How disable/enable button with ionic 2?

Question

I have an input field and a button. It must be disable at start. When the input no blank is, the button is enable.

I use a ngModel to take the value of the input and a function (change) to start a function each time the input is changed.

Now I do a little if in the change function.

if(input !== ''){
//enable the button
}else{
//disable the button
}

Have you any idea how to achieve that?

Thanks

Solution

Just have a boolean variable in class:

isenabled:boolean=false;

Change function

if(input !== ''){
//enable the button
isenabled=true; 
}else{
//disable the button
isenabled=false;
}

In Html:

<button ion-button [disabled]="!isenabled"></button>

For changing classes:

<button ion-button [ngClass]="{class:isenabled,class2:!isenabled}"></button>

Check here