Change innerHTML of a php DOMElement [duplicate]

Answer 1

here is how you do it:

$doc = new DOMDocument('');
$label = $doc->createElement('label');

$label->appendChild($doc->createTextNode('test'));
$li->appendChild($label);

echo $doc->saveHTML();

Answer 2

Here is a replace by class function I just wrote:

It will replace the innerHtml of a class. You can also specify the node type eg. div/p/a etc.

function replaceInnerHtmlByClass($html, $replace=null, $class=null, $nodeType=null){
  if(!$nodeType){ $nodeType = '*'; }
  $dom = new DOMDocument();
  $dom->loadHTML($html);
  $xpath = new DOMXPath($dom);
  $nodes = $xpath->query("//{$nodeType}[contains(concat(' ', normalize-space(@class), ' '), '$class')]");
  foreach($nodes as $node) {
    while($node->childNodes->length){
      $node->removeChild($node->firstChild);
    }
    $fragment = $dom->createDocumentFragment();
    $fragment->appendXML($replace);
    $node->appendChild($fragment);
  }
  return $dom->saveHTML($dom->documentElement);
}

---

Here is another function I wrote to remove nodes with a specific class but preserving the inner html.

Setting replace to true will discard the inner html.

Setting replace to any other content will replace the inner html with the provided content.

function stripTagsByClass($html, $class=null, $nodeType=null, $replace=false){
  if(!$nodeType){ $nodeType = '*'; }
  $dom = new DOMDocument();
  $dom->loadHTML($html);
  $xpath = new DOMXPath($dom);
  $nodes = $xpath->query("//{$nodeType}[contains(concat(' ', normalize-space(@class), ' '), '$class')]");
  foreach($nodes as $node) {
    $innerHTML = '';
    $children = $node->childNodes;
    foreach($children as $child) {
      $tmp = new DOMDocument();
      $tmp->appendChild($tmp->importNode($child,true));       
      $innerHTML .= $tmp->saveHTML();
    }
    $fragment = $dom->createDocumentFragment();
    if($replace !== null && $replace !== false){
      if($replace === true){ $replace = ''; }
      $innerHTML = $replace;
    }
    $fragment->appendXML($innerHTML);
    $node->parentNode->replaceChild($fragment, $node);
  }
  return $dom->saveHTML($dom->documentElement);
}

Theses functions can easily be adapted to use other attributes as the selector.

I only needed it to evaluate the class attribute.

Answer 3

Developing on from Joanna Goch's answer, this function will insert either a text node or an HTML fragment:

function nodeFromContent($node, $content) {
    //creates a text node, or dom node if content contains html 
    $lt = strpos($content, '<');
    $gt = strrpos($content, '>');
    if (!($lt === false || $gt === false) && $gt > $lt) {
        //< followed by > means potentially contains HTML
        $DOMInnerHTML = new DOMDocument();
        $DOMInnerHTML->loadHTML($content);
        $contentNode = $DOMInnerHTML->getElementsByTagName('body')->item(0);
        $newNode = $node->ownerDocument->importNode($contentNode, true);
    } else {
        $newNode = $node->ownerDocument->createTextNode($content); 
    }
    return $newNode;
}

usage

$newNode = nodeFromContent($node, $content);
$node->parentNode->insertBefore($newNode, $node);
//or $node->appendChild($newNode) depending on what you require

Answer 4

function setInnerHTML($DOM, $element, $innerHTML) {
  $node = $DOM->createTextNode($innerHTML);
  $element->appendChild($node);
}