Documentation Experience Platform Web SDK Guide

Monitoring hooks for Web SDK

Last update: November 7, 2024

Topics:
Web SDK

CREATED FOR:

Developer

The Adobe Experience Platform Web SDK includes monitoring hooks which you can use to monitor various system events. These tools are useful for developing your own debugging tools and to capture Web SDK logs.

The Web SDK triggers the monitoring functions regardless of whether you have enabled debugging.

`onInstanceCreated`

This callback function is triggered when you have successfully created a new Web SDK instance. See the sample below for details about the function parameters.

onInstanceCreated(data) {
    // data.instanceName
    // data.instance
}

Parameter	Type	Description
`data.instanceName`	String	The name of the global variable where the Web SDK instance is stored.
`data.instance`	Function	The instance function used to call Web SDK commands.

`onInstanceConfigured`

This callback function is triggered by the Web SDK when the configure command is successfully resolved. See the sample below for details about the function parameters.

 onInstanceConfigured(data) {
     // data.instanceName
     // data.config
 }

Parameter	Type	Description
`data.instanceName`	String	The name of the global variable where the Web SDK instance is stored.
`data.config`	Object	An object containing the configuration you used for your Web SDK instance. These are the options passed to the `configure` command with all the default values added.

`onBeforeCommand`

This callback function is triggered by Web SDK before any other command is executed. You can use this function to retrieve the configuration options of a specific command. See the sample below for details about the function parameters.

onBeforeCommand(data) {
    // data.instanceName
    // data.commandName
    // data.options
}

Parameter	Type	Description
`data.instanceName`	String	The name of the global variable where the Web SDK instance is stored.
`data.commandName`	String	The name of the Web SDK command before which this function is executed.
`data.options`	Object	An object containing the options passed to the Web SDK command.

`onCommandResolved`

This callback function is triggered when resolving command promises. You can use this function to see the command options and result. See the sample below for details about the function parameters.

onCommandResolved(data) {
    // data.instanceName
    // data.commandName
    // data.options
    // data.result
},

Parameter	Type	Description
`data.instanceName`	String	The name of the global variable where the Web SDK instance is stored.
`data.commandName`	String	The name of the executed Web SDK command.
`data.options`	Object	An object containing the options passed to the Web SDK command.
`data.result`	Object	An object containing the result of the Web SDK command.

`onCommandRejected`

This callback function is triggered before a command promise is rejected and it contains information about the reason why the command was rejected. See the sample below for details about the function parameters.

onCommandRejected(data) {
    // data.instanceName
    // data.commandName
    // data.options
    // data.error
}

Parameter	Type	Description
`data.instanceName`	String	The name of the global variable where the Web SDK instance is stored.
`data.commandName`	String	The name of the executed Web SDK command.
`data.options`	Object	An object containing the options passed to the Web SDK command.
`data.error`	Object	An object containing the error message returned from the browser’s network call (`fetch` in most cases), along with the reason why the command was rejected.

`onBeforeNetworkRequest`

This callback function is triggered before a network request is executed. See the sample below for details about the function parameters.

onBeforeNetworkRequest(data) {
    // data.instanceName
    // data.requestId
    // data.url
    // data.payload
}

Parameter	Type	Description
`data.instanceName`	String	The name of the global variable where the Web SDK instance is stored.
`data.requestId`	String	The `requestId` generated by Web SDK to enable debugging.
`data.url`	String	The requested URL.
`data.payload`	Object	The network request payload object that will be converted to JSON format and sent in the body of the request, through a `POST` method.

`onNetworkResponse`

This callback function is triggered when the browser receives a response. See the sample below for details about the function parameters.

onNetworkResponse(data) {
    // data.instanceName
    // data.requestId
    // data.url
    // data.payload
    // data.body
    // data.parsedBody
    // data.status
    // data.retriesAttempted
}

Parameter	Type	Description
`data.instanceName`	String	The name of the global variable where the Web SDK instance is stored.
`data.requestId`	String	The `requestId` generated by Web SDK to enable debugging.
`data.url`	String	The requested URL.
`data.payload`	Object	The payload object that will be converted to JSON format and sent in the body of the request, through a `POST` method.
`data.body`	String	The response body in string format.
`data.parsedBody`	Object	An object containing the parsed response body. If an error occurs while parsing the response body, this parameter is undefined.
`data.status`	String	The response code in integer format.
`data.retriesAttempted`	Integer	The number of retries attempted when sending the request. Zero means the request was successful on the first try.

`onNetworkError`

This callback function is triggered when the network request failed. See the sample below for details about the function parameters.

onNetworkError(data) {
    // data.instanceName
    // data.requestId
    // data.url
    // data.payload
    // data.error
},

Parameter

Type

Description

data.instanceName

String

The name of the global variable where the Web SDK instance is stored.

data.requestId

String

The requestId generated by Web SDK to enable debugging.

data.url

String

The requested URL.

data.payload

Object

The payload object that will be converted to JSON format and sent in the body of the request, through a POST method.

data.error

Object

An object containing the error message returned from the browser’s network call (fetch in most cases), along with the reason why the command was rejected.

`onBeforeLog`

This callback function is triggered before the Web SDK logs anything to the console. See the sample below for details about the function parameters.

onBeforeLog(data) {
    // data.instanceName
    // data.componentName
    // data.level
    // data.arguments
}

Parameter

Type

Description

data.instanceName

String

The name of the global variable where the Web SDK instance is stored.

data.componentName

String

The name of the component that generated the log message.

data.level

String

The logging level. Supported levels: log, info, warn, error.

data.arguments

String array

The arguments of the log message.

`onContentRendering`

This callback function is triggered by the personalization component at various stages of rendering. The payload can differ, depending on the status parameter. See the sample below for details about the function parameters.

 onContentRendering(data) {
     // data.instanceName
     // data.componentName
     // data.payload
     // data.status
}

Parameter

Type

Description

data.instanceName

String

The name of the global variable where the Web SDK instance is stored.

data.componentName

String

The name of the component that generated the log message.

data.payload

Object

The payload object that will be converted to JSON format and sent in the body of the request, through a POST method.

data.status

String

The personalization component notifies the Web SDK of the status of rendering. Supported values:

rendering-started: Indicates that the Web SDK is about to render propositions. Before the Web SDK starts to render a decision scope or a view, in the data object you can see the propositions that are about to be rendered by the personalization component and the scope name.
no-offers: Indicates that no payload was received for the requested parameters.
rendering-failed: Indicates that Web SDK failed to render a proposition.
rendering-succeeded: Indicates that rendering has completed for a decision scope.
rendering-redirect: Indicates that Web SDK will render a redirect proposition.

`onContentHiding`

This callback function is triggered when a prehiding style is applied or removed.

onContentHiding(data) {
    // data.instanceName
    // data.componentName
    // data.status
}

Parameter

Type

Description

data.instanceName

String

The name of the global variable where the Web SDK instance is stored.

data.componentName

String

The name of the component that generated the log message.

data.status

String

The personalization component notifies the Web SDK of the status of rendering. Supported values:

hide-containers
show-containers

How to specify monitoring hooks when using the NPM package

If you are using the Web SDK through the NPM package, you can specify monitoring hooks in the createInstasnce function, as shown below.

var monitor = {
  onBeforeCommand(data) {
    console.log(data);
  },
  ...
};
var alloyLibrary = require("@adobe/alloy");
var alloy = alloyLibrary.createInstance({ name: "alloy", monitors: [monitor] });
alloy("config", { ... });
alloy("sendEvent", { ... });

Example

The Web SDK looks for an array of objects in a global variable called __alloyMonitors.

To capture all Web SDK events, you must define your monitoring hooks before the Web SDK code is loaded on your page. Each monitoring method captures a Web SDK event.

You may define monitoring hooks after Web SDK code loads on your page, but any hooks that have triggered before page load will not be captured.

When you define your monitoring hook object, you only need to define the methods that you would like to define special logic for.
For example, if you only care about onContentRendering, you can just define that method. You do not need to use all monitoring hooks at once.

You can define multiple monitoring hook objects. All the objects with the given method will be called when the corresponding event is triggered.

TIP

See below an example page with all the monitoring hooks implemented.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <script>
    window.__alloyMonitors = window.__alloyMonitors || [];
    window.__alloyMonitors.push({
      onInstanceCreated(data) {
        // data.instanceName
        // data.instance
      },
      onInstanceConfigured(data) {
        // data.instanceName
        // data.config
      },
      onBeforeCommand(data) {
        // data.instanceName
        // data.commandName
        // data.options
      },
      // Added in version 2.4.0
      onCommandResolved(data) {
        // data.instanceName
        // data.commandName
        // data.options
        // data.result
      },
      // Added in version 2.4.0
      onCommandRejected(data) {
        // data.instanceName
        // data.commandName
        // data.options
        // data.error
      },
      onBeforeNetworkRequest(data) {
        // data.instanceName
        // data.requestId
        // data.url
        // data.payload
      },
      onNetworkResponse(data) {
        // data.instanceName
        // data.requestId
        // data.url
        // data.payload
        // data.body
        // data.parsedBody
        // data.status
        // data.retriesAttempted
      },
      onNetworkError(data) {
        // data.instanceName
        // data.requestId
        // data.url
        // data.payload
        // data.error
      },
      onBeforeLog(data) {
        // data.instanceName
        // data.componentName
        // data.level
        // data.arguments
      }
      onContentRendering(data) {
        // data.instanceName
        // data.componentName
        // data.payload
        // data.status
      },
      onContentHiding(data) {
        // data.instanceName
        // data.componentName
        // data.status
      }
    });
  </script>
  <script>
      !function(n,o){o.forEach(function(o){n[o]||((n.__alloyNS=n.__alloyNS||
      []).push(o),n[o]=function(){var u=arguments;return new Promise(
      function(i,l){n[o].q.push([i,l,u])})},n[o].q=[])})}
      (window,["alloy"]);
    </script>
    <script src="alloy.js" async></script>
</head>
<body>
  <h1>Monitor Test</h1>
</body>
</html>

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