how to check fi the window was resized jsavascript code example

Example 1: window change detect

// listen for window reload or part of the page reload
var oldHref = document.location.href;

window.onload = function() {
    var bodyList = document.querySelector("body")
        ,observer = new MutationObserver(function(mutations) {
            mutations.forEach(function(mutation) {
                if (oldHref != document.location.href) {
                    oldHref = document.location.href;
                    /* Changed ! your code here */
                }
            });
        });

    var config = {
        childList: true,
        subtree: true
    };
    observer.observe(bodyList, config);
};

Example 2: div resize event typescript

resizeObservable$: Observable<Event>
resizeSubscription$: Subscription

ngOnInit() {
    this.resizeObservable$ = fromEvent(window, 'resize')
    this.resizeSubscription$ = this.resizeObservable$.subscribe( evt => {
      console.log('event: ', evt)
    })
}