How to get Button value and set it in input in angular/ionic

In Html

<button ion-button class="button icon ion-home" round (click)="getColor()" id="one">{{value}}</button>

In Angular

export class HomePage {
  value: number = 0;
  constructor(public navCtrl: NavController) {

  }
  getColor() { 
    console.log(this.value);
  }
}

First define variable in Component then use it in html. This way you will be able to access it easily.

Use the $event property which will contain information about the clicked element, presumably $event.target:

In your HTML:

(click)="getColor($event)"

In your TS file:

getColor ($event: any) {
    // debug the value of $event
}

Or use the method @RobYed provided by passing "0" as the argument.

/*********

**EDIT : **

I added the setting of the input value with the button text.

**********/

using ElementRef and ViewChild is one way

ElementRef - is the most basic abstraction. If you observe it’s class structure, you’ll see that it only holds the native element it’s associated with. It’s useful for accessing native DOM element

//

@ViewChild - Angular provides a mechanism called DOM queries. It comes in a form of @ViewChild decorator. You can use ViewChild to get the first element or the directive matching the selector from the view DOM.

from the doc ..

basically assing to an element in your html code 'id' (but in the angular way - not id="...") somthing like #someId, than you can access that element object using

@ViewChild('someId') myElement: ElementRef

can read about it here Exploring Angular DOM manipulation

the code:

 <button #btn
      ion-button class="button icon ion-home" round 
      (click)="getColor()">
      0
 </button>
 <ion-input #myInput></ion-input>

// ==================

 import { Component, ElementRef, ViewChild } from '@angular/core';

 import { NavController, TextInput } from 'ionic-angular';

 @Component({
      selector: 'page-home',
      templateUrl: 'home.html'
 })
 export class HomePage {

      @ViewChild('btn') btn: ElementRef;
      @ViewChild('myInput') myInput: TextInput;

      constructor(public navCtrl: NavController) {}
      getColor() { 
           const btnText = this.btn.nativeElement.textContent;
           this.myInput.value = btnText; // here you set the value of the
                                         // input to the text on your button
      }
 }

// =============================================================//

author approach, send the HTML object as a parameter to the function you call on (click)

 <button #btn
      ion-button class="button icon ion-home" round 
      (click)="getColor(btn)">
      0
 </button>
 <ion-input #myInput></ion-input>

// =====================

 import { Component, ViewChild } from '@angular/core';
 import { NavController, TextInput } from 'ionic-angular';

 @Component({
      selector: 'page-home',
      templateUrl: 'home.html'
 })
 export class HomePage {

      @ViewChild('myInput') myInput: TextInput;

      constructor(public navCtrl: NavController) {}
      getColor(myBtn: HTMLButtonElement) { 
            this.myInput.value = myBtn.innerHTML;
      }

 }

// =============================================================//

one more way, maybe the most simplistic is with property binding.

bind the'value' property of ion-input with class member.

 <button #btn
      ion-button class="button icon ion-home" round 
      (click)="getColor(btn)">
      0
 </button>
 <ion-input [value]="inputValue"></ion-input>

// =====================

 import { Component } from '@angular/core';
 import { NavController } from 'ionic-angular';

 @Component({
      selector: 'page-home',
      templateUrl: 'home.html'
 })
 export class HomePage {

      inputValue: string = "";

      constructor(public navCtrl: NavController) {}
      getColor(myBtn: HTMLButtonElement) { 
            this.inputValue = myBtn.innerHTML;
      }

 }