Checking if node exists before accessing data

[kneeboarder]

If I'm looping through the xml and using getElementsByTagName -

x[i].getElementsByTagName("fieldname")[0].childNodes[0].nodeValue

is there a way of checking whether that node exists?

This errors if the field is empty or the field doesn't exist at all so I want to test first before trying to get the actual value.

 

[kneeboarder]

someone has suggested this

var el = x[i].getElementsByTagName("fieldname")[0];
if (el.childNodes && el.childNodes.length > 0) {
   // access the nodeValue
}
else {
   // don't
}

 

[tsuji]

This is a quick fix.
[tt]
var el = x.getElementsByTagName("fieldname"[highlight]);[/highlight]
if (el[red][0][/red] && el[0].childNodes[0]) {
// access the nodeValue (el[0].childNodes[0].nodeValue
}
else {
// don't
}[/tt]

 

[kneeboarder]

thanks tsuji