diff --git a/htdocs/core/class/html.formcompany.class.php b/htdocs/core/class/html.formcompany.class.php
index e91184ede12..40276b6205d 100644
--- a/htdocs/core/class/html.formcompany.class.php
+++ b/htdocs/core/class/html.formcompany.class.php
@@ -564,16 +564,21 @@ class FormCompany
 				}
 			}
 
-			// Refresh contacts list on thirdparty list change
-			$htmloption='';
 
 			$events=array();
+			// Add an entry 'method' to say 'yes, we must execute url with param action = method';
+			// Add an entry 'url' to say which url to execute
+			// Add an entry htmlname to say which element we must change once url is called 
+			// Add entry params => array('cssid' => 'attr') to say to remov or add attribute attr if answer of url return  0 or >0 lines 
+			// To refresh contacts list on thirdparty list change
 			$events[]=array('method' => 'getContacts', 'url' => dol_buildpath('/core/ajax/contacts.php',1), 'htmlname' => 'contactid', 'params' => array('add-customer-contact' => 'disabled'));
+			
 			if (count($events))	// If there is some ajax events to run once selection is done, we add code here to run events
 			{
 				print '<script type="text/javascript">
 				jQuery(document).ready(function() {
 					$("#search_'.$htmlname.'").change(function() {
+					    console.log("Call runJsCodeForEvent'.$htmlname.'");
 						var obj = '.json_encode($events).';
 						$.each(obj, function(key,values) {
 							if (values.method.length) {
@@ -583,7 +588,7 @@ class FormCompany
 						/* Clean contact */
 						$("div#s2id_contactid>a>span").html(\'\');
 					});
-
+								    
 					// Function used to execute events when search_htmlname change
 					function runJsCodeForEvent'.$htmlname.'(obj) {
 						var id = $("#'.$htmlname.'").val();
@@ -609,6 +614,7 @@ class FormCompany
 											}
 										}
 									});
+						            /* console.log("Change select#"+htmlname+" with content "+response.value) */
 									$("select#" + htmlname).html(response.value);
 								}
 							}
@@ -619,8 +625,8 @@ class FormCompany
 			}
 
 			print "\n".'<!-- Input text for third party with Ajax.Autocompleter (selectCompaniesForNewContact) -->'."\n";
-			print '<input type="text" size="30" id="search_'.$htmlname.'" name="search_'.$htmlname.'" value="'.$name.'" '.$htmloption.' />';
-			print ajax_autocompleter(($socid?$socid:-1),$htmlname,DOL_URL_ROOT.'/societe/ajaxcompanies.php','',$minLength);
+			print '<input type="text" size="30" id="search_'.$htmlname.'" name="search_'.$htmlname.'" value="'.$name.'" />';
+			print ajax_autocompleter(($socid?$socid:-1), $htmlname, DOL_URL_ROOT.'/societe/ajaxcompanies.php', '', $minLength, 0);
 			return $socid;
 		}
 		else
diff --git a/htdocs/core/lib/ajax.lib.php b/htdocs/core/lib/ajax.lib.php
index fa150e6fbb7..4b3ab3b32f4 100644
--- a/htdocs/core/lib/ajax.lib.php
+++ b/htdocs/core/lib/ajax.lib.php
@@ -35,29 +35,40 @@
  *  @param	string	$urloption			More parameters on URL request
  *  @param	int		$minLength			Minimum number of chars to trigger that Ajax search
  *  @param	int		$autoselect			Automatic selection if just one value
- *  @param	array	$ajaxoptions		Multiple options array (Ex: array('update'=>array('field1','field2'...)) will reset field1 and field2 once select done)
+ *  @param	array	$ajaxoptions		Multiple options array 
+ *                                          Ex: array('update'=>array('field1','field2'...)) will reset field1 and field2 once select done
+ *                                          Ex: array('disabled'=>
+ *                                          Ex: array('show'=>
+ *                                          Ex: array('update_textarea'=>
  *	@return string              		Script
  */
 function ajax_autocompleter($selected, $htmlname, $url, $urloption='', $minLength=2, $autoselect=0, $ajaxoptions=array())
 {
     if (empty($minLength)) $minLength=1;
 
+    // Input search_htmlname is original field
+    // Input htmlname is a second input field used when using ajax autocomplete.
 	$script = '<input type="hidden" name="'.$htmlname.'" id="'.$htmlname.'" value="'.$selected.'" />';
 
-	$script.= '<script type="text/javascript">';
+	$script.= '<!-- Javascript code for autocomplete of field '.$htmlname.' -->'."\n";
+	$script.= '<script type="text/javascript">'."\n";
 	$script.= '$(document).ready(function() {
 					var autoselect = '.$autoselect.';
 					var options = '.json_encode($ajaxoptions).';
 
-					// Remove product id before select another product
-					// use keyup instead change to avoid loosing the product id
+					/* Remove product id before select another product use keyup instead of change to avoid loosing the product id. This is needed only for select of predefined product */
+					/* TODO Check if we can remove this */
 					$("input#search_'.$htmlname.'").keydown(function() {
 						$("#'.$htmlname.'").val("");
 					});
-					$("input#search_'.$htmlname.'").change(function() {
+						    
+					/* I disable this. A call to trigger is already done later into the select action of the autocomplete code 
+						$("input#search_'.$htmlname.'").change(function() {
+					    console.log("Call the change trigger on input '.$htmlname.' because of a change on search_'.$htmlname.' was triggered");
 						$("#'.$htmlname.'").trigger("change");
-					});
-					// Check when keyup
+					});*/
+
+					// Check options for secondary actions when keyup
 					$("input#search_'.$htmlname.'").keyup(function() {
 						    if ($(this).val().length == 0)
 						    {
@@ -123,8 +134,9 @@ function ajax_autocompleter($selected, $htmlname, $url, $urloption='', $minLengt
 						},
 						dataType: "json",
     					minLength: '.$minLength.',
-    					select: function( event, ui ) {		// Function ran when new value is selected into javascript combo
-    						$("#'.$htmlname.'").val(ui.item.id).trigger("change");	// Select new value
+    					select: function( event, ui ) {		// Function ran once new value has been selected into javascript combo
+    						console.log("Call change on input '.$htmlname.' because of select definition of autocomplete select call on input#search_'.$htmlname.'");
+    					    $("#'.$htmlname.'").val(ui.item.id).trigger("change");	// Select new value
     						// Disable an element
     						if (options.option_disabled) {
     							if (ui.item.disabled) {
@@ -167,6 +179,8 @@ function ajax_autocompleter($selected, $htmlname, $url, $urloption='', $minLengt
 									}
     							});
     						}
+    						console.log("ajax_autocompleter new value selected, we trigger change on original component");
+    						$("#search_'.$htmlname.'").trigger("change");	// We have changed value of the combo select, we must be sure to trigger all js hook binded on this event. This is required to trigger other javascript change method binded on original field by other code.
     					}
     					,delay: 500
 					}).data("ui-autocomplete")._renderItem = function( ul, item ) {