ajax and php string

**nokmaster** · Nov 15th, 2009, 09:32 AM

Hi,

is it possible to use Ajax send request using php string as an Input?

like this:

Code:

function ajaxFunction() {
  var getdate = new Date();l
  if(xmlhttp) { 
  //	var txtname = document.getElementById("txtname");
    xmlhttp.open("POST","testing.php",true); 
    xmlhttp.onreadystatechange  = handleServerResponse;
    xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xmlhttp.send("txtname=" + $test); // im not sure if this is correct to call the php string
  }
}

<?php

$test = "ABCDEF";

?>

i want to use php string '$test' as an input. is this really possible?

**nokmaster** · Nov 15th, 2009, 09:33 AM

@Admin/Mod

Sorry please move to the right section.

Thanks!

**si_the_geek** · Nov 15th, 2009, 11:43 AM

Thread moved from the 'CodeBank PHP' forum to the 'PHP' forum

**kows** · Nov 15th, 2009, 12:12 PM

no, you can't do it like that (just because of the way you've set it up would be just the wrong way to go about it) -- but you could do it in general. however, once that variable is echoed out into your JavaScript function, it will -not- be able to be changed. HTML and JavaScript are static once they are loaded in the browser.

this would work:

PHP Code:


<?php

$test = "ABCDEF";

?>

<script language="javascript">
function ajaxFunction() {
  var getdate = new Date();l
  if(xmlhttp) { 
  //    var txtname = document.getElementById("txtname");
    xmlhttp.open("POST","testing.php",true); 
    xmlhttp.onreadystatechange  = handleServerResponse;
    xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xmlhttp.send("txtname=" + <?php echo $test; ?>); // im not sure if this is correct to call the php string
  }
}
</script>

but, note the jump into 'PHP' in the middle of your JavaScript function -- this would make your JavaScript function display as this to your browser:

Code:

<script language="javascript">
function ajaxFunction() {
  var getdate = new Date();l
  if(xmlhttp) { 
  //	var txtname = document.getElementById("txtname");
    xmlhttp.open("POST","testing.php",true); 
    xmlhttp.onreadystatechange  = handleServerResponse;
    xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xmlhttp.send("txtname=ABCDEF"); // im not sure if this is correct to call the php string
  }
}
</script>

if that's what you wanted, then that would work fine. you just have to make sure you set the value of $test before you are echoing this function to the browser.

if you need something more dynamic, you could try having your function take in a string parameter and then set that parameter during the event that you're calling the function.

**nokmaster** · Nov 15th, 2009, 06:22 PM

@kows

Thanks for your help

i am going to try it later and post feedback.

B.R,

**nokmaster** · Nov 15th, 2009, 06:44 PM

Hi kows,

seems it is not working on the code you've provided the first one

i tried this:

Code:

<?php

$test = "ABCDEF";

?>

<html>
<head>
<title>PHP and AJAX</title>

<script type="text/javascript">
 
var time_variable;
 
function getXMLObject()  //XML OBJECT
{
   var xmlHttp = false;
   try {
     xmlHttp = new ActiveXObject("Msxml2.XMLHTTP")  // For Old Microsoft Browsers
   }
   catch (e) {
     try {
       xmlHttp = new ActiveXObject("Microsoft.XMLHTTP")  // For Microsoft IE 6.0+
     }
     catch (e2) {
       xmlHttp = false   // No Browser accepts the XMLHTTP Object then false
     }
   }
   if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
     xmlHttp = new XMLHttpRequest();        //For Mozilla, Opera Browsers
   }
   return xmlHttp;  // Mandatory Statement returning the ajax object created
}
 
var xmlhttp = new getXMLObject();	//xmlhttp holds the ajax object
 
function ajaxFunction() {
  var getdate = new Date();  //Used to prevent caching during ajax call
  if(xmlhttp) { 
    xmlhttp.open("POST","test2.php",true);
    xmlhttp.onreadystatechange  = handleServerResponse;
    xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xmlhttp.send("txtname=" + <?php echo $test; ?>); // This line is not working
   // xmlhttp.send("txtname=ABCDEF"); // This is working fine
  }
}
 
function handleServerResponse() {
   if (xmlhttp.readyState == 4) {
     if(xmlhttp.status == 200) {
       document.getElementById("message").innerHTML=xmlhttp.responseText; //Update the HTML Form element 
     }
     else {
        alert("Error during AJAX call. Please try again");
     }
   }
}
</script>

<form name="myForm">
<table>
 <tr>
  <td colspan="2"><input type="button" value="Submit" onClick="ajaxFunction();" /></td>
 </tr> 
</table>
<div id="message" name="message"></div> 
</form>

</head>
</html>

**kows** · Nov 15th, 2009, 07:23 PM

err, I merely copied and pasted what you had and fixed the way PHP would be input to the browser. I did reflect on what WOULD work in my example, but didn't edit the PHP stuff. anyway -- I guess that's partly my fault, but you should really learn the syntax of whichever languages you're playing around with before attempting to do something such as ajax. javascript, like I explained before, is static code once it's sent to the browser. so, when in doubt, you could just check the source of whatever you're making.

this line of PHP:

xmlhttp.send("txtname=" + <?php echo $test; ?>); // This line is not working

creates this line of JavaScript:

xmlhttp.send("txtname=" + ABCDEF); // This line is not working

of course, since you haven't defined ABCDEF as a variable in JavaScript, this would simply send an empty string. so, you need to change the PHP to the following, so that JavaScript knows you're sending a string and not trying to reference a variable:

xmlhttp.send("txtname=<?php echo $test; ?>");

**nokmaster** · Nov 15th, 2009, 07:30 PM

Hi,

Kows,

Code:

xmlhttp.send("txtname=<?php echo $test; ?>");

This is working fine now. i am going to practice ajax and jscript

Thank you

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