angular - How to refresh html element after modifying element -

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i have been trying print after modifying html element element has not been changed. (angular2) source code simplified one.

<div *ngif="displaytype === 'screen'">        <div>this screen</div>   </div> <div *ngif="displaytype === 'print'">        <div>this print</div>   </div>

and when click button following event.

    displaytype: string = 'screen'; // default     onprint() {             this.displaytype = 'print';             let tmp = document.createelement('div');            let el = this.elementref.nativeelement.clonenode(true);                tmp.appendchild(el);              let content = tmp.innerhtml;            let frame1 = document.createelement('iframe');            document.body.appendchild(frame1);             let framedoc = frame1.contentwindow;                framedoc.document.open();            framedoc.document.write('<html><body>'+content+'</body></html>');            framedoc.document.close();             settimeout(function () {                window.frames["frame1"].focus();                window.frames["frame1"].print();                document.body.removechild(frame1);            }, 500);    }

but contents elements before modifying. how can refresh elements?

to refresh elements need trigger change detection. here post change detection in angular 2: http://blog.thoughtram.io/angular/2016/02/22/angular-2-change-detection-explained.html

i've created plunker here illustrate it: http://plnkr.co/edit/0zwkaq776mkplyzjogyx?p=preview

<button (click)="onprint()">onprint</button>

also should not modify dom elements directly, should create component , use structural directive display (here component has selector "my-print"):

<my-print *ngif="isprint" [iframesrc]="..."></my-print>

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