React Async Script Loader

A React composition mixin for loading 3rd party scripts asynchronously. This component allows you to wrap component that needs 3rd party resources, like reCAPTCHA or Google Maps, and have them load the script asynchronously.

With React 0.13, mixins are getting deprecated in favor of composition.

After reading this article, Mixins Are Dead. Long Live Composition, I decided push react-script-loader a bit further and make a composition function that wraps component.

Version to use

• React < 15.5: v0.8.0
• React >= 15.5: >= v0.9.0

Usage

The api is very simple makeAsyncScriptLoader(Component, scriptUrl, options). Where options can contain exposeFuncs, callbackName and globalName.

• Component: The component to wrap.
• scriptUrl: the full of the script tag.
• options (optional):
  • exposeFuncs: Array of String. It'll create a function that will call the child component with the same name. It passes arguments and return value.
  • callbackName: If the scripts calls a global function when loaded, provide the callback name here. It'll be autoregistered on the window.
  • globalName: If wanted, provide the globalName of the loaded script. It'll be injected on the component with the same name (ex: "grecaptcha")
  • removeOnUnmount: Boolean default=false: If set to true removes the script tag on the component unmount

You can retrieve the child component using the function called getComponent().

Example

See https://github.com/dozoisch/react-google-recaptcha

// recaptcha-wrapper.js
"use strict";
import React from "react";

import ReCAPTCHA from "./recaptcha";
import makeAsyncScriptLoader from "./react-async-script";

const callbackName = "onloadcallback";
const URL = `https://www.google.com/recaptcha/api.js?onload=${callbackName}&render=explicit`;
const globalName = "grecaptcha";

export default makeAsyncScriptLoader(ReCAPTCHA, URL, {
  callbackName: callbackName,
  globalName: globalName,
});

// main.js
"use strict";
import React from "react";
import ReCAPTCHAWrapper from "./recaptcha-wrapper.js"

function onLoad() {
  console.log("script loaded");
}

let reCAPTCHAprops = {
  siteKey: "xxxxxxx",
  //...
};

React.render(
  <ReCAPTCHAWrapper asyncScriptOnLoad={onLoad} {...reCAPTCHAprops} />,
  document.body
);

Expose Functions

This is really useful if the child component has some utility functions (like getValue) that you would like the wrapper to expose.

You can still retrieve the child component using getComponent().

Example

const MockedComponent = React.createClass({
  displayName: "MockedComponent",

  callsACallback(fn) {
    fn();
  },

  render() {
    return <span/>;
  }
});

let ComponentWrapper = makeAsyncScriptLoader(MockedComponent, "http://example.com", {
  exposeFuncs: ["callsACallback"]
});
let instance = ReactTestUtils.renderIntoDocument(
  <ComponentWrapper />
);
instance.callsACallback(function () { console.log("Called from child", this.constructor.displayName); });

Inspired by react-script-loader

The build tools are highly inspired by react-bootstrap