[html] Detecting real time window size changes in Angular 4

If you want to react on certain breakpoints (e.g. do something if width is less than 768px), you can also use BreakpointObserver:

import {BreakpointObserver, Breakpoints} from '@angular/cdk/layout';

{ ... }

const isSmallScreen = breakpointObserver.isMatched('(max-width: 599px)');

or even listen to changes to that breakpoint:

breakpointObserver.observe([
  '(max-width: 768px)'
    ]).subscribe(result => {
      if (result.matches) {
        doSomething();
      } else {
        // if necessary:
        doSomethingElse();
      }
    });

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