#25838 [Bgs]: Dom_Node->child_nodes() is not live as the W3C DOM specification demands
ID: 25838
Updated by: chregu@php.net
Reported By: Martin dot Honnen at arcor dot de
Status: Bogus
Bug Type: DOM XML related
Operating System: Windows XP
PHP Version: 4.3.3
New Comment:
Just for your Information:
Once we have implemented NodeLists in the new ext/dom for PHP5, this
should work as expected by the W3C.
Previous Comments:
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[2003-10-13 05:29:14] Martin dot Honnen at arcor dot de
But the DOM specification says "changes are automatically reflected in
the NodeList, without further action on the user's part". If you have
to call child_nodes() again and again to have it updated then changes
are not automatically reflected in the NodeList. Compare a simple
JavaScript program to be run in Mozilla:
var xmlDocument = document.implementation.createDocument('', '',
null);
var rootElement = xmlDocument.createElement('gods');
xmlDocument.appendChild(rootElement);
var childNodes = rootElement.childNodes;
for (var i = 0; i < 5; i++) {
var god = xmlDocument.createElement('god');
god.setAttribute('name', 'god ' + i);
rootElement.appendChild(god);
alert(childNodes.length);
}
You will find that childNodes.length is incremented although childNodes
is created outside of the loop.
------------------------------------------------------------------------
[2003-10-12 22:15:27] sniper@php.net
It works fine when you actually set the $childNodes variable inside the
for() loop.
------------------------------------------------------------------------
[2003-10-11 12:23:04] Martin dot Honnen at arcor dot de
Description:
------------
The W3C DOM Level 2 specification at
http://www.w3.org/TR/DOM-Level-2-Core/core.html#td-live
says about NodeList collections that they should be live, meaning
if a DOM user gets a NodeList object containing the children of an
Element, then subsequently adds more children to that element (or
removes children, or modifies them), those changes are automatically
reflected in the NodeList, without further action on the user's part.
However my test with PHP 4.3.3 and the following settings for DOMXML
DOM/XML enabled
DOM/XML API Version 20020815
libxml Version 20507
HTML Support enabled
XPath Support enabled
XPointer Support enabled
DOM/XSLT enabled
libxslt Version 1.0.30
libxslt compiled against libxml Version 2.5.7
shows that the result returned from Node->child_nodes() is not live but
static.
Reproduce code:
---------------
<?php
function dumpDoc ($xmlDocument) {
echo "<p><pre>\n";
echo htmlentities($xmlDocument->dump_mem(true));
echo "</pre></p>\n";
}
$xmlDocument = domxml_new_doc("1.0");
$rootElement = $xmlDocument->create_element("gods");
$xmlDocument->append_child($rootElement);
$childNodes = $rootElement->child_nodes();
echo 'count($childNodes): ' . count($childNodes) . "<br>\n";
$xmlDocument->append_child($rootElement);
for ($i = 0; $i < 5; $i++) {
$god = $xmlDocument->create_element("god");
$god->set_attribute("name", "god $i");
$rootElement->append_child($god);
dumpDoc($xmlDocument);
echo 'count($childNodes): ' . count($childNodes) . "<br>\n";
}
?>
Expected result:
----------------
I would expect count($childNodes) to be incremented every time
$rootElement->append_child($god) is called. That is what the W3C DOM
understands to be a live collection, and that is what happens with
conformant DOM implementations (as the one in Mozilla or the one in
SUN's Java SDK 1.4).
Actual result:
--------------
The output with dump_mem shows that child elements are added but the
output of count($childNodes) is always 0.
------------------------------------------------------------------------
--
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Thread (4 messages)