Needed factory working in angular js - html

Question

Actually i was new to angular js i am trying to call my factory operation into controller i dont know where i am going wrong
and my js goes here
app.factory("myFactory",function(){
var something = {};
something.getsum = function() {
$scope.service = " heloo people"
}
return something;
});
app.controller("helloController", function($scope,myFactory) {
$scope.clickme = function() {
$scope.service=myFactory.getsum();
}
});
and my html goes here
<div ng-controller="hello controller">
<button ng-click="clickme"></button>
<h2>{{service}}</h2>
</div>
and my config goes here:
$urlRouterProvider.otherwise("/index/utilise");
$stateProvider
.state('index', {
abstract: true,
url: "/index",
templateUrl: "display.html",
controller:'mainController',
controllerAs: "parentCtrl",
})
.state('index.sample', {
url: "/home",
templateUrl: "content/sample.html",
})
.state('index.utilise', {
url: "/utilise",
templateUrl: "content/utilise.html",
})
})

Answer 1

First issue is that to use the myFactory factory in your controller you would need to inject it into the controller via dependency injection:
app.controller("helloController", function($scope, myFactory) {
$scope.clickme = function() {
$scope.service = myFactory.getsum();
}
});
Second issue you would not use $scope in the myFactory factory method getsum(), you would simply return the value you need:
app.factory("myFactory",function(){
var something = {};
something.getsum = function() {
return " heloo people";
}
return something;
});
Third issue is ng-click was not actually execute controller function clickme as there was parenthesis () as you would with any JavaScript function. It should be ng-click="clickme()" to actually call the function on the controller:
<div ng-controller="helloController">
<button ng-click="clickme()"></button>
<h2>{{service}}</h2>
</div>
Finally, it's unclear what the structure of your application based on the ui-router configuration your provided. With ui-router you wouldn't really have the need to use ng-controller as you can specify what controller any given view should be using. I've created multiple Plunkers, one and two, demonstrating the factory functionality with and without controllers specified for child routes. This should be more than enough to demonstrating calling a controller function in different situations.
Hopefully that helps!