Backslash Disappears from Filename

Question

This is my code:

<script>
document.getElementById(div').innerHTML = '<a href="javascript:void(0);" onclick="openPhpFile (\'asdasD\\Asdeqw.txt\');">efff</a>';
</script>

When the openPhpFile function runs, I alert the filename, and the \ characters are gone, even though they are doubled. addslashes() doesn't help; what can it be?

Answer 1

You should do this instead:

<script type='text/javascript'>
  (function () { // Closures are your friend
    // Declare variables
    var theDiv, theLink;
    // Create the link and assign attributes
    theLink = document.createElement('a');
    theLink.innerHTML = 'efff';
    theLink.href = '#';
    theLink.onclick = function () {
      openPhpFile('asdasD\\Asdeqw.txt');
    };
    // Get a reference to the container, empty the container and add the link
    theDiv = document.getElementById('div');
    theDiv.innerHTML = '';
    theDiv.appendChild(theLink);
  })();
</script>

Remember that if you are echoing the from PHP inside double quotes, you will actually need 4 backslashes. This is because PHP will also use the double backslash sequence, and would only output one. So if you want PHP to echo 2 backslashes, you need to put 4 in.