title: jQuery Ajax returns the whole page
body: <p>I have a jquery-ajax function that sends data to a php script and the problem is with the return value, it returns the whole page instead of single value.</p>
  
  <p>Thank you for your time and help.</p>
  
  <pre><code>$("#ajaxBtn").click(function(){
    var inputText = $("#testText").val();
  
    $.ajax({ type: "POST",
      url: "index.php",
      data: "testAjax="+inputText,
      dataType: "html",
      success: function(html){
        alert(html);
      }
    });
  });         
  </code></pre>