[Javascript] liste déroulante onChange

function submitChange ( ){
    // --- Modification du parametre action qui va permettre d'appeller la bonne méthode JAVA a éxécuter.
    document.forms[0].action.value = 'change';
    // --- Soumission du formulaire.
    document.forms[0].submit;
}

   onchange="javascript:submitChange()" 

  onclick='javascript:submitChange(this)"

function submitChange ( liste ){
    // --- Recup de la valeur courante :
     var val = liste.options[liste.selectedIndex].value;
    // --- Ensuite libre à toi d'aller chercher le 
    // --- texte correspondant à la valeur :
    var texte = ...
    // --- Puis de remplir la zone ou afficher le texte comme il se doit.
    // --- Admettons pour cela que dans ta JSP tu aie déclarée une DIV
    // --- ayant id='toto'
    document.getElementById('toto').innerHTML = texte;
}

<?php
include "script.js";
?>

<select name="choix" onchange="setNewDate(this)">
<option value="1">Une heure avant</option>
<option value="6">6 heures avant</option>
<option value="0">Aujourd'hui</option>
<option value="24">Les dernieres 24 heures</option>
</select>
</td>
<td>
De:
<input id="from" type="Text" name="input12" value= "">
</td>
<td>
jusqu'a:
<input id="to" type="Text" name="input13" value= "">
</td> 

<script language="javascript">
// --- Insert current date into 'to' input
insertCurrentDate();
// --- Launch timer
startTimer();
</script>

<script language="javascript">

var currentDate = new Date();

/**
 * Calculate new time in function of time parameter
 */
function calculateNewTime ( _additional_time_in_hours ){
	
	// --- Check if input text "from" is present
	if ( ! document.getElementById("from") ){
		alert("Missing form data 'from' to calculate the new date");
		return;
	}
	// --- Check if input text "to" is present
	var toTime = null;
	if ( ! document.getElementById("to") ){
		alert("Missing form data 'to' to calculate the new date");
		return;
	}
	// --- Retrieve 'to' value
	else
		toTime = document.getElementById("to").value;
	
	// --- Calculate the new date only if input text "to" is filled
	if ( toTime != null && toTime != "" ){
		
		// --- Take current time as a reference to calculate the new time.
		// --- An update would be to parse the value of the input text 'to' in order the user to be able to enter his own time
		// --- instead of having current time forced
		var newDate = new Date(currentDate.getTime());
		// --- Del additional time
		newDate.setHours(newDate.getHours()-_additional_time_in_hours);
		document.getElementById("from").value = 
			newDate.getFullYear()+"-"+(newDate.getMonth()+1)+"-"+newDate.getDate()+" "+
			newDate.getHours()+":"+newDate.getMinutes()+":"+newDate.getSeconds();
		
	}
	
}

function setNewDate ( selectBox ){
	calculateNewTime(selectBox.options[selectBox.options.selectedIndex].value);
}

/**
 * Insert current timestamp into input text "to"
 */
function insertCurrentDate ( ){
	if ( document.getElementById("to") )
		document.getElementById("to").value = 
			currentDate.getFullYear()+"-"+(currentDate.getMonth()+1)+"-"+currentDate.getDate()+" "+
			currentDate.getHours()+":"+currentDate.getMinutes()+":"+currentDate.getSeconds();
}

/**
 * Timer to set automatically the current date into the input text 'to'
 * and have the real date recalculated
 */
var tant = 0;  // ---
function startTimer(){
   tant = tant+1;

   if (tant < 60 ) {  // exemple:caler à 60 secondes (60*1000) 
      timerID = setTimeout("startTimer()",1000);
   } else {
      tant = 0;
      // --- New date
      currentDate = new Date();
      // --- Display again
      insertCurrentDate();     
      startTimer();                                // Redémarre la boucle
   }
}

</script>

La seule modif est l'ajout de la fonction 'startTimer' qui toutes les 60 secondes (modifiable), modifie la date courante et raffraichit le champ input 'to' avec cette nouvelle date.