CheckBox Function calling a button with IONIC 2 - ionic-framework

Question

I'm simulating something like a shopping cart using ionic 2. Basically you write the item's name and value and it's creating a list with checkbox as in the image below.
But I wanted the option only appear when selecting one of the checkboxes, and did not stay static on the screen as it is now. How can I do this?
grid calling the CheckBox:
<ion-grid>
<ion-row *ngFor="let item of produto">
<ion-item>
<ion-label (click)="clicou(item.desc)">
{{ item.desc }} {{ item.valor }}
</ion-label>
<ion-checkbox checked="false"></ion-checkbox>
</ion-item>
</ion-row>
</ion-grid>
button code part:
<button ion-button block (click)="remove()" color="danger" style="transition: none 0s ease 0s;">
<span class="button-inner">
<ion-icon name="close"></ion-icon>
Remover Selecionados
</span>
<div class="button-effect"></div>
</button>

Answer 1

in ts create a variable that contains the value of the checks, as an example I will use productState which will be boolean type, and create in produto a state.
you can use a ngmodel and the variable already created (productState) to validate the status of the product, and use the event (ionchange) to this
<ion-grid>
<ion-row *ngFor="let item of produto">
<ion-item>
<ion-label (click)="clicou(item.desc)">
{{ item.desc }} {{ item.valor }}
</ion-label>
<ion-checkbox (ionChange)="validState()" [(ngModel)]="productState" ></ion-checkbox>
</ion-item>
</ion-row>
in ts create a function to valid the state of products:
validState(){
let cont = 0;
for (let index = 0; index < this.produto.length; index++) {
if (this.produto[index].State){
cont++;
}
}
if(cont >=1){
this.productState = true;
}else{
this.productState = false;
}
}
and in the button we will use ngIf to validate the product status through productState
<button *ngIf="productState" ion-button block (click)="remove()" color="danger" style="transition: none 0s ease 0s;">
<span class="button-inner">
<ion-icon name="close"></ion-icon>
Remover Selecionados
</span>
<div class="button-effect"></div>
</button>
ngIf docs
ngmodel docs