TaskRouter.js TaskQueue: Managing a TaskQueue resource in the browser
The SDK allows developers to interact with the entire TaskRouter REST API by a simple JS API.
Adding the SDK to your application
Include the TaskRouter JS SDK in your JavaScript application as follows:
<script src="https://sdk.twilio.com/js/taskrouter/v1.21/taskrouter.min.js" integrity="sha384-5fq+0qjayReAreRyHy38VpD3Gr9R2OYIzonwIkoGI4M9dhfKW6RWeRnZjfwSrpN8" crossorigin="anonymous"></script>
Creating a TaskRouter TaskQueue capability token
TaskRouter uses Twilio capability tokens to delegate scoped access to TaskRouter resources to your JavaScript application. Twilio capability tokens conform to the JSON Web Token (commonly referred to as a JWT and pronounced "jot") standard, which allow for limited-time use of credentials by a third party. Your web server needs to generate a Twilio capability token and provide it to your JavaScript application in order to register a TaskRouter TaskQueue.
We provide three relevant helper methods to provide access capabilities:
| Capability | Authorization |
|---|---|
| AllowFetchSubresources | A TaskQueue can fetch any subresource (statistics) |
| AllowUpdates | A TaskQueue can update its properties |
| AllowDelete | A TaskQueue can delete itself |
Additionally, you can utilize more granular access to particular resources beyond these capabilities. These can viewed under Constructing JWTs.
You can generate a TaskRouter capability token using any of Twilio's Helper Libraries. You'll need to provide your Twilio AccountSid and AuthToken, the WorkspaceSid the TaskQueue belongs to and the TaskQueueSid you would like to register. For example, using our PHP helper library you can create a token and add capabilities as follows:
Once you have generated a TaskRouter capability token, you can pass this to your front-end web application and intialize the JavaScript library as follows:
var taskQueue = new Twilio.TaskRouter.TaskQueue(TASKQUEUE_TOKEN);
The library will raise a 'ready' event once it has connected to TaskRouter:
taskQueue.on("ready", function(taskQueue) {
console.log(taskQueue.sid) // 'WQxxx'
console.log(taskQueue.friendlyName) // 'Simple FIFO Queue'
console.log(taskQueue.targetWorkers) // '1==1'
console.log(taskQueue.maxReservedWorkers) // 20
});
See more about the methods and events exposed on this object below.
TaskQueue API
TaskRouter.js TaskQueue exposes the following API:
Twilio.TaskRouter.TaskQueue
Twilio.TaskRouter.TaskQueue is the top-level class you'll use for managing a TaskQueue.
new Twilio.TaskRouter.TaskQueue(taskQueueToken)
Register a new Twilio.TaskRouter.TaskQueue with the capabilities provided in taskQueueToken.
Parameters
| Name | Type | Description |
|---|---|---|
| taskQueueToken | String | A Twilio TaskRouter capability token. See Creating a TaskRouter capability token for more information. |
| debug | Boolean | (optional) Whether or not the JS SDK will print event messages to the console. Defaults to true. |
| region | String | (optional) A Twilio region for websocket connections (ex. ie1-ix). |
| maxRetries | Integer | (optional) The maximum of retries to attempt if a websocket request fails. Defaults to 0. |
Sample usage
var taskQueue = new Twilio.TaskRouter.TaskQueue(TASKQUEUE_TOKEN);
Turning off debugging:
var taskQueue = new Twilio.TaskRouter.TaskQueue(TASKQUEUE_TOKEN, false);
Methods
update([args...], [resultCallback])
Updates a single or list of properties on a TaskQueue.
Parameters
| Name | Type | Description |
|---|---|---|
| args... | String or JSON | A single API parameter and value or a JSON object containing multiple values |
| resultCallback | Function | (optional) A JavaScript Function that will be called with the result of the update. If an error occurs, the first argument passed to this function will be an Error. If the update is successful, the first argument will be null and the second argument will contain the updated TaskQueue. |
Single Attribute Example
taskQueue.update("MaxReservedWorkers", "20", function(error, taskQueue) {
if(error) {
console.log(error.code);
console.log(error.message);
} else {
console.log(taskQueue.maxReservedWorkers); // 20
}
});
Multiple Attribute Example
var targetWorkers = "languages HAS \"english\"";
var props = {"MaxReservedWorkers", "20", "TargetWorkers":targetWorkers};
taskQueue.update(props, function(error, workspace) {
if(error) {
console.log(error.code);
console.log(error.message);
} else {
console.log(taskQueue.maxReservedWorkers); // "20"
console.log(taskQueue.targetWorkers); // "languages HAS "english""
}
});
delete([resultCallback])
Deletes a TaskQueue
Parameters
| Name | Type | Description |
|---|---|---|
| resultCallback | Function | (optional) A JavaScript Function that will be called with the result of the delete. If an error occurs, the first argument passed to this function will be an Error. If the delete is successful, the first argument will be null. |
Example
taskQueue.delete(function(error) {
if(error) {
console.log(error.code);
console.log(error.message);
} else {
console.log("taskQueue deleted");
}
});
updateToken(taskQueueToken)
Updates the TaskRouter capability token for the Workspace.
Parameters
| Name | Type | Description |
|---|---|---|
| taskQueueToken | String | A valid TaskRouter capability token. |
Example
var token = refreshJWT(); // your method to retrieve a new capability token
taskQueue.updateToken(token);
statistics
Retrieves the object to retrieve the statistics for a TaskQueue.
fetch
Parameters
| Name | Type | Description |
|---|---|---|
| params | JSON | (optional) A JSON object of query parameters |
| callback | Function | A function that will be called when the statistics object is returned. If an error occurs when retrieving the list, the first parameter passed to this function will contain the Error object. If the retrieval is successful, the first parameter will be null and the second parameter will contain a statistics object. |
var queryParams = {"Minutes":"240"}; // 4 hours
taskQueue.statistics.fetch(
queryParams,
function(error, statistics) {
if(error) {
console.log(error.code);
console.log(error.message);
return;
}
console.log("fetched taskQueue statistics: "+JSON.stringify(statistics));
console.log("avg task acceptance time: "+statistics.cumulative.avgTaskAcceptanceTime;
}
);
cumulative statistics
If you only care about the cumulative stats for a TaskQueue for a given time period, you can utilize this instead of the above for a smaller payload and faster response time.
fetch
Parameters
| Name | Type | Description |
|---|---|---|
| params | JSON | (optional) A JSON object of query parameters |
| callback | Function | A function that will be called when the statistics object is returned. If an error occurs when retrieving the list, the first parameter passed to this function will contain the Error object. If the retrieval is successful, the first parameter will be null and the second parameter will contain a statistics object. |
var queryParams = {"Minutes":"240"}; // 4 hours
taskQueue.cumulativeStats.fetch(
queryParams,
function(error, statistics) {
if(error) {
console.log(error.code);
console.log(error.message);
return;
}
console.log("fetched taskQueue statistics: "+JSON.stringify(statistics));
console.log("avg task acceptance time: "+statistics.avgTaskAcceptanceTime;
}
);
real time statistics
If you only care about the realtime stats for a TaskQueue for a given time period, you can utilize this instead of the above for a smaller payload and faster response time.
fetch
Parameters
| Name | Type | Description |
|---|---|---|
| params | JSON | (optional) A JSON object of query parameters |
| callback | Function | A function that will be called when the statistics object is returned. If an error occurs when retrieving the list, the first parameter passed to this function will contain the Error object. If the retrieval is successful, the first parameter will be null and the second parameter will contain a statistics object. |
taskQueue.realtimeStats.fetch(
function(error, statistics) {
if(error) {
console.log(error.code);
console.log(error.message);
return;
}
console.log("fetched taskQueue statistics: "+JSON.stringify(statistics));
console.log("total available workers: "+statistics.totalAvailableWorkers;
console.log("total eligible workers: "+statistics.totalEligibleWorkers;
}
);
on(event, callback)
Attaches a listener to the specified event. See Events for the complete list of supported events.
Parameters
| Name | Type | Description |
|---|---|---|
| event | String | An event name. See Events for the complete list of supported events. |
| callback | Function | A function that will be called when the specified Event is raised. |
Example
taskQueue.on("ready", function(taskQueue) {
console.log(taskQueue.friendlyName) // My TaskQueue
});
Events
TaskRouter's JS library currently raises the following events to the registered TaskQueue:
ready
The TaskQueue has established a connection to TaskRouter and has completed initialization.
Parameters
| Name | Type | Description |
|---|---|---|
| taskQueue | TaskQueue | The created TaskQueue. |
Example
taskQueue.on("ready", function(taskQueue) {
console.log(taskQueue.friendlyName) // My TaskQueue
});
connected
The TaskQueue has established a connection to TaskRouter.
Example
taskQueue.on("connected", function() {
console.log("Websocket has connected");
});
disconnected
The TaskQueue has disconnected a connection from TaskRouter.
Example
taskQueue.on("disconnected", function() {
console.log("Websocket has disconnected");
});
token.expired
Raised when the TaskRouter capability token used to create this TaskQueue expires.
Example
taskQueue.on("token.expired", function() {
console.log("updating token");
var token = refreshJWT(); // your method to retrieve a new capability token
taskQueue.updateToken(token);
});
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