SunshinePHP Developer Conference 2015

The DOMElement class

(PHP 5)

Krótki opis klasy

DOMElement extends DOMNode {
/* Właściwości */
readonly public bool $schemaTypeInfo ;
readonly public string $tagName ;
/* Metody */
__construct ( string $name [, string $value [, string $namespaceURI ]] )
string getAttribute ( string $name )
DOMAttr getAttributeNode ( string $name )
DOMAttr getAttributeNodeNS ( string $namespaceURI , string $localName )
string getAttributeNS ( string $namespaceURI , string $localName )
DOMNodeList getElementsByTagName ( string $name )
DOMNodeList getElementsByTagNameNS ( string $namespaceURI , string $localName )
bool hasAttribute ( string $name )
bool hasAttributeNS ( string $namespaceURI , string $localName )
bool removeAttribute ( string $name )
bool removeAttributeNode ( DOMAttr $oldnode )
bool removeAttributeNS ( string $namespaceURI , string $localName )
DOMAttr setAttribute ( string $name , string $value )
DOMAttr setAttributeNode ( DOMAttr $attr )
DOMAttr setAttributeNodeNS ( DOMAttr $attr )
void setAttributeNS ( string $namespaceURI , string $qualifiedName , string $value )
void setIdAttribute ( string $name , bool $isId )
void setIdAttributeNode ( DOMAttr $attr , bool $isId )
void setIdAttributeNS ( string $namespaceURI , string $localName , bool $isId )
/* Metody dziedziczone */
public DOMNode DOMNode::appendChild ( DOMNode $newnode )
public string DOMNode::C14N ([ bool $exclusive [, bool $with_comments [, array $xpath [, array $ns_prefixes ]]]] )
public int DOMNode::C14NFile ( string $uri [, bool $exclusive [, bool $with_comments [, array $xpath [, array $ns_prefixes ]]]] )
public DOMNode DOMNode::cloneNode ([ bool $deep ] )
public int DOMNode::getLineNo ( void )
public string DOMNode::getNodePath ( void )
public bool DOMNode::hasAttributes ( void )
public bool DOMNode::hasChildNodes ( void )
public DOMNode DOMNode::insertBefore ( DOMNode $newnode [, DOMNode $refnode ] )
public bool DOMNode::isDefaultNamespace ( string $namespaceURI )
public bool DOMNode::isSameNode ( DOMNode $node )
public bool DOMNode::isSupported ( string $feature , string $version )
public string DOMNode::lookupNamespaceURI ( string $prefix )
public string DOMNode::lookupPrefix ( string $namespaceURI )
public void DOMNode::normalize ( void )
public DOMNode DOMNode::removeChild ( DOMNode $oldnode )
public DOMNode DOMNode::replaceChild ( DOMNode $newnode , DOMNode $oldnode )
}

Właściwości

schemaTypeInfo

Not implemented yet, always return NULL

tagName

The element name

Notatki

Informacja:

The DOM extension uses UTF-8 encoding. Use utf8_encode() and utf8_decode() to work with texts in ISO-8859-1 encoding or Iconv for other encodings.

Spis treści

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User Contributed Notes 13 notes

up
21
Pinochet
5 years ago
Hi to get the value of DOMElement just get the nodeValue public parameter (it is inherited from DOMNode):
<?php
echo $domElement->nodeValue;
?>
Everything is obvious if you now about this thing ;-)
up
21
j DOT wagner ( AT ) medieninnovation.com
6 years ago
Caveat!
It took me almost an hour to figure this out, so I hope it saves at least one of you some time.

If you want to debug your DOM tree and try var_dump() or similar you will be fooled into thinking the DOMElement that you are looking at is empty, because var_dump() says: object(DOMElement)#1 (0) { }

After much debugging I found out that all DOM objects are invisible to var_dump() and print_r(), my guess is because they are C objects and not PHP objects. So I tried saveXML(), which works fine on DOMDocument, but is not implemented on DOMElement.

The solution is simple (if you know it):
$xml = $domElement->ownerDocument->saveXML($domElement);

This will give you an XML representation of $domElement.
up
5
Daniel Morlock
5 years ago
It would be nice to have a function which converts a document/node/element into a string.

Anyways, I use the following code snippet to get the innerHTML value of a DOMNode:

<?php
function getInnerHTML($Node)
{
    
$Body = $Node->ownerDocument->documentElement->firstChild->firstChild;
    
$Document = new DOMDocument();    
    
$Document->appendChild($Document->importNode($Body,true));
     return
$Document->saveHTML();
}
?>
up
8
dpetroff ( at ) gmail.com
3 years ago
Hi!

Combining all th comments, the easiest way to get inner HTML of the node is to use this function:

<?php
function get_inner_html( $node ) {
   
$innerHTML= '';
   
$children = $node->childNodes;
    foreach (
$children as $child) {
       
$innerHTML .= $child->ownerDocument->saveXML( $child );
    }

    return
$innerHTML;
}
?>
up
4
Janne Enberg
11 months ago
This page doesn't list the inherited properties from DOMNode, e.g. the quite important textContent property. It would be immensely helpful if it would list those as well.
up
3
loopduplicate at burningtoken dot com
3 years ago
This works perfect for me as well:

<?php $xml = $domElement->ownerDocument->saveXML($domElement); ?>
up
2
nawaman at gmail dot com
5 years ago
The following code shows can text-only content be extracted from a document.

<?php
function getTextFromNode($Node, $Text = "") {
    if (
$Node->tagName == null)
        return
$Text.$Node->textContent;

   
$Node = $Node->firstChild;
    if (
$Node != null)
       
$Text = getTextFromNode($Node, $Text);

    while(
$Node->nextSibling != null) {
       
$Text = getTextFromNode($Node->nextSibling, $Text);
       
$Node = $Node->nextSibling;
    }
    return
$Text;
}

function
getTextFromDocument($DOMDoc) {
    return
getTextFromNode($DOMDoc->documentElement);
}

$Doc = new DOMDocument();
$Doc->loadHTMLFile("Test.html");
echo
getTextFromDocument($Doc)."\n";
?>
up
0
felix dot klee at inka dot de
1 year ago
How to rename an element and preserve attributes:

<?php

// Changes the name of element $element to $newName.
function renameElement($element, $newName) {
 
$newElement = $element->ownerDocument->createElement($newName);
 
$parentElement = $element->parentNode;
 
$parentElement->insertBefore($newElement, $element);

 
$childNodes = $element->childNodes;
  while (
$childNodes->length > 0) {
   
$newElement->appendChild($childNodes->item(0));
  }

 
$attributes = $element->attributes;
  while (
$attributes->length > 0) {
   
$attribute = $attributes->item(0);
    if (!
is_null($attribute->namespaceURI)) {
     
$newElement->setAttributeNS('http://www.w3.org/2000/xmlns/',
                                 
'xmlns:'.$attribute->prefix,
                                 
$attribute->namespaceURI);
    }
   
$newElement->setAttributeNode($attribute);
  }

 
$parentElement->removeChild($element);
}

function
prettyPrint($d) {
 
$d->formatOutput = true;
  echo
'<pre>'.htmlspecialchars($d->saveXML()).'</pre>';
}

$d = new DOMDocument( '1.0' );
$d->loadXML('<?xml version="1.0"?>
<library>
  <data a:foo="1" x="bar" xmlns:a="http://example.com/a">
    <invite>
      <username>jmansa</username>
      <userid>1</userid>
    </invite>
    <update>1</update>
  </data>
</library>'
);

$xpath = new DOMXPath($d);
$elements = $xpath->query('/library/data');
if (
$elements->length == 1) {
 
$element = $elements->item(0);
 
renameElement($element, 'invites');
}

prettyPrint($d);

?>
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1
ae.fxx
6 years ago
Hi there.

Remember to append a DOMNode (or any of its descendants) to a DOMDocument __BEFORE__ you try to append a child to it.

I don't know why it has to be this way but it can't be done without it.

bye
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0
patrick smith
5 years ago
Although it may be preferable to use the dom to manipulate elements, sometimes it's useful to actually get the innerHTML from a document element (e.g. to load into a client-side editor).

To get the innerHTML of a specific element ($elem_id) in a specific html file ($filepath):

<?php
$innerHTML
= '';
$doc = new DOMDocument();
$doc->loadHTMLFile($filepath);   
$elem = $doc->getElementById($elem_id);

// loop through all childNodes, getting html       
$children = $elem->childNodes;
foreach (
$children as $child) {
   
$tmp_doc = new DOMDocument();
   
$tmp_doc->appendChild($tmp_doc->importNode($child,true));       
   
$innerHTML .= $tmp_doc->saveHTML();
}
?>
up
0
Severin
6 years ago
I wanted to find similar Elements - thats why I built an Xpath-String like this - maybe somebody needs it... its not very pretty - but neither is domdocument :)

<?php

$dom
->load($xmlFile))

$xpathQuery = '//*';
$xmlNodes = $xpath->query($xpathQuery);
       
$pathlist = array();
$attrlist = array();
foreach (
$xmlNodes as $node) {

 
$depth = $this->_getDomDepth($node);   //get Path-Depth (for array key)
 
$pathlist[$depth] = $node->tagName;     // tagname
         
 
$attrs = $node->attributes;
 
$attr='';
 
$a=0;
  foreach (
$attrs as $attrName => $attrNode// attributes
           
{
              if (
$attrName !='reg')
              {
                if (
$a++!=0) $attr .= ' and ';
               
$attr .= '@'.$attrName.'='."'".$attrNode->value."'";
              }
            }
         
         
$attrlist[$depth] = $attr?'['.$attr.']':'';
         
         
$path = ''; for ($i=0;$i<=$depth;$i++) $path .= '/'.$pathlist[$i].$attrlist[$i];  // the xpath of the actual Element

    // ... now you can go on and user $path to find similar elements
   
}
  }
}

private function
_getDomDepth(DomNode $node)
   {
    
$r = -2;
     while (
$node) {
      
$r++; 
      
$node = $node->parentNode;
     }
     return 
$r;
   }
?>
up
-1
johnny
7 months ago
Get html of a node
$html .= $dom->saveHTML($node);
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-1
Anonymous
3 years ago
you can use DOMNode::nodeValue
DOMElement inherits this public property.

$elem->nodeValue
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