The getElementsByTagName function is failing to retrieve all of the child nodes

Looking for assistance with XML parsing

str = "<ROOT><CATEGORY_AREA_LIST><CATEGORY_AREA NAME='General'><CATEGORY_TYPE NAME='MOC'><PROPOSED_LEVEL NAME='3'></PROPOSED_LEVEL></CATEGORY_TYPE><CATEGORY_TYPE NAME='General'><PROPOSED_LEVEL NAME='3'></PROPOSED_LEVEL></CATEGORY_TYPE></CATEGORY_AREA><CATEGORY_AREA NAME='BOO'><CATEGORY_TYPE NAME='Open'><PROPOSED_LEVEL NAME='1'></PROPOSED_LEVEL></CATEGORY_TYPE><CATEGORY_TYPE NAME='NOC'><PROPOSED_LEVEL NAME='5'></PROPOSED_LEVEL></CATEGORY_TYPE></CATEGORY_AREA></CATEGORY_AREA_LIST></ROOT>"

I have a JavaScript function that's only returning one entry for CATEGORY_AREA, but I need to access all entries. Can you help me troubleshoot what might be going wrong?

My goal is to navigate through all category_area, category_type, and proposed_level elements in the XML string.

Your guidance is appreciated!

javascriptxmlxml-parsinggetelementsbytagname

Answer №1

To view the XML document generated by the DOM Parser, simply insert console.log(xmlDoc) into your code.

https://i.sstatic.net/VDwkV.png

If there are errors present, you may notice that the CATEGORY_AREA_LIST element does not contain any child nodes.

You can utilize a tool like xmllint (readily available on most UNIX systems and even on Windows 10) to pinpoint specific errors within your XML structure.

Updated version:

After rectifying your XML file, the issue cannot be replicated anymore:

str = "<ROOT><CATEGORY_AREA_LIST><CATEGORY_AREA NAME='General'><CATEGORY_TYPE NAME='MOC'><PROPOSED_LEVEL NAME='3'></PROPOSED_LEVEL></CATEGORY_TYPE><CATEGORY_TYPE NAME='General'><PROPOSED_LEVEL NAME='3'></PROPOSED_LEVEL></CATEGORY_TYPE></CATEGORY_AREA><CATEGORY_AREA NAME='BOO'><CATEGORY_TYPE NAME='Open'><PROPOSED_LEVEL NAME='1'></PROPOSED_LEVEL></CATEGORY_TYPE><CATEGORY_TYPE NAME='NOC'><PROPOSED_LEVEL NAME='5'></PROPOSED_LEVEL></CATEGORY_TYPE></CATEGORY_AREA></CATEGORY_AREA_LIST></ROOT>"
var dp = new DOMParser();    
var xmlDoc = dp.parseFromString(str , "text/xml");
var list = xmlDoc.getElementsByTagName("CATEGORY_AREA_LIST");
var categoryArea = list[0].childNodes;
console.log(categoryArea.length)

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