firstchild has no properties - xml - firefox

[Noddy]

I am trying to parse some XML in Javascript on firefox. I get the error ‘firstchild has no properties’.

The XML looks like this: -

- <AddressSearc h>
- <Summary>
<Total>30</Total>
<Pages>1</Pages>
<Page>1</Page>
<PageLength>200 </PageLength>
- <Range>
<Start>1</Start>
<End>30</End>
</Range>
- <InputValues>
<PostCode>sk1 4 6ld</PostCode>
</InputValues>
</Summary>
- <Address>
<PrimaryName />
<PrimaryNumber> 12A</PrimaryNumber>
<UPRN>100011577 044</UPRN>
<DESCRIPTION>MO TTRAM MOOR</DESCRIPTION>
<LOC />
<TOWN>MOTTRAM </TOWN>
<POSTTOWN>HYD E</POSTTOWN>
<POSTCODE>SK1 4 6LD</POSTCODE>
<X>399595</X>
<Y>395775</Y>
</Address>

My code is :-

AddressElements = rootNode.childN odes.item(1);

if (browsername == "Firefox") {
Northing = AddressElements .childNodes.ite m(en).firstChil d.nodeValue;
} else {
Northing = AddressElements .childNodes.ite m(en).text;
}

This works ok until the code hits the XML line <PrimaryName />

If I check for the nodename equal to fields that are always present ( X for example) the code works ok.

How can I check for the node having no properties?

[acoder]

Welcome to TSDN!

Check for the firstChild property:
[CODE=javascript]if (node.firstChil d) ...[/CODE]

[gregerly]

Firefox treats white space as children. Therefor, you can not use "firstChild " because in firefox, the first child may be white space. You would be better off doing something like this (using the summary tag as the main source of info)

<script type='text/javascript'>
var summary = document.getElementsByTagName('Summary')[0];//grab the first summary tag
var total = summary.getElementsByTagName('Total')[0];//grab the first Total tag within the summary tag
var totalValue = total.firstChild.nodeValue;
alert(totalValue);//should alert '30'
</script>

Using the getElementsByTa gName will always work, where as firstChild may or may not (depending on browser)

Greg

[Noddy]

thanks for the welcome and the help Greg, but it still fails for the empty node 'PrimaryName' - this field may or may not have data in it.

[gits]

hi ...

when testing for existence you may (should ;) ) always use:

[CODE=javascript]
if (typeof node_list[idx] != 'undefined') {
// do something
} else {
// do something other
}
[/CODE]
kind regards ...