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));
      }};

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.