Can isolating scope functions through inheritance with $scope.$new bring new possibilities?

Question

Can isolating scope functions through inheritance with $scope.$new bring new possibilities?

Is it possible to achieve the automatic attribute binding functionality of an isolate scope:

scope : { someAttr: '@' }

While also maintaining the transparent scope-->parentScope property access as shown in scope.$new():

$scope.foo = 'foo';
$scope.bar = 'bar';

var childScope = $scope.new();
childScope.foo = 'childFoo';

// childScope == { foo: 'childFoo', bar: 'bar' }

Any ideas on how to create a new scope in the controller and pass attributes from a directive to that new scope?

Ultimately, I want my controller to look like:

$scope === {
           attr : << attribute from directive instance >>
    , parentKey : << transparent to parent directive's scope >>
}

javascript angularjs

Answer 1

Answer №1

If you're looking to achieve this task independently, it's actually quite straightforward. Utilize the $parse service to convert an expression into a function and then expose that function on the scope.

Angular essentially performs a similar process internally when dealing with an & scope in the directive code. The specifics can be found at this link.

To streamline this operation for properties of interest, consider creating a brief helper function utilizing the three-liner below.

/*
 * Establishes a child scope, converting property names in the whatToGetter
 * array into getters
 * @param parentScope: scope to inherit
 * @param whatToGetter: array of string properties to convert into getters 
 *                     from the parent onto the child scope
 * @returns scope new child scope
 */
function childScope(parentScope, whatToGetter) {
  var child = parentScope.$new();
  angular.forEach(whatToGetter, function(property) {
    var getter = $parse(parentScope[property]);
    child[property] = function() {
      return getter(parentScope);
    };
  });
  return child;
}

var scope = {foo: '1', bar: '2'};
var child = childScope(scope, ['bar']);
console.log(child.foo); // --> 1
console.log(child.bar()); // --> 2

Answer 2

If you're looking to achieve this task independently, it's actually quite straightforward. Utilize the $parse service to convert an expression into a function and then expose that function on the scope.

Angular essentially performs a similar process internally when dealing with an & scope in the directive code. The specifics can be found at this link.

To streamline this operation for properties of interest, consider creating a brief helper function utilizing the three-liner below.

/*
 * Establishes a child scope, converting property names in the whatToGetter
 * array into getters
 * @param parentScope: scope to inherit
 * @param whatToGetter: array of string properties to convert into getters 
 *                     from the parent onto the child scope
 * @returns scope new child scope
 */
function childScope(parentScope, whatToGetter) {
  var child = parentScope.$new();
  angular.forEach(whatToGetter, function(property) {
    var getter = $parse(parentScope[property]);
    child[property] = function() {
      return getter(parentScope);
    };
  });
  return child;
}

var scope = {foo: '1', bar: '2'};
var child = childScope(scope, ['bar']);
console.log(child.foo); // --> 1
console.log(child.bar()); // --> 2

Can isolating scope functions through inheritance with $scope.$new bring new possibilities?

Answer №1

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