How do I pass a value from `$rootScope` to `ng-model` in AngularJS?

I have an object stored in the root scope and I want to display some values in form inputs.

I attempted the following:

<input type="number" ng-model="$root.order.id" class="form-control" id="orderNumber" />

However, this does not seem to be working.

How should I pass the value into the ng-model?

Any help would be greatly appreciated.

Answer №1

There is no need to attach the $root to the variable in Angular. The flow of scope in Angular first searches in the local scope for the variable, if not found it then searches in the $scope.parent and the rootScope if there is a higher level parent that does not match anything else, then it searches there.

http://example.com

In this example snippet, you can see how the root scope is used.

Controller:

app.controller('MainCtrl', ["$scope", "$rootScope", function($scope, $rootScope) {
  $rootScope.varRoot = {
    element: "John"
  };
}]
);

HTML:

<body ng-controller="MainCtrl">
    <p>Hello {{varRoot.element}}!</p>
    <input type="text" ng-model="varRoot.element">
  </body>

Answer №2

To set the order ID, simply reference the name like this:

$rootScope.purchase.id = 5;

<input type="number" ng-model="purchase.id"  class="form-control" id="purchaseNumber" />

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