start

The start command may be used to manually start a session.

To start the collection of behavior signals for a user transaction, use the start command. The start command takes optional additional parameters to separate the signals collected across multiple pages in your application. The NeuroID JavaScript library will autostart by default, and manually starting the collection is not recommended for most users.

JavaScript

<!-- Calling start (legacy) -->
nid('start');

<!-- Optionally calling start with a page identifier -->
nid('start', page_identifier);

<!-- Optionally calling start with a callback function -->
<!-- Creates and returns an NID generated sessionId -->
<!-- Available in versions V5.2.0 and later -->
nid('start', function(result) {
    console.log(result.sessionId);
    console.log(result.status);
});

<!-- Optionally calling start with additional options -->
<!-- Can be used to set linkedSiteId, sessionId and page identifier from start -->
<!-- Available in versions V5.2.7 and later -->
nid('start', { sessionId: session-id, pageUrl: url, linkedSiteId: form_linkd123 });

<!-- Optionally calling start with additional options, and a callback function -->
<!-- Sets the values provided in additionaloptions and creates an NID generated sessionId if not provided -->
<!-- Available in versions V5.3.0 and later -->
nid('start', { linkedSiteId: form_linkd123, pageUrl: url  } , function(result) {
    console.log(result.sessionId);
    console.log(result.status);
});

Parameters

• start: command
• page_identifier (string): name of the page on which signal collecting is starting.
  You may optionally pass the start command a page_identifier value as a parameter. This page_identifer value uniquely identifies a given page throughout the entire form.
  For the best user experience, NeuroID recommends that this value represent what you internally refer to the page to assist in consistent uniform communication between your application and NeuroID.
  Examples of page_identifier values are step_1, personal_information, bank_info, loan_offers, etc.
• Optional params object: An object with a list of properties passed in by the customer as key value pairs
  • Supported properties:
    • linkedSiteId: The siteId of the use-case that data collection is starting for.
    • sessionId: Customer provided sessionId
    • pageUrl: Customer provided page identifier value
• function(result): Calling start with a callback function will generate a nid assigned identityId when the script is started. This option is provided if you wish to call the API for signals before you have your own identityId available.

Manual Start

The following steps outlined how to start the JavaScript manually:

1. Set autostart to false in the JavaScript configuration
   Set 'autoStart':false in your site's JavaScript configuration in the portal. Don't forget to save the changes.
2. Add start tag to your site's code
   JavaScript

     nid('start', page_identifier);
   

   The start command should be called in your code where you'd like to start tracking inputs.
3. Set a unique identifier
   JavaScript

   nid('identify', identity_id);
   

   Call nid('identify', identity_id); to provide a unique identifier for the applicant after the nid('start', page_identifier) command is called.

   ❗️

   The NeuroID JavaScript library identifies the state of the application during interaction based on the passed in page_identifier.

   Due to page redirects, hard page reloads, page refreshes, and updates of views, the NeuroID JavaScript library requires the start command to be called on every page load.

   Calling start multiple times has no adverse impact and allows NeuroID to collect data on complicated forms with multiple entry and exit points.

Considerations

The NeuroID JavaScript library identifies the state of the application during interaction based on the page_identifier parameter.

Due to page redirects, hard page reloads, page refreshes, and updates of views, the NeuroID JavaScript library requires the start command to be called on every page load.

Calling start multiple times has no adverse impact and allows NeuroID to collect data on complicated forms with multiple entry and exit points.

❗️

iframes

If users access your application through an iframe embedded on a page outside of your domain, calling nid('start'); multiple times may result in an error.

When using the manual start option with iframes, call start only once and use the stateChange command to pass NeuroID additional context around view or page changes.

Immediate Start

Because the NeuroID JavaScript is loaded asynchronously, you cannot call start immediately after the load call in the <head> as this will introduce a race condition.

If you want to load the JavaScript and have it start immediately, you will need to modify the JavaScript snippet as shown here:

JavaScript

(function(n,e,u,r,o,i,d){
       n.nid=n.nid||function(){(n.nid.q=n.nid.q||[]).push(arguments)},n.nid.q=n.nid.q||[];
       o=e.createElement(u);i=e.getElementsByTagName(u)[0];o.async=1;
       o.src=r;i.parentNode.insertBefore(o,i);
       n.nid.q=[['start', page_id_variable]].concat(n.nid.q);
})(window,document,'script','//scripts.neuro-id.com/c/nid-YOUR_SITEID_HERE.js');