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How do I use underscore library inside angularjs controllers?

On this post: AngularJS limitTo by last 2 records somebody suggested to assign an _ variable to the rootScope so that the library will be available to all the scopes within the app.

But I'm not clear where to do it. I mean should it go on the app module declaration? i.e: 

var myapp = angular.module('offersApp', [])
            .config(['$rootScope', function($rootScope) { }

But then where do I load underscore lib? I just have on my index page the ng-app directive and script reference to both the angular-js and underscore libs?

index.html:

<head>
</head>
<body ng-app="offersApp">
...
<script src="//ajax.googleapis/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="scripts/vendor/angular.js"></script>
<script src="scripts/vendor/underscore.js"></script>
...

How do I achieve this?

How do I use underscore library inside angularjs controllers?

On this post: AngularJS limitTo by last 2 records somebody suggested to assign an _ variable to the rootScope so that the library will be available to all the scopes within the app.

But I'm not clear where to do it. I mean should it go on the app module declaration? i.e: 

var myapp = angular.module('offersApp', [])
            .config(['$rootScope', function($rootScope) { }

But then where do I load underscore lib? I just have on my index page the ng-app directive and script reference to both the angular-js and underscore libs?

index.html:

<head>
</head>
<body ng-app="offersApp">
...
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="scripts/vendor/angular.js"></script>
<script src="scripts/vendor/underscore.js"></script>
...

How do I achieve this?

  • javascript
  • angularjs
  • underscore.js
Share Improve this question edited May 23, 2017 at 12:17 CommunityBot 11 silver badge asked Feb 19, 2013 at 21:59 PabloPablo 3,4677 gold badges46 silver badges66 bronze badges 4
  • well what did you try and did not work ? – mpm Commented Feb 19, 2013 at 22:01
  • Well, I don't know where to start. How do I link any king of <script> files with the angularjs part? (controllers, services, directives...etc). Is there any require('...') like expression? – Pablo Commented Feb 19, 2013 at 22:03
  • just declare the proper script tag with underscore in your html file , like you did with angular or jquery. – mpm Commented Feb 19, 2013 at 22:05
  • Will it be available automatically under the _ character?? How?? – Pablo Commented Feb 19, 2013 at 22:11
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6 Answers 6

Reset to default 231

When you include Underscore, it attaches itself to the window object, and so is available globally.

So you can use it from Angular code as-is.

You can also wrap it up in a service or a factory, if you'd like it to be injected:

var underscore = angular.module('underscore', []);
underscore.factory('_', ['$window', function($window) {
  return $window._; // assumes underscore has already been loaded on the page
}]);

And then you can ask for the _ in your app's module:

// Declare it as a dependency of your module
var app = angular.module('app', ['underscore']);

// And then inject it where you need it
app.controller('Ctrl', function($scope, _) {
  // do stuff
});

I have implemented @satchmorun's suggestion here: https://github.com/andresesfm/angular-underscore-module

To use it:

  1. Make sure you have included underscore.js in your project

    <script src="bower_components/underscore/underscore.js">

  2. Get it:

    bower install angular-underscore-module

  3. Add angular-underscore-module.js to your main file (index.html)

    <script src="bower_components/angular-underscore-module/angular-underscore-module.js"></script>

  4. Add the module as a dependency in your App definition

    var myapp = angular.module('MyApp', ['underscore'])

  5. To use, add as an injected dependency to your Controller/Service and it is ready to use

    angular.module('MyApp').controller('MyCtrl', function ($scope, _) {
...
//Use underscore
_.each(...);
...

I use this:

var myapp = angular.module('myApp', [])
  // allow DI for use in controllers, unit tests
  .constant('_', window._)
  // use in views, ng-repeat="x in _.range(3)"
  .run(function ($rootScope) {
     $rootScope._ = window._;
  });

See https://github.com/angular/angular.js/wiki/Understanding-Dependency-Injection about halfway for some more info on run.

You can also take a look at this module for angular

https://github.com/floydsoft/angular-underscore

If you don't mind using lodash try out https://github.com/rockabox/ng-lodash it wraps lodash completely so it is the only dependency and you don't need to load any other script files such as lodash.

Lodash is completely off of the window scope and no "hoping" that it's been loaded prior to your module.

you can use this module -> https://github.com/jiahut/ng.lodash

this is for lodash so does underscore

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