Initial position of the range slider in IONIC 2

I have been searching the web extensively to find a solution to this particular issue. I am working with a range slider and trying to set its default starting values, but so far, I haven't had any luck. I've checked both the official documentation and various online resources without success. Can anyone guide me on the correct approach? Currently, I am able to display the actual value of the range using the following code:

home.html

  <ion-item>
    <ion-range [(ngModel)]="rangeSettings" (ionChange)="cValue($event, 'slider1')">
      <ion-icon range-left small name="water"></ion-icon>
      <ion-icon range-right name="water"></ion-icon>
    </ion-range>
  </ion-item>
  Water Flow
  <ion-badge color="secondary">{{slideValueBadge[slideValueBadge.length -1]}}</ion-badge>

home.ts

import { Component } from '@angular/core';

import { NavController } from 'ionic-angular';
import * as io from 'socket.io-client';


@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
  socket:any
  chat_input:string;
  chats = [];
  prova = [];
  rangeSettings:any;
  slideValueBadge = [];


  constructor(public navCtrl: NavController) {
   var a;
   this.socket = io('http://localhost:3000');

   this.rangeSettings = {
       type: "double",
       min: 0,
       max: 1000,
       from: 200,
       to: 500
   };


   this.socket.on('message', (msg) => {
     console.log("message", msg);
     this.chats.push(msg);
   });

   this.socket.on('prova', (msgProva) => {
       console.log("msgProva", msgProva);
       this.prova.push(msgProva);
   });

   this.socket.on('sValue', (value) => {
       this.slideValueBadge.push(value);
       console.log("sliderValue:", value);
   });
  }

  send(msg) {
        if(msg != ''){
            this.socket.emit('message', msg);
        }
        this.chat_input = '';
  }
  cValue(event, nome) {
      console.log("SliderValue", event._valA);
      this.socket.emit('sValue', event._valA);
  }
}

Can someone kindly guide me on how to set the default starting position of the slider to, for example, 20?

Answer №1

To avoid making the value of the range [(ngModel)] an object, simply update it to rangeSettings: number = 20;

You can also configure this option directly in the HTML code.

<ion-range dualKnobs="true" min="0" max="1000" step="2" [(ngModel)]="rangeSettings">

Answer №2

It seems like you're attempting to assign properties within the [(ngModel)] directive. The purpose of [(ngModel)] is to create a two-way binding between a property and the user interface. When used correctly, it should allow you to set default values.

For example:

In your HTML file:

<ion-range [(ngModel)]="myValue" (ionChange)="cValue($event, 'slider1')">

In your TypeScript file:

myValue = 20;

If you need to set additional properties for the <ion-range> element, such as in the rangeSettings object, you can add them separately like this:

<ion-range min="0" max="1000" [(ngModel)]="myValue" (ionChange)="cValue($event, 'slider1')"></ion-range>

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