Angular JS update input field after change

I’m trying to build a simple calculator in Angular in which I can override the total if I want. I have this part working but when I then go back to enter in a number in fields one or two the total isn’t updated in the field.

Here is my jsfiddle

The form

<div ng-app>

  <div ng-controller="TodoCtrl">
        <li>Number 1: <input type="text" ng-model="one">  
        <li>Number 2: <input type="text" ng-model="two">
        <li>Total <input type="text" value="{{total()}}">       

The javascript

function TodoCtrl($scope) {
    $ = function(){
        return $ * $scope.two;

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I’m guessing that when you enter a value into the totals field that value expression somehow gets overwritten.

However, you can take an alternative approach: Create a field for the total value and when either one or two changes update that field.

<li>Total <input type="text" ng-model="total">{{total}}</li>

And change the javascript:

function TodoCtrl($scope) {
    $scope.$watch('one * two', function (value) {
        $ = value;

Example fiddle here.

You can add ng-change directive to input fields. Have a look at the docs example.

Create a directive and put a watch on it.

app.directive("myApp", function(){

    function:getTotal(){ your maths here

    scope.$watch('one', getTotals());
    scope.$watch('two', getTotals());


You just need to correct the format of your html

    <li>Number 1: <input type="text" ng-model="one"/> </li>
    <li>Number 2: <input type="text" ng-model="two"/> </li>
        <li>Total <input type="text" value="{{total()}}"/>  </li>      


I wrote a directive you can use to bind an ng-model to any expression you want. Whenever the expression changes the model is set to the new value.

module.directive('boundModel', function() {
  return {
    require: 'ngModel',
    link: function(scope, elem, attrs, ngModel) {
      scope.$watch(attrs.boundModel, function(newValue, oldValue) {
        if(newValue != oldValue) {

You can use it in your templates like this:

 <li>Total<input type="text" ng-model="total" bound-model="one * two"></li>