DOM 删除选定的子节点

发布于 2024-12-28 10:42:06 字数 316 浏览 1 评论 0原文

我在聊天中有一个带有 html 的 dom 元素，其中包含一些我想删除的 html 元素，同时仍然保留一些没问题的标签。

我尝试遍历子元素所有子元素并删除那些需要删除的元素

foreach ($node->getElementsByTagName('*') as $element)
    if ($element->nodeName != 'br')
        $node->removeChild($element);

但这会引发“未找到错误”异常，该异常未被捕获会导致致命错误。我该如何解决这个问题？

原文

I have a dom element with html inside chat contains some html elements I'd like to remove, while still keeping some tags that are ok.

I try to iterate through child elements all child elements and delete those that need to be removed

foreach ($node->getElementsByTagName('*') as $element)
    if ($element->nodeName != 'br')
        $node->removeChild($element);

But this throws a Not Found Error exception which not being caught causes a fatal error.
How would I solve this problem ?

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酒与心事 2025-01-04 10:42:06

使用以下命令来删除节点：

$element->parentNode->removeChild($element);

Use the following instead to remove the node:

$element->parentNode->removeChild($element);

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心在旅行 2025-01-04 10:42:06

getElementsByTagName('*') 查找所有后代元素，而不是子元素。因此，您要删除的某些 $element 不是 $node 的子级，因此失败。

我不是 100% 确定您的意图是什么，但很可能您只是想删除某些直接子级。在这种情况下，请执行以下操作：

$nodestoremove = array();
foreach ($node->childNodes as $n) {
    if ($n->nodeType===XML_ELEMENT_NODE and $n->nodeName!=='br') {
        $nodestoremove[] = $n;
    }
}
foreach ($nodestoremove as $n) {
    $node->removeChild($n);
}
unset($nodestoremove); // so nodes can be garbage-collected

echo $node->C14N(); // xml fragment after removal

请注意，我们进行了两次传递：一次用于标识要删除的节点，第二次用于删除。这是因为 childNodes 是一个活动列表，因此我们在删除时无法向前迭代它。（尽管我们可以向后迭代它。）

getElementsByTagName('*') finds all descendent elements, not child elements. So some of the $element you want to remove are not children of $node, hence the failure.

I'm not 100% sure what your intention is here, but most likely you just want to remove certain immediate children. In this case, do the following:

$nodestoremove = array();
foreach ($node->childNodes as $n) {
    if ($n->nodeType===XML_ELEMENT_NODE and $n->nodeName!=='br') {
        $nodestoremove[] = $n;
    }
}
foreach ($nodestoremove as $n) {
    $node->removeChild($n);
}
unset($nodestoremove); // so nodes can be garbage-collected

echo $node->C14N(); // xml fragment after removal

Note that we make two passes: one to identify the nodes to delete, and a second pass to delete. This is because childNodes is an active list, so we can't iterate through it forwards as we delete. (Although we could iterate through it backwards.)

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