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I have a little problem with extracting value of input from an HTML form. As I know, there is nothing wrong with my code, but I cannot find what's the problem.
<?php
error_reporting(E_ALL );
ini_set('display_errors', 1);
$t =<<<D
<form id="frm-send" method="post" action="index.php" >
<input type="text" name="data[postusername]" id="postusername" value="user" />
<input type="checkbox" name="data[save]" id="data[save]" value="1" />
<input type="hidden" name="secret" id="secret" value="0d35635c0cb11760789de6c4fe35e046311f724b" />
<input type="submit" name="btnSubmit" id="btnSubmit" value="Send" />
<input type="hidden" name="data[checkgetrequest]" value="true" id="data[checkgetrequest]" />
<input type="hidden" name="frm-id" value="13448477965028bfb44222d" id="frm-id" />
</form>
<input type="text" id="getfocus_txt_13448477965028bfb44222d" name="getfocus_txt_13448477965028bfb44222d" />
D;
$dom = new domDocument;
$dom->loadHTML($t);
$dom->preserveWhiteSpace = true;
$frmid = $dom->getElementById('frm-id') ;
echo $frmid->getAttribute('value');
?>
It shows me an error:
Fatal error: Call to a member function getAttribute() on a
non-object in E:\Apache\msg.php on line 22
I'm using XAMPP 1.7.3 on windows 7 . I tested it on my server and it showed me no errors. Any help would be appreciated.
401
From the DOMDocument::getElementById() docs:
For this function to work, you will need either to set some ID attributes with
DOMElement::setIdAttributeor a DTD which defines an attribute to be of type ID. In the later case, you will need to validate your document withDOMDocument::validateorDOMDocument::$validateOnParsebefore using this function.
Since your HTML is only a fragment, it does not specify a DTD, so you are left with dictating the ID attributes yourself. A basic example would look like:
$html = '<div><p id="a">Para A</p><p id="b">Para B</p></div>';
$dom = new DOMDocument;
$dom->loadHTML($html);
// Set the ID attribute to be "id" for each (non-ns) element that has one.
foreach ($dom->getElementsByTagName('*') as $element) {
if ($element->hasAttribute('id')) {
$element->setIdAttribute('id', true);
}
}
$p = $dom->getElementById('b');
echo $p->textContent; // Para B
As noted in comments on the doc page, you must declare a doctype for getElementById to perform as expected
t =<<<D
<!DOCTYPE html>
<form id="frm-send" method="post" action="index.php" >
...code continues ...
Per the documentation, a DTD must be specified for getElementById to understand which attribute of an element is used as the unique identifier. Declaring a doctype accomplishes this. You may also explicitly set this (without giving a DTD) by using setIdAttribute,
Documentation
28
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