Product events

Product events are events such as creating a change, updating a change, and so on, that occur in the product on which your app is deployed. You can enable product events to trigger your app, call a corresponding callback function, and execute the app logic.

To do this,

  1. From your app’s root directory, navigate to the manifest.json file.

  2. Subscribe to an event by configuring an event listener: Include the events attribute, specifying the product-event's name and the corresponding callback methods as follows:

    manifest.json
     "events": {
   "<productEventName>": {
       "handler": "<eventCallbackMethod>"
   }
 }

    When the event occurs, the corresponding event listener invokes the callback method and passes a standard payload to the method.

  3. Navigate to the server.js file. In the exports block, enter the callback function definition as follows:

    Sample server.js
     exports = {
   // args is a JSON block containing the payload information
   // args["iparam"] will contain the installation parameter values
   //eventCallbackMethod is the call-back function name specified in manifest.json
   eventCallbackMethod: function(args) {
     console.log("Logging arguments from the event: " + JSON.stringify(payload));
   }};
Notes:
  • The serverless component of the app is executed in a sandbox mode where some methods, such as setTimeout and setInterval, cannot be used.
  • The default app execution timeout is 20 seconds. If the request timeout is increased to 20, 25, or 30 seconds, the app execution timeout is extended to 40 seconds.
  • The payload passed to the severless component should not exceed 256 KB.
  • To know all the platform restrictions and constraints, see Rate limits and constraints.
  • Avoid using symbols, such as arrows, in the code when defining the event, as they may cause errors.

Payload attributes

When a product event occurs, an event-specific payload is passed to the callback method.

The payload is a JSON object with the following attributes.