What is the best way to rename or selectively load angularJS libraries?

We offer a unique product in the form of a widget that can be integrated into websites. This widget consists of a single JS file that includes angular for functionality. However, a problem arises when a website already has angular loaded independently - an error is triggered, disrupting the site with the message:

WARNING: Tried to load angular more than once

This error occurs because angular is being loaded twice.

Our goal is to address this issue by either:

  1. Renaming or isolating angular in our script to avoid conflicts with the host site's version of angular, or
  2. Detecting if angular is already present on the site and refraining from loading it again.

While providing specific code examples may be challenging due to the complexity of our system spread across multiple files, our approach is based on the angular seed project utilizing requirejs for module loading. We then compile everything into a single file: https://github.com/tnajdek/angular-requirejs-seed

We welcome any advice, feedback, or solutions to resolve this issue.

Please note that this is not related to typical "check if angular loaded correctly" queries. The challenge lies in renaming angular within our widget package when it's already loaded on the parent page.

javascriptangularjsrequirejs

Answer №1

If you're facing a similar situation, I recommend checking out this solution, which pertains to a chrome extension running under similar circumstances. The key is to segregate the loading of angular from the website's loading process, assuming that your widget will load after the main content of the page.

  1. When incorporating html content with an ng-app directive or ng-controller, enclose your html in a container with the attribute ng-non-bindable.
  2. Angular immediately searches for an element with the ng-app attribute upon loading angular.js. If there are two ng-apps present on your site (one for the site and one for the widget), it can lead to errors. Postpone parsing by using: 
    window.name = "NG_DEFER_BOOTSTRAP!" + window.name;
    Then proceed to load your script.
  3. Upon script loading completion, reset window.name to '' or its original value.

  4. To bootstrap your html content individually (angular locating an ng-app attribute), employ:

    var appRoot = document.querySelector('#id');

angular.bootstrap(appRoot, ['angularModuleName']);

Following these steps should resolve the issue. Keep in mind, though, I cannot guarantee how this method will function if your widget's Angular version differs from that of the client website. Additionally, my experience relates to making it work with extensions, which operate slightly differently as they exist within their own distinct 'worlds'.

With that said, I believe this guidance should aid individuals in navigating through this particular challenge.

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