Create a feature where radios within one controller can toggle the visibility of an element in a separate controller

I am currently working on establishing a connection between different controllers to control the visibility of a div based on radio button selection in another controller.

With some assistance, I have made progress in getting this functionality partially working. Here is what has been accomplished so far:

I created a factory to facilitate communication between the two controllers. Within this factory, there is an update function that is triggered by ng-change to update the string with the newly selected value.

.factory("sessionCheck", function() {
    var sessionCheck = {};
    var update = function (index) {
        console.log(index);
        sessionCheck = index; 
        return sessionCheck;
    };
    return { update: update }

In the first controller, the function is invoked when ng-change occurs on the radio buttons:

//bring in session check, (injected above)
$scope.updateChecker = sessionCheck;

$scope.sessionChange = function(){
    $scope.updateChecker.update($scope.opMeasure);
};

The issue lies in retrieving this updated information in another controller and utilizing it to either hide or show a particular div.

It would be beneficial if a default value, such as "1", could be returned prior to the ng-change event. Additionally, it would be ideal to find a more straightforward approach that directly reads from the model of the radio buttons (opMeasure) instead of relying on the ng-change event trigger.

I have been grappling with this problem for quite some time now and any guidance or suggestions would be greatly appreciated. Thank you!

Answer №1

Yesterday, I provided a solution to a similar issue. The key is to share a common data object reference among your controllers using a shared service.

Check out the DEMO here

JAVASCRIPT

angular.module('demo', [])

  .factory('SessionCheck', function() {
    var sessionCheck = {
      data: {}
    };

    // default value
    sessionCheck.data.selection = 1;

    return sessionCheck;
  })

  .controller('Ctrl1', function($scope, SessionCheck) {
    $scope.data = SessionCheck.data;
  })

  .controller('Ctrl2', function($scope, SessionCheck) {
    $scope.data = SessionCheck.data;
  });

HTML

<div ng-controller="Ctrl1">
  <h1>Controller 1</h1>
  Measurement:
  <select ng-model="data.selection">
    <option value="">-- Select</option>
    <option value="1">1 Meter</option>
    <option value="2">2 Meters</option>
    <option value="3">3 Meters</option>
  </select>
</div>

<div ng-controller="Ctrl2">
  <h1>Controller 2</h1>
  <div ng-show="data.selection == 1">
    Showing items for 1 Meter
  </div>

  <div ng-show="data.selection == 2">
    Showing items for 2 Meters
  </div>

  <div ng-show="data.selection == 3">
    Showing items for 3 Meters
  </div>
</div>

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