Inject module dependency (like plugin) only if needed AngularJS

问题

I have 2 pages (I don't use the angular's routing - This constraint).

In one of them I want to use the directive ui-grid like in this demo:

var app = angular.module('myApp', ['ui.grid']);
app.controller('mainCtrl', function($scope) {
  $scope.myData = [
    {
        "firstName": "Cox",
        "lastName": "Carney",
        "company": "Enormo",
        "employed": true
    },
    {
        "firstName": "Lorraine",
        "lastName": "Wise",
        "company": "Comveyer",
        "employed": false
    },
    {
        "firstName": "Nancy",
        "lastName": "Waters",
        "company": "Fuelton",
        "employed": false
    }
  ];
});

<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.26/angular.js"></script>
<script src="http://ui-grid.info/release/ui-grid-unstable.js"></script>
<link rel="stylesheet" href="http://ui-grid.info/release/ui-grid-unstable.css" type="text/css">

<div ng-app="myApp">
  <div ng-controller="mainCtrl">
    <div id="grid1" ui-grid="{ data: myData }" class="grid"></div>
  </div>
</div>

My question is if there is a way to not inject the ui-grid dependency to the app in any case but only when I need it.

Something like:

app.controller('mainCtrl', function($scope) {
   app.$inject('ui-grid');
});

Update

I tried to do:

var ui_grid = $injector.get('ui-grid');

But I've got an error:

Unknown provider: ui-gridProvider <- ui-grid

http://errors.angularjs.org/1.2.26/$injector/unpr?p0=ui-gridProvider%20%3C-%20ui-grid

回答1:

Core Angular API does not provide this feature. ocLazyLoad is the popular library for lazy loading of modules and components in Angular.

You can find more info on their page: https://oclazyload.readme.io

or the GitHub repository: https://github.com/ocombe/ocLazyLoad

回答2:

Core Angular API does provide this feature, simply use 'requires' property of module @ Properties section @ https://code.angularjs.org/1.4.7/docs/api/ng/type/angular.Module

var app = angular.module('myApp');

//Page 1 JS
//change below statement as per requirement in different pages
app.requires = ['ui.grid'];
app.controller('mainCtrl1', function($scope) {

}

//Page 2 JS
app.requires = ['ngResource', 'ui.bootstrap', 'ui.calendar'];
app.controller('mainCtrl2', function($scope) {

}

ocLazyLoad is also good solution, but I guess 'requires' property will solve your problem without much effort.

回答3:

In my project I dynamically bootstrap angular modules using angular.bootstrap(). I have several pages with different sets of modules.

Example:

var app = angular.module('demo', [])
.controller('WelcomeController', function($scope) {
  $scope.greeting = 'Welcome!';
});
angular.bootstrap(document, ['demo']);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-controller="WelcomeController">
  {{greeting}}
</div>

回答4:

$injector is used to retrieve object instances as defined by provider, instantiate types, invoke methods, and load modules.

var $http = $injector.get('$http');

To complete your use-case:

app.controller('mainCtrl', function($scope, $injector) {
    $scope.myData = [];
    if($scope.loadGrid) {
        var ui_grid = $injector.get('ui-grid');
        ui_grid.load($scope.myData); //`.load` is just a guess, obviously read your docs
    }
});

For more information see:

https://docs.angularjs.org/api/auto/service/$injector
https://github.com/angular/angular.js/wiki/Understanding-Dependency-Injection

回答5:

In a angularJS for injecting module you should inject it after your module name as you did.

But you have few steps to can use it:

Install it with this 2 way npm or bower like below:

npm install angular-ui-grid

bower install angular-ui-grid

Then add a <script> to your index.html:

<link rel="stylesheet" type="text/css"href="/bower_components/angularui-grid/ui-grid.css" />
<script src="/bower_components/angular-ui-grid/ui-grid.js"></script>