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Описание

class DOMDocument {

DOMElement getElementById ( string elementId )

}

This function is similar to DOMDocument->getElementsByTagName() but searches for an element with a given id.

For this function to work, you will need either to set some ID attributes with DOMElement->setIdAttribute() or a DTD which defines an attribute to be of type ID. In the later case, you will need to validate your document with DOMDocument->validate() or DOMDocument->validateOnParse before using this function.

Примеры

Пример 1. DOMDocument->getElementById() Example


<?php



$doc = new DomDocument;



// We need to validate our document before refering to the id

$doc->validateOnParse = true;

$doc->Load('book.xml');



echo "The element whose id is books is: " . $doc->getElementById('books')->tagName . "\n";



?>

Результат выполнения данного примера:

The element whose id is books is: chapter

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DOMDocument->getElementById()

dagfinn at reiersol dot com
18-Sep-2007 02:06


Here is an updated link to the getElementById() pitfalls page:



http://wiki.flux-cms.org/display/BLOG/GetElementById+Pitfalls

simon at somewhere dot com
29-Jan-2007 08:07


SAVE YOURSELF A MAJOR HEADACHE AND A LOT OF SEARCHING THROUGH DOCUMENTATION - 



Instead of using $object->setAttribute('id', 'id_name_here')

USE THIS: $object->setAttribute('xml:id', 'id_name_here')



Then, to get the node value: $domDocumentObject->getElementById('id_name_here');



The xml:id attribute should AUTOMATICALLY be defined!!



Woohoo!  That was easy......

jonbarnett at gmail dot com
01-Nov-2006 08:36


If your XML document does not have a DTD that defines the "id" attribute as an ID, then the easiest thing to do is to use XPath->query() to find an element that matches "//[@id='x']"

Tangui dot Le-Pense at laposte dot net
08-Apr-2006 06:00


Validating a document from a DTD so as to use getElementById is sometimes impossible (for example when the head and body elements are not included yet in a XHtml document : the validation failed).

Fortunately, xml:id is supported by this function :)

That may be useful.

http://www.w3.org/TR/xml-id/

20-Dec-2005 07:04


If you're trying to use getElementById with a xml file validated on a xsd file you must first use the schemaValidate function or getElementById will return null

Example:



  $dom = new DomDocument();

  $dom->load("users.xml");

  $dom->schemaValidate("users.xsd");



  $curruser = $dom->getElementById($user->name);

bart at mediawave dot nl
11-Sep-2005 04:46


It seems getElementById works fine without setting validateOnParse to true. Which is nice since setting this to true caused some performance problems with my script.

chregu at php dot net
02-Jul-2004 04:37


http://wiki.bitflux.org/GetElementById_Pitfalls has an overview, of how to make getElementById work with aribtrary XML documents.

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DOMDocument->getElementById()

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