Lazy loading

Remarks#

If your lazy loaded dependencies require other lazy loaded dependencies make sure you load them in the right order!

angular.module(‘lazy’, [ ‘alreadyLoadedDependency1’, ‘alreadyLoadedDependency2’, … { files: [ ‘path/to/lazily/loaded/dependency1.js’, ‘path/to/lazily/loaded/dependency2.js’, //<--- requires lazily loaded dependency1 ‘path/to/lazily/loaded/dependency.css’ ], serie: true //Sequential load instead of parallel } ]);

Preparing your project for lazy loading

After including oclazyload.js in your index file, declare ocLazyLoad as a dependency in app.js

//Make sure you put the correct dependency! it is spelled different than the service!
angular.module('app', [
 'oc.lazyLoad',
 'ui-router'
])

Usage

In order to lazily load files inject the $ocLazyLoad service into a controller or another service

.controller('someCtrl', function($ocLazyLoad) {
 $ocLazyLoad.load('path/to/file.js').then(...);
});

Angular modules will be automatically loaded into angular.

Other variation:

$ocLazyLoad.load([
  'bower_components/bootstrap/dist/js/bootstrap.js',
  'bower_components/bootstrap/dist/css/bootstrap.css',
  'partials/template1.html'
]);

For a complete list of variations visit the official documentation

Usage with router

UI-Router:

.state('profile', {
 url: '/profile',
 controller: 'profileCtrl as vm'
 resolve: {
  module: function($ocLazyLoad) {
   return $ocLazyLoad.load([
    'path/to/profile/module.js',
    'path/to/profile/style.css'
   ]);
  }
 }
});

ngRoute:

.when('/profile', {
     controller: 'profileCtrl as vm'
     resolve: {
      module: function($ocLazyLoad) {
       return $ocLazyLoad.load([
        'path/to/profile/module.js',
        'path/to/profile/style.css'
       ]);
      }
     }
    });

Using dependency injection

The following syntax allows you to specify dependencies in your module.js instead of explicit specification when using the service

//lazy_module.js
angular.module('lazy', [
 'alreadyLoadedDependency1',
 'alreadyLoadedDependency2',
 ...
 [
  'path/to/lazily/loaded/dependency.js',
  'path/to/lazily/loaded/dependency.css'
 ]
]);

Note: this syntax will only work for lazily loaded modules!

Using the directive

<div oc-lazy-load="['path/to/lazy/loaded/directive.js', 'path/to/lazy/loaded/directive.html']">

<!-- myDirective available here -->
<my-directive></my-directive>

</div>