diff --git a/htdocs/core/class/extrafields.class.php b/htdocs/core/class/extrafields.class.php
index 56b243cd7ec..fe6b7474642 100644
--- a/htdocs/core/class/extrafields.class.php
+++ b/htdocs/core/class/extrafields.class.php
@@ -673,7 +673,7 @@ class ExtraFields
 		elseif ($type == 'select')
 		{
 			$out = '';
-			if ($conf->use_javascript_ajax && $conf->global->COMPANY_USE_SEARCH_TO_SELECT && ! $forcecombo)
+			if (! empty($conf->use_javascript_ajax) && ! empty($conf->global->COMPANY_USE_SEARCH_TO_SELECT) && ! $forcecombo)
 			{
 				include_once DOL_DOCUMENT_ROOT . '/core/lib/ajax.lib.php';
 				$out.= ajax_combobox('options_'.$key.$keyprefix, array(), $conf->global->COMPANY_USE_SEARCH_TO_SELECT);
diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index 8cb0a344e43..ebe0f143a93 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -804,7 +804,7 @@ class Form
         $resql=$this->db->query($sql);
         if ($resql)
         {
-            if ($conf->use_javascript_ajax && $conf->global->COMPANY_USE_SEARCH_TO_SELECT && ! $forcecombo)
+            if (! empty($conf->use_javascript_ajax) && ! empty($conf->global->COMPANY_USE_SEARCH_TO_SELECT) && ! $forcecombo)
             {
 				include_once DOL_DOCUMENT_ROOT . '/core/lib/ajax.lib.php';
             	$out.= ajax_combobox($htmlname, $events, $conf->global->COMPANY_USE_SEARCH_TO_SELECT);
@@ -1008,6 +1008,7 @@ class Form
 
             if ($conf->use_javascript_ajax && $conf->global->CONTACT_USE_SEARCH_TO_SELECT && ! $forcecombo && ! $options_only)
             {
+				include_once DOL_DOCUMENT_ROOT . '/core/lib/ajax.lib.php';
             	$out.= ajax_combobox($htmlname, $events, $conf->global->CONTACT_USE_SEARCH_TO_SELECT);
             }
 
diff --git a/htdocs/core/lib/agenda.lib.php b/htdocs/core/lib/agenda.lib.php
index 8ea437dab54..048561b34e5 100644
--- a/htdocs/core/lib/agenda.lib.php
+++ b/htdocs/core/lib/agenda.lib.php
@@ -77,11 +77,18 @@ function print_actions_filter($form, $canedit, $status, $year, $month, $day, $sh
 		print '</td><td class="nowrap maxwidthonsmartphone">';
 		//print ' &nbsp;';
 		print $form->select_dolusers($filtert, 'usertodo', 1, '', ! $canedit);
-		print ajax_combobox('usertodo');
+		if (! empty($conf->use_javascript_ajax))
+		{
+			include_once DOL_DOCUMENT_ROOT . '/core/lib/ajax.lib.php';
+			print ajax_combobox('usertodo');
+		}
 		print ' &nbsp; '.$langs->trans("or") . ' ';
 		print $langs->trans("ActionsForUsersGroup").' &nbsp; ';
 		print $form->select_dolgroups($usergroupid, 'usergroup', 1, '', ! $canedit);
-		print ajax_combobox('usergroup');
+		if (! empty($conf->use_javascript_ajax))
+		{
+			print ajax_combobox('usergroup');
+		}
 		print '</td></tr>';
 
 		/*print '<tr>';
diff --git a/htdocs/resource/class/html.formresource.class.php b/htdocs/resource/class/html.formresource.class.php
index f618581aecd..241d440cc0f 100644
--- a/htdocs/resource/class/html.formresource.class.php
+++ b/htdocs/resource/class/html.formresource.class.php
@@ -88,7 +88,7 @@ class FormResource
 
     	if ($resourcestat)
     	{
-    		if ($conf->use_javascript_ajax && $conf->global->COMPANY_USE_SEARCH_TO_SELECT && ! $forcecombo)
+    		if (! empty($conf->use_javascript_ajax) && ! empty($conf->global->COMPANY_USE_SEARCH_TO_SELECT) && ! $forcecombo)
     		{
     			//$minLength = (is_numeric($conf->global->COMPANY_USE_SEARCH_TO_SELECT)?$conf->global->COMPANY_USE_SEARCH_TO_SELECT:2);
     			$out.= ajax_combobox($htmlname, $event, $conf->global->COMPANY_USE_SEARCH_TO_SELECT);