DOMDocument - appendXML() 不适用于表单

Question

我遇到了 appendXML() 的问题，它不会将表单附加到 HTML。

现在我有这个代码

$domdocument = new DOMDocument();
$domdocument->loadHTML($html);
$domlookup = new DOMXPath($domdocument);
$formDivs = $domlookup->query("//*[contains(@class, 'formClass')]");
$frag = $domdocument->createDocumentFragment();
$frag->appendXML($formHTML);
for ($i = $formDivs->length - 1; $i > -1; $i--) {
    $formDivs->item($i)->parentNode->appendChild($frag);
}
@$html = $domdocument->saveHTML();

代码运行良好，并使用“formCLass”类简单的 HTML 附加到 div，如文本和带有文本的 div。但是，当涉及到附加表单时……嗯……那就是另一回事了。

我也尝试过追加使用

$frag->nodeValue = $formHTML;

而不是

$frag->appendXML($formHTML);

但是还是不行……

尝试

$frag->textContent = $formHTML;

会将表单输出为文本，显然这对我不起作用。

我该如何解决这个问题？

表格代码：

<form method="post">
<div class="fb-text form-group field-petname">
<label for="petname" class="fb-text-label">
"Pet Name"<span class="fb-required">*</span>
</label>
<input type="text" placeholder="Your Pet Name" required = "required" aria-required = "true" class="form-control" name="petname" id="petname">
</div>
<div class="fb-text form-group field-petowner">
<label for="petowner" class="fb-text-label">
"Pet owner"<span class="fb-required">*</span>
</label>
<input type="text" placeholder="Insert owner's name" required = "required" aria-required = "true" class="form-control" name="petowner" id="petowner">
</div>
<div class="fb-text form-group field-phone">
<label for="phone" class="fb-text-label">
"Phone number"<span class="fb-required">*</span>
</label>
<input type="text" placeholder="Phone number" required = "required" aria-required = "true" class="form-control" name="phone" id="phone">
</div>
<div>
<div id="goldenmembership">
<i class="fas fa-truck"></i>Free delivery!
</div>
</div>
<div class="fb-select form-group field-brand">
<label for="brand" class="fb-select-label">
What brand would your pet like?<span class="fb-required">*</span>
</label>
<select class="form-control" name="brand" id="brand" required = "required" aria-required = "true">
<option value="3x20" id="brand-1">Hills - 20€</option>
<option value="3x23" id="brand-2">BioPet - 23€</option>
</select>
</div>
</form>

Answer 1

我刚刚使用您的代码和我自己的一些 HTML 组合了一个非常简单的测试用例，它似乎可以附加，如下所示。

您的表单的 HTML 是否无效？

如果您仍然遇到问题，能否将您的 HTML 发布到某个地方，以便我们尝试一下？

$html = <<<HTML
<html>
    <body>
        <div class="formClass">
            <!-- Placeholder -->
        </div>
    </body>
</html>
HTML;

$formHtml = <<<HTML
<form action="#" method="post">
    <input type="text" id="test"/>
</form>
HTML;

$domdocument = new DOMDocument();
$domdocument->loadHTML($html);
$domlookup = new DOMXPath($domdocument);
$formDivs = $domlookup->query("//*[contains(@class, 'formClass')]");
$frag = $domdocument->createDocumentFragment();
$frag->appendXML($formHtml);
for ($i = $formDivs->length - 1; $i > -1; $i--) {
    $formDivs->item($i)->parentNode->appendChild($frag);
}
$html = $domdocument->saveHTML();

echo $html;

HTML 输出：

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html>
    <body>
        <div class="formClass">
            <!-- Placeholder -->
        </div>
    <form action="#" method="post">
    <input type="text" id="test">
</form></body>
</html>