How can I use Ajax function in Craft CMS? I want to do an autocomplete search engine on my website. But I don't know how to use Ajax in Craft CMS. How can I set an Ajax function in Craft CMS templating? The search engine must have dynamic auto-complete feature according to title and content.
Since Craft makes no assumptions about the front-end content of your website, it's 100% up to you on how you want to implement AJAX functionality on your site.  So it wouldn't be any different if you were trying to use AJAX on a simple static page with no CMS managing the content.

For example, a popular method is to use jQuery's ajax method.