Tips for retrieving the values configured within an Angular JS template directive like "ng-class."

Question

Tips for retrieving the values configured within an Angular JS template directive like "ng-class."

^{Background: I am in search of a pure Angular JS solution to address this issue, utilizing the framework’s functionality rather than creating workarounds that involve searching for ng-class values within the DOM.}

The template structure is as follows:

<div class="stuff" ng-class="{ 0: 'default', 1: 'thing_1', 2: 'thing_2', 3: 'thing_3', 4: 'thing_4', 5: 'thing_5' }[thingType]">

In my controller, I can assign a value like so, which will add thing_2 to the stuff class of the DIV:

$scope.thingType = 2;

However, I am interested in accessing the values set in the ng-class template directly within the controller. While I understand this data is parsed as JSON internally by Angular, it would be beneficial if the controller could autonomously count the values defined in the template.

My objective is to extract the ng-class JSON object into the controller. Ideally, even if I were to introduce a new class option indexed from 0 to 5 within the CSS JSON in the template, the controller should automatically count these keys without manual adjustments in both the template and controller.

Despite differing opinions on this strategy, I am seeking a straightforward and native Angular solution to achieve this. Are there any clean methods to accomplish this task? Can this be achieved solely using Angular's logic, avoiding the need for external DOM searches with directives or other makeshift solutions? My focus is on implementing the cleanest and most efficient Angular-native approach available.

javascript angularjs

Answer 1

Answer №1

<div ng-switch="myJson">

$scope.myJson = { 0: 'default', 1: 'thing_1', 2: 'thing_2', 3: 'thing_3', 4: 'thing_4', 5: 'thing_5' }[thingType];

Now you have incorporated it into both your template and controller, providing flexibility for customization.

Alternatively, consider developing a custom directive that captures ng-switch, saves it in a service for the controller to access and interpret as JSON:

<div id="myDiv1" ng-switch="{ 0: 'default', 1: 'thing_1', 2: 'thing_2', 3: 'thing_3', 4: 'thing_4', 5: 'thing_5' }[thingType]"></div>

angular.module('myApp', [])
  .service('myService', [function() {

    var data = {};

    this.set = function(key, value) {
      data[key] = value;
    };

    this.get = function(key) {
      return key ? data[key] : data;
    };
  }])
  .directive('myDirective', ['myService', function(myService) {

    return {
      restrict: 'A',
      link: function(scope, element, attrs) {

        var switchValue = element.getAttribute('ng-switch');

        myService.set(element.getAttribute('id'), switchValue);
      }
    }
  }])
  .controller('MyCtrl', ['myService', function(myService) {

    var id = 'Use a common id for your DIV which is also available here';

    // You can now access and utilize the switch values as JSON while maintaining the template structure
    var switchValues = JSON.parse(myService.get(id));
  }]);

Answer 2

<div ng-switch="myJson">

$scope.myJson = { 0: 'default', 1: 'thing_1', 2: 'thing_2', 3: 'thing_3', 4: 'thing_4', 5: 'thing_5' }[thingType];

Now you have incorporated it into both your template and controller, providing flexibility for customization.

Alternatively, consider developing a custom directive that captures ng-switch, saves it in a service for the controller to access and interpret as JSON:

<div id="myDiv1" ng-switch="{ 0: 'default', 1: 'thing_1', 2: 'thing_2', 3: 'thing_3', 4: 'thing_4', 5: 'thing_5' }[thingType]"></div>

angular.module('myApp', [])
  .service('myService', [function() {

    var data = {};

    this.set = function(key, value) {
      data[key] = value;
    };

    this.get = function(key) {
      return key ? data[key] : data;
    };
  }])
  .directive('myDirective', ['myService', function(myService) {

    return {
      restrict: 'A',
      link: function(scope, element, attrs) {

        var switchValue = element.getAttribute('ng-switch');

        myService.set(element.getAttribute('id'), switchValue);
      }
    }
  }])
  .controller('MyCtrl', ['myService', function(myService) {

    var id = 'Use a common id for your DIV which is also available here';

    // You can now access and utilize the switch values as JSON while maintaining the template structure
    var switchValues = JSON.parse(myService.get(id));
  }]);

Answer 3

Answer №2

This seems a bit confusing to me, as the ng-class directive doesn't seem to function in this particular way:

<div class="stuff" ng-class="{ 0: 'default', 1: 'thing_1', 2: 'thing_2', 3: 'thing_3', 4: 'thing_4', 5: 'thing_5' }[thingType]">

Typically, with ng-class, you provide an object where you specify the class name and then assign an expression (often a condition), such as demonstrated below (using two classes):

//this code will apply the 'default' class when isActive is true and 'thing_1' if isActiveThing1 is true
<div ng-class="{default: isActive, thing_1: isActiveThing1}"></div>

Answer 4

This seems a bit confusing to me, as the ng-class directive doesn't seem to function in this particular way:

<div class="stuff" ng-class="{ 0: 'default', 1: 'thing_1', 2: 'thing_2', 3: 'thing_3', 4: 'thing_4', 5: 'thing_5' }[thingType]">

Typically, with ng-class, you provide an object where you specify the class name and then assign an expression (often a condition), such as demonstrated below (using two classes):

//this code will apply the 'default' class when isActive is true and 'thing_1' if isActiveThing1 is true
<div ng-class="{default: isActive, thing_1: isActiveThing1}"></div>

Tips for retrieving the values configured within an Angular JS template directive like "ng-class."

Answer №1

Answer №2

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