Pattern for setting Angular directives configuration

Question

Pattern for setting Angular directives configuration

Is there a more efficient design pattern to ensure that angular directives are rendered according to globally specified parameters? For instance, if I have a factory named "Settings" with the value "directiveColor: red", every time my directive is linked it checks for the color setting in Settings before rendering. While this currently works fine, it seems inefficient when I have multiple elements on the page each asking for the same settings repeatedly. What would you suggest?

UPDATE

Factory

app.factory('Settings', function() {
    var data = {
        //...
        directiveColor: red //set by user
    }
    //...
    GetSettings : function () {return data}
}

Directive

app.directive('wdMyDirective', ['Settings', function(Settings) {
    return {
        restrict: 'E',
        link: function(scope, elem, attr) {
            scope.data = {
                //...
                color:  Settings.GetSettings().directiveColor
            };
    };
}]);
//later "color" used in template through the scope

Although the current setup works fine, I'm concerned about the efficiency of having each directive request settings every time it renders (especially with many instances on the page using ngRepeat). Do you think there might be a better approach?

javascript angularjs angularjs-directive

Answer 1

Answer №1

Consideration must be given to two factors in this scenario. Firstly, it is acknowledged that the current approach may not be optimal, and utilizing a directive can offer a more efficient solution. To understand this concept better, read about Compile-PreLink-PostLink in angular directives. Ideally, you would want this call to occur during the Compile step if it applies universally across all directives within your application.

The second consideration pertains to the minimal overhead associated with

Settings.GetSettings().directiveColor

if the GetSettings() function simply returns a singular object (as Angular factories are designed as singletons).

In your specific case, the following implementation can be adopted:

app.factory('Settings', function() {
  var data = {
      directiveColor: 'red' //user-defined color
  }

  return {
      GetSettings : function () {return data}
  }
})

app.directive('wdMyDirective', ['Settings', function(Settings) {
  return {
    restrict: 'E',       
    compile: function(elem, attrs) {             
        var color = Settings.GetSettings().directiveColor 
        return function postLink(scope, elem, attr) {
           scope.data = {
              color:  color
           };
        }
    }
  }
}])

This method eliminates the need to declare a link property on the directive.

Answer 2

Consideration must be given to two factors in this scenario. Firstly, it is acknowledged that the current approach may not be optimal, and utilizing a directive can offer a more efficient solution. To understand this concept better, read about Compile-PreLink-PostLink in angular directives. Ideally, you would want this call to occur during the Compile step if it applies universally across all directives within your application.

The second consideration pertains to the minimal overhead associated with

Settings.GetSettings().directiveColor

if the GetSettings() function simply returns a singular object (as Angular factories are designed as singletons).

In your specific case, the following implementation can be adopted:

app.factory('Settings', function() {
  var data = {
      directiveColor: 'red' //user-defined color
  }

  return {
      GetSettings : function () {return data}
  }
})

app.directive('wdMyDirective', ['Settings', function(Settings) {
  return {
    restrict: 'E',       
    compile: function(elem, attrs) {             
        var color = Settings.GetSettings().directiveColor 
        return function postLink(scope, elem, attr) {
           scope.data = {
              color:  color
           };
        }
    }
  }
}])

This method eliminates the need to declare a link property on the directive.

Pattern for setting Angular directives configuration

Answer №1

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