Utilizing exported functions from an Angular factory or directive for future use

After completing my first web application using Angular.js, I incorporated a module to handle interactive graphics (specifically seat maps) with Raphael. This included creating directives for handling the Raphael functionality.

angular.module('raphael', [])
.factory('fillData', function() {
  return function(paper, data) {
    var canvas = $(paper.canvas);

    // Code for filling in the data...

    canvas.on('click', '[id]', function(e) {
      this.classList.toggle('selected');
    });
  };
})
.directive('raphael', ['fillData',
  function(fillData) {
    return {
      scope: {
        raphael : '&',
        seatData: '&'
      },
      link: function(scope, element, attrs) {
        var paper = null;

        var updateSeatData = function() {
          if(scope.seatData()) fillData(paper, scope.seatData());
        };

        scope.$watch(scope.raphael, function() {
          element.empty();
          paper = new Raphael(element[0], '100%', '100%');
          paper.add(scope.raphael());
          updateSeatData();
        });

        scope.$watch(scope.seatData, function() {
          updateSeatData();
        });
      }
    };
  }
]);

While everything was working well initially, I encountered challenges when trying to interact with the vector on a deeper level. For example, determining the count of selected seats or deselection triggered by an external element outside the svg container.

I'm struggling to find a suitable way to implement these additional features. Any thoughts or suggestions? Is there an alternative approach for integrating a secondary library within Angular?

Answer №1

It appears that you are looking to create a directive with internal state that can be accessed from external sources such as other directives or services. One approach could be to utilize a service as the holder of this state, allowing your directive to access it without directly storing the state itself.

Answer №2

Can you explain what you mean by a more practical way of setting it up? It seems fine to me, although I think it would be better to bind to the attribute seatData instead of passing a function like

scope: {
  seatData: '='
}

Then we can monitor it like this

scope.$watch('seatData', function() {
  fillData(paper, scope.seatData);
});

Do you see an issue with this approach or am I missing something?

Answer №3

Alright, I've figured out a solution by tapping into the parent scope and placing crucial functions there.

I made an adjustment in the fillData factory by adding this line:

return {
  deselectAll: function() { ... }
};

Furthermore, I modified the updateSeatData method like so:

var updateSeatData = function() {
  if(scope.seatData) {
    var result = fillData(paper, scope.seatData[scope.level]);
    angular.extend(scope.$parent, result);
  }
};

p.s. I'm open to any additional suggestions...

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