[angular] onchange equivalent in angular2

i'm using onchange to save the value of my input range into firebase , but i have an error who say that my function is not defined.

this is my function

saverange(){
  this.Platform.ready().then(() => {
    this.rootRef.child("users").child(this.UserID).child('range').set(this.range)
  })
} 

this is my html

<ion-item>
  <ion-row>
    <ion-col>Rayon <span favorite><strong> {{range}} km</strong></span></ion-col>
    <ion-col><input type="range" name="points" min="0" max="40" [(ngModel)]="range" onchange="saverange()"></ion-col>
  </ion-row>
</ion-item>

what is the equivalent of onchange in angular , if one exist. thank you

@Mark Rajcok gave a great solution for ion projects that include a range type input.

In any other case of non ion projects I will suggest this:

HTML:

<input type="text" name="points" #points maxlength="8" [(ngModel)]="range" (ngModelChange)="range=saverange($event, points)">

Component:

    onChangeAchievement(eventStr: string, eRef): string {

      //Do something (some manipulations) on input and than return it to be saved:

       //In case you need to force of modifing the Element-Reference value on-focus of input:
       var eventStrToReplace = eventStr.replace(/[^0-9,eE\.\+]+/g, "");
       if (eventStr != eventStrToReplace) {
           eRef.value = eventStrToReplace;
       }

      return this.getNumberOnChange(eventStr);

    }

The idea here:

1. Letting the (ngModelChange) method to do the Setter job:

   (ngModelChange)="range=saverange($event, points)

2. Enabling direct access to the native Dom element using this call:

   eRef.value = eventStrToReplace;

You can use:

<input (input)="saverange()>

In Angular you can define event listeners like in the example below:

<!-- Here you can call public methods from parental component -->
<input (change)="method_name()">