Get all values from multi select in a servlet

Hello,
I have a multi <select> element in a HTML form and I need to retrieve the values of ALL selected options of this <select> element in a servlet.
HTML code snippet
<select name="elName" id="elName" multiple="multiple">
Servlet code snippet
response.setContentType("text/html");
PrintWriter out = null;
out = response.getWriter();
String output = "";
String[] str = request.getParameterValues("elName");
for(String s : str) {
output += s + ":";
output = output.substring(0, output.length()-1); // cut off last deliminator
out.println(output);But even when selecting multiple options, the returned text only ever contains the value of the first selected option in the <select>
What am I doing wrong? I'm fairly new to servlets
Edited by: Irish_Fred on Feb 4, 2010 12:43 PM
Edited by: Irish_Fred on Feb 4, 2010 12:44 PM
Edited by: Irish_Fred on Feb 4, 2010 2:14 PM
Edited by: Irish_Fred on Feb 4, 2010 2:26 PM
Edited by: Irish_Fred on Feb 4, 2010 2:26 PM
Edited by: Irish_Fred on Feb 4, 2010 2:32 PM

I am using AJAX.
I will show you how I'm submitting the <select> values by showing you the flow of code:
This is the HTML code for the <select> tag and the button that sends the form data:
<form name="formMain" id="formMain" method="POST">
     <input type="button" id="addOpts" name="addOpts" value="Add Options" style="width:auto; visibility:hidden" onClick="jsObj.addOptions('servletName', document.getElementById('elName'))">
     <br>
     <select name="elName" id="elName" multiple="multiple" size="1" onChange="jsObj.checkSelected()">
          <option value="0"> - - - - - - - - - - - - - - - - </option>
     </select>
</form>Note that the "visibility:hidden" part of the button style is set to "visible" when at least one option is selected
Note that "jsObj" relates to a java script object that has been created when the web app starts ( The .js file is included in the .jsp <head> tag )
The following code is taken from the file: "jsObj.js"
jsObj = new jsObj();
function jsObj() {
//=================================================
     this.addOptions = function(url, elName) {
          var theForm = document.getElementById('formMain');
          if (window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari
               xmlhttp=new XMLHttpRequest();
          } else { // code for IE6, IE5
               xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
          url += this.buildQueryString(theForm.name);
          xmlhttp.open("POST",url,true);
          xmlhttp.send(null);
          xmlhttp.onreadystatechange=function() {
               if(xmlhttp.readyState==4) { // 4 = The request is complete
                    alert(xmlhttp.responseText);
//=================================================
this.buildQueryString = function(formName) {
          var theForm = document.forms[formName];
          var qs = '';
          for (var i=0; i<theForm.elements.length; i++) {
               if (theForm.elements.name!='') {
                    qs+=(qs=='')? '?' : '&';
                    qs+=theForm.elements[i].name+'='+escape(theForm.elements[i].value);
          return qs;
     //=================================================
}And this is a code snippet from the "servletName" servlet:public synchronized void doGet(HttpServletRequest request,
          HttpServletResponse response) throws ServletException,IOException {
          PrintWriter out = null;
          try {
               response.setContentType("text/html");
               out = response.getWriter();
               String output = "";
               String[] values = request.getParameterValues("elName");
               for(String s : values) {
                    output += s + ":";
               output = output.substring(0, output.length()-1); // cut off last delimitor
               out.println(output);
               } catch (Exception e) {
     }So anyway, everthing compiles / works, except for the fact that I'm only getting back the first selected <option> in the 'elName' <select> tag whenever I select multiple options
Edited by: Irish_Fred on Feb 7, 2010 10:53 AM

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