使用AJAX打开PHP文件

i am trying to execute a PHP file using AJAX, which is supposed to update a txt file

here is my javascript

    function getXMLHttp()
    {
      var xmlHttp

  try
  {
    //Firefox, Opera 8.0+, Safari
    xmlHttp = new XMLHttpRequest();
  }
  catch(e)
  {
    //Internet Explorer
    try
    {
      xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch(e)
    {
      try
      {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
      }
      catch(e)
      {
        alert("Your browser does not support AJAX!")
        return false;
      }
    }
  }
  return xmlHttp;
}



function MakeRequest()
{
  var xmlHttp = getXMLHttp();
  var host = window.location.hostname;
  var dir1=window.location.pathname.split("/")[1];
  var dir2=window.location.pathname.split("/")[2];
  var p = document.getElementById(\'CTI_IP\').value;
  var url=\'http://\'+host+\'/\'+dir1+\'/modules/company/include/file.php?var=\'+p;
  xmlHttp.open("POST",url,true);
  if (xmlHttp.readyState==4) 
 {
  xmlHttp.send();
 }
}

the url is fine, i alerted it, copy pasted the link, the php file is working perfect and updating the txt file but it won't work in ajax? why

thanks !!

You have a syntax error:

var p = document.getElementById(\'CTI_IP\').value;
                                ^HERE

(And similar ones scattered throughout).

This should have shown up in your browser's JavaScript error console.

When you build the URL, you are building it wrong. You are escaping quotes that don't need escaping. It should be built as follows:

var url = "http://" + host + "/" + dir1 + "/modules/company/include/file.php?var=" + p;

You are also escaping the quotes on your getElementById call for some unknown reason. It should be called as follows:

var p = document.getElementById("CTI_IP").value;

The only time you want to escape quotes is when you want them included in your string. In these instances, you shouldn't have escaped them because they denote a string - they aren't meant to be included.

I recommend that you research a little bit about how strings work in Javascript.

Once you've fixed those errors, remove the if block around your xmlHttp.send().

You have:

if (xmlHttp.readyState==4) 
{
    xmlHttp.send();
}

But should only have

xmlHttp.send();

Finally, since you don't include it in your example above, I'm assuming you aren't actually making a call to your MakeRequest() function anywhere. You have to call that function somewhere in your code to get it to actually execute the function.

Simply invoke the function as follows:

MakeRequest();