Based on a feature available with Oracle Maxymiser - a beneficial functionality they had was the ability to run a function when the targeting for Single Page Application no longer qualifies e.g. when the page URL changes to something not matching the targeting of a campaign.

This was typically used to remove content that was added to the DOM due to the campaign script that wouldn't be removed when the URL/elements change.

Example:

Targeting: https://book.nationalexpress.com/coach/#/choose-journey

Campaign Script:

Once the user proceeds to a different page, like https://stable.nationalexpress.com/coach/#/choose-fare, run a rollback function (as targeting no longer suffices) to remove the banner.

Here's what it looked like in Oracle Maxymiser:

spa.when([

spa.conditions.location(['https://book.nationalexpress.com/my-account/#/mytickets/activejourney', 'https://ptbook.nationalexpress.com/my-account/#/mytickets/activejourney']),

spa.conditions.element('app-ticket-item-tickettype > div > .text-right > p'),

]).then(() => {

// If conditions match

// We do our script

}).rollback(() => {

// We revert changes when the conditions no longer match

});