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How do I compare a listbox value using JavaScript getElementsByName

I want to compare a value from a form that uses radio buttons for a list box. I am using getElementsByName in my javascript with success for checked boxes and text boxes however I am not having success with list box.
The checked box code looks like
if(document.getElementsByName('SDvcs')[0].checked && document.getElementsByName('SDfprv')[0].checked)

text uses .value and I can't seem to find what to use for list box.

nivlam

Could you post the code for the form?

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LordOfPorts

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wendell01

ASKER

I use PHP, HTML form, and MYSQL to process data for a form.

The php functions for insert or update use php below for the data fields we are trying to check.
      // combobox: SDvcs
      $combo_SDvcs = new Combo;
      $combo_SDvcs->ListType = 2;
      $combo_SDvcs->ListBoxHeight = 10;
      $combo_SDvcs->RadiosPerLine = 1;
      $combo_SDvcs->ListItem = explode(";;", "N;;Y");
      $combo_SDvcs->ListData = explode(";;", "N;;Y");
      $combo_SDvcs->SelectName = "SDvcs";
      // combobox: SDfprv
      $combo_SDfprv = new Combo;
      $combo_SDfprv->ListType = 2;
      $combo_SDfprv->ListBoxHeight = 10;
      $combo_SDfprv->RadiosPerLine = 1;
      $combo_SDfprv->ListItem = explode(";;", "N;;Y");
      $combo_SDfprv->ListData = explode(";;", "N;;Y");
      $combo_SDfprv->SelectName = "SDfprv";
The code on the form itself looks like:
                          <td colspan="2" valign=top class=TableBlueHeader>                         <div align="center"><span class="style1"><strong>Validated by carton standards
              <br>
              <%%COMBO(SDvcs)%%>
                   </strong> </span></div></td>
                          <td width="120" valign=top class=TableBlueHeader><div align="center"><span class="style1"><strong>Reference Number:</strong></span>
              <br>
<td colspan="7" valign=top class=TableBlueHeader>                    <div align="center"><span class="style1"><strong>First Press run validation
              <br>
              <%%COMBO(SDfprv)%%>
                   </strong></span></div></td>

I use a function called SDform_validate to process the data fields.

wendell01

ASKER

I actually ended up with a simple if statement. The key was realizing I needed to look at the proper index to test for the value to be checked.
if(document.getElementsByName('SDvcs')[2].checked && document.getElementsByName('SDfprv')[2].checked)

wendell01

ASKER

I ended up using the following if statement

if(document.getElementsByName('SDvcs')[2].checked && document.getElementsByName('SDfprv')[2].checked)