What is the best way to send parameters to an angular service or factory?

This Plunker demonstration is a great visual guide: http://plnkr.co/edit/y3uacaQSc1MbrWKfb0At?p=preview

Here's the code snippet for reference:

var app = angular.module('plunker', []);

app.controller('MainCtrl', function($scope,testFactory) {
  $scope.name = 'World';
  var test_var = "iceland";
  $scope.testFunction = testFactory.testFunction;

});

app.service('testFactory',function(){

  this.testFunction = function(){
    alert(test_var);
  };

})

In the HTML section:

<body ng-controller="MainCtrl">
    <p ng-click="testFunction()">Hello {{name}}!</p>

  </body>

The current issue, as observed in the Plunkr example, is that `test_var` is undefined which is expected as it has not been defined. To resolve this, there is an intention to pass it from the controller without executing the function. However, directly assigning `scpe.testFunction = testFactory.testFunction(test_var);` results in immediate execution due to the parentheses. The goal here is to only pass `test_var` without triggering the function. How can this be achieved?

Answer №1

Enclose the call within a function to ensure that

testFactory.testFunction(test_var)
is executed only when $scope.testFunction() is called...

var app = angular.module('plunker', []);

app.controller('MainCtrl', function($scope,testFactory) {
  $scope.name = 'World';
  var test_var = "iceland";
  $scope.testFunction = function() {
    testFactory.testFunction(test_var);
  };
});

app.service('testFactory',function(){

  this.testFunction = function(test_var){
    alert(test_var);
  };

})

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