Solved

AJAX and

Posted on 2006-07-18
1
908 Views
Last Modified: 2009-07-29
Hello AJAX Expert,

I am trying to implement the Select/Dropdown AJAX tag from the following link.  The Select/Dropdown tag work the following way: when selection within a dropdown field, a second select field will be populated.

See the following link: http://ajaxtags.no-ip.info/

The demo has 2 files associated with it, a JSP and a JAVA servlet.  The servlet name is DropdownServlet.  How is this servlet called from the JSP with the following ajax:select tag?

<ajax:select
  baseUrl="${contextPath}/dropdown.view"
  source="make"
  target="model"
  parameters="make={make}"
  preFunction="initProgress"
  postFunction="resetProgress"
  errorFunction="reportError"
  parser="new ResponseXmlParser()" />

I am using Netbeans IDE with JSP named dropdown and servlet named DropdownServlet.   I think DropdownServlet is supposed to return model given make to the JSP to be displayed in the chained dropdown box.

Heres a code snippet from the demo JSP:

<form action="." class="basicForm">
  <fieldset>
    <legend>Choose Your Car</legend>
    <label for="make">Make:</label>
    <select id="make">
      <option value="">Select make</option>
      <option value="Ford">Ford</option>
      <option value="Honda">Honda</option>
      <option value="Mazda">Mazda</option>
    </select>
    <span id="progressMsg" style="display:none;"><img alt="Indicator" src="./styles/indicator.gif" /> Loading...</span>

    <label for="model">Model:</label>
    <select id="model" disabled="disabled">
      <option value="">Select model</option>
    </select>
  </fieldset>
</form>
<div id="errorMsg" style="display:none;border:1px solid #e00;background-color:#fee;padding:2px;margin-top:8px;width:300px;font:normal 12px Arial;color:#900"></div>

<script type="text/javascript">
 /*
  * USER DEFINED FUNCTIONS
  */

function initProgress() {
  Element.show('progressMsg');
}

function resetProgress() {
  // show marker emblem
  var index = $('make').selectedIndex;
  var automaker = $('make').options[index].text;
  var imgTag = $('makerEmblem');
  if (index > 0) {
    imgTag.src = "./styles/" + automaker.toLowerCase() + "_logo.gif";
  }

  Effect.Fade('progressMsg');
}

function reportError() {
  if ($('model').options.length == 0) {
    $('errorMsg').innerHTML = "Dropdown busted!";
  }
  Element.show('errorMsg');
  setTimeout("Effect.DropOut('errorMsg')", 2500);
}
</script>

<ajax:select
  baseUrl="${pageContext.request.contextPath}/DropdownServlet"
  source="make"
  target="model"
  parameters="make={make}"
  preFunction="initProgress"
  postFunction="resetProgress"
  errorFunction="reportError"
  parser="new ResponseXmlParser()" />

Can you tell be how the servlet gets called in this AJAX demo?

Getting desperate.  Appreciate the help!!
0
Comment
Question by:i808237
1 Comment
 
LVL 3

Accepted Solution

by:
anumalas earned 500 total points
ID: 17182642
Hi

by default ajax:select will call cjajax.js java script. all the servlet communication functionality is written in that java script to communicate with the java sources like servlet or action classes

i suggest you to go thru that java script file

please refer the link, download cjajax.js and go thru

http://www.servletsuite.com/servlets/ajaxseltag.htm

Hope this will solve your confusion :)
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
java cyclic graphs 15 219
AlarmClock Challenge 35 155
main method of string class 3 122
going to wrong jsp page 2 46
Arrow Electronics was searching for a KVM  (Keyboard/Video/Mouse) switch that could display on one single monitor the current status of all units being tested on the rack.
The Windows functions GetTickCount and timeGetTime retrieve the number of milliseconds since the system was started. However, the value is stored in a DWORD, which means that it wraps around to zero every 49.7 days. This article shows how to solve t…
Attackers love to prey on accounts that have privileges. Reducing privileged accounts and protecting privileged accounts therefore is paramount. Users, groups, and service accounts need to be protected to help protect the entire Active Directory …

685 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question