Linking two directives in AngularJS to the scope models of a parent controller

In my form controller, I have 2 object models: model1 - {name:"foo"} and model2 - {name:"model2"}. To implement this, I created 2 directives with isolated scopes. One directive binds only to elements and uses model1, while the other binds only to attributes and uses model2.

The structure is as follows:

 <div myattibute="model2">
   <mytag my-model="model"></mytag>
 </div>

The attribute-only directive does not have a template, whereas the tag directive has a template.

The issue I am facing is that the model in mytag directive is returning undefined.

1. Can someone identify the problem and provide an explanation on Plnkr?

http://plnkr.co/edit/Q23XqY?p=preview


Partial Solution: I managed to get it working by adding an empty div template with just ng-transclude for the myattribute directive. However, I would like this attribute directive to be used on any element, such as div or span. Here is the solution: http://plnkr.co/edit/z0M5ys?p=preview

2. How does ng-transclude impact scope inheritance?
3. Is it possible to create this attribute with pure business logic without any markup?

Answer №1

Avoiding isolate scopes is generally recommended, unless there are specific cases where they are necessary. Using $scope.$watch to bind to expressions in attributes can help simplify your directives:

$scope.$watch(attrs.myModel, function(newValue, oldValue) {})

$scope.$watch(attrs.myattribute, function(newValue, oldValue) {})

By sharing the parent scope or creating a child scope using { scope: true }, you can effectively handle binding within your directives.

If interested, here is an example solution you can refer to: http://plnkr.co/edit/mm2q67?p=preview

It's worth noting that while your myTag directive can utilize an isolate scope if necessary, the myattribute directive should avoid it to maintain scope inheritance for myTag.

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