provide-page

provide-page

Provides automatic server-side rendering and actions (regardless of whether or not client has JavaScript enabled) to React components. Used in conjunction with provide-router.

If you're using react-router v2 or v3, you'll want v2 of this library.

Table of contents

1. Installation
2. Actions
3. Reducers
4. Components
5. Middleware
6. Example

Installation

npm install provide-page --save

Actions

You can use the following actions via propTypes to manage the state of the document both client-side and server-side.

setHeaders (Object headers)

These optional headers will be sent to the client with SSR (server-side rendering).

setStatusCode (Number statusCode)

An optional status code to send to the client with SSR.

setDocumentTitle (String documentTitle)

Sets the document's title.

setMetaDescription (String metaDescription)

Sets the document's meta description tag.

setMetaRobots (String metaRobots)

Sets the document's meta robots tag.

setIconFile (String iconFile)

Sets the document's favicon filename.

setCssFiles (Array cssFiles)

Sets the CSS filenames to be included with the document as link elements within the head element.

setJsFiles (Array jsFiles)

Sets the JS filenames to be included with the document as script elements appended to the body element.

setRequestError (String requestError)

Sets the error for the current request. This will be sent to the client.

submitRequest ({ String requestMethod, Object requestBody, Object requestHeaders, Object requestSession, Boolean acceptJson })

This action is mainly used automatically in conjunction with the Form component (see below), but you may trigger it manually if for some reason you need to do that.

submitForm (Object formData, Optional Function onSubmit)

This action is mainly used automatically in conjunction with the Form component (see below), but you may trigger it manually if for some reason you need to do that. The onSubmit function will be called after the client receives the server's response. This is useful for actions that can't be properly performed before receiving the necessary states from the server - e.g., resource creation. The Form component will include the onSubmit function by default if the Form's serverSide prop is true.

updateSession (Object updates)

Assigns the updates to requestSession.

destroySession ()

Destroys the requestSession.

Reducers

Your components may also be provided the following reduced propTypes.

headers

The headers sent to the client when using SSR and createMiddleware (see below).

statusCode

The status code sent to the client when using SSR and createMiddleware (see below).

documentTitle

The current title of the document.

metaDescription

The current description of the document.

metaRobots

How robots should treat the document. Defaults to index,follow.

iconFile

The current favicon for the document. Defaults to /static/favicon.ico.

cssFiles

The current CSS files for the document.

jsFiles

The current JS files for the document.

requestSession

Derived from request.session when used with createMiddleware (see below).

requestMethod

Derived from request.method when used with createMiddleware (see below).

requestBody

Derived from request.body when used with createMiddleware (see below).

requestHeaders

Derived from request.headers when used with createMiddleware (see below).

requestError

A message you can set to be sent to the client.

acceptJson

Derived from request.headers.accept (true if indexOf('application/json') > -1) when used with createMiddleware (see below). If true, the server will respond with the stores states after rendering the current URL on its end.

formData

Derived from requestBody and matching requestBody._formId to the component's props.formId when used with createMiddleware and the Form component (see below).

If a form element has a data-json attribute, it will be parsed using JSON.parse and become the element's value within formData. This is useful for certain data structures which can't be easily represented as a single element's value.

ssrDisabled

Defaults to false. Setting to true will prevent automatic retrieval of states from the server upon each route change. Also used internally within the Form component to dictate how each form is handled. Useful when you want to create components with forms that will work with both server-side rendering and client-only (or serverless) rendering. Intended to be configured as an initial state when mounting the app.

To globally disable handling of forms for automatic server-side rendering:

// src/providers/page.js

import page from 'provide-page';

// set the page provider's initial state like so;
// it will use this state when handling `Form` submissions
const ssrDisabled = true;

page.state = { ssrDisabled };

export default page;

You can also target specific forms by their formId prop:

// src/providers/page.js

import page from 'provide-page';

// target specific forms
const ssrDisabled = {
  someFormId: true,
  anotherFormId: true
};

page.state = { ssrDisabled };

export default page;

Or you can set ssrDisabled to an arbitrary configurable object used internally within your app to explicitly pass the ssrDisabled prop to your Forms, if for example you have some providers with both SSR replication and others that talk to a 3rd party API:

// src/providers/page.js

import page from 'provide-page';

// target specific forms
const ssrDisabled = {
  someThirdPartyProvider: true,
  anotherThirdPartyProvider: true
};

page.state = { ssrDisabled };

export default page;


// src/components/SomeComponent.js

import React from 'react';
import PropTypes from 'prop-types';
import { Form } from 'provide-page';

const SomeComponent = ({ formId, ssrDisabled }) => (
  <Form
    formId={formId}
    ssrDisabled={Boolean(ssrDisabled.someThirdPartyProvider)}
    onSubmit={(event, formData) => console.log(formData)}
  >
    <input type="text" name="someInput" />
    <input type="submit" value="Submit" />
  </Form>
);

SomeComponent.propTypes = {
  formId: PropTypes.string.isRequired,
  ssrDisabled: PropTypes.object.isRequired
};

SomeComponent.defaultProps = {
  formId: 'SomeComponent'
};

export default SomeComponent;

Or you can explicitly pass the ssrDisabled prop to the Form (not usually recommended as it might prevent configuration/reusability):

// src/components/SomeComponent.js

import React from 'react';
import PropTypes from 'prop-types';
import { Form } from 'provide-page';

const SomeComponent = ({ formId }) => (
  <Form
    formId={formId}
    ssrDisabled={true}
    onSubmit={(event, formData) => console.log(formData)}
  >
    <input type="text" name="someInput" />
    <input type="submit" value="Submit" />
  </Form>
);

SomeComponent.propTypes = {
  formId: PropTypes.string.isRequired
};

SomeComponent.defaultProps = {
  formId: 'SomeComponent'
};

export default SomeComponent;

Components

Form

A simple wrapper around <form { ...props } />. Combined with createMiddleware (see below), it intercepts the onSubmit event and allows all of the resulting actions to occur on the server, whether or not JS is enabled. If JS is enabled and the ssrDisabled prop is falsy, it will trigger the action on the server via XMLHttpRequest. All you need is a formId prop combined with an onSubmit prop that accepts formData as a second argument. Include a serverSide prop if the client needs states from the server before it can continue. The formId prop should exist within both the Form instance and the component instance rendering the form. See Lumbur's UserLogIn component for a full example.

Middleware

createMiddleware (Object options)

Returns a function that can be used as express (or other) middleware and will do the following for you, server-side:

• Automatically render the state of the app depending on some defaultProps ({ providers }), the request ({ method: requestMethod, body: requestBody, headers: requestHeaders }), and optional formData (see the Form component above).

• Respond with a full document string describing the current page - i.e., headers, status code, title, meta, favicon, js files, and css files - all controlled by your React components.

• Automatically wait for asynchronous actions before rendering.

• When used with the Form component (above), it will automatically trigger actions on the server regardless of whether or not JS is enabled.

• Automatically redirect clients with JS disabled to a new URL when it changes.

• Automatically optionally send a 408 (timeout) status when a request takes too long.

The options object passed to createMiddleware should take the following shape:

defaultProps

Extended to contain info about the request and then passed to your renderToString function. See lumbur/src/defaultProps.js for a full example.

renderToString (Object props)

This function should typically use react-dom/server's renderToString method under the hood to render your app to a string. See lumbur/src/renderAppToString.js for a full example.

renderDocumentToString (String html, Object states, Object clientStates)

Optional function that returns the string representation of the entire document. The states and clientStates objects come form the getStates and getClientStates functions below. See defaultRenderDocumentToString.js for an example.

getStates

Optional function that should return an object containing provider keys and their states, ultimately passed to both renderToString and renderDocumentToString. Your current providers' stores' states will be passed to this function. See lumbur/src/middleware.js for a full example where we concatenate the selected theme's files with the cssFiles and jsFiles reducers so that they're included as link and script tags when the document string is rendered.

Note: The middleware will look for a special optional clientStateKeys array on each provider which is used for determining which reducer keys (i.e., stores' states) to send to the client upon each request. The page provider defaults to only the requestSession and requestError keys. The router provider defaults to no keys. Every other provider defaults to all keys. See lumbur/src/renderAppToString.js for an example.

maxRenders

Defaults to 20. The first render initializes all of the necessary providers, and a second render may occur if the providers' replicators have changed the initial state. After everything is fully initialized, if a request.body exists, it will be treated as formData and the submitRequest action is dispatched, which typically subsequently triggers other actions and will continue rerendering until either stores' states have stopped changing or maxRenders is reached.

maxResponseTime

Default to 2000 (milliseconds). Sends a 408 status code if this timeout is reached. Setting this to 0 will disable it.

Example

See the following modules within Lumbur:

server.development.js

Passing hot reloadable middleware to express.

server.production.js

Passing production-ready, bundled middleware to express.

middleware.js

Using createMiddleware to create middleware specific to the app.