I have a requirement in which there is a form and if all the fields are filled then only submit button will be enabled else the submit button will be in disabled state.

[**This fiddle**](http://jsfiddle.net/M6BzW/576/) works fine for 1 input field:

```html
<button data-bind="enable: my">My Button</button>
<input type="text" name="hi" data-bind="value:my" />

```

```js
ko.applyBindings({ my: ko.observable() });

```

However, I don't know how to do this for *multiple* input fields like as in [this fiddle](http://jsfiddle.net/M6BzW/577/). If there are some 10 input fields then how to enable the submit button if and only if all the fields are filled up.