Dynamically Adding Posts of Post Type to A List

When I’ve investigated your example page, they sent an ajax like process to server and server return with a js code for the header (I’ve added below). Also, you can use Javascript & LocalStorage functionality for this situation.

response from their server

$('.domain-session-collection-count').html('1\n').fadeIn().show();
$("#collection_manager").html('<a class=\"btn btn-success pt-1 pb-1 border mb-1 btn-block f-s-15\" data-remote=\"true\" href=\"/my_speaker_list/remove_speaker/17093\">Added To List<\/a>\n');

$('#collection-action-17093').html('  <a data-remote=\"true\" href=\"/my_speaker_list/remove_speaker/17093\">\n    <button class=\"full-width remove\">\n      <i class=\"fa fa-check\"><\/i>\n    <\/button>\n<\/a>').fadeIn().show();
$(".speaker-add-remove").html("<a class=\"btn btn-success pt-1 pb-1 border mb-1 btn-block f-s-15\" data-remote=\"true\" href=\"/my_speaker_list/remove_speaker/17093\">Added To List<\/a>\n");
$("#speaker-add-remove-nav").html("  <a class=\" pt-1 pb-1 text-success pl-2 pr-2 text-center\" style=\"width: 110px;\" data-remote=\"true\" href=\"/my_speaker_list/remove_speaker/17093\">Added to List<\/a>\n");

When visitor/customer click your button, you can add CPT post id into a LocalStorage value, If they click one more people you can update LocalStorage value. After that, you can easily read this value and you can get info via WordPress Ajax with these ids. Also, you can create hidden input to your form with these ids.

This operation can easily be done with basic Javascript and above average WordPress Ajax knowledge.

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