php教程

The DOMElement class

(PHP 5, PHP 7)

类摘要

DOMElement extends DOMNode {
/* 属性 */
readonly public bool $schemaTypeInfo ;
readonly public string $tagName ;
/* 继承的属性 */
public readonly string $nodeName ;
public string $nodeValue ;
public readonly int $nodeType ;
public readonly DOMNode $parentNode ;
public readonly DOMNodeList $childNodes ;
public readonly DOMNode $firstChild ;
public readonly DOMNode $lastChild ;
public readonly DOMNode $previousSibling ;
public readonly DOMNode $nextSibling ;
public readonly DOMNamedNodeMap $attributes ;
public readonly DOMDocument $ownerDocument ;
public readonly string $namespaceURI ;
public string $prefix ;
public readonly string $localName ;
public readonly string $baseURI ;
public string $textContent ;
/* 方法 */
public __construct ( string $name [, string $value [, string $namespaceURI ]] )
public getAttribute ( string $name ) : string
public getAttributeNode ( string $name ) : DOMAttr
public getAttributeNodeNS ( string $namespaceURI , string $localName ) : DOMAttr
public getAttributeNS ( string $namespaceURI , string $localName ) : string
public getElementsByTagName ( string $name ) : DOMNodeList
public getElementsByTagNameNS ( string $namespaceURI , string $localName ) : DOMNodeList
public hasAttribute ( string $name ) : bool
public hasAttributeNS ( string $namespaceURI , string $localName ) : bool
public removeAttribute ( string $name ) : bool
public removeAttributeNode ( DOMAttr $oldnode ) : bool
public removeAttributeNS ( string $namespaceURI , string $localName ) : bool
public setAttribute ( string $name , string $value ) : DOMAttr
public setAttributeNode ( DOMAttr $attr ) : DOMAttr
public setAttributeNodeNS ( DOMAttr $attr ) : DOMAttr
public setAttributeNS ( string $namespaceURI , string $qualifiedName , string $value ) : void
public setIdAttribute ( string $name , bool $isId ) : void
public setIdAttributeNode ( DOMAttr $attr , bool $isId ) : void
public setIdAttributeNS ( string $namespaceURI , string $localName , bool $isId ) : void
/* 继承的方法 */
public DOMNode::appendChild ( DOMNode $newnode ) : DOMNode
public DOMNode::C14N ([ bool $exclusive [, bool $with_comments [, array $xpath [, array $ns_prefixes ]]]] ) : string
public DOMNode::C14NFile ( string $uri [, bool $exclusive = FALSE [, bool $with_comments = FALSE [, array $xpath [, array $ns_prefixes ]]]] ) : int
public DOMNode::cloneNode ([ bool $deep ] ) : DOMNode
public DOMNode::getLineNo ( void ) : int
public DOMNode::getNodePath ( void ) : string
public DOMNode::hasAttributes ( void ) : bool
public DOMNode::hasChildNodes ( void ) : bool
public DOMNode::insertBefore ( DOMNode $newnode [, DOMNode $refnode ] ) : DOMNode
public DOMNode::isDefaultNamespace ( string $namespaceURI ) : bool
public DOMNode::isSameNode ( DOMNode $node ) : bool
public DOMNode::isSupported ( string $feature , string $version ) : bool
public DOMNode::lookupNamespaceUri ( string $prefix ) : string
public DOMNode::lookupPrefix ( string $namespaceURI ) : string
public DOMNode::normalize ( void ) : void
public DOMNode::removeChild ( DOMNode $oldnode ) : DOMNode
public DOMNode::replaceChild ( DOMNode $newnode , DOMNode $oldnode ) : DOMNode
}

属性

schemaTypeInfo

Not implemented yet, always return NULL

tagName

The element name

注释

Note:

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.

Table of Contents

User Contributed Notes

johnny 03-Mar-2014 03:48
Get html of a node
 $html .= $dom->saveHTML($node);
Janne Enberg 07-Nov-2013 11:02
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.
felix dot klee at inka dot de 26-Feb-2013 03:23
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);

?>
loopduplicate at burningtoken dot com 22-Apr-2011 02:34
This works perfect for me as well:

<?php $xml = $domElement->ownerDocument->saveXML($domElement); ?>
Anonymous 24-Dec-2010 08:22
you can use DOMNode::nodeValue
DOMElement inherits this public property.

$elem->nodeValue
dpetroff ( at ) gmail.com 04-Dec-2010 11:24
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;
}
?>
nawaman at gmail dot com 03-Sep-2009 08:08
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";
?>
Daniel Morlock 07-May-2009 09:22
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();
}
?>
patrick smith 04-Nov-2008 08:14
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();
}
?>
Pinochet 25-Oct-2008 05:33
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 ;-)
j DOT wagner ( AT ) medieninnovation.com 08-Oct-2008 09:11
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.
Severin 14-Sep-2008 06:18
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;
   }
?>
ae.fxx 18-Jul-2008 01:49
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

CopyRight © 2008-2022 verySource.Com All Rights reserved. 京ICP备17048824号-1 京公网安备:11010502034788