ANGULAR2 the page data is not refreshed after the HTTP request returns data

The data returned after a request with HTTP is updated, but the data for the bound page is not refreshed, and after finding it, it is found that the change detection changedetectorref can be used for detection refresh.

Official Document Description: Changedetectorref

The application code is as follows:

Import {component,ngmodule,changedetectorref, oninit}from ' @angular/core '; Constructor (Private CDR : Changedetectorref) {}getcommentitemsfunc () {    this. Commentservice.getcommentitems(ID  )      = =        {this. commentitems = commentitems        ;  This.cdr.markForCheck ();        this. cdr.detectchanges ();      })  }    

Note : To be in This.cdr.markForCheck (); Then add this.cdr.detectChanges (); Otherwise, the data on the page will not be refreshed.

end!

ANGULAR2 the page data is not refreshed after the HTTP request returns data