Exploring Angular 1.5: A guide to binding a transcluded template to a component's scope

Currently, I am utilizing a form component that includes common validation and saving functions. Inputs are injected into the form as transcluded templates in the following manner:

<form-editor entity="vm.entity">
        <input ng-model="vm.dirtyEntity.name" required name="nameInput">
</form-editor>

The issue at hand is that the ng-model directive is creating a dirtyEntity field within the parent vm instead of affecting the component’s scope. Even defining the component's controller as "formVm" did not resolve this problem.

Is there a way to ensure that the ng-model on the transcluded element only changes the components' scope?

Alternatively, should interaction between the transcluded template and the component controller be avoided altogether and considered incorrect practice?

javascriptangularjscomponentstransclusion

Answer №1

If you've been following along with dfsq's plunkr, here is a tailored solution just for you:

To address your issue, you can dynamically copy the necessary elements within your component and incorporate them into your form controller.

Utilize the $transclude service to dynamically transclude and attach the elements to the form in this manner:

$transclude($scope, function(clone) {
  $element.find('form').append(clone);
})

Next, ensure these elements are added to your form controller like so:

$scope.testForm.$addControl($element);

In order for this process to work seamlessly, wrap it in a timeout to allow time for the form controller instantiation before executing. Otherwise, Angular might run your code prematurely without properly instantiating the form controller.

Below is the complete code snippet, and don't forget to check out the plunkr here:

controller($scope, $element, $transclude, $timeout) {
  // Using a timeout to pause JavaScript execution for DOM update
  $timeout(function() {
    $transclude($scope, function(clone) {
      $element.find('form').append(clone);

      // Incorporate the added elements into the form
      $scope.testForm.$addControl($element);
    })
  })
}

It's worth noting that you may need to account for non-input elements when adding controls. The form controller's response to including images as controls, for instance, could be uncertain.

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