Can I make scope extend an object in angularjs?

Question

Say I write an app like this:

<script>

myArray=<?php echo $array;?>;
app={
    myArray:myArray,
    myIndex:myArray.length-1,
    back:function(){this.myIndex--;console.log("You clicked back");},
    forward:function(){this.myIndex++}
}
</script>

Now I want to add a UI so I decide to use angularJS. So I write this:

<div ng-app="myApp">
    <div ng-controller="AppCtrl">
        <div ng-repeat="value in myArray | slice:myIndex:myIndex+1">
            <div ng-cick="back()">Back</div>
            <div ng-bind="value"></div>
            <div ng-cick="forward()">Forward</div>
        </div>
    </div>
</div>

Also I got this

var myApp=angular.module('myApp', [])

myApp.filter('slice', function() {
  return function(arr, start, end) {
    return arr.slice(start, end);
  };
});

myApp.controller("AppCtrl",function($scope){
    $.extend($scope,app);
})

Then I click the back button, and the console logs "You clicked back", but the value does not change. Why doesn't JQuery extend work in this situation and how can I get this to work correctly?

Answer 1

$.extend will work fine.. But.. You don't really need it.. read/watch this.

To fix your problem... just do this:

  myApp.controller("AppCtrl",function($scope){
      $scope.app = app;
  })

and.

  <div ng-controller="AppCtrl">
    <div ng-repeat="value in app.myArray | slice:app.myIndex:app.myIndex+1">
        <button ng-click="app.back()">Back</button>
        <div>{{value}}</div>
        <button ng-click="app.forward()">Forward</button>
    </div>
  </div>

Hope that points you in the right direction.

update

One solution would be to use the controller as syntax... so

myApp.controller("AppCtrl",function(){
    angular.extend(this,app);
})

and

  <div ng-controller="AppCtrl as app">
    <div ng-repeat="value in app.myArray | slice:app.myIndex:app.myIndex+1">
        <button ng-click="app.back()">Back</button>
        <div ng-bind="value"></div>
        <button ng-click="app.forward()">Forward</button>
    </div>
  </div>

In the first example $scope.app has context (because its the owner of forward,back etc that you mixed in).