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

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