Obtain the dynamic $scope variable within the HTML structure

When creating numerous directives with dynamic scope variables initialized in the link functions, accessing these values within the directive templates can get tricky. For example:

// 
link: function(scope, ele, attr){
  scope.key = scope.somevar + 'something_else';
  scope[scope.key] = 'the_value';
}
//

The desired access via scope.key in the directive templates proves challenging without a workaround. One option is to create a function call like:

html

<div ng-if="scope(key)"> something </div>

js

scope.scope = function(key) {
  return scope[key];
}

This method requires repetitive copying into all the directives, which may not be the most efficient solution. Alternatively, considering assigning the getter function to $rootScope for global access raises questions on binding it to or passing it into the current directive's scope.

What would be the optimal approach to resolve this issue?

Answer №1

When working with an Angular template, the this keyword refers to the current scope or evaluation context. Utilizing bracket notation on the this object allows you to achieve your desired outcome:

<div ng-if="this[key]"> something </div>

Answer №2

Utilize the bindToController option within your directive

JavaScript

bindToController: true,
controller: 'MyController',
controllerAs: 'ctrl',
link: function(scope, ele, attr){
  scope.ctrl.key = scope.somevar + 'something_else';
  scope.ctrl[scope.ctrl.key] = 'the_value';
}

HTML

<div ng-if="ctrl[ctrl.key]"> something </div>

Explore this codepen for reference:

Answer №3

If you provide the full code, it will make it easier to troubleshoot. It seems like you can simply define a function within your scope to access the value:

scope.retrieveValue = function() {
    return scope[scope.key];
}

Afterwards, in your HTML file:

<div ng-if="retrieveValue()"> something </div>

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