Extend cookie lifetime

By default, whenever the snippet activates, it resaves any existing Optimizely Web Experimentation visitor ID cookie onto the currently configured cookieDomain and with the currently configured cookieExpiration.

For example, if you use the Cookie Expiration API to specify a lifetime of 365 days, you can use extend cookie lifetime to disable the automatic lifetime extension, ensuring the cookie's expiration does not get refreshed on each snippet activation. As a result, the cookie would expire 365 days after it was created.

Call this API with isEnabled: false to prevent Web Experimentation from automatically extending the expiration period of the visitor ID cookie.

• A visitor ID cookie whose value does not change during snippet activation (for example, most returning visitors') retain the original domain and expiration date that was specified when the cookie was set (during a prior snippet activation).
• A visitor ID cookie that is new (for example, a new visitor's) or whose value is modified (due to having been synced from another origin through waitForOriginSync, for example), are set as normal, using the currently-configured cookieDomain and cookieExpiration.

You must call this prior to each snippet initialization to suppress the cookie-extending behavior.

Syntax

window["optimizely"].push(extendCookieLifetime);

Parameters

Example call

window["optimizely"].push({
  "type": "extendCookieLifetime",
  "isEnabled": false
});