Cycle. JS Angularjs

[Kadyn]

It's a full-time code that walks forward with references, but I can't figure out how to do the same cycle to walk back.

$scope.nextId = function(id, a) {
for (var i = 0; i< a.length; i++) {
  if (id == a[i].id) 
    if (i == a.length-1) { var next = '#/kitchens/'+a[0].id;  }
    else { next = '#/kitchens/'+a[i+1].id;}
}
console.log('next',next);
return next;      

}

It's non-working, backwards.

$scope.prevId = function(id, a) {

for (var i = 0; i< a.length; i++) {

if (id == a[i].id)

if (i == a[0]) { var prev = '#/kitchens/'+(a.length-1).id;  }

else { prev = '#/kitchens/'+a[i-1].id; console.log(a);}

}

return prev;

♪

It's the mark.

<a href="{{ prev }}" ng-click="prev = prevId(kitchen.id, kitchens)" style="color:green">NEXT</a>

<a href="{{ next }}" ng-click="next = nextId(kitchen.id, kitchens)" style="color:red">PREV</a>

It's a cotroller.

velesApp.controller('DetailCtrl',['$scope','$http', '$location', '$routeParams', function($scope, $http, $location, $routeParams) {

$scope.kitchenId = $routeParams.kitchenId;

var url = '/api/v1/kitchens/'+$routeParams.kitchenId;

$http.get(url).success(function(data, status, headers, config) {

$scope.kitchen = data;

});

$http.get('/api/v1/kitchens').success(function(data, status, headers, config) {

$scope.kitchens = data;

});

That's why I'm putting the binding in a separate kitchen, because I'm on the page taking out the object, not a bunch of kitchens. There's no ng-repeat in the code, binding out.

[Alberto]

Flaw in the line

if (i == a[0])

This compares the index to the variable value, in this case the object, so the condition is always false.

Rapid truth-- i == 0and inside the branch
instead (a.length-1).id - Category a[(a.length-1)].idbecause a.length-1 It's a number and he doesn't have a field. id♪

In fact, if viewed, the functions are small and can be combined to one function with a parameter

$scope.nextId = function(id, a, isNext) {
    var borderIndex=isNext? (a.length-1) : 0;
    var inc =isNext? 1 : -1;
for (var i = 0; i< a.length; i++) {
  if (id == a[i].id) {
    if (i == borderIndex) { 
      var next = '#/kitchens/'+a[a.length-1-borderIndex].id;  
    }
    else { 
      next = '#/kitchens/'+a[i+inc].id;
    }
    //так как уже нашли, нет смысла бежать по циклу дальше
    console.log('next',next);// 
    return next;      
  } 
}

}