JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" name="wpuf_post_tags" id="new-post-tags" class="new-post-tags">

JavaScript

$('#new-post-tags').keypress(function(event){
	var keycode = (event.keyCode ? event.keyCode : event.which);
	if(keycode == '13'){
alert('hiiiii');
	}
});
$('#new-post-tags').click(function(){
    val = $(this).val();
    $(this).val(val + ',');
});