Details - Web 2.0 & AJAX :: Permission denied ??!

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  • 04-21-2006 20:34:55 GMT +2 moutaz salahat

    Hi all,

    I am new to AJAX technology.

    I have tried to write a web app to retrieve the telephone number of some person and my code was :

    <html ><head>
    <script>
    var xmlHttp; 
    function callServer()
    {

    try {
      xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (e2) {
        xmlHttp = false;
      }
    }
    if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
      xmlHttp = new XMLHttpRequest();
    }
    var name =document.getElementById("name").value;
    var sURL = "http://localhost/telephone.php?name="+name;
    xmlHttp.open("GET",sURL,true);
    xmlHttp.onreadystatechange = writeResponse; }

    function writeResponse()
    {
    if(xmlHttp.readyState == 4)
    {
    var e = document.getElementById("number");
    e.value = xmlHttp.responseText;
    }
    }

    </script>
    </head>

    <body>

    <div align="center">
     <div align="center">
      <table border="0" style="border-collapse: collapse" width="266" bordercolor="#FFFFFF" bordercolorlight="#000000" bordercolordark="#808080" bgcolor="#FFFFFF" dir="ltr" id="table1">
       <tr>
        <td width="79">Name</td>
        <td><input id="name" type="text" name="name" size="20"></td>
        <td width="74"><input type="button" value="Get" name="get" onclick="callServer()"></td>
       </tr>
       <tr>
        <td width="79">Telephone</td>
        <td><input id="number" type="text" name="number" size="20"></td>
        <td width="74">&nbsp;</td>
       </tr>
      </table>
     </div>
     <p>&nbsp;</div></body></html>

    and when I tried to view it an error message apeared which is "Permission denied" pointing to the read line in the code , and I ca not find an answer plz help me.

    I am using IE v 6.0

    • 04-26-2006 12:39:45 GMT +2 Andrei DRAGOMIR [InterAKT]Adobe Systems Romania staff

      Hello Moutaz. I took a look at your problem. The error message you are getting is because of security restrictions built in browsers to stop you from calling remote scripts on localhost, when you are accessing a page  other than localhost. Most likely, the address you are accessing when you are testing your page is not "http://localhost", and that is why you are getting the error. 

      Either try to :

      1. Access the test page also with "http://localhost"
      2. change the script so that it either has the corret server, or tries to autodetect it.

      I am attaching a version using the second way of solving this issue. 

      <html ><head>
      <script>
      var xmlHttp;
      function getServerName()
      {
          var str = window.location.protocol + '//' + window.location.hostname;
          return str;
      }
      function callServer()
      {

      try {
        xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
      } catch (e) {
        try {
          xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e2) {
          xmlHttp = false;
        }
      }
      if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
        xmlHttp = new XMLHttpRequest();
      }
      var name =document.getElementById("name").value;
      var sURL = getServerName() + "/telephone.php?name="+name;
      xmlHttp.open("GET",sURL,true);
      xmlHttp.onreadystatechange = writeResponse;
      xmlHttp.send(null);
      }

      function writeResponse()
      {
      if(xmlHttp.readyState == 4)
      {
      var e = document.getElementById("number");
      e.value = xmlHttp.responseText;
      }
      }

      </script>
      </head>

      <body>

      <div align="center">
       <div align="center">
        <table border="0" style="border-collapse: collapse" width="266" bordercolor="#FFFFFF" bordercolorlight="#000000" bordercolordark="#808080" bgcolor="#FFFFFF" dir="ltr" id="table1">
         <tr>
          <td width="79">Name</td>
          <td><input id="name" type="text" name="name" size="20"></td>
          <td width="74"><input type="button" value="Get" name="get" onclick="callServer()"></td>
         </tr>
         <tr>
          <td width="79">Telephone</td>
          <td><input id="number" type="text" name="number" size="20"></td>
          <td width="74">&nbsp;</td>
         </tr>
        </table>
       </div>
       <p>&nbsp;</div></body></html>

      The stuff I changed is in bold. Also, you were missing the call to xmlHttp.send which actually performs the request, so I added that too. 

      Hope this solves your issue.

      Regards, 

      Andrei
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