Knockout - readonly model binding from selected item in dropdown

http://stackoverflow.com/questions/9769955/knockout-readonly-model-binding-from-selected-item-in-dropdown

HTML

<script src="https://github.com/downloads/SteveSanderson/knockout/knockout-2.0.0.debug.js"></script>
<script src="https://raw.github.com/SteveSanderson/knockout.mapping/master/knockout.mapping.js"></script>
<form data-bind="submit: printTest">
    weight in the box: <BR>
   <!--<input type="text" id="inputWeight" value="" data-bind="value: inputWeight" />-->
    <lable data-bind="text:inputWeight"></lable>
    <BR>
    <button type="submit">Submit</button>
</form>

JavaScript

var viewModel = function () {
    var self = this;
    self.inputWeight = ko.observable(5);
    
   printTest = function() {

        self.inputWeight(7);
       // var valueEntered = self.inputWeight();
        // if(valueEntered) {
         //     alert("You entered: " + valueEntered);
       // }
       // else {
         //   alert("Would you please enter some text?");
          // }
    }
};

ko.applyBindings(new viewModel());