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Apply same ajax in many drop menus in one Form

Hi Experts,

I have a jsb page that has a table . This table are auto-generated according to the database records. For each row , I have ajax apply to its drop menu 1 and fill drop meun 2 and this ajax is applied to all table rows.

so, Can I pass the id of the drop menu (that I wish to fill) in ajax request to the Servlet . Then in my javaScript I get the id to fill the data on it?

for example,

var dropdown = document.getElementById("dropdown"+i);

and i should get it from the Servlet response ?
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1 Solution
could u explain me briefly
Of course you can. You can send any parameters to the request. It does not differ from any other request. Just the response differs.
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Sh_RashedAuthor Commented:
this is my form http://www.4img.com/ar/up/06/11/23/63a7769efbcc83107e5e385ccc6429de.jpg

all the rows int the form has index i from 0 to n (n = number of database records I retreive).

so When I select (in row number 0) ItemModel, the srial number will be displayed in the Serial Number drop box (in the same row 0).

But When I select (in row number 1) ItemModel, the serial number will be displayed in the serial Number drop box (in the row 0).

Because in the javaScript (that receive the response and fill the drop box ), will fill the dropbox that has id = "dropbox2". becuase it hard coded

as the following:

function writeSN(snXML){

var result = snXML;

array2 = result.split("#");

var dropdown = document.getElementById("dropdown2"); <------------- Here

dropdown.innerHTML = "";

for ( var I = 0 ; I < array2.length ; I++){

dropdown.options.add(new Option(array2[I],array2[I]));


I need to write the response in dropdown+i Where the i is the row number in the form ..

I hope that is clear explaination .. =)

any idea?
okay fine... when any one selects the ItemModel then in the corresponding row Itemserialnumber should be populated thats what  u r question

thats easy... when the user select any option in the Itemmodel dropdown box then it will trigger a javascript function which is used to send request to the server when calling the function pass this as a parameter, then in the function u will get the name of the dropdown box like this

for eg:
<select name="itemmodel1" onChange="sendrequest(this)"><option>xxxx</option></select>

function sendrequest(element) {
alert(element.name) //this returns the name of the item so in our eg it will return "itemname1"
//So using that u can get the index of the item, use substring to get the index using that index u can pointout the //corresponding itemserialnumber


Sh_RashedAuthor Commented:
in my example.. as I understood .. i did the following:

function getSN(itemModel) {

var e = itemModel.name; <--- do u mean this ?

var req = newXMLHttpRequest();

 req.onreadystatechange = getReadyStateHandler(req,writeSN);
 req.open("POST", "cart.do", true);
req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
req.send("e"=itemModel); <-- and send it


but it gives me alert message: undefined.
your problem is to identify which row select box the user selects??
Sh_RashedAuthor Commented:
then that was the solution....
in the above posted code what is itemModel send me the html code where u call this function
Sh_RashedAuthor Commented:
<%@page language="java" import="java.util.*,core.*"%>

        <meta http-equiv="Content-Language" content="en-us">
<script type="text/javascript" language="javascript" src="ajax1.js"></script>
<script type="text/javascript" language="javascript" src="cart.js"></script>

<script language="JavaScript" type="text/JavaScript">

function checkAll(checked){

    for (var i = 0; i<document.issuing.elements.length; i++) {
         if ((document.issuing.elements[i].type == "checkbox")) {
                 document.issuing.elements[i].checked = checked;



//String username = session.getAttribute("username");


        <form method="POST" action="action.do">
            <input name = "action" type="hidden" value="IssueToEmployee">
            <p>Issue to Employee belong to: <select size="1" name="orgnization">
            </select> <input type="submit" value="View" name="B1"></p>


            try {

                Vector result = new Vector();

                result = (Vector)request.getAttribute("result");

                Helper h = new Helper();

                Vector models = new Vector();

                if (result.isEmpty() ){



                else {

                    System.out.println(" result not empty");


      <form method="POST" name = "issuing"action="action.do">
      <table border="1" width="100%" id="table1">
                  <td>Employee Username</td>
                  <td>Item Model</td>
                  <td>Item Serial Number</td>
                  <td><input type="checkbox" name="chkallbox"  value="ON" onclick="checkAll(this.checked)"> </td>


                for (int i = 0; i <result.size();i++){

                            Request r = (Request)result.get(i);

                            models = h.getCatModel(r.getRequest());
                            int index = i +1;
                        <td><input name = "i<%= i %>" type = "hidden" value = "<%= i %>"><%=index%></td>
                        <td><input name = "username<%= i %>" type = "hidden" value = "<%= r.getUsername() %>"><%= r.getUsername()%></td>
                        <td><input name = "request<%= i %>" type = "hidden" value = "<%= r.getRequest() %>"><%= r.getRequest()%></td>
                        <td><select size="1" name = "ItemModel<%=i%>" onchange= "getSN(this.options[this.selectedIndex].value)" >
                            <option> Select Item Model </option>

    for (int c =0 ; c < models.size();c++){

                    Item ItemModel = (Item)models.get(c);
                    System.out.println("This is Item Model:"+ItemModel.getItemModel());

                         <option value ="<%= ItemModel.getItemModel() %>"><%= ItemModel.getItemModel() %></option>  

    }// end of for 2

                        <td><select size="1" name="ItemSNs<%=i %>" id = "dropdown<%= i %>"> </select></td>
                  <td><input type="checkbox" name="issue" value="ON"></td>

                }// end of 1 for
              <p><input type="submit" value="Submit" name="B1"><input type="reset" value="Reset" name="B2"></p>

                    }// end of else

            }// end of try

                catch (Exception e){

                    System.out.println("Exception in Issue To employee"+e.getMessage());

                }// end of catch



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