Presence API for PubNub Angular2 SDK
Presence enables you to track the online and offline status of users and devices in real time, as well as store custom state information. Presence provides authoritative information on:
- When a user has joined or left a channel
- Who, and how many, users are subscribed to a particular channel
- Which channel(s) an individual user is subscribed to
- Associated state information for these users
Learn more about our Presence feature here.
Here Now
Requires Presence add-on
This method requires that the Presence add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.
You can obtain information about the current state of a channel including a list of unique user-ids currently subscribed to the channel and the total occupancy count of the channel by calling the hereNow() function in your application.
Cache
This method has a 3 second response cache time.
Method(s)
To call Here Now you can use the following method(s) in the Angular2 SDK:
hereNow( {Array channels, Array channelGroups, Boolean includeUUIDs, Boolean includeState}, Function callback )
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
| Operation Arguments | Hash | Yes | A hash of arguments. | |
channels | Array | Optional | Specifies the channel name to return occupancy results. If channel is not provided, hereNow() will return data for all channels. | |
channelGroups | Array | Optional | The channel group for which here now information should be received. | |
includeUUIDs | Boolean | Optional | true | Setting uuid to false disables the return of uuids. |
includeState | Boolean | Optional | false | Setting state to true enables the return of subscriber state information. |
callback | Function | Optional | Executes on a successful/unsuccessful hereNow. |
Basic Usage
Get a list of uuids subscribed to channel
pubnub.hereNow(
{
channels: ["my_channel"],
channelGroups : ["my_channelGroup"],
includeUUIDs: true,
includeState: true
},
function (status, response) {
console.log(status);
console.log(response);
}
);
Response
// Example of Status
{
error: false,
operation: "PNHereNowOperation",
statusCode: 200
}
// Example of Response
{
totalChannels: 1,
totalOccupancy: 3,
channels: {
myChannel1: {
occupants: [
{
Other Examples
Returning State
Requires Presence add-on
This method requires that the Presence add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.
pubnub.hereNow(
{
channels: ["my_channel"],
includeState: true
},
function (status, response) {
// handle status, response
}
);
Example Response
// Example of Status
{
"error": false,
"operation": "PNHereNowOperation",
"statusCode": 200
}
// Example of Response
{
"totalChannels": 1,
"totalOccupancy": 3,
"channels": {
"my_channel": {
"occupants": [
{
Return Occupancy Only
Requires Presence add-on
This method requires that the Presence add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.
You can return only the occupancy information for a single channel by specifying the channel and setting UUIDs to false:
pubnub.hereNow(
{
channels: ["my_channel"],
includeUUIDs: false
},
function (status, response) {
// handle status, response
}
);
Example Response
// Example of Status
{
"error": false,
"operation": "PNHereNowOperation",
"statusCode": 200
}
// Example of Response
{
"totalChannels": 1,
"totalOccupancy": 3,
"channels": {
"my_channel": {
"occupants": [],
"name": "my_channel",
Channel Group Usage
Requires Presence add-on
This method requires that the Presence add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.
pubnub.hereNow(
{
channelGroups : ["my_channelGroup"]
},
function (status, response) {
// handle status, response
}
);
Example Response
// Example of Status
{
"error": false,
"operation": "PNHereNowOperation",
"statusCode": 200
}
// Example of Response
{
"totalChannels": 2,
"totalOccupancy": 3,
"channels": {
"my_channel_1": {
"occupants": [
{
Where Now
Requires Presence add-on
This method requires that the Presence add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.
You can obtain information about the current list of channels to which a UUID is subscribed to by calling the whereNow function in your application.
Note
If the app is killed/crashes and restarted (or the page containing the PubNub instance is refreshed on the browser) within the heartbeat window no timeout event is generated.
Method(s)
To call whereNow you can use the following method(s) in the Angular2 SDK:
whereNow ({String uuid},Function callback)
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
| Operation Arguments | Hash | Yes | A hash of arguments. | |
uuid | String | Optional | current uuid | Specifies the uuid to return channel list for. |
callback | Function | Optional | Executes on a successful/unsuccessful whereNow. |
Basic Usage
You simply need to define the uuid and the callback function to be used to send the data to as in the example below.
Get a list of channels a UUID is subscribed to
pubnub.whereNow(
{
uuid: 'my_uuid'
},
function (status, response) {
// handle status, response
}
);
Response
// Example of Status
{
error: false,
operation: "PNWhereNowOperation",
statusCode: 200
}
// Example of Response
{
"channels": ["ch1", "ch2"]
}
Other Examples
Basic usage using Promises
pubnub.whereNow({
uuid: 'my_uuid'
}).then((response) => {
console.log(response);
}).catch((error) => {
console.log(error);
});
User State
Requires Presence add-on
This method requires that the Presence add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.
The state API is used to set/get key/value pairs specific to a subscriber uuid.
State information is supplied as a JSON object of key/value pairs.
Method(s)
Set State
setState({Array channels, Array channelGroups, Object state},Function callback)
| Parameter | Type | Required | Description |
|---|---|---|---|
| Operation Arguments | Hash | Yes | A hash of arguments. |
channels | Array | Optional | Either channels or channelGroups should be provided, Specifies the channels to set the state. |
channelGroups | Array | Optional | Either channels or channelGroups should be provided, Specifies the Channel Group to set the state |
state | Object | Optional | JSON object of key/value pairs with supported data-types of int, float and string. Nesting of key/values is not permitted and key names beginning with prefix pn are reserved. If the state parameter is undefined, the current state for the specified uuid will be returned. If a specified key already exists for the uuid it will be over-written with the new value. Key values can be deleted by setting the particular value to null. |
callback | Function | Optional | Executes on a successful/unsuccessful setState. |
Get State
getState({String uuid, Arraychannels, ArraychannelGroups},Function callback)
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
| Operation Arguments | Hash | Yes | A hash of arguments. | |
uuid | String | Optional | current uuid | The subscriber uuid to get the current state. |
channels | Array | Optional | Either channels or channelGroups should be provided, Specifies the channels to get the state. | |
channelGroups | Array | Optional | Either channels or channelGroups should be provided, Specifies the Channel Group to get the state. | |
callback | Function | Optional | Executes on a successful/unsuccessful getState. |
Basic Usage
Set State
pubnub.setState(
{
state: {
"Key": "Value"
},
channels: ["my_channel"]
},
function (status, response) {
// handle status, response
}
);
Get State
pubnub.getState(
{
uuid : "my_uuid",
channels : ["my_channel"]
},
function (status, response) {
// handle status, response
}
);
Response
Set State
// Example of Status
{
error: false,
operation: "PNSetStateOperation",
statusCode: 200
}
// Example of Response
{
state: {
me: 'typing'
}
}
Get State
// Example of Status
{
error: false,
operation: "PNGetStateOperation",
statusCode: 200
}
// Example of Response
{
channels: {
ch1: {
me: 'typing'
}
}
}
Other Examples
Set State Basic usage using Promises*
pubnub.setState({
state: {
"Key": "Value"
},
channels: ["my_channel"]
}).then((response) => {
console.log(response);
}).catch((error) => {
console.log(error);
});
Get State Basic usage using Promises
pubnub.getState({
uuid : "my_uuid",
channels : ["my_channel"]
}).then((response) => {
console.log(response);
}).catch((error) => {
console.log(error);
});