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view-helper.md

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View Helper

react-rails includes a view helper and an unobtrusive JavaScript driver which work together to put React components on the page.

The view helper (react_component) puts a div on the page with the requested component class & props. For example:

<%= react_component('HelloMessage', name: 'John') %>
<!-- becomes: -->
<div data-react-class="HelloMessage" data-react-props="{&quot;name&quot;:&quot;John&quot;}"></div>

On page load, the react_ujs driver will scan the page and mount components using data-react-class and data-react-props.

The view helper's signature is:

react_component(component_class_name, props={}, html_options={})
  • component_class_name is a string which identifies a component. See getConstructor for details.
  • props is either:
    • an object that responds to #to_json; or
    • an already-stringified JSON object (see JBuilder note below).
  • html_options may include:
    • tag: to use an element other than a div to embed data-react-class and data-react-props.
    • prerender: true to render the component on the server.
    • camelize_props to transform a props hash
    • **other Any other arguments (eg class:, id:) are passed through to content_tag.

Custom View Helper

react-rails uses a "helper implementation" class to generate the output of the react_component helper. The helper is initialized once per request and used for each react_component call during that request. You can provide a custom helper class to config.react.view_helper_implementation. The class must implement:

  • #react_component(name, props = {}, options = {}, &block) to return a string to inject into the Rails view
  • #setup(controller_instance), called when the helper is initialized at the start of the request
  • #teardown(controller_instance), called at the end of the request

react-rails provides one implementation, React::Rails::ComponentMount.