1196926 - nodeValue capped at 4096 bytes when parsing XML

Status: RESOLVED DUPLICATE of bug 890284

(Core :: DOM: Core & HTML, defect)

Description

[feedback]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36

Steps to reproduce:

I load an XML resource from the server into variable r. The resource's size is 762844 plus tags ('<index subset="1">...</index>'); everything else between the tags is digits, commas, and line feeds. Then the resource is parsed with the following code:

          var indices = r.getElementsByTagName('index');
          for(var i = 0; i < indices.length; i++)
             if (indices[i].getAttribute('subset') && indices[i].hasChildNodes())
                data.indices[indices[i].getAttribute('subset')] = indices[i].firstChild.nodeValue;



Actual results:

The value of indices[i].firstChild.nodeValue is capped to 4096 bytes. This only happens with Firefox 40.0 and Firefox 40.2; however it works perfectly well with Chrome, IE, and Opera.

By the way, I can use innerHTML, which will work. (But then I'd have to remove the tag; and Opera doesn't accept innerHTML for XML resources.)


Expected results:

The size of the nodeValue is 762844.

Comment 1

[Loic]

Could you provide a testcase (public URL if possible) to reproduce the issue, please.

Comment 2

[Alex Vincent [:WeirdAl]]

Possible dupe, bug 890284.

Comment 3

[feedback]

I provided a testcase for you. The real original code is huge. The JavaScript is in this file: http://quizzicalweb.com/bugreport/firefox_bug_1196926.js. Please ignore the AJAX code; but it's necessary to download an XML from some kind of source. The part where the error occurs comes at the end:

function bugcode(r)
{
    var BUGVAR;
    var indices = r.getElementsByTagName('index');
    for(var i = 0; i < indices.length; i++)
       if (indices[i].getAttribute('subset') && indices[i].hasChildNodes())
          {
          BUGVAR = indices[i].firstChild.nodeValue;
          if (BUGVAR.length == 4096)
             alert('This is the bug! Size of BUGVAR capped to 4096 instead of 106317.');
          else
             alert('Everyting\'s fine. Size: ' + BUGVAR.length);
          }      
}

[By the way, meanwhile I tested it on Safari, and Safari also does it right. It's only Firefox as far as I can see.]

Comment 4

[Olli Pettay [:smaug][[e-mail]]]

This is a dup of some old bug. hsivonen might recall which one.

And I think we really should fix the issue finally, even if XML is used less and less.