[TIMOB-1350] Ti.XML.DOMDocument.getElementById fails on iPhone

GitHub Issue	n/a
Type	Bug
Priority	Trivial
Status	Closed
Resolution	Fixed
Resolution Date	2011-04-17T01:55:56.000+0000
Affected Version/s	n/a
Fix Version/s	Release 1.5.0
Components	iOS
Labels	domelement, iphone, xml
Reporter	Brion Vibber
Assignee	Reggie Seagraves
Created	2011-04-15T02:50:10.000+0000
Updated	2011-04-17T01:55:56.000+0000

Description

getElementById in the DOM proxy classes on iPhone fails, consistently returning null instead of expected elements.

Example:
var dom = Ti.XML.parseString('

'); var foo = dom.getElementById('foo'); Titanium.API.info('#foo is ' + foo);

Output on iPhone:
[INFO] #foo is null

The Android implementation gives expected output:
[INFO] [306,493] #foo is ti.modules.titanium.xml.ElementProxy@43e66460

The bug:

The XPath expression used to implement getElementById doesn't quote the string, leading to an XPath parse failure, and no results:

NSArray *nodes = [document nodesForXPath:[NSString stringWithFormat:@"//*[@id=%@]",args] error:&error];

Suggested fix is to add quotes:

NSArray *nodes = [document nodesForXPath:[NSString stringWithFormat:@"//*[@id='%@']",args] error:&error];

Probably this should actually check for validity first as well, or else escape the string.

Comments

Brion Vibber 2011-04-15
Provisional fix as a git branch:
http://github.com/brion/titanium_mobile/commit/14b88d7e760ed39146f5b59c6440aba23fec4a6a"> http://github.com/brion/titanium_mobile/commit/14b88d7e760ed39146f5...
Brion Vibber 2011-04-15
Adding "[PATCH]" to title.
Brion Vibber 2011-04-15
Further fix to return a single node instead of a NodeList. There really need to be some comprehensive unit tests on this module!

http://github.com/brion/titanium_mobile/commit/d725741f9ec56997499001b20f54ca25dde412a9"> http://github.com/brion/titanium_mobile/commit/d725741f9ec569974990...

Full branch: http://github.com/brion/titanium_mobile/commits/getelementbyid">http://github.com/brion/titanium_mobile/commits/getelementbyid
Brion Vibber 2011-04-15
Assigning open patches from StatusNet to our support contact per request.
Brion Vibber 2011-04-15
Nolan, any issues with this patch? Is there someone else we should be assigning bugs to?
Jeff Haynie 2011-04-15
merged.
MistX 2011-04-15
Hi,

I have the same problem that getElementById() returns null. I changed the class TiDOMDocumentProxy.m, but there is still the same problem.

var f = Titanium.Filesystem.getFile("test.xml");
var textString = f.read();
var textNode = textString.toString();

var xml = Ti.XML.parseString(textNode);
var foo = xml.getElementById('node_one');
alert(foo);

Have you any ideas?

TiA,
-Marc

Pedro Enrique 2011-04-15

Tested on iPhone 4 (4.2) and on simulator running 4.0, 4.1, and 4.2
SDK 1.5 (12/8/10) - r47a03e70
no problems found
code:

   var win = Ti.UI.createWindow();
   var xml = '<all>';
   xml += '    <one>hello</one>';
   xml += '    <two>world</two>';
   xml += '    <three id="foo">hello world</three>';
   xml += '</all>';
   var dom = Ti.XML.parseString(xml); 
   var foo = dom.getElementById('foo'); 
   Ti.API.info('#foo is ' + foo);
   Ti.API.info('#foo\'s text is ' + foo.text);
   win.open();

info: #foo is [object TiDOMElement]
info: #foo's text is hello world

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