从范围数组获取唯一项

Question

I have an array with JSON objects in my $scope.users which is working correctly. I'm now trying to set up a "detail" page for an individual user by filtering the users list to get a single user.

I've been close for an excruciating amount of time, and for some reason I can't find documentation or any examples of how to do what I'm doing. Maybe this isn't the correct way to do this in Angular and/or maybe I'm not searching for the right thing?

I've tried getting the object based on userId from the list in the controller, and I've tried passing a resolve in the state, but I didn't get either method to work. What is the best way to go about getting the single user with id of $stateparams.userId?

Everything else is working correctly (ie all the routing, getting the users on #/users).

// routing section of app.js
// Routing
  $urlRouterProvider.otherwise('/');
  $stateProvider
    .state('home', {
      url: '/',
      templateUrl: 'static/partials/main/home.html'
    })
    .state('users', {
      url: '/users',
      templateUrl: 'static/partials/accounts/users.html',
      controller: 'UserController'
    })
    .state('profile', {
      url: '/users/{userId}',
      templateUrl: 'static/partials/accounts/profile.html',
      controller: 'UserController'
    });


// controller.js
var rlGlobalControllers = angular.module('rlGlobalApp.controllers', []);

rlGlobalControllers.controller('UserController', function($scope, $stateParams, $filter) {
  var userId = $stateParams.userId;

  $scope.users = [
    {
      'id': 1,
      'name': 'Shadrack'
    },
    {
      'id': 2,
      'name': 'JP'
    },
    {
      'id': 3,
      'name': 'Adam'
    }
  ];

  // $scope.user = ??? 
});

# profile.html
<div ng-include src="'/static/partials/shared/header.html'"></div>

<div class="container">
  <div class="row">
    <p>users data: {{ users }}</p>
    <p>user data: {{ user }}</p>
  </div>
</div>

Answer 1

User Array.prototype.filter method to find objects satisfying criteria:

$scope.user = $scope.users.filter(function(user) {
    return user.id === userId;
})[0];

This is the most natural way to solve it. If however your users array is very large (like millions, for example (hope it's not)) then for-loop-break solution of juunas is preffered as more effective.

Answer 2

You could just do this in the controller:

for(var i = 0; i < $scope.users.length; i++){
  if($scope.users[i].id === userId){
    $scope.user = $scope.users[i];
    break;
  }
}

Answer 3

var output = [],
            keys = [];
          Array_Value.forEach(function (item) {
            var key = item["Field name"];
            if (keys.indexOf(key) === -1) {
              keys.push(key);
              output.push(item);
            }
          });
          this.Title = output;

Instead of Array_value and field name, give your data.