Get post_id on clicking a link in WordPress

the another way to get the post_id by clicking on the link is to add a data-attribute to the link. e.g; data-post-id="'.get_the_ID().'"

your html code should look like

<a href="#link" data-post-id="47">Link</a>

then in your js code above the ajax call

var post_id = jQuery(this).attr('data-post-id');

and pass this in your data object to the ajax call.

data: ({
     action: "get_prev_ajax_handler",
     url: url,
     post_id: post_id,
}),

now you can get the post_id with $_POST['post_id'] or print_r() the $_POST array()