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ReactOnRails JavaScript API

CSRF protection

Rails has built-in protection for Cross-Site Request Forgery (CSRF), see Rails Documentation. To nicely utilize this feature in JavaScript requests, React on Rails provides two helpers that can be used as following for POST, PUT or DELETE requests:

import ReactOnRails from 'react-on-rails';

// reads from DOM csrf token generated by Rails in <%= csrf_meta_tags %>
csrfToken = ReactOnRails.authenticityToken();

// compose Rails specific request header as following { X-CSRF-Token: csrfToken, X-Requested-With: XMLHttpRequest }
header = ReactOnRails.authenticityHeaders(otherHeader);

If you are using jquery-ujs for AJAX calls, then these helpers are not needed because the jquery-ujs library updates header automatically, see jquery-ujs documentation.


The best source of docs is the main ReactOnRails.js file. Here's a quick summary. No guarantees that this won't be outdated!

   * Main entry point to using the react-on-rails npm package. This is how Rails will be able to
   * find you components for rendering. Components get called with props, or you may use a
   * "Render-Function" to return a React component or an object with the following shape:
   * { renderedHtml, redirectLocation, error }.
   * For server rendering, if you wish to return multiple HTML strings from a Render-Function,
   * you may return an Object from your Render-Function with a single top level property of
   * renderedHtml. Inside this Object, place a key called componentHtml, along with any other
   * needed keys. This is useful when you using side effects libraries like react helmet.
   * Your Ruby code with get this Object as a Hash containing keys componentHtml and any other
   * custom keys that you added:
   * { renderedHtml: { componentHtml, customKey1, customKey2 } }
   * See the example in
   * @param components (key is component name, value is component)

   * Allows registration of store generators to be used by multiple react components on one Rails
   * view. store generators are functions that take one arg, props, and return a store. Note that
   * the setStore API is different in tha it's the actual store hydrated with props.
   * @param stores (key is store name, value is the store generator)

   * Allows retrieval of the store by name. This store will be hydrated by any Rails form props.
   * Pass optional param throwIfMissing = false if you want to use this call to get back null if the
   * store with name is not registered.
   * @param name
   * @param throwIfMissing Defaults to true. Set to false to have this call return undefined if
   *        there is no store with the given name.
   * @returns Redux Store, possibly hydrated
  getStore(name, throwIfMissing = true )

   * Renders or hydrates the react element passed. In case react version is >=18 will use the new api.
   * @param domNode
   * @param reactElement
   * @param hydrate if true will perform hydration, if false will render
   * @returns {Root|ReactComponent|ReactElement|null}
  reactHydrateOrRender(domNode, reactElement, hydrate)

   * Set options for ReactOnRails, typically before you call ReactOnRails.register
   * Available Options:
   * `traceTurbolinks: true|false Gives you debugging messages on Turbolinks events

   * Allow directly calling the page loaded script in case the default events that trigger react
   * rendering are not sufficient, such as when loading JavaScript asynchronously with TurboLinks:
   * More details can be found here:

   * Returns CSRF authenticity token inserted by Rails csrf_meta_tags
   * @returns String or null


   * Returns header with csrf authenticity token and XMLHttpRequest
   * @param {*} other headers
   * @returns {*} header

  authenticityHeaders(otherHeaders = {})