Help with checkboxes

sanfly · August 23, 2007

Hi all

I have a script (below) where different things should happen when checkboxes are selected

The first thing is that when you click on the "Band" option, a bunch of new options should appear. This works fine.

The second is that when you click on the "All Years" option, it should disable the other years. When I click on this I get an error:

document.maillist.bandYears.length is null or not an object

Now, I cant figure out why im getting this message. I was wondering if it was something to do with the fact that the bandYears[] checkbox array is put into the form using Javascript, rather than "hard coded"? Or is it something else? Can anyone help?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<script language="JavaScript">
	function getBandOptions(){
		if(document.maillist.u_group[4].checked == true){
			document.getElementById('bandYear').innerHTML = '<b>Year: </b><br></td><td><input type="checkbox" name="bandYears[]" value="all" style="vertical-align: middle;" onClick="disableYears();">  All years<br><input type="checkbox" name="bandYears[]" value="2007" style="vertical-align: middle;">  2007<br><input type="checkbox" name="bandYears[]" value="2006" style="vertical-align: middle;">  2006<br><input type="checkbox" name="bandYears[]" value="2005" style="vertical-align: middle;">  2005<br>';
			document.getElementById('bandCountry').innerHTML = '<b>Country: </b></td><td id="countrySelect">';  
			document.getElementById('bandRegion').innerHTML = '<b>Region: </b></td><td id="regionSelect"><select name="b_region" disabled><option value="SELECT REGION"></select>';

		}
		else{
			document.getElementById('bandYear').innerHTML = "";
			document.getElementById('bandCountry').innerHTML = "";
			document.getElementById('bandRegion').innerHTML = "";
		}			
	}

	function disableYears(){
		arrayLength = document.maillist.bandYears.length;
		if(document.maillist.bandYears[0].checked == true){
			for(i = 1; i < arrayLength; i++){
				document.maillist.bandYears[i].disabled = true;
			}
		}
		else{
			for(i = 1; i < arrayLength; i++){
				document.maillist.bandYears[i].disabled = false;
			}
		}
	}
</script>
</head>

<body>
<table align="center" class="mainTable" cellpadding="0" cellspacing="0" border="0">
<tr class="headingTr"><td valign="top"><OBJECT classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" WIDTH="440" HEIGHT="200" id="wbotb-map-2007" ALIGN=""><PARAM NAME=movie VALUE="images/wbotb-map-2007.swf"><PARAM NAME=quality VALUE=high><PARAM NAME=bgcolor VALUE=#FFFFFF><param name="wmode" value="transparent"><EMBED src="images/wbotb-map-2007.swf" quality=high bgcolor=#FFFFFF  WIDTH="440" HEIGHT="200" NAME="wbotb-map-2007" ALIGN="" TYPE="application/x-shockwave-flash" PLUGINSPAGE="http://www.macromedia.com/go/getflashplayer" wmode="transparent"></EMBED></OBJECT></td><td valign="top" align="right"><a href="index.php"><img src="images/2007-header-logo-only-black.jpg" width="340" height="200" border="0" title="WORLD BATTLE OF THE BANDS WEBSITE"></a></td></tr>
<tr class="navTr">
	<td colspan="2" valign="top">
		Menu goes here
	</td>
</tr>
<tr>
	<td colspan="2" class="mainContent" valign="top">	<title>WBOB Mailing List</title>
<div class="heading"><img src="images/h_send_group_email.png" alt="SEND GROUP EMAIL" width="235" height="30" border="0" title="SEND GROUP EMAIL"></div><br>
<form name="maillist" method="post" action="maillist.php?action=sendmail2">
	<table>
		<tr>
			<td valign="top" align="right" width="90"><b>User Group: </b></td>
				<td valign="top" width="180">
					<input type="checkbox" name="u_group[]" id="u_group" value="1" style="vertical-align: middle;">  Website Administrator<br>
					<input type="checkbox" name="u_group[]" id="u_group" value="2" style="vertical-align: middle;">  Administrator<br>
					<input type="checkbox" name="u_group[]" id="u_group" value="3" style="vertical-align: middle;">  Regional Coordinator<br>
					<input type="checkbox" name="u_group[]" id="u_group" value="12" style="vertical-align: middle;">  Photographer<br>
					<input type="checkbox" name="u_group[]" id="u_group" value="6" onclick="getBandOptions();" style="vertical-align: middle;">  Band<br>
				</td>
					<td valign="top">
						<br><br><br><br><br><br>
						<table cellspacing="5">

							<tr>
								<td valign="top" id="bandYear"></td>
								<td valign="top" id="bandCountry"></td>
								<td valign="top" id="bandRegion"></td>
							</tr>
						</table>							
					</td>
		</tr>
		<tr>

			<td colspan="3"><hr></td>
		</tr>

		<tr>
			<td colspan="3">
				<hr>
				<br>	
				<input type="button" onclick="history.back();return false;" value="« CANCEL">  
				<input type="submit" value="PREVIEW »">
			</td>

		</tr>

	</table>
</form>


	</td>
</tr>
<tr>
	<td class="mainFooter" colspan="2">
		<table cellspacing="0" cellpadding="0" width="100%" border="0">
			<tr>

				<td>
					<a href="contacts.php?action=list" class="footerNav">CONTACT US</a> :: <a href="sitemap.php" class="footerNav">SITE MAP</a>    All Content © 2007 World Battle of the Bands Ltd						
				</td>
				<td align="right">
					<a href="http://www.intergalacticrecords.com" target="_blank"><img src="images/igr_logo_60.gif" alt="" width="60" height="60" border="0" style="vertical-align: middle;" title="INTERGALACTIC RECORDS"></a>
					    

					<a href="http://www.sanfly.com" target="_blank"><img src="images/sanfly-mini-logo.gif" title="SANFLY WEB DESIGN" width="76" height="32" border="0" style="vertical-align: middle;"></a>
				</td>
			</tr>
		</table>

	</td>
</tr>
</table>
</body>
</html>

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