angular - How do i fetch data FROM SERVICE without refreshing the page - IONIC

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Brief explanation: home.ts fetches data from a service using the below code in its OnInit() function:

 this._http.get(this._url+this.SNO+"&"+this.randomno,headers:headers)
 .subscribe(data => {this.list=data.json();

Now this page has a field to add new record. What i am doing is, once user adds the record, i am basically reloading the page using below code:

this.navCtrl.setRoot(CommunicationPage

I want to refresh the data without reloading the page, How do i do this ?

Please advise.

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