Preserving the binding on ngModel while isolating the directive scope

I have a custom element that uses the directive ng-model to share its value.

The issue arises because this custom element has internal components that may affect the scope. To address this, I need to isolate the scope while still maintaining the connection with the external world through ng-model.

How can I accomplish this?

Here is the code for the directive:

angular.module('app', []).directive('myDirective', function() {
  return {
    restrict: 'E',
    require: 'ngModel',
    link: function(scope, element, attr, ngModel) {
      // perform actions using ngModel controller
    },
    replace: true,
    template: '<div><input ng-model="userInput" /></div>'
  };
});
<my-directive ng-model="prop"></my-directive>

As shown, the directive should expose the value of prop, but not reveal the variable userInput in the parent scope as defined in

<input ng-model="userInput"/>
.

How can I ensure that only prop is accessible in the parent scope?

Answer №1

Typically, ngModelController is designed to be used with directives that do not generate a new scope. The only method I've discovered to make it work with an isolate scope is by using the same name in the isolate scope:

scope: { data: '=ngModel' }  // must use 'data' here!

For further discussion on this topic, refer to my answer on SO:

You could also have the directive create a new scope utilizing scope: true. In this case, data would need to be an object property rather than a primitive: e.g., ng-model='someObj.data'. To learn more about this approach, check out the initial example on this

This approach still allows you to establish your own custom properties on the new directive child scope without affecting the parent scope. However, it's important to understand how scope prototypal inheritance functions - objects defined on the parent scope will be visible and modifiable in the directive child scope. On the other hand, primitives from the parent scope will be visible, and any attempt to modify the value of a parent primitive will result in creating a child property that conceals or overshadows the parent property with the same name. (For more details on prototypal inheritance, refer to this link.)

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