{% if U_PRIME_SUBJECT_CHECK_AJAX %}
  <div id="prime_subject_check_ajax_display" class="first:pt-0 pt-4" style="display:none;">
		<div class="error text-sm text-red-700" id="prime_subject_check_ajax_results"></div>
	</div>

	<script>
	function get_ajax()
	{
		try { return new XMLHttpRequest(); } catch (e) {}
		try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) {}
		try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {}
		return null;
	}

	// Emulate PHP's urlencode function
	function urlencode(s)
	{
		s = encodeURIComponent(s);
		s = s.replace('%20', '+');
		s = s.replace('*', '%2A');
		s = s.replace("!", '%21');
		s = s.replace("'", '%27');
		s = s.replace('(', '%28');
		s = s.replace(')', '%29');
		s = s.replace('~', '%7E');
		return s;
	}

	function urldecode(s)
	{
		//s = s.replace('+', '%20'); //php response has literal plus signs
		s = s.replace('%2A', '*');
		s = s.replace('%21', "!");
		s = s.replace('%27', "'");
		s = s.replace('%28', '(');
		s = s.replace('%29', ')');
		s = s.replace('%7E', '~');
		try {
			s = decodeURIComponent(s);
		} catch(e) {};
		return s;
	}

	function prime_subject_check(wait)
	{
		if (!(ajax = get_ajax()))
		{
			return true;
		}
		var subject	= postform.subject.value.replace(/^\s+|\s+$/g, '');
		if (subject == '' || subject == postform.subject_checked.value)
		{
			return (subject == '' || parseInt(postform.subject_check_bypass.value)) ? true : false;
		}
		var obj_r = document.getElementById('prime_subject_check_ajax_results');
		var obj_d = document.getElementById('prime_subject_check_ajax_display');
		obj_r.innerHTML = '{{ lang('SUBJECT_CHECK_WORKING') }}';
		obj_d.style.display = '';
		postform.subject_checked.value = subject;

		ajax.onreadystatechange = wait ? null : function() { if (ajax.readyState == 4) { prime_subject_check_response(obj_r, obj_d); } };
		ajax.open("GET", '{{ U_PRIME_SUBJECT_CHECK_AJAX }}' + '&subject=' + urlencode(subject), !wait);
		ajax.send(null);
		return (wait ? prime_subject_check_response(obj_r, obj_d) : false);
	}

	function prime_subject_check_response(obj_r, obj_d)
	{
		var topic_list = '';
		if (ajax.responseText)
		{
			topic_list = ajax.responseText;
			var s_str = '&subject=', s_pos = topic_list.lastIndexOf(s_str);
			var b_str = '&bypass=', b_pos = topic_list.lastIndexOf(b_str);
			if (s_pos >= 0 && b_pos > 0)
			{
				postform.subject_check_bypass.value = topic_list.substr(b_pos + b_str.length);
				topic_list = topic_list.substr(0, b_pos);
				postform.subject_checked.value = urldecode(topic_list.substr(s_pos + s_str.length));
				topic_list = topic_list.substr(0, s_pos);
			}
		}
		if (topic_list)
		{
			obj_r.innerHTML = topic_list;
			obj_d.style.display = '';
			return false;
		}
		obj_d.style.display = 'none';
		return true;
	}

	var ajax = null, postform = document.getElementById('postform') || document.getElementsByName('postform')[0];
	if (postform)
	{
		postform.onsubmit = function() {
			var result = prime_subject_check(true),
				msg = document.getElementById('prime_subject_check_ajax_results').innerHTML;

			if (!result && msg && (msg = msg.replace(/<br ?\/?>.*/i, "").replace(/(<([^>]+)>)/ig, "")))
			{
				alert(msg)
			}
			return result;
		}

		var subject_obj = document.getElementById('subject') || document.getElementsByName('subject')[0];
		if (subject_obj)
		{
			subject_obj.onblur = function() {
				prime_subject_check(false);
			}
		}
	}
	</script>
{% endif %}