Transferring a JSON object along with a function to the controller of another directive

Question

Transferring a JSON object along with a function to the controller of another directive

I am facing a challenge in sending a JSON object with a function template from app.controller to another directive controller. I have chosen to pass this variable as an attribute of the inner directive's element. The issue arises when attempting to access the object within $attr.valueAtt in my directive controller, as it only returns "[object Object]".

This is my code snippet:

var value = (
  [{
     functionLabel:'Fun', 
     functionTemplate: function(param1,param2){
       alert(param1);
     }, 
     functionParams: ['PARAM1','PARAM2']
  }]);

Subsequently, I include it in the controller as an attribute of the directive element:

angular.element(document.getElementById('space-for-modals'))
         .append($compile("<modal-dialog visible='true' data-backdrop='static' valueAtt='"+value+"'></<modal-dialog>")($scope));

When trying to retrieve "value" in my directive controller:

 $scope.functions=  $attrs.valueAtt;

However, within $scope.functions, only "[object Object]" is stored. Is there a technique available to successfully send a function template from one controller to another for future calling?

javascript json angularjs

Answer 1

Answer №1

Issue arises when the JavaScript conversion of value to a string results in "[object Object]" instead of the intended object reference. To resolve this, store the object in the scope and then utilize its name in the HTML attribute. Consider this approach:

  var scope2 = scope.$new();
  scope2.foo = [{
     label:'Fun', 
     fn: function(param1, param2){
       alert("Callback function says: " + param1)
     }, 
     params: ['PARAM1', 'PARAM2']
  }];

  angular.element(document.getElementById('space-for-modals'))
     .append($compile("<modal-dialog visible='true' data-backdrop='static' value-att='foo'>Modal dialog</<modal-dialog>")(scope2));

Within the modal dialog link function, the value-attr can be dereferenced to obtain foo:

link: function(scope, elem, attrs) {
  scope.functions = scope[attrs.valueAtt];
}

In the dialog controller, access the functions member. Note that it will only be available after the link function has been executed, necessitating the use of a watch:

  $scope.$watch('functions', function(functions) {
    if (functions == null)
      return;
    var ft = functions[0];
    ft.fn.apply(null, ft.params);
  });

Check out the demo.

The practice of compiling HTML dynamically may seem unconventional. Why not opt for a directive template? If positioning content in another DOM level is the goal, consider utilizing a service for communication or implementing an isolate scope to streamline attribute binding.

A service could facilitate communication by storing a callback function triggered by the controller:

.service('modalService', [function() {
  var proxy = function(message) {
    proxy.callback(message);
  };
  proxy.callback = function() {};
  return proxy;
}])

By injecting this into both dialog and trigger controllers, seamless communication between them becomes possible. The modal dialog should replace the callback with its specific function. Refer to another demo for illustration.

Answer 2

Issue arises when the JavaScript conversion of value to a string results in "[object Object]" instead of the intended object reference. To resolve this, store the object in the scope and then utilize its name in the HTML attribute. Consider this approach:

  var scope2 = scope.$new();
  scope2.foo = [{
     label:'Fun', 
     fn: function(param1, param2){
       alert("Callback function says: " + param1)
     }, 
     params: ['PARAM1', 'PARAM2']
  }];

  angular.element(document.getElementById('space-for-modals'))
     .append($compile("<modal-dialog visible='true' data-backdrop='static' value-att='foo'>Modal dialog</<modal-dialog>")(scope2));

Within the modal dialog link function, the value-attr can be dereferenced to obtain foo:

link: function(scope, elem, attrs) {
  scope.functions = scope[attrs.valueAtt];
}

In the dialog controller, access the functions member. Note that it will only be available after the link function has been executed, necessitating the use of a watch:

  $scope.$watch('functions', function(functions) {
    if (functions == null)
      return;
    var ft = functions[0];
    ft.fn.apply(null, ft.params);
  });

Check out the demo.

The practice of compiling HTML dynamically may seem unconventional. Why not opt for a directive template? If positioning content in another DOM level is the goal, consider utilizing a service for communication or implementing an isolate scope to streamline attribute binding.

A service could facilitate communication by storing a callback function triggered by the controller:

.service('modalService', [function() {
  var proxy = function(message) {
    proxy.callback(message);
  };
  proxy.callback = function() {};
  return proxy;
}])

By injecting this into both dialog and trigger controllers, seamless communication between them becomes possible. The modal dialog should replace the callback with its specific function. Refer to another demo for illustration.

Answer 3

Answer №2

I have a feeling that the issue lies in the conversion process, but I'm unable to store the "value" in a static variable within the main $scope. I need to access this "value" in order to invoke a modal window with generic functionality that relies on functions stored within it. That's why I opted to pass the "value" as an attribute. Is there another way to store the "value" along with its functions in the view or pass it directly to the directive controller?

Answer 4

I have a feeling that the issue lies in the conversion process, but I'm unable to store the "value" in a static variable within the main $scope. I need to access this "value" in order to invoke a modal window with generic functionality that relies on functions stored within it. That's why I opted to pass the "value" as an attribute. Is there another way to store the "value" along with its functions in the view or pass it directly to the directive controller?

Transferring a JSON object along with a function to the controller of another directive

Answer №1

Answer №2

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