Angular2 disable button

Question

I know that in angular2 I can disable a button with the [disable] attribute, for example:

<button [disabled]="!isValid" (click)="onConfirm()">Confirm</button>

but can I do it using [ngClass] or [ngStyle] ? Like so:

<button [ngStyle]="{disabled : !isValid}" (click)="onConfirm()">Confirm</button>

Thanks.

Answer 1

Update

I'm wondering. Why don't you want to use the [disabled] attribute binding provided by Angular 2? It's the correct way to dealt with this situation. I propose you move your isValid check via component method.

<button [disabled]="! isValid" (click)="onConfirm()">Confirm</button>

The Problem with what you tried explained below

Basically you could use ngClass here. But adding class wouldn't restrict event from firing. For firing up event on valid input, you should change click event code to below. So that onConfirm will get fired only when field is valid.

<button [ngClass]="{disabled : !isValid}" (click)="isValid && onConfirm()">Confirm</button>

Demo Here

Answer 2

I would recommend the following.

<button [disabled]="isInvalid()">Submit</button>

Answer 3

Yes you can

<div class="button" [ngClass]="{active: isOn, disabled: isDisabled}"
         (click)="toggle(!isOn)">
         Click me!
 </div>

https://angular.io/docs/ts/latest/api/common/NgClass-directive.html

Answer 4

If you have a form then the following is also possible:

<form #f="ngForm">
    <input name="myfield" type="text" minlenght="3" required ngModel>
    <button type="submit" [disabled]="!f.valid">Submit</button>
</form>

Demo here: http://plnkr.co/edit/Xm2dCwqB9p6WygrquUGh?p=preview&open=app%2Fapp.component.ts

Answer 5

Using ngClass to disabled the button for invalid form is not good practice in Angular2 when its providing inbuilt features to enable and disable the button if form is valid and invalid respectively without doing any extra efforts/logic.

[disabled] will do all thing like if form is valid then it will be enabled and if form is invalid then it will be disabled automatically.

See Example:

<form (ngSubmit)="f.form.valid" #f="ngForm" novalidate>
<input type="text" placeholder="Name" [(ngModel)]="txtName" name="txtname" #textname="ngModel" required>
<input type="button" class="mdl-button" [disabled]="!f.form.valid" (click)="onSave()" name="">

Answer 6

May be below code can help:

<button [attr.disabled]="!isValid ? true : null">Submit</button>

Answer 7

I tried using disabled along with click event. Below is the snippet , the accepted answer also worked perfectly fine , I am adding this answer to give an example how it can be used with disabled and click properties.

<button (click)="!planNextDisabled && planNext()" [disabled]="planNextDisabled"></button>

Answer 8

If you are using reactive forms and want to disable some input associated with a form control, you should place this disabled logic into you code and call yourFormControl.disable() or yourFormControl.enable()

Answer 9

I think this is the easiest way

<!-- Submit Button-->
<button 
  mat-raised-button       
  color="primary"
  [disabled]="!f.valid"
>
  Submit
</button>

Answer 10

 <button [disabled]="this.model.IsConnected() == false"
              [ngClass]="setStyles()"
              class="action-button action-button-selected button-send"
              (click)= "this.Send()">
          SEND
        </button>

.ts code

setStyles() 
{
    let styles = {

    'action-button-disabled': this.model.IsConnected() == false  
  };
  return styles;
}