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04/07/2009 at 07:41AM PDT, ID: 24302164
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8.4

Javascript to add options to a select tag

Asked by that_it_guy in Miscellaneous Web Development, JavaScript, Asynchronous Javascript and XML (AJAX)

Tags: javascript, web development, dynamic loading options

I have a page with 2 drop down boxes on it. The second one is filled with options after a selection in the first one is made. That part is working. It will be changed to read items from a database instead of static test options, but that's not a problem. What I need to know is how do you set the value attribute of an option tag being added through javascript? If you look at the attached code, you can see the options are loaded from xml that is sent to the page. The xml elements I am loading (for this test) are named < employee > and have an id attribute. I want that id attribute set as the value of the option when loading the dropdown, so the employee name is the text you select and the employee ID is what is submitted with the form. I tried setting o.value before the mySelect.add line, but that was submitting undefined for the select. Not sure how to do this. Thanks for the help! 
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index.html contains:
 
<html>
<head>
  <script language="javascript">
    var xhttp;
 
    function onSelectionChange(){
      var mySelect = document.forms[0].portfolio;
      if (mySelect.selectedIndex>-1){
        //instantiate XmlHttpRequest
 
          // Checking if IE-specific document.all collection exists 
          // to see if we are running in IE 
          if (document.all) { 
            xhttp = new ActiveXObject("Msxml2.XMLHTTP"); 
           } else { 
          // Mozilla - based browser 
            xhttp = new XMLHttpRequest(); 
          }
          //hook the event handler
          xhttp.onreadystatechange = HandlerOnReadyStateChange;
          //prepare the call, http method=GET, true=asynchronous call
          xhttp.open("GET", 
            "http://localhost/category_test/getcats.aspx?portfolio=" + 
            mySelect.selectedIndex, true);
          //finally send the call
          xhttp.send();          
        }
      }
      function HandlerOnReadyStateChange(){
        var mySelect = document.forms[0].analyst;
        
        // This handler is called 4 times for each 
        // state change of xmlhttp
        // States are: 0 uninitialized
        //      1 loading
        //      2 loaded
        //      3 interactive
        //      4 complete
        if (xhttp.readyState==4){
          mySelect.innerHTML = "";
          
          //responseXML contains an XMLDOM object
          var nodes = xhttp.responseXML.selectNodes("//employee");
          for (var i=0; i<nodes.length; i++){
            var o = new Option();
              o.text = nodes(i).text;
            mySelect.add(o);
          }
        }
      }
    </script>
  </head>
  <body>
    <form id="form1" name="form1" action="showresults.aspx">
      <table>
        <tr>
          <td>Portfolio size:</td>
          <td>
            <select id="portfolio" name="portfolio" 
             onchange="onSelectionChange();">
              <option></option>
              <option>0 .. 10,000</option>
              <option>10,000 to 100,000</option>
              <option>Over 100,000</option>
            </select>
          </td>
        </tr>
        <tr>
          <td>Authorized financial analyst:</td>
          <td>
            <select id="analyst" name="analyst"> 
            </select>
          </td>
        </tr>
        <tr>
          <td>Comments</td>
          <td>
            <textarea name="comments" rows="3" cols="20"
              ID=Textarea1></textarea>
          </td>
        </tr>
      </table>
      <input type=submit>
    </form>
  </body>
</html>
 
getcats.aspx contains only:
 
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="getcats.aspx.vb" Inherits="HTUSearch.getcats" %>
 
getcats.aspx.vb contains:
 
Imports System.IO
Imports System.Xml
 
Partial Public Class getcats
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim xmlWriter As XmlTextWriter
 
        Response.Clear()
        Response.ContentEncoding = Encoding.UTF8
        Response.ContentType = "text/xml"
 
        Using tw As TextWriter = New StreamWriter(Response.OutputStream, Encoding.UTF8)
            xmlWriter = New XmlTextWriter(tw)
            xmlWriter.WriteStartDocument()
            xmlWriter.WriteStartElement("employees", "employees", "")
            xmlWriter.WriteStartElement("employee", "employee", "")
            xmlWriter.WriteAttributeString("id", "", "1")
            xmlWriter.WriteValue("Test 1")
            xmlWriter.WriteEndElement()
            xmlWriter.WriteStartElement("employee", "employee", "")
            xmlWriter.WriteAttributeString("id", "", "2")
            xmlWriter.WriteValue("Test 2")
            xmlWriter.WriteEndElement()
            xmlWriter.WriteEndElement()
            xmlWriter.WriteEndDocument()
        End Using
 
        xmlWriter.Close()
 
    End Sub
 
End Class
[+][-]04/07/09 07:53 AM, ID: 24087949

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About this solution

Zones: Miscellaneous Web Development, JavaScript, Asynchronous Javascript and XML (AJAX)
Tags: javascript, web development, dynamic loading options
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Solution Provided By: AlvinLim84
Participating Experts: 1
Solution Grade: B
 
 
[+][-]04/07/09 07:57 AM, ID: 24087998

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[+][-]04/07/09 08:17 AM, ID: 24088229

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

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