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Asked: 2026-06-13T19:20:55+00:00

So I’m new to Js & php and I’m trying to print out a

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So I’m new to Js & php and I’m trying to print out a piece of code from a call back function

<!DOCTYPE html>
<html lang="en">
    <head>
        <script>
            function loadXMLDoc()
            {
                var xmlhttp;
                if (window.XMLHttpRequest){
                  xmlhttp=new XMLHttpRequest();
                }
                else{
                  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
                }
                xmlhttp.onreadystatechange=function(){
                    if (xmlhttp.readyState==4 && xmlhttp.status==200){
                        document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
                    }
                }

                xmlhttp.open("GET","callback_json.php",true);
                xmlhttp.send();
            }
        </script>

        <title>Simple Cross Domain Ajax</title>

      </head>
  <body>

      <h1>.....</h1>
      <h2>.....</h2>
      <button onclick="loadXMLDoc();">Get Data</button>
      <div id="myDiv"><h2>...</h2></div>

  </body>
</html>

and my php file goes like

<?php
    $ch = curl_init();
    $url='someurl';
    $timeout = 5;
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
    $data = curl_exec($ch);
    curl_close($ch);
    echo "<script type='text/javascript' src='syntaxhighlighter/scripts/shCore.js'></script><script type='text/javascript' src='syntaxhighlighter/scripts/shBrushJava.js'></script><link href='syntaxhighlighter/styles/shCore.css' rel='stylesheet' type='text/css' /><link href='syntaxhighlighter/styles/shThemeDefault.css' rel='stylesheet' type='text/css' />";
    echo "<pre class='brush:java;'>";
    echo $data;
    echo "</pre>";
    echo '<script type="text/javascript">SyntaxHighlighter.highlight();</script>';
 ?>

And it seems syntax highlighter works on my php file but not after call back…I did some research and I know I’m supposed to use SyntaxHighlighter.highlight() instead of all() in the code but I’ve already done that. Is there any problem with my code structure?

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1 Answer

  1. Editorial Team

    <script> tags added by innerHTML are not executed by the browser. You need to execute them manually:

    var scripts = document.getElementById("myDiv").getElementsByTagName("script");
if (scripts && scripts.length) {
  for (var i =0; i<scripts.length; i++) {
    eval(scripts[i].innerHTML);
  }
}

    Alternatively you can re-append the script nodes to the page instead of evaling it:

    // ...
for (var i =0; i<scripts.length; i++) {
  var s = document.createElement('script');
  s.innerHTML = eval(scripts[i].innerHTML);
  document.body.appendChild(s);
}

    but this is exactly the same as evaling the code anyway (no really, think hard about it both methods execute the code unchecked).

    A better way is to avoid script injection altogether by adding the Syntaxhighlighter files at the top of the page and calling SyntaxHighlighter.highlight() after you’ve innerHTMLed the code.

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