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Editorial Team
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Asked: 2026-05-12T15:20:40+00:00

I’m looking for a way to check if a link exists on a certain

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I’m looking for a way to check if a link exists on a certain page. I know that this is possible with a ping, but I really don’t know how to do this.

What I have is a list of links to other webpages, they should have a backlink to my page also. I want to check this, when the backlink is there, a text should appear, something like “ok” and when the result is negative, something like “no backlink”

I know the urls of the pages where my link should appear, in case you need to know that.

Any help would be great!

I have found a piece of code wich I think could be used to serve my needs. I self don’t know how, but it would be great if anyone can help me with this.

This is the code:

<html>
  <head>
     <script language="javascript" type="text/javascript">
     <!--
        var ajax = new XMLHttpRequest();

        function pingSite() {
           ajax.onreadystatechange = stateChanged;
           ajax.open('GET', document.getElementById('siteToCheck').value, true);
           ajax.send(null);
        }

        function stateChanged() {
           if (ajax.readyState == 4) {
              if (ajax.status == 200) {
                 document.getElementById('statusLabel').innerHTML = "Success!";
              }
              else {
                 document.getElementById('statusLabel').innerHTML = "Failure!";
              }
           }
        }
     -->
     </script>
  </head>

  <body>
     Site To Check:<br />
     <input type="text" id="siteToCheck" /><input type="button"  onclick="javascript:pingSite()" />

     <p>
        <span id="statusLabel"></span>
     </p>
  </body>
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1 Answer

  1. Editorial Team

    You can’t natively use Javascript to parse external domains, I used a proxy page which sniffs the content and feeds it to the ajax callback.

    My solution basically grabs the source of the site to check and sees if a string, which can be your site link matches. I would assume this should be sufficient rather than trying to parse and look for anchors, but you can be as thorough as you want ( parse the whole thing as a DOM element and look for href attribute value ).

    Let me know if you run into any issues.

    <?php
    $query = isset($_POST['submitted']) ? true : false;
    if ( $query ) {
    $url = @file_get_contents( $_POST['site-url'] );
    if ( $url && strlen( $url ) > 0 ) {
        $checkFor = $_POST['check-for'];
        $match = preg_match( '/' . $checkFor . '/', $url );
        echo $match ? 'string (link) is found' : 'string not found';
    } else {
        echo 'could not connect to site..';
    }
    exit;
    }
?>
<form action="" id="site-checker">
    <div class="field">
    <label for="site-url">Site to check:</label>
    <input id="site-url" name="site-url" value="http://jquery.com">
    </div>
    <div class="field">
    <label for="check-for">Check for:</label>
    <input id="check-for" name="check-for" value="docs.jquery.com">
    </div>
    <input type="hidden" name="submitted" value="true">
    <input type="submit">
</form>

<div id="result"></div>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
<script>
    $('#site-checker').submit(function(e) {
    e.preventDefault();
    $.ajax({
        url:'check.php',
        type:'POST',
        data:$('#site-checker').serialize(),
        success:function(html) {
        $('#result').html( html );
        }
    });
    });
</script>
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