Pindakaas Pindakaas - 5 months ago 35
AngularJS Question

how to install underscore.js in my angular application?

I used yo-angular to generate my angularjs template with bootstrap/grunt/bower. I also want to use underscore in the app:

npm install underscore --save-dev


In the MainCtrl I am calling underscore.js just to see whether it works:

angular.module('yomanApp')
.controller('MainCtrl', function ($scope) {
$scope.awesomeThings = [
'HTML5 Boilerplate',
'AngularJS',
'AngularJS'
];

_.each([1,2,3],console.log);
});


When I run the application with Chrome I get this errmsg in the console:

ReferenceError: _ is not defined
at new <anonymous> (http://localhost:9000/scripts/controllers/main.js:18:5)
at invoke (http://localhost:9000/bower_components/angular/angular.js:4203:17)
at Object.instantiate (http://localhost:9000/bower_components/angular/angular.js:4211:27)
at http://localhost:9000/bower_components/angular/angular.js:8501:28
at link (http://localhost:9000/bower_components/angular-route/angular-route.js:975:26)
at invokeLinkFn (http://localhost:9000/bower_components/angular/angular.js:8258:9)
at nodeLinkFn (http://localhost:9000/bower_components/angular/angular.js:7768:11)
at compositeLinkFn (http://localhost:9000/bower_components/angular/angular.js:7117:13)
at publicLinkFn (http://localhost:9000/bower_components/angular/angular.js:6996:30)
at $get.boundTranscludeFn (http://localhost:9000/bower_components/angular/angular.js:7135:16) <div ng-view="" class="ng-scope">


After this error I added the module to the app config:
'use strict';

/**
* @ngdoc overview
* @name yomanApp
* @description
* # yomanApp
*
* Main module of the application.
*/
angular
.module('yomanApp', [
'ngAnimate',
'ngCookies',
'ngResource',
'ngRoute',
'ngSanitize',
'ngTouch',
'underscore'

])
.config(function ($routeProvider) {
$routeProvider
.when('/', {
templateUrl: 'views/main.html',
controller: 'MainCtrl'
})
.when('/about', {
templateUrl: 'views/about.html',
controller: 'AboutCtrl'
})
.when('/accordeon', {
templateUrl: 'views/accordeon.html',
controller: 'IssuesCtrl'
})
.otherwise({
redirectTo: '/'
});
});


Now I am getting this error:

Uncaught Error: [$injector:modulerr] Failed to instantiate module yomanApp due to:
Error: [$injector:modulerr] Failed to instantiate module underscore due to:
Error: [$injector:nomod] Module 'underscore' is not available! You either misspelled the module name or forgot to load it. If registering a module ensure that you specify the dependencies as the second argument.


Last thing I tried was adding it to the index.html:

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


This results in the same error as above. Also get a 404 for the underscore.js?? Is this a grunt configuration issue or anything else?

Answer

I tend to just use a constant for this type of thing. It's a simple approach and allows you to explicitly state your dependencies in your application.

Install with bower:

bower install underscore --save

Load the library before angular:

<script src="bower_components/underscore/underscore.js"></script>
<script src="bower_components/angular/angular.js"></script>
<script src="app/scripts/app.js"></script>

Define it as a constant (in app/scripts/app.js for example):

application.constant('_',
    window._
);

Then in your controllers/services:

application.controller('Ctrl', function($scope, _) {
    //Use underscore here like any other angular dependency
    var stooges = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}];
    $scope.names = _.pluck(stooges, 'name');
});