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'ajaxRequest' is null or not an object

newphpcoder

By newphpcoder
in Javascript Help

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newphpcoder Advanced Member

newphpcoder

Posted
Posted

Hi....

 

I have form which I put save function on the last textbox:

here is my code:

 

<?php
    error_reporting(0);
   date_default_timezone_set("Asia/Singapore"); //set the time zone  
$con = mysql_connect('localhost', 'root','');

if (!$con) {
    echo 'failed';
    die();
}
mysql_select_db("mes", $con);
?>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
<html> 
<head> 
<script type="text/javascript" >  

var input_size = 1;

function checkTextBox(bc){
   var barcode_ =  bc.tabIndex;
   
   if ( bc.value.length > input_size ) 
        { 
            for(i=0; i<document.barcode.elements.length; i++) 
            { 
                      if( document.barcode.elements[i].tabIndex == (barcode_+1) ) 
                     {    
                         document.barcode.elements[i].focus(); 
                         break; 
                     } 
          } 
    }         
} 

function postSet() {
    if (window.event.keyCode==13 || window.event.keyCode==10) {
        document.getElementById('code_read_box6').disabled = true;
        save();
        alert('code_read_box6');
    }
}

</script> 

<script type="text/javascript"> 
var ajaxTimeOut = null;
var ajaxTimeOutOperator = null; 
var responsePHP; // = "no_reply"
var responsePHPOperator;
var changeFocus; //= false;
var transactionWasSaved;

function remoteRequestObject() {
    var ajaxRequest = false;
    try {
        ajaxRequest = new XMLHttpRequest();
    }
    catch(err) {
        try{
            ajaxRequest = new ActiveXObject("MSxml2.XMLHTTP");
        }
        catch(err) {
            try{
                ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch(err){
                // --> change to DOM alert("Not Supported Browser") + err.description;
                notify('Not Supported Browser.');
                return false;
            }
        }
    }
    return ajaxRequest;
} 

var ajaxRequest; // = remoteRequestObject();
var ajaxRequestOperator;
</script>

<script type="text/javascript">
function save() {            
    ajaxRequest.onreadystatechange = function () {
    if (ajaxRequest.readyState==4 && ajaxRequest.status==200) {
       var result = ajaxRequest.responseText;
       
        alert (result);
           
           if (result == "failed") {
            document.getElementById('code_read_box6').disabled = false;
            document.getElementById('code_read_box6').value = "";
            document.getElementById('code_read_box6').focus();
            notify("Please scan again.");
           }
           
           if (result == "saved") {
              alert(result);
              notify("Transaction has been saved.");
              reset();
           }   
           
       }     
    }      
   
    
var url = "save_barcode.php";   

ajaxRequest.open("POST", url, true);
ajaxRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
ajaxRequest.setRequestHeader("Content-length", parameters.length);
ajaxRequest.setRequestHeader("Connection", "close");
ajaxRequest.send(parameters);
}

</script> 

</head> 
<body onLoad="document.barcode.code_read_box1.focus();"> 
<form name="barcode" > 
<input type="text" tabindex="1" id="code_read_box1" value="" onkeyup="checkTextBox(this);"/><br/> 
<input type="text" tabindex="2" id="code_read_box2" value="" onkeyup="checkTextBox(this);"/><br/> 
<input type="text" tabindex="3" id="code_read_box3" value="" onkeyup="checkTextBox(this);"/><br/> 
<input type="text" tabindex="4" id="code_read_box4" value="" onkeyup="checkTextBox(this);"/><br/> 
<input type="text" tabindex="5" id="code_read_box5" value="" onkeyup="checkTextBox(this);"/><br/> 
<input type="text" tabindex="6" id="code_read_box6" value="" onkeyup="checkTextBox(this);" onkeypress="postSet()"/><br/> 
</form> 
</body> 

</html>

 

I got an error:

'ajaxRequest' is null or not an object on line 72

 

It display the error when I press enter on the last textbox.

 

Sorry, I'm not familiar in ajax..I hope somebody can help me

 

Thank you

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https://forums.phpfreaks.com/topic/261995-ajaxrequest-is-null-or-not-an-object/
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newphpcoder Advanced Member

newphpcoder

Posted
  • Author
Posted

Thank you it resolves my error:, but when I run my code I got a new error:

 

error: 'parameters' is undefined on line 121

 


<?php
    error_reporting(0);
   date_default_timezone_set("Asia/Singapore"); //set the time zone 
$con = mysql_connect('localhost', 'root','');

if (!$con) {
    echo 'failed';
    die();
}
mysql_select_db("mes", $con);
?>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript" > 

var input_size = 1;

function checkTextBox(bc){
   var barcode_ =  bc.tabIndex;
  
   if ( bc.value.length > input_size )
        {
            for(i=0; i<document.barcode.elements.length; i++)
            {
                      if( document.barcode.elements[i].tabIndex == (barcode_+1) )
                     {   
                         document.barcode.elements[i].focus();
                         break;
                     }
          }
    }        
}

function postSet() {
    if (window.event.keyCode==13 || window.event.keyCode==10) {
        document.getElementById('code_read_box6').disabled = true;
        save();
        alert('code_read_box6');
    }
}

</script>

<script type="text/javascript">
var ajaxTimeOut = null;
var ajaxTimeOutOperator = null;
var responsePHP; // = "no_reply"
var responsePHPOperator;
var changeFocus; //= false;
var transactionWasSaved;

function remoteRequestObject() {
    var ajaxRequest = false;
    try {
        ajaxRequest = new XMLHttpRequest();
    }
    catch(err) {
        try{
            ajaxRequest = new ActiveXObject("MSxml2.XMLHTTP");
        }
        catch(err) {
            try{
                ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch(err){
                // --> change to DOM alert("Not Supported Browser") + err.description;
                notify('Not Supported Browser.');
                return false;
            }
        }
    }
    return ajaxRequest;
}

//var ajaxRequest; // = remoteRequestObject();
var ajaxRequest = remoteRequestObject();
var ajaxRequestOperator;
</script>

<script type text/javascript>
function reset(){
                       document.getElementById('code_read_box1').disabled = false;
                       document.getElementById('code_read_box2').disabled = false;
                       document.getElementById('code_read_box3').disabled = false;
                       document.getElementById('code_read_box4').disabled = false;
                       document.getElementById('code_read_box5').disabled = false;
                       document.getElementById('code_read_box6').disabled = false;
                      
                       //reset
                       document.getElementById('code_read_box1').value = "";
                       document.getElementById('code_read_box2').value = "";
                       document.getElementById('code_read_box3').value = "";
                       document.getElementById('code_read_box4').value = "";
                       document.getElementById('code_read_box5').value = "";
                       document.getElementById('code_read_box6').value = "";
                      
                      
}
</script>

<script type="text/javascript">
function save() {           
    ajaxRequest.onreadystatechange = function () {
    if (ajaxRequest.readyState==4 && ajaxRequest.status==200) {
       var result = ajaxRequest.responseText;
      
        alert (result);
          
           if (result == "failed") {
            document.getElementById('code_read_box6').disabled = false;
            document.getElementById('code_read_box6').value = "";
            document.getElementById('code_read_box6').focus();
            notify("Please scan again.");
           }
          
           if (result == "saved") {
              alert(result);
              notify("Transaction has been saved.");
              reset();
           }  
          
       }    
    }     
  
   
var url = "save_barcode.php";  

ajaxRequest.open("POST", url, true);
ajaxRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
ajaxRequest.setRequestHeader("Content-length", parameters.length);
ajaxRequest.setRequestHeader("Connection", "close");
ajaxRequest.send(parameters);
}

</script>

</head>
<body onLoad="document.barcode.code_read_box1.focus();">
<form name="barcode" >
<input type="text" tabindex="1" id="code_read_box1" value="" onkeyup="checkTextBox(this);"/><br/>
<input type="text" tabindex="2" id="code_read_box2" value="" onkeyup="checkTextBox(this);"/><br/>
<input type="text" tabindex="3" id="code_read_box3" value="" onkeyup="checkTextBox(this);"/><br/>
<input type="text" tabindex="4" id="code_read_box4" value="" onkeyup="checkTextBox(this);"/><br/>
<input type="text" tabindex="5" id="code_read_box5" value="" onkeyup="checkTextBox(this);"/><br/>
<input type="text" tabindex="6" id="code_read_box6" value="" onkeyup="checkTextBox(this);" onkeypress="postSet()"/><br/>
</form>
</body>

</html>

 

 

 

Thank you

 

mrMarcus Member

mrMarcus

Posted
Posted

The error is referring to 'parameters' not being defined anywhere in your code:

 

ajaxRequest.open("POST", url, true);
ajaxRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
ajaxRequest.setRequestHeader("Content-length", parameters.length);
ajaxRequest.setRequestHeader("Connection", "close");
ajaxRequest.send(parameters);

 

What your function save() is supposed to do, by the looks of things, is save data to a database (I'm merely assuming that's what happens in save_barcode.php).

 

'parameters' would be a set of, well, parameters that contain values based on what your form is doing, and the overall intentions of your application.  I have no idea what your application is doing to be honest, and I'm wondering the same about you.

 

parameters should be something along the following, but obviously specific to what you're trying to achieve and based off values from your form (perhaps?):

 

var parameters = 'foo1=bar1&foo2=bar2';

 

Those values will be sent to 'save_barcode.php' to be processed.

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