Detect Back button pressed in Angular2

Question

I\'m trying to detect if the back button was pressed when I load this component. In the ngOnInit(), I\'d like to know if Back was clicked so I don\'t clear all my filters. H

Answer 1

create a variable in service , initialize it to false and set it to true inside the ngOnInit method.Since service gets initialized only once , add in ngOnInit :-

 ngOnInit(){
    if(!this._filterService.flag) this._filterService.clear()
  this._filterService.flag = true;
  //rest of your code
 }

Make sure service is initialized only once ,i.e when app is bootstrapped and not inside component's metadata.If page is refreshed , flag value will be false initially and true if component is accessed using back button