One function to rule them all...

**OpenSSL** · Jul 23, 2008, 23:02

Trying to write a function that will enable/disable a drop down box of a corresponding checkbox. Rather than a function for each checkbox, I'd like to be able to just use 1 function to do it all.

I can't figure out how to pass the name of the corresponding dropdown to javascript though, so that I can disable/enable it after a corresponding checkbox is selected/deselected.. Here's my code:

HTML

Code:

<input type='checkbox' name='veggies' value='veggies' onchange="disableFormElement([This is what I need.. how to send the name 'veggies', or 'fruits', or whatever to the function dynamically)" /><select name="veggieType" disabled>
		<option>Choose One</option>
		<option value="corn">Corn</option>
		<option value="bean">Bean</option>
		</select>

Javascript

Code:

function disableFormElement(disableIt){
//if the drop down is disabled, the user has selected the corresponding checkbox, so enable it.
	if (document.pre.[This is what I need].disabled==true){
	document.pre.[This is what I need].disabled=false;
	} else //they have deselected the checkbox, to disable the dropdown.
	{
	document.pre.[This is what I need].disabled=true;
	}

Thanks!

**Raju Gautam** · Jul 23, 2008, 23:13

I am not sure how you have structured your checkbox and select box with different names, but if you are using (php), then the following example will help you out:

HTML Code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Untitled Document</title>
</head>
<script language="javascript" type="text/javascript">
function doCheck(chk, sel){
	if(chk.checked == true){
		sel.disabled = true;
	}
	else{
		sel.disabled = false;
	}
}
</script>
<body>
<form name="frm1" id="frm1" method="post" action="">
<table cellspacing="1" cellpadding="2" width="500">
<?php
for($i = 1; $i <= 10; $i++){
?>
<tr>
<td width="10&#37;">
<input type="checkbox" onClick="doCheck(this, this.form.sel_<?php echo $i;?>)" name="chk[]" id="chk_<?php echo $i;?>" value="<?php echo $i;?>" />
</td>
<td width="90%">
<select name="sel_<?php echo $i;?>" id="sel_<?php echo $i;?>">
	<option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
</select>
</td>
</tr>
<?php
}
?>
<tr>
<td colspan="2">
<input type="button" name="btn1" value="Add" onClick="doAddNew();">
</td>
</tr>
</table>
</form>
</body>
</html>

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