CODEWITHSUNDEEP
javascriptnode.jsreactjswebpack
jay.m
jay.m

Reputation: 1628

how to use webpack to load CDN or external vendor javascript lib in js file, not in html file

I am using react starter kit for client side programming. It uses react and webpack. No index.html or any html to edit, all js files. My question is if I want to load a vendor js lib from cloud, how to do I do that?

It would be easy to do that in a html file. <script src="https://forio.com/tools/js-libs/1.5.0/epicenter.min.js"></script>

However, in js file, it only uses npm installed packages. How can I import the above lib with no html file? I tried import and require, they only work for local files.

update 10/21/15 So far I tried two directions, neither is ideal.

  1. @minheq yes there is a html file sort of for react start kit. It is html.js under src/components/Html. I can put cloud lib and all its dependencies there like this:
        <div id="app" dangerouslySetInnerHTML={{__html: this.props.body}} />
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
        <script src="https://forio.com/tools/js-libs/1.5.0/epicenter.min.js"></script>
        <script src="/app.js"></script>
        <script dangerouslySetInnerHTML={this.trackingCode()} />
    </body>

Good news is it works, I don't need do anything else in js file, no import or require. However, now I have two jquery libs loaded in different ways. One in here, the other through npm and webpack. I wonder it will give me trouble later. The react-routing I use give me 'undefined variable' error if I type a none home path in browser window due to the server side loading I guess. So this solution is not very good.

  1. Use webpack externals feature. This is documented as: link. "You can use the externals options for applications too, when you want to import an existing API into the bundle. I.e. you want to use jquery from CDN (separate tag) and still want to require("jquery") in your bundle. Just specify it as external: { externals: { jquery: "jQuery" } }." However, the documentation I found a few places are all fussy about how to do this exactly. So far I have no idea how to use it to replace <script src="https://forio.com/tools/js-libs/1.5.0/epicenter.min.js"></script> in html.

Upvotes: 47

Views: 54782

Answers (6)

Jack Spektor
Jack Spektor

Reputation: 1117

You can create a script tag in your JS as

$("body").append($('<script src="https://forio.com/tools/js-libs/1.5.0/epicenter.min.js"></script>'))

Upvotes: 7

Felipe Desiderati
Felipe Desiderati

Reputation: 2982

I have looked around for a solution and most of all proposals were based on externals, which is not valid in my case.

In this other post, I have posted my solution: https://stackoverflow.com/a/62603539/8650621

In other words, I finished using a separate JS file which is responsible for downloading the desired file into a local directory. Then WebPack scans this directory and bundles the downloaded files together with the application.

Upvotes: 0

Johnny
Johnny

Reputation: 319

var $script = require("scriptjs");
$script("//ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js", function() {
  $('body').html('It works!')
});

Upvotes: 16

Tom Chen
Tom Chen

Reputation: 1519

externals is not intended to let you do this. It means "don't compile this resource into the final bundle because I will include it myself"

What you need is a script loader implementation such as script.js. I also wrote a simple app to compare different script loader implementations: link.

Upvotes: 23

minheq
minheq

Reputation: 472

There is one html file that is definitely being used to serve to users with your js bundle attached. Probably you could attach the script tag into that html file

Upvotes: 2

Griffith
Griffith

Reputation: 3217

Use webpack's externals:

externals allows you to specify dependencies for your library that are not resolved by webpack, but become dependencies of the output. This means they are imported from the environment during runtime.

Upvotes: 1

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