Very often, forms use the input, select and textarea elements to enter text. Knockout.js allows work with such text via the value binding, as shown in the following example (PersonalPage-Binding-Value.html):

The Model will be as follows:

var person = {
  firstName: "John"
};

The ViewModel will be as follows:

var PersonViewModel = function() {
  var self = this;
  self.firstName = ko.observable(person.firstName);
};

The View will be as follows:

<form>
  The first name is <input type="text" data-bind="value: firstName" />.
</form>

The value property of the text input element binds to the firstName property of the ViewModel.