github.com/WICG/ResizeObserver/issues/3
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