XML DOM Parser Errors
When Firefox encounter a parser error, it loads an XML document
containing the error
Parser Error in Firefox
When trying to open an XML document, a parser-error may occur.
Unlike Internet Explorer, if Firefox encounters an error, it loads an XML
document containing the error description.
The root node name of the XML error document is "parsererror". This is used
to check if there is an error.
XML Error
In the following code we let the parser load an XML document that is not well-formed.
(You can read more about well-formed and valid XML in our
XML tutorial)
Example
xmlDoc=document.implementation.createDocument("","",null);
xmlDoc.async=false;
xmlDoc.load("note_error.xml");
if (xmlDoc.documentElement.nodeName=="parsererror")
{
errStr=xmlDoc.documentElement.childNodes[0].nodeValue;
errStr=errStr.replace(/</g, "<");
document.write(errStr);
}
else
{
document.write("XML is valid");
}
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Try it yourself »
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Look at the XML file: note_error.xml
Example explained:
- Load the xml file
- Check if the nodeName of the root node is "parsererror"
- Load the error string into a variable "errStr"
- Replace "<" characters with "<" before the error string can be
written as HTML
Note: Only Internet Explorer will actually check your XML against the
DTD. Firefox will not.
Cross Browser Error Check
Here we have created an XML load function that checks for parser errors in
both Internet Explorer and Firefox:
Example
function loadXMLDocErr(dname)
{
try //Internet Explorer
{
xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async=false;
xmlDoc.load(dname);
if (xmlDoc.parseError.errorCode != 0)
{
alert("Error in line " + xmlDoc.parseError.line +
" position " + xmlDoc.parseError.linePos +
"\nError Code: " + xmlDoc.parseError.errorCode +
"\nError Reason: " + xmlDoc.parseError.reason +
"Error Line: " + xmlDoc.parseError.srcText);
return(null);
}
}
catch(e)
{
try //Firefox
{
xmlDoc=document.implementation.createDocument("","",null);
xmlDoc.async=false;
xmlDoc.load(dname);
if (xmlDoc.documentElement.nodeName=="parsererror")
{
alert(xmlDoc.documentElement.childNodes[0].nodeValue);
return(null);
}
}
catch(e) {alert(e.message)}
}
try
{
return(xmlDoc);
}
catch(e) {alert(e.message)}
return(null);
}
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Try it yourself »
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Look at the XML file: note_error.xml
Example explained - Internet Explorer:
- The first line creates an empty Microsoft XML document object
- The second line turns off asynchronized loading, to make sure that the
parser will not continue execution of the script before the document is
fully loaded
- The third line tells the parser to load an XML document called "note_error.xml"
- If the errorCode property of the parseError object is different from
"0", alert the error and exit the function
- If the errorCode property is "0", return the XML document
Example explained - Firefox:
- The first line creates an empty XML document object.
- The second line turns off asynchronized loading, to make sure that the
parser will not continue execution of the script before the document is
fully loaded.
- The third line tells the parser to load an XML document called "note_error.xml".
- If the returned document is an error document, alert the error and exit
the function
- If not, return the XML document
The Creators of XMLSpy are Pleased to Announce
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