Transmit information from the primary HTML page's controller to a directive's controller

After researching various sources such as blogs and stackoverflow, I was unable to find a solution to my specific problem of communicating between controllers and directives. Many concepts I found were for case-specific issues, but none seemed to fit my needs.

My particular issue involves sending an array from a main html file controller to a directive. Both the main html file and the directive each have their own controllers for different tasks. The array needs to be sent to the directive controller for processing, and it must be two-way bound so that changes made in either the main controller or the directive controller are reflected in both.

Answer №1

Recently, I encountered a similar situation and devised a solution to handle it efficiently. To transmit data and process it in a directive from a controller, follow these steps. Start by creating a controller in the main page and specifying an array according to your requirements...

app.controller("ctrl", function($scope) {
    $scope.scope = $scope; //this ensures the current scope is transferred to the directive
    $scope.array = [{
        "a": "vfdxvf",
        "b": "sdc"
    }, {
        "a": "vfdxvf",
        "b": "sdc"
    }, {
        "a": "vfdxvf",
        "b": "sdc"
    }, {
        "a": "vfdxvf",
        "b": "sdc"
    }];
});

In the above code, $scope.scope = $scope is used to establish a reference to the controller scope.

Next, define the directive as shown below. It will bind all the necessary values, and any modification to the array will be reflected on both ends.

Consider the following sample code..

app.directive("someDirective", function() {
    return {
        restrict: "EA",
        scope {
            array: "=", // enables two-way binding of the array
            scope: '=' // retrieves the scope of the originating controller
        },
        templateUrl: "./templates/test.html",
        controller: function($scope) {
            $scope.newArray = $scope.scope.array;
            //perform necessary operations with the array... 
        }
    }
});

Finally, for the main HTML page, include the directive like this..

<some-directive scope="scope" array="array"></some-directive>

Answer №2

Remember to use = in directive scope to bind controller variables

app.directive("myDir", function(){
  return{
    scope : {
      myArr : "="
    },
    controller : function($scope){

    },
    link : function(scope, ele, attr){
      scope.myArr.push("C");
    }
  }
});

For more information, check out https://plnkr.co/edit/pkkaEKBZVEajm5LBf9QD?p=preview

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