@ngdoc error
@name ngModel:numfmt
@fullName Model is not of type `number`
@description

The `input[number]` and `input[range]` directives require the model to be a `number`.

If the model is something else, this error will be thrown.

AngularJS does not set validation errors on the `<input>` in this case
as this error is caused by incorrect application logic and not by bad input from the user.

If your model does not contain actual numbers then it is up to the application developer
to use a directive that will do the conversion in the `ngModel` `$formatters` and `$parsers`
pipeline.

## Example

In this example, our model stores the number as a string, so we provide the `stringToNumber`
directive to convert it into the format the `input[number]` directive expects.


<example module="numfmt-error-module" name="number-format-error">
 <file name="index.html">
  <table>
    <tr ng-repeat="x in ['0', '1']">
      <td>
        <input type="number" string-to-number ng-model="x" /> {{ x }} : {{ typeOf(x) }}
      </td>
    </tr>
  </table>
 </file>
 <file name="app.js">
  angular.module('numfmt-error-module', [])

  .run(function($rootScope) {
    $rootScope.typeOf = function(value) {
      return typeof value;
    };
  })

  .directive('stringToNumber', function() {
    return {
      require: 'ngModel',
      link: function(scope, element, attrs, ngModel) {
        ngModel.$parsers.push(function(value) {
          return '' + value;
        });
        ngModel.$formatters.push(function(value) {
          return parseFloat(value);
        });
      }
    };
  });
 </file>
</example>
