AngularJS encounters an error with ng-model when a string is entered as the input type for a

What happens when the value of ng-model is a "24" (string) instead of 24 (number) on an input[type="number"]? It triggers the following error:

Error: [ngModel:numfmt] http://errors.angularjs.org/1.5.8/ngModel/numfmt?p0=24

I attempted to set the input like this:

<input class="form-control" type="number" name="HouseNumber"
       ng-model="Number(HouseNumber)" />

However, this also resulted in an error:

Error: [ngModel:nonassign] http://errors.angularjs.org/1.5.8/ngModel/nonassign

Is there a way to make AngularJS ignore this error/strict binding, or automatically convert it to a number in the ng-model?

I'm unable to change the input to type="text".


To better understand the issue

angular.module("app", [])

.controller("controller", function ($scope) {
  // Changing this to $scope.number = 24; directly in the code is not possible
  $scope.number = "24";
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.5/angular.min.js"></script>

<div ng-app="app" ng-controller="controller">
  <input type="number" ng-model="number"/>
</div>

Switching the input type to type="text" resolves the issue
However, this is not feasible in the actual code, as the input must remain a number.

angular.module("app", [])

.controller("controller", function ($scope) {
  // Changing this to $scope.number = 24; directly in the code is not possible
  $scope.number = "24";
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.5/angular.min.js"></script>

<div ng-app="app" ng-controller="controller">
  <input type="text" ng-model="number"/>
</div>

Answer №1

If you find yourself unable to modify the initialization of a variable and convert a string, then consider adjusting the input. (If the mountain won't come to Muhammad, Muhammad must go to the mountain)

To achieve this, you can create a custom directive that alters the input functionality. Below is an example of how this can be implemented:

var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
  $scope.x = "24";
});

app.directive('input', function() {
  return {
    restrict: 'E',
    require: 'ngModel',
    link: function(scope, $el, attrs, ngModel) {
      if ($el[0].type === "number") {
        ngModel.$parsers.push(function(value) {
          return Number(value);
        });
        ngModel.$formatters.push(function(value) {
          return parseFloat(value, 10);
        });
      }

    }
  }
})
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>

<div ng-app="myApp" ng-controller="myCtrl">
  <input type="number" ng-model="x">
</div>

Answer №2

Although my experience with Angular is limited, it seems like a simple parseInt function could easily accomplish the task you are requesting.

angular.module("app", [])

.controller("controller", function ($scope) {
  // To achieve this, I could use $scope.number = 24; in the code
  $scope.number = parseInt("24", 10);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.5/angular.min.js"></script>

<div ng-app="app" ng-controller="controller">
  <input type="number" ng-model="number"/>
</div>

Answer №3

When using input[type=number], ensure to input a numeric value and utilize angular decorators for type checking. A necessity to convert the value into a number to effectively employ the input[type=number] field.

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