JavaScript V4 SDK for Realtime Apps

Latest version

https://cdn.pubnub.com/sdk/javascript/pubnub.4.23.0.js

Latest minified version

https://cdn.pubnub.com/sdk/javascript/pubnub.4.23.0.min.js

Get Code: Source

https://github.com/pubnub/javascript

View Supported Platforms

Hello World

You must include the PubNub JavaScript SDK in your code before initializing the client.

Include PubNub JavaScript SDK

<script src="https://cdn.pubnub.com/sdk/javascript/pubnub.4.23.0.js"></script>

Example

function publish() {
  
    pubnub = new PubNub({
        publishKey : 'demo',
        subscribeKey : 'demo'
    })
      
    function publishSampleMessage() {
        console.log("Since we're publishing on subscribe connectEvent, we're sure we'll receive the following publish.");
        var publishConfig = {
            channel : "hello_world",
            message: { 
                title: "greeting",
                description: "hello world!"
            }
        }
        pubnub.publish(publishConfig, function(status, response) {
            console.log(status, response);
        })
    }
      
    pubnub.addListener({
        status: function(statusEvent) {
            if (statusEvent.category === "PNConnectedCategory") {
                publishSampleMessage();
            }
        },
        message: function(msg) {
            console.log(msg.message.title);
            console.log(msg.message.description);
        },
        presence: function(presenceEvent) {
            // handle presence
        }
    })      
    console.log("Subscribing..");
    pubnub.subscribe({
        channels: ['hello_world'] 
    });
};

Copy and paste examples

In addition to the Hello World sample code, we also provide some copy and paste snippets of common API functions:

Instantiate a new Pubnub instance. Only the subscribeKey is mandatory. Also include publishKey if you intend to publish from this instance, and the secretKey if you wish to perform PAM administrative operations from this JavaScript V4 instance.

It is not a best practice to include the secretKey in client-side code for security reasons.

When you init with secretKey, you get root permissions for the Access Manager. With this feature you don't have to grant access to your servers to access channel data. The servers get all access on all channels.

Set restore as true to allow catch up on the front-end applications.

Initializing the client

var pubnub = new PubNub({
	subscribeKey: "mySubscribeKey",
	publishKey: "myPublishKey",
	ssl: true
})

Listeners

Adding Listeners

pubnub.addListener({
    message: function(m) {
        // handle message
        var channelName = m.channel; // The channel for which the message belongs
        var channelGroup = m.subscription; // The channel group or wildcard subscription match (if exists)
        var pubTT = m.timetoken; // Publish timetoken
        var msg = m.message; // The Payload
        var publisher = m.publisher; //The Publisher
    },
    presence: function(p) {
        // handle presence
        var action = p.action; // Can be join, leave, state-change or timeout
        var channelName = p.channel; // The channel for which the message belongs
        var occupancy = p.occupancy; // No. of users connected with the channel
        var state = p.state; // User State
        var channelGroup = p.subscription; //  The channel group or wildcard subscription match (if exists)
        var publishTime = p.timestamp; // Publish timetoken
        var timetoken = p.timetoken;  // Current timetoken
        var uuid = p.uuid; // UUIDs of users who are connected with the channel
    },
    status: function(s) {
        var affectedChannelGroups = s.affectedChannelGroups; // The channel groups affected in the operation, of type array.
        var affectedChannels = s.affectedChannels; // The channels affected in the operation, of type array.
        var category = s.category; //Returns PNConnectedCategory
        var operation = s.operation; //Returns PNSubscribeOperation
        var lastTimetoken = s.lastTimetoken; //The last timetoken used in the subscribe request, of type long.
        var currentTimetoken = s.currentTimetoken; //The current timetoken fetched in the subscribe response, which is going to be used in the next request, of type long.
        var subscribedChannels = s.subscribedChannels; //All the current subscribed channels, of type array.
    }
});

Removing Listeners

var existingListener = {
    message: function() {
    } 
}

pubnub.removeListener(existingListener)

listeners status events

Categories	Description
`PNNetworkUpCategory`	SDK detected that network is online.
`PNNetworkDownCategory`	The SDK will announce this when connection is not available or this is not able to reach the PubNub Data Stream Network.
`PNNetworkIssuesCategory`	A subscribe event experienced an exception when running. The SDK is not being to able reach the PubNub Data Stream Network because the machine or device are not connected to Internet or this has been lost, your ISP (Internet Service Provider) is having to troubles or perhaps or the SDK is behind of a proxy.
`PNReconnectedCategory`	SDK was able to reconnect to pubnub.
`PNConnectedCategory`	SDK subscribed with a new mix of channels (fired every time the `channel` / `channel group` mix changed).
`PNAccessDeniedCategory`	PAM permission failure.
`PNMalformedResponseCategory`	JSON parsing crashed.
`PNBadRequestCategory`	The server responded with bad response because the request is malformed.
`PNDecryptionErrorCategory`	If using decryption strategies and the decryption fails.
`PNTimeoutCategory`	Failure to establish connection due to timeout.
`PNRequestMessageCountExceedCategory`	The SDK will announce this error if `requestMessageCountThreshold` is set and the number of messages arrived from (PubNub in memory cache messages) are greater than this.
`PNUnknownCategory`	This status code is returned when the subscriber get’s a non 200 HTTP response code from the server.

Time

Call time() to verify the client connectivity to the origin:

// assuming an initialized PubNub instance already exists
pubnub.time(function(status, response) {
	if (status.error) {
		// handle error if something went wrong based on the status object
	} else {
		console.log(response.timetoken);
	}
})

Subscribe (listen on) a channel

pubnub.subscribe({
    channels: ['my_channel'],
});

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

Publish

Publish a message to a channel:

pubnub.publish(
    {
        message: {
            such: 'object'
        },
        channel: 'ch1',
        sendByPost: false, // true to send via POST
        storeInHistory: false, //override default storage options
        meta: {
            "cool": "meta"
        } // publish extra meta with the request
    },
    function (status, response) {
        // handle status, response
    }
);

Here Now

Get occupancy of who's here now on the channel by UUID:

Requires that the Presence add-on is enabled for your key. How do I enable add-on features for my keys? - see http://www.pubnub.com/knowledge-base/discussion/644/how-do-i-enable-add-on-features-for-my-keys

pubnub.hereNow(
    {
        channels: ["ch1"], 
        channelGroups : ["cg1"],
        includeUUIDs: true,
        includeState: true 
    },
    function (status, response) {
        // handle status, response
    }
);

Presence

Subscribe to realtime Presence events, such as join, leave, and timeout, by UUID. Setting the presence attribute to a callback will subscribe to presents events on my_channel:

pubnub.subscribe({
	channels: ['my_channel'],
	withPresence: true
});

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

History

Retrieve published messages from archival storage:

Requires that the Storage and Playback add-on is enabled for your key. How do I enable add-on features for my keys? - see http://www.pubnub.com/knowledge-base/discussion/644/how-do-i-enable-add-on-features-for-my-keys

pubnub.history(
    {
        channel: 'history_channel',
        count: 100, // how many items to fetch
        stringifiedTimeToken: true, // false is the default
    },
    function (status, response) {
        // handle status, response
    }
);

Unsubscribe

Stop subscribing (listening) to a channel.

pubnub.unsubscribe({
    channels: ['my_channel']
})

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

Get Code:

npm install pubnub

Get Code: Source

https://github.com/pubnub/javascript

View Supported Platforms

Hello World

You must include the PubNub JavaScript SDK in your code before initializing the client.

Include PubNub JavaScript SDK

var PubNub = require('pubnub')

Example

function publish() {
  
    pubnub = new PubNub({
        publishKey : 'demo',
        subscribeKey : 'demo'
    })
      
    function publishSampleMessage() {
        console.log("Since we're publishing on subscribe connectEvent, we're sure we'll receive the following publish.");
        var publishConfig = {
            channel : "hello_world",
            message : {
            	title: "greeting",
            	description: "hello world!"
            }
        }
        pubnub.publish(publishConfig, function(status, response) {
            console.log(status, response);
        })
    }
      
    pubnub.addListener({
        status: function(statusEvent) {
            if (statusEvent.category === "PNConnectedCategory") {
                publishSampleMessage();
            }
        },
        message: function(msg) {
            console.log(msg.message.title);
            console.log(msg.message.description);
        },
        presence: function(presenceEvent) {
            // handle presence
        }
    })      
    console.log("Subscribing..");
    pubnub.subscribe({
        channels: ['hello_world'] 
    });
};

Copy and paste examples

In addition to the Hello World sample code, we also provide some copy and paste snippets of common API functions:

Init

It is not a best practice to include the secretKey in client-side code for security reasons.

Set restore as true to allow catch up on the front-end applications.

Initializing the client

// PubNub = require('pubnub'); 		ES5
import PubNub from 'pubnub';		ES6

var pubnub = new PubNub({
	subscribeKey: "mySubscribeKey",
	publishKey: "myPublishKey",
	secretKey: "secretKey",
	ssl: true
})

Listeners

Adding Listeners

pubnub.addListener({
    message: function(m) {
        // handle message
        var channelName = m.channel; // The channel for which the message belongs
        var channelGroup = m.subscription; // The channel group or wildcard subscription match (if exists)
        var pubTT = m.timetoken; // Publish timetoken
        var msg = m.message; // The Payload
        var publisher = m.publisher; //The Publisher
    },
    presence: function(p) {
        // handle presence
        var action = p.action; // Can be join, leave, state-change or timeout
        var channelName = p.channel; // The channel for which the message belongs
        var occupancy = p.occupancy; // No. of users connected with the channel
        var state = p.state; // User State
        var channelGroup = p.subscription; //  The channel group or wildcard subscription match (if exists)
        var publishTime = p.timestamp; // Publish timetoken
        var timetoken = p.timetoken;  // Current timetoken
        var uuid = p.uuid; // UUIDs of users who are connected with the channel
    },
    status: function(s) {
        var affectedChannelGroups = s.affectedChannelGroups; // The channel groups affected in the operation, of type array.
        var affectedChannels = s.affectedChannels; // The channels affected in the operation, of type array.
        var category = s.category; //Returns PNConnectedCategory
        var operation = s.operation; //Returns PNSubscribeOperation
        var lastTimetoken = s.lastTimetoken; //The last timetoken used in the subscribe request, of type long.
        var currentTimetoken = s.currentTimetoken; //The current timetoken fetched in the subscribe response, which is going to be used in the next request, of type long.
        var subscribedChannels = s.subscribedChannels; //All the current subscribed channels, of type array.
    }
});

Removing Listeners

var existingListener = {
    message: function() {
    } 
}

pubnub.removeListener(existingListener)

listeners status events

Categories	Description
`PNNetworkUpCategory`	SDK detected that network is online.
`PNNetworkDownCategory`	The SDK will announce this when connection is not available or this is not able to reach the PubNub Data Stream Network.
`PNNetworkIssuesCategory`	A subscribe event experienced an exception when running. The SDK is not being to able reach the PubNub Data Stream Network because the machine or device are not connected to Internet or this has been lost, your ISP (Internet Service Provider) is having to troubles or perhaps or the SDK is behind of a proxy.
`PNReconnectedCategory`	SDK was able to reconnect to pubnub.
`PNConnectedCategory`	SDK subscribed with a new mix of channels (fired every time the `channel` / `channel group` mix changed).
`PNAccessDeniedCategory`	PAM permission failure.
`PNMalformedResponseCategory`	JSON parsing crashed.
`PNBadRequestCategory`	The server responded with bad response because the request is malformed.
`PNDecryptionErrorCategory`	If using decryption strategies and the decryption fails.
`PNTimeoutCategory`	Failure to establish connection due to timeout.
`PNRequestMessageCountExceedCategory`	The SDK will announce this error if `requestMessageCountThreshold` is set and the number of messages arrived from (PubNub in memory cache messages) are greater than this.
`PNUnknownCategory`	This status code is returned when the subscriber get’s a non 200 HTTP response code from the server.

Time

Call time() to verify the client connectivity to the origin:

// assuming an initialized PubNub instance already exists
pubnub.time(function(status, response) {
	if (status.error) {
		// handle error if something went wrong based on the status object
	} else {
		console.log(response.timetoken);
	}
})

Subscribe (listen on) a channel

pubnub.subscribe({
    channels: ['my_channel'],
});

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

Publish

Publish a message to a channel:

pubnub.publish(
    {
        message: {
            such: 'object'
        },
        channel: 'ch1',
        sendByPost: false, // true to send via POST
        storeInHistory: false, //override default storage options
        meta: {
            "cool": "meta"
        } // publish extra meta with the request
    },
    function (status, response) {
        // handle status, response
    }
);

Here Now

Get occupancy of who's here now on the channel by UUID:

pubnub.hereNow(
    {
        channels: ["ch1"], 
        channelGroups : ["cg1"],
        includeUUIDs: true,
        includeState: true 
    },
    function (status, response) {
        // handle status, response
    }
);

Presence

Subscribe to realtime Presence events, such as join, leave, and timeout, by UUID. Setting the presence attribute to a callback will subscribe to presents events on my_channel:

pubnub.subscribe({
	channels: ['my_channel'],
	withPresence: true
});

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

History

Retrieve published messages from archival storage:

pubnub.history(
    {
        channel: 'history_channel',
        count: 100, // how many items to fetch
        stringifiedTimeToken: true, // false is the default
    },
    function (status, response) {
        // handle status, response
    }
);

Unsubscribe

Stop subscribing (listening) to a channel.

pubnub.unsubscribe({
    channels: ['my_channel']
})

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

Get Code:

https://github.com/pubnub/javascript/releases

Get Code: CDN

Latest version

https://cdn.pubnub.com/sdk/javascript/pubnub.4.23.0.js

Latest minified version

https://cdn.pubnub.com/sdk/javascript/pubnub.4.23.0.min.js

Get Code: Source

https://github.com/pubnub/javascript

View Supported Platforms

Hello World

You must include the PubNub JavaScript SDK in your code before initializing the client.

Include PubNub JavaScript SDK

<script src="https://cdn.pubnub.com/sdk/javascript/pubnub.4.23.0.js"></script>

Example

function publish() {
  
    pubnub = new PubNub({
        publishKey : 'demo',
        subscribeKey : 'demo'
    })
      
    function publishSampleMessage() {
        console.log("Since we're publishing on subscribe connectEvent, we're sure we'll receive the following publish.");
        var publishConfig = {
            channel : "hello_world",
            message: { 
                title: "greeting",
                description: "hello world!"
            }
        }
        pubnub.publish(publishConfig, function(status, response) {
            console.log(status, response);
        })
    }
      
    pubnub.addListener({
        status: function(statusEvent) {
            if (statusEvent.category === "PNConnectedCategory") {
                publishSampleMessage();
            }
        },
        message: function(msg) {
            console.log(msg.message.title);
            console.log(msg.message.description);
        },
        presence: function(presenceEvent) {
            // handle presence
        }
    })      
    console.log("Subscribing..");
    pubnub.subscribe({
        channels: ['hello_world'] 
    });
};

Copy and paste examples

In addition to the Hello World sample code, we also provide some copy and paste snippets of common API functions:

Init

It is not a best practice to include the secretKey in client-side code for security reasons.

Set restore as true to allow catch up on the front-end applications.

Initializing the client

var pubnub = new PubNub({
	subscribeKey: "mySubscribeKey",
	publishKey: "myPublishKey",
	ssl: true
})

Listeners

Adding Listeners

pubnub.addListener({
    message: function(m) {
        // handle message
        var channelName = m.channel; // The channel for which the message belongs
        var channelGroup = m.subscription; // The channel group or wildcard subscription match (if exists)
        var pubTT = m.timetoken; // Publish timetoken
        var msg = m.message; // The Payload
        var publisher = m.publisher; //The Publisher
    },
    presence: function(p) {
        // handle presence
        var action = p.action; // Can be join, leave, state-change or timeout
        var channelName = p.channel; // The channel for which the message belongs
        var occupancy = p.occupancy; // No. of users connected with the channel
        var state = p.state; // User State
        var channelGroup = p.subscription; //  The channel group or wildcard subscription match (if exists)
        var publishTime = p.timestamp; // Publish timetoken
        var timetoken = p.timetoken;  // Current timetoken
        var uuid = p.uuid; // UUIDs of users who are connected with the channel
    },
    status: function(s) {
        var affectedChannelGroups = s.affectedChannelGroups; // The channel groups affected in the operation, of type array.
        var affectedChannels = s.affectedChannels; // The channels affected in the operation, of type array.
        var category = s.category; //Returns PNConnectedCategory
        var operation = s.operation; //Returns PNSubscribeOperation
        var lastTimetoken = s.lastTimetoken; //The last timetoken used in the subscribe request, of type long.
        var currentTimetoken = s.currentTimetoken; //The current timetoken fetched in the subscribe response, which is going to be used in the next request, of type long.
        var subscribedChannels = s.subscribedChannels; //All the current subscribed channels, of type array.
    }
});

Removing Listeners

var existingListener = {
    message: function() {
    } 
}

pubnub.removeListener(existingListener)

listeners status events

Categories	Description
`PNNetworkUpCategory`	SDK detected that network is online.
`PNNetworkDownCategory`	The SDK will announce this when connection is not available or this is not able to reach the PubNub Data Stream Network.
`PNNetworkIssuesCategory`	A subscribe event experienced an exception when running. The SDK is not being to able reach the PubNub Data Stream Network because the machine or device are not connected to Internet or this has been lost, your ISP (Internet Service Provider) is having to troubles or perhaps or the SDK is behind of a proxy.
`PNReconnectedCategory`	SDK was able to reconnect to pubnub.
`PNConnectedCategory`	SDK subscribed with a new mix of channels (fired every time the `channel` / `channel group` mix changed).
`PNAccessDeniedCategory`	PAM permission failure.
`PNMalformedResponseCategory`	JSON parsing crashed.
`PNBadRequestCategory`	The server responded with bad response because the request is malformed.
`PNDecryptionErrorCategory`	If using decryption strategies and the decryption fails.
`PNTimeoutCategory`	Failure to establish connection due to timeout.
`PNRequestMessageCountExceedCategory`	The SDK will announce this error if `requestMessageCountThreshold` is set and the number of messages arrived from (PubNub in memory cache messages) are greater than this.
`PNUnknownCategory`	This status code is returned when the subscriber get’s a non 200 HTTP response code from the server.

Time

Call time() to verify the client connectivity to the origin:

// assuming an initialized PubNub instance already exists
pubnub.time(function(status, response) {
	if (status.error) {
		// handle error if something went wrong based on the status object
	} else {
		console.log(response.timetoken);
	}
})

Subscribe (listen on) a channel

pubnub.subscribe({
    channels: ['my_channel'],
});

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

Publish

Publish a message to a channel:

pubnub.publish(
    {
        message: {
            such: 'object'
        },
        channel: 'ch1',
        sendByPost: false, // true to send via POST
        storeInHistory: false, //override default storage options
        meta: {
            "cool": "meta"
        } // publish extra meta with the request
    },
    function (status, response) {
        // handle status, response
    }
);

Here Now

Get occupancy of who's here now on the channel by UUID:

pubnub.hereNow(
    {
        channels: ["ch1"], 
        channelGroups : ["cg1"],
        includeUUIDs: true,
        includeState: true 
    },
    function (status, response) {
        // handle status, response
    }
);

Presence

Subscribe to realtime Presence events, such as join, leave, and timeout, by UUID. Setting the presence attribute to a callback will subscribe to presents events on my_channel:

pubnub.subscribe({
	channels: ['my_channel'],
	withPresence: true
});

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

History

Retrieve published messages from archival storage:

pubnub.history(
    {
        channel: 'history_channel',
        count: 100, // how many items to fetch
        stringifiedTimeToken: true, // false is the default
    },
    function (status, response) {
        // handle status, response
    }
);

Unsubscribe

Stop subscribing (listening) to a channel.

pubnub.unsubscribe({
    channels: ['my_channel']
})

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

Get Code: Source

https://github.com/pubnub/react

Get Code: NPM

npm install --save pubnub pubnub-react

View Supported Platforms

Hello World

PubNub React is a wrapper of PubNub JavaScript SDK version 4 that adds a few of extra features to simplify the integration with React\React Native:

Trigger Events: getMessage, getPresence, getStatus will make your life easier in the React' World.
Autoload: An easy and fast way to recovery the history messages of your channel.

You can still use the native PubNub JavaScript SDK if you feel this will be more suitable for your situation.

Differences in usage with native Javascript SDK

PubNub React is a wrapper of PubNub Javascript, which offers the same feature and in the same way like Javascript SDK makes, So if you have experience using Javascript SDK will be fast to learn the features included for React SDK in other way if you want to learn more about PubNub JavaScript features refer to native PubNub JavaScript SDK manual.

Differences between React and React Native

PubNub React works for both frameworks seamlessly the only difference will be how to you are going to implement all UI elements into the render() if your app is done with React or React Native.

That's it, you are ready to start using PubNub React SDK.

Example

Hello World Example

Hello World Example using React

import React, { Component } from 'react';
import PubNubReact from 'pubnub-react';

export default class extends Component {
    constructor(props) {
        super(props);
        this.pubnub = new PubNubReact({
            publishKey: 'YOUR PUBLISH KEY',
            subscribeKey: 'YOUR SUBSCRIBE KEY'
        });
        this.pubnub.init(this);
    }

    componentWillMount() {
        this.pubnub.subscribe({
            channels: ['channel1'],
            withPresence: true
        });

        this.pubnub.getMessage('channel1', (msg) => {
            console.log(msg);
        });

        this.pubnub.getStatus((st) => {
            this.pubnub.publish({
                message: 'hello world from react',
                channel: 'channel1'
            });
        });
    }

    componentWillUnmount() {
        this.pubnub.unsubscribe({
            channels: ['channel1']
        });
    }

    render() {
        const messages = this.pubnub.getMessage('channel1');
        return (
            <div>
                <ul>
                    {messages.map((m, index) => <li key={'message' + index}>{m.message}</li>)}
                </ul>
            </div>
        );
    }
}

Hello World Example using React Native

import React, { Component } from 'react';
import PubNubReact from 'pubnub-react';

export default class extends Component {
    constructor(props) {
        super(props);
        this.pubnub = new PubNubReact({
            publishKey: 'YOUR PUBLISH KEY',
            subscribeKey: 'YOUR SUBSCRIBE KEY'
        });
        this.pubnub.init(this);
    }

    componentWillMount() {
        this.pubnub.subscribe({
            channels: ['channel1'],
            withPresence: true        
        });

        this.pubnub.getMessage('channel1', (msg) => {
            console.log(msg);
        });

        this.pubnub.getStatus((st) => {
            this.pubnub.publish({
                message: 'hello world from react',
                channel: 'channel1'
            });
        });
    }

    componentWillUnmount() {
        this.pubnub.unsubscribe({
            channels: ['channel1']
        });
    }

    render() {
        const messages = this.pubnub.getMessage('channel1');
        return (
            <View>
                {messages.map((m, index) => <Text key={'message' + index}>{m.message}</Text>)}
            </View>
        );
    }
}

How to use PubNubReact

In order to get the integration between your React's Component and PubNub, PubNubReact will be the way to get this without any kind of difficulty or extra job when you need render data in your UI.

An instance of PubNubReact can be associated to only a Component.
Create and initialize your PubNubReact from the constructor.
If you want to subscribe a channel automatically as soon as the component will be displayed on the screen, you will have to subscribe it from the mounting point with the usage of componentWillMount() provided by React.
SDK will have created three states which are handled by the instance directly and these are pn_messages, pn_presence and pn_status please only use them in reading mode if you want to use them for any reason. In addition the trigger events will give you some extra features to manage the data allocated in theses states.

    import PubNubReact from 'pubnub-react';

    constructor(props) {
        super(props);
        this.pubnub = new PubNubReact({
            publishKey: 'YOUR PUBLISH KEY',
            subscribeKey: 'YOUR SUBSCRIBE KEY'
        });
        this.pubnub.init(this);
    }

    componentWillMount() {
        this.pubnub.subscribe({
            channels: ['channel1']
        });
  
        this.pubnub.getMessage('channel1', (msg) => {
            console.log(msg);
        });
    }

Events

Another key feature of this SDK is the ability to use trigger events, in addition to pass callbacks, getting all messages through states and inject them directly in your UI of your React\React Native Component in an easy and fast way.

Triggering and listening to events for the subscribe method

With Javascript SDK V4, you can find three different events (message, presence and status).

Triggering the events:

With the trigger events you can find a way to get real time apps with PubNub React very fast because it will be resolved the synchronization between the data received and the user interface through of updating of the states to invoke the render of the React's Component.

The trigger events are methods which encapsulate the events (message, presence and status) with extra functionality to offer integration and get the process of development faster because will be resolved different scenarios which you can find when you are working with React\React Native.

To execute the trigger events you have to execute the init() method first, in this way getMessage, getPresence and getStatus will be available; these trigger events have the responsability to register a channel or a channelGroup in order to capture any real time message as soon as this is received and update the state then the Component renders automatically the user interface.

The getStatus will only say to the Component that this has to render again if there is an update in the global state of the network.

To use getPresence you will have to add the argument withPresence: true when you are subscribing your channels.

    this.pubnub.getStatus();

    this.pubnub.getMessage('channel1');
    this.pubnub.getMessage('channel2');
    this.pubnub.getMessage('channelGroup1');

    this.pubnub.getPresence('channel1');
    this.pubnub.getPresence('channel2');

getMessage

Rendering real time messages from React

    ...

    componentWillMount() {
        this.pubnub.getMessage('channel1');

        ...
    }

    render() {
        const messages = this.pubnub.getMessage('channel1');
        return (
            <div>
                <ul>
                    {messages.map((m, index) => <li key={'message' + index}>{m.message}</li>)}
                </ul>
            </div>
        );
    }

    ...

Rendering real time messages from React Native

    ...

    componentWillMount() {
        this.pubnub.getMessage('channel1');

        ...
    }

    render() {
        const messages = this.pubnub.getMessage('channel1');
        return (
            <View>
                {messages.map((m) => <Text>{m.message}</Text>)}
            </View>
        );
    }

    ...

In addition to be used to register channels or channelGroups you can also catch each message if you want to give it some kind of procedure to each message.

    this.pubnub.getMessage('channel1', (msg) => {
        console.log(msg);
    });

When you are using getMessage this going to keep the latest 100 messages received by default. But you can change this value when you attach the channel for first time with getMessage.

    this.pubnub.getMessage('channel1', (msg) => {
        console.log(msg);
    }, 20);

    this.pubnub.getMessage('channel2', 30);

getPresence

Rendering presence object from react

    ...

    componentWillMount() {
        this.pubnub.getPresence('channel1', (presence) => {
            console.log(presence);
        });

        ...
    }

    render() {
      const presence = this.pubnub.getPresence('channel1');
      return (
        <div>
            <p>{presence.action}</p>
        </div>
      );
    }

    ...

Rendering presence object from React Native

    ...

    componentWillMount() {
        this.pubnub.getPresence('channel1', (presence) => {
            console.log(presence);
        });

    ...
    }

    render() {
        const presence = this.pubnub.getPresence('channel1');
        return (
            <View>
                <Text>{presence.action}</Text>
            </View>
        );
    }

    ...

Listening to the global status

Via the status listener, you can receive different events such as: when the network is online (PNNetworkUpCategory), when the SDK is connected to a set of channels (PNConnectedCategory), etc... See the list of events available in the API Reference.

Rendering the global status from React

    ...

    componentWillMount() {
        this.pubnub.getStatus((status) => {
            console.log(status);
        });

    ...
    }

    render() {
        const status = this.pubnub.getStatus();
        return (
            <div>
                <p>{status.category}</p>
            </div>
        );
    }

    ...

Rendering the global status from React Native

    ...

    componentWillMount() {
        this.pubnub.getStatus((status) => {
            console.log(status);
        });

    ...
    }

    render() {
        const status = this.pubnub.getStatus();
        return (
            <View>
                <Text>{status.category}</Text>
            </View>
        );
    }

    ...

Cleaning and Releasing

You can execute clean to remove all message cached in the state of the Component by the instance in running time without affecting the capture of new incoming messages for the trigger events.

    this.pubnub.clean('myChannel1');

    this.pubnub.clean('myGroup1');

You can execute release if you want to remove all message cached and stop of capturing new incoming messages for the trigger events.

    this.pubnub.release('myChannel1');

    this.pubnub.release('myGroup1');

    this.pubnub.release(['myChannel1', 'myChannel2']);

Getting the history with autoload

At the moment that you are subscribing a channel you can pass the optional parameter autoload this value has to contain a value from 1 to 100 in order to retrieve the last messages published in the channel. When the getMessage is called this going to retrieve the history. You can use a callback to know when the retrieving process has finished also this will take effect inside of state pn_message which will invoke a new render in your Component.

    this.pubnub.subscribe({
        channels: ['myChannel1'],
        triggerEvents: true,
        withPresence: true,
        autoload: 100
    });

    let messages = this.pubnub.getMessage('myChannel1', () => {
        console.log(messages);
    });

Copy and paste examples

In addition to the Hello World sample code, we also provide some copy and paste snippets of common API functions:

Init

It is not a best practice to include the secretKey in client-side code for security reasons.

Set restore as true to allow catch up on the front-end applications.

Initializing the client

this.pubnub = new PubNubReact({
    publishKey: 'YOUR PUBLISH KEY',
    subscribeKey: 'YOUR SUBSCRIBE KEY',
    ssl: true 
});

Listeners

Adding Listeners

this.pubnub.addListener({
    status: (st) => {
        if (st.category === "PNUnknownCategory") {
            var newState = {new: 'error'};
            pubnub.setState(
                {
                    state: newState
                },
                function (status) {
                    console.log(st.errorData.message);
                }
            );
        }
    },
    message: (message) => {
        console.log(message);
    }
});

this.pubnub.subscribe({ 
    channels: ['my_channel'] 
});

Removing Listeners

var existingListener = {
    message: function() {
    } 
}
 
this.pubnub.removeListener(existingListener)

listeners status events

Categories	Description
`PNNetworkUpCategory`	SDK detected that network is online.
`PNNetworkDownCategory`	The SDK will announce this when connection is not available or this is not able to reach the PubNub Data Stream Network.
`PNNetworkIssuesCategory`	A subscribe event experienced an exception when running. The SDK is not being to able reach the PubNub Data Stream Network because the machine or device are not connected to Internet or this has been lost, your ISP (Internet Service Provider) is having to troubles or perhaps or the SDK is behind of a proxy.
`PNReconnectedCategory`	SDK was able to reconnect to pubnub.
`PNConnectedCategory`	SDK subscribed with a new mix of channels (fired every time the `channel` / `channel group` mix changed).
`PNAccessDeniedCategory`	PAM permission failure.
`PNMalformedResponseCategory`	JSON parsing crashed.
`PNBadRequestCategory`	The server responded with bad response because the request is malformed.
`PNDecryptionErrorCategory`	If using decryption strategies and the decryption fails.
`PNTimeoutCategory`	Failure to establish connection due to timeout.
`PNRequestMessageCountExceedCategory`	The SDK will announce this error if `requestMessageCountThreshold` is set and the number of messages arrived from (PubNub in memory cache messages) are greater than this.
`PNUnknownCategory`	This status code is returned when the subscriber get’s a non 200 HTTP response code from the server.

Time

Call time() to verify the client connectivity to the origin:

this.pubnub.time((status, response) => {
    if (status.error) {
        console.log(status.error);
    } else {
        console.log(response.timetoken);
    }
});

Subscribe (listen on) a channel

this.pubnub.subscribe({
    channels: ['my_channel'],
});

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

Publish

Publish a message to a channel:

this.pubnub.publish(
    {
        message: {
            such: 'object'
        },
        channel: 'ch1',
        sendByPost: false, // true to send via POST
        storeInHistory: false, //override default storage options
        meta: {
            "cool": "meta"
        } // publish extra meta with the request
    },
    (status, response) => {
        // handle status, response
    }
);

Here Now

Get occupancy of who's here now on the channel by UUID:

this.pubnub.hereNow(
    {
        channels: ["my_channel"],
        channelGroups : ["my_channelGroup"],
        includeUUIDs: true,
        includeState: true
    },
    (status, response) => {
        console.log(status);
        console.log(response);
    }
);

Presence

Subscribe to realtime Presence events, such as join, leave, and timeout, by UUID. Setting the presence attribute to a callback will subscribe to presents events on my_channel:

this.pubnub.subscribe({
    channels: ['my_channel'],
    withPresence: true
});

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

History

Retrieve published messages from archival storage:

this.pubnub.history(
    {
        channel: 'my_channel',
        count: 100, // 100 is the default
        stringifiedTimeToken: true // false is the default
    },
    (status, response) => {
        console.log(response);
    }
);

Unsubscribe

Stop subscribing (listening) to a channel.

this.pubnub.unsubscribe({
    channels : ['my_channel']
});

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

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