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Checking if node exists before accessing data

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Checking if node exists before accessing data

Checking if node exists before accessing data

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

CODE

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.

RE: Checking if node exists before accessing data

(OP)
someone has suggested this

CODE

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

RE: Checking if node exists before accessing data

This is a quick fix.

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

RE: Checking if node exists before accessing data

(OP)
thanks tsuji :)

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