How to pagination that the URL does not change

Hi all,

Im trying to scrap images from website but got stuck on the pagination stuff since the URL doesnt change when moving to another page. I knew this topic has been raised before, but it was closed since may.

Can someone help me out? I have a deadline before end year holiday.

Url: https://www.alfacart.com/catalogresult/?q=air+mineral&cat=

Sitemap:
{"_id":"alfacart_data","startUrl":["https://www.alfacart.com/catalogresult/?q=air+mineral&cat="],"selectors":[{"id":"item","type":"SelectorElementClick","parentSelectors":["_root"],"selector":"div.item","multiple":true,"delay":"2000","clickElementSelector":"ul.pagination","clickType":"clickOnce","discardInitialElements":true,"clickElementUniquenessType":"uniqueText"},{"id":"title","type":"SelectorText","parentSelectors":["item"],"selector":"h4.group a.ga-click-search-result","multiple":false,"regex":"","delay":0},{"id":"price","type":"SelectorText","parentSelectors":["item"],"selector":"p.lead","multiple":false,"regex":"","delay":0},{"id":"image","type":"SelectorImage","parentSelectors":["item"],"selector":"img.group","multiple":false,"delay":0}]}