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Guide

中文指南

You may also want to read the recipes to find some use real-world use case, or read the design docs to know more technical details of rrweb.

Installation

Direct <script> include

You are recommended to install rrweb via jsdelivr's CDN service:

<link
  rel="stylesheet"
  href="https://cdn.jsdelivr.net/npm/rrweb@latest/dist/rrweb.min.css"
/>
<script src="https://cdn.jsdelivr.net/npm/rrweb@latest/dist/rrweb.min.js"></script>

Also, you can link to a specific version number that you can update manually:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/rrweb.min.js"></script>

Only include the recorder code

rrweb's code includes both the record and the replay parts. Most of the time you only need to include the record part into your targeted web Apps. This also can be done by using the CDN service:

<script src="https://cdn.jsdelivr.net/npm/rrweb@latest/dist/record/rrweb-record.min.js"></script>

Other bundles

Besides the record/rrweb-record.min.js entry, rrweb also provides other bundles for different usage.

# Include record, replay, compression, and decompression.
rrweb-all.js
rrweb-all.min.js
# Include record and replay.
rrweb.js
rrweb.min.js
# Include the styles for replay.
rrweb.min.css
# Record
record/rrweb-record.js
record/rrweb-record.min.js
# Data compression.
record/rrweb-record-pack.js
record/rrweb-record-pack.min.js
# Replay
replay/rrweb-replay.js
replay/rrweb-replay.min.js
# Data decompression.
replay/rrweb-replay-unpack.js
replay/rrweb-replay-unpack.min.js

NPM

npm install --save rrweb

rrweb provides both commonJS and ES modules bundles, which are easy to use with the popular bundlers.

Compatibility Note

rrweb does not support IE11 and below because it uses the MutationObserver API which was supported by these browsers.

Getting Started

Record

If you only included the record code with <script>, then you must use the global variable rrwebRecord instead of rrweb.record. The following sample code will use the variable rrweb which is the default exporter of this library.

rrweb.record({
  emit(event) {
    // store the event in any way you like
  },
});

During recording, the recorder will emit when there is some event incurred, all you need to do is to store the emitted events in any way you like.

The record method returns a function which can be called to stop events from firing:

let stopFn = rrweb.record({
  emit(event) {
    if (events.length > 100) {
      // stop after 100 events
      stopFn();
    }
  },
});

A more real-world usage may look like this:

let events = [];

rrweb.record({
  emit(event) {
    // push event into the events array
    events.push(event);
  },
});

// this function will send events to the backend and reset the events array
function save() {
  const body = JSON.stringify({ events });
  events = [];
  fetch('http://YOUR_BACKEND_API', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body,
  });
}

// save events every 10 seconds
setInterval(save, 10 * 1000);

Options

The parameter of rrweb.record accepts the following options.

key default description
emit required the callback function to get emitted events
checkoutEveryNth - take a full snapshot after every N events
refer to the checkout chapter
checkoutEveryNms - take a full snapshot after every N ms
refer to the checkout chapter
blockClass 'rr-block' Use a string or RegExp to configure which elements should be blocked, refer to the privacy chapter
ignoreClass 'rr-ignore' Use a string or RegExp to configure which elements should be ignored, refer to the privacy chapter
blockSelector null Use a string or RegExp to configure which selector should be blocked, refer to the privacy chapter
maskAllInputs false mask all input content as *
maskInputOptions {} mask some kinds of input *
refer to the list
maskInputFn - customize mask input content recording logic
slimDOMOptions {} remove unnecessary parts of the DOM
refer to the list
inlineStylesheet true whether to inline the stylesheet in the events
hooks {} hooks for events
refer to the list
packFn - refer to the storage optimization recipe
sampling - refer to the storage optimization recipe
recordCanvas false whether to record the canvas element
collectFonts false whether to collect fonts in the website
recordLog false whether to record console output, refer to the console recipe

Privacy

You may find some contents on the webpage which are not willing to be recorded, then you can use the following approaches:

  • An element with the class name .rr-block will not be recorded. Instead, it will replay as a placeholder with the same dimension.
  • An element with the class name .rr-ignore will not record its input events.
  • input[type="password"] will be ignored as default.
  • Mask options to mask the content in input elements.

Checkout

By default, all the emitted events are required to replay a session and if you do not want to store all the events, you can use the checkout config.

Most of the time you do not need to configure this. But if you want to do something like capturing just the last N events from when an error has occurred, here is an example:

// We use a two-dimensional array to store multiple events array
const eventsMatrix = [[]];

rrweb.record({
  emit(event, isCheckout) {
    // isCheckout is a flag to tell you the events has been checkout
    if (isCheckout) {
      eventsMatrix.push([]);
    }
    const lastEvents = eventsMatrix[eventsMatrix.length - 1];
    lastEvents.push(event);
  },
  checkoutEveryNth: 200, // checkout every 200 events
});

// send last two events array to the backend
window.onerror = function () {
  const len = eventsMatrix.length;
  const events = eventsMatrix[len - 2].concat(eventsMatrix[len - 1]);
  const body = JSON.stringify({ events });
  fetch('http://YOUR_BACKEND_API', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body,
  });
};

Due to the incremental-snapshot-chain mechanism rrweb used, we can not capture the last N events accurately. With the sample code above, you will finally get the last 200 to 400 events been sent to your backend.

Similarly, you can also configure checkoutEveryNms to capture the last N minutes events:

// We use a two-dimensional array to store multiple events array
const eventsMatrix = [[]];

rrweb.record({
  emit(event, isCheckout) {
    // isCheckout is a flag to tell you the events has been checkout
    if (isCheckout) {
      eventsMatrix.push([]);
    }
    const lastEvents = eventsMatrix[eventsMatrix.length - 1];
    lastEvents.push(event);
  },
  checkoutEveryNms: 5 * 60 * 1000, // checkout every 5 minutes
});

// send last two events array to the backend
window.onerror = function () {
  const len = eventsMatrix.length;
  const events = eventsMatrix[len - 2].concat(eventsMatrix[len - 1]);
  const body = JSON.stringify({ events });
  fetch('http://YOUR_BACKEND_API', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body,
  });
};

With the sample code above, you will finally get the last 5 to 10 minutes of events been sent to your backend.

Replay

You need to include the style sheet before replay:

<link
  rel="stylesheet"
  href="https://cdn.jsdelivr.net/npm/rrweb@latest/dist/rrweb.min.css"
/>

And then initialize the replayer with the following code:

const events = YOUR_EVENTS;

const replayer = new rrweb.Replayer(events);
replayer.play();

Control the replayer by API

const replayer = new rrweb.Replayer(events);

// play
replayer.play();

// play from the third seconds
replayer.play(3000);

// pause
replayer.pause();

// pause at the fifth seconds
replayer.pause(5000);

Options

The replayer accepts options as its constructor's second parameter, and it has the following options:

key default description
speed 1 replay speed ratio
root document.body the root element of replayer
loadTimeout 0 timeout of loading remote style sheet
skipInactive false whether to skip inactive time
showWarning true whether to print warning messages during replay
showDebug false whether to print debug messages during replay
blockClass 'rr-block' element with the class name will display as a blocked area
liveMode false whether to enable live mode
insertStyleRules [] accepts multiple CSS rule string, which will be injected into the replay iframe
triggerFocus true whether to trigger focus during replay
UNSAFE_replayCanvas false whether to replay the canvas element. Enable this will remove the sandbox, which is unsafe.
mouseTail true whether to show mouse tail during replay. Set to false to disable mouse tail. A complete config can be found in this type
unpackFn - refer to the storage optimization recipe
logConfig - configuration of console output playback, refer to the console recipe

Use rrweb-player

Since rrweb's replayer only provides a basic UI, you can choose rrweb-replayer which is based on rrweb's public APIs but has a feature-rich replayer UI.

Installation

rrweb-player can also be included with <script>：

<link
  rel="stylesheet"
  href="https://cdn.jsdelivr.net/npm/rrweb-player@latest/dist/style.css"
/>
<script src="https://cdn.jsdelivr.net/npm/rrweb-player@latest/dist/index.js"></script>

Or installed by using NPM：

npm install --save rrweb-player
Usage
new rrwebPlayer({
  target: document.body, // customizable root element
  props: {
    events,
  },
});
Options
key default description
events [] the events for replaying
width 1024 the width of the replayer
height 576 the height of the replayer
autoPlay true whether to autoplay
speedOption [1, 2, 4, 8] speed options in UI
showController true whether to show the controller UI
tags {} customize the custom events style with a key-value map
... - all the rrweb Replayer options will be bypassed

Events

Developers may want to extend the rrweb's replayer or respond to its events. Such as giving notification when the replayer starts to skip inactive time. So rrweb expose a public API on which allow developers to listen to the events and customize the reactions, and it has the following events:

const replayer = new rrweb.Replayer(events);
replayer.on(EVENT_NAME, (payload) => {
  ...
})

The event list:

Event Description Value
start started to replay -
pause paused the replay -
finish finished the replay -
resize the viewport has changed { width, height }
fullsnapshot-rebuilded rebuilded a full snapshot event
load-stylesheet-start started to load remote stylesheets -
load-stylesheet-end loaded remote stylesheets -
skip-start started to skip inactive time { speed }
skip-end skipped inactive time { speed }
mouse-interaction mouse interaction has been replayed { type, target }
event-cast event has been replayed event
custom-event custom event has been replayed event

The rrweb-replayer also re-expose the event listener via a component.addEventListener API.

And there are three rrweb-replayer event will be emitted in the same way:

Event Description Value
ui-update-current-time current time has changed { detail: { payload } }
ui-update-player-state current player state has changed { detail: { payload } }
ui-update-progress current progress has changed { detail: { payload } }

REPL tool

You can also play with rrweb by using the REPL testing tool which does not need installation.

Run npm run repl to launch a browser and ask for a URL you want to test on the CLI:

Enter the url you want to record, e.g https://react-redux.realworld.io:

Waiting for the browser to open the specified page and print the following messages on the CLI:

Enter the url you want to record, e.g https://react-redux.realworld.io: https://github.com
Going to open https://github.com...
Ready to record. You can do any interaction on the page.
Once you want to finish the recording, enter 'y' to start replay:

At this point, you can interact on the web page. After the desired operations have been recorded, enter 'y' on the CLI, and the test tool will replay the operations to verify whether the recording was successful.

The following messages will be printed on the CLI during replay:

Enter 'y' to persistently store these recorded events:

At this point, you can enter 'y' again on the CLI. The test tool will save the recorded session into a static HTML file and prompt for the location:

Saved at PATH_TO_YOUR_REPO/temp/replay_2018_11_23T07_53_30.html

This file uses the latest rrweb bundle code, so we can run npm run bundle:browser after patching the code, then refresh the static file to see and debug the impact of the latest code on replay.