Is there a way to decode/compile/interpret the data within nested HTML tags within my AngularJS directives?

How can I process/compile/resolve the contents of enclosed HTML in my directives.

The specific directive being discussed is:

angular.module('transclude', [])
 .directive('heading', function(){
    return {
      restrict: 'E',
      replace: true,
      transclude: true,
        scope: {
            cls: '@'
        },
      template: '<h1 ng-transclude></h1>'
    };
});

and here is the accompanying HTML code:

<div ng-app="transclude">
  <div ng-controller="Ctrl">
      <heading cls="beans">
          <span class="{{cls}}">{{cls}}</span>
      </heading>
  </div>
</div>

A simplified plunker has been created to illustrate the issue: http://jsfiddle.net/ys9fekss/

It can be seen that I am expecting the HTML within my directive to have the {{cls}} tags replaced with the literal string 'beans' both as an attribute and inside the content.

I've been grappling with this problem for quite some time - exploring scoping, compiling, link functions, and more, but nothing seems to work.

My objective is to create a validator directive capable of wrapping any type of field.

What steps should I take to enable Angular to interpret the HTML within that field?

UPDATE: As I continue to face challenges with this issue, I have shared the actual modified HTML (as per the solution provided below) demonstrating the problem associated with the shared scope:

http://jsfiddle.net/hwsqsxf3/

In the example above, setting scope: true eliminates repeated values but prevents the parsing of the name="" attribute!

What I require is to accomplish both of these simultaneously!

Answer №1

Maybe you should consider a different approach, such as using a directive with shared scope (not isolated like yours) but with the ability to create new values in the scope. This way, you can utilize the directive multiple times in your application with different values for each instance:

<div ng-app="transclude">
  <div ng-controller="Ctrl">
      <heading cls="beans" target="tar">
          <span class="{{tar}}">{{tar}}</span>
      </heading>
  </div>
</div>

// The target attribute will represent your scope value (there's no need to even declare it in the controller)

function Ctrl($scope) {
  $scope.foo = 'Bar';
}

angular.module('transclude', [])
 .directive('heading', function(){
    return {
        restrict: 'E',
        replace: true,
        transclude: true,
        template: '<h1 ng-transclude></h1>',
        link: function(scope, el, attr){
            scope[attr.target] = attr.cls;
        }
    };
});

Take a look at this example on JSFiddle.

Answer №2

After much guidance from Strife86 and stumbling upon this insightful blog, I believe I've managed to crack the code to my own dilemma.

You can find my solution presented here. It may not be the most graceful approach – whether it's due to limitations of directives or my own shortcomings remains unclear. If there exists a more elegant method, I would greatly appreciate any suggestions.

Check out the working demonstration on JsFiddle.

The essence of the directive's script is as follows:

.directive('validatingField', ['$compile', function($compile) {
    return {
        restrict: 'EA',
        transclude: true,
        scope: {
            label: '@',
            field: '@',
            labelWidth: '@',
            fieldWidth: '@',
            error: '=',
            ngModel: '='
        },
        templateUrl: "validating-field.html",
        link: function (scope, element, attrs, ctrl, transcludeFn) {

          transcludeFn(scope, function(clone, scp) {
            element.find('ng-transclude').replaceWith(clone);
          });

        }
    };
}]);

Figuring out how to bind ngModel proved to be the most challenging aspect, and I am slightly dissatisfied with the repetitive nature of certain elements. Nevertheless, after investing 1.5 days into this endeavor, I am hesitant to delve into further experimentation at the moment!

Answer №3

It appears that I have found a solution, although it may not be the most elegant:

http://jsfiddle.net/ywksgocm/

This solution incorporates two-way binding of the model, as well as inherited and augmented parent scope (allowing for arbitrary controller scope access).

The crucial element in this solution is:

myScope.$new();

If you have any suggestions for improvement, please feel free to share them with me.

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