CODEWITHSUNDEEP
phpdom
user1825190
user1825190

Reputation: 117

how to find line number for DOM elements in php?

I want to check whether a <img> tag has alt="" text or not and also need to find what line number in DOM that img tag is. At the moment I have the following codes written but stuck with finding the line number. for example:

$doc = new DOMDocument();
$doc->loadHTMLFile('http://www.google.com');
$htmlElement = $doc->getElementsByTagName('html');
$tags = $doc->getElementsByTagName('img');
echo $tags->item(0)->getLineNo();
foreach ($tags as $image) {
    // Get sizes of elements via width and height attributes
    $alt = $image->getAttribute('alt');
    if($alt == ""){
       $src = $image->getAttribute('src'); 
       echo "No alt text ";  
      echo '<img src="http://google.com/'.$src.'" alt=""/>'. '<br>';
    }
    else{
       $src = $image->getAttribute('src'); 
         echo '<img src="http://google.com/'.$src.'" alt=""/>'. '<br>';            
    }             
}

from the above code at the moment I am getting images and text saying that "no alt text" beside the image, but I want to get what line number that img tag appears. for example here the line number is 57, 

56. <div class="work_item">
57. <p class="pich"><img src="images/works/1.jpg"    alt=""></p>
58. </div>

Upvotes: 1

Views: 1558

Answers (3)

user1825190
user1825190

Reputation: 117

I think i have figured out what i was trying to achieve but not sure is that the right way. It is doing the job. Please leave comments or any other idea how can i improve it. If you go to the following site and type any URL. It will produce a report with accessibility issues in a webpage. It is an accessibility checker tool.

http://valet.webthing.com/page/

All i am trying to do is achieve that kind of layout. The code below will produce the DOM of supplied URL and find any image tag that does not have alternative text.

<html>
<body>
    <?php
    $dom = new domDocument;
// load the html into the object
    $dom->loadHTMLFile('$yourURLAddress');
// keep white space
    $dom->preserveWhiteSpace = true;
// nicely format output
    $dom->formatOutput = true; 
    $new = htmlspecialchars($dom->saveHTML(), ENT_QUOTES);
    $lines = preg_split('/\r\n|\r|\n/', $new); //split the string on new lines
    echo "<pre>";
    //find 'alt=""' and print the line number and html tag
    foreach ($lines as $lineNumber => $line) {

        if (strpos($line, htmlspecialchars('alt=""')) !== false) {
            echo "\r\n" . $lineNumber . ". " . $line;
        }
    }
    echo "\n\n\nBelow is the whole DOM\n\n\n";
    //print out the whole DOM including line numbers
    foreach ($lines as $lineNumber => $line) {
        echo "\r\n" . $lineNumber . ". " . $line;
    }
    echo "</pre>";
    ?>   
 </body> 
</html>

I like to thank everyone who helped specially "chwagssd" and Mike Johnson.

Upvotes: 0

Francis Avila
Francis Avila

Reputation: 31621

Use DOMNode::getLineNo(), e.g.$line = $image->getLineNo().

Upvotes: 1

Niet the Dark Absol
Niet the Dark Absol

Reputation: 324620

HTML has no real concept of line numbers, since they are just whitespace.

With that in mind, you might be able to count how many newlines there are in all the text nodes preceding the target node. You might be able to do this with DOMXPath:

$xpath = new DOMXPath($doc);
$node = /* your target node */;
$textnodes = $xpath->query("./preceding::*[contains(text(),'\n')]",$node);
$line = 1;
foreach($textnodes as $textnode) $line += substr_count($textnode->textContent,"\n");
// $line is now the line number of the node.

Please note that I have not tested this, nor have I ever used axes in xpath.

Upvotes: 0

Related Questions