trying to change a php variable via js and echo back but its not working, been on it for days!!
I have a function handleServerResponse() called below, that alerts connection status, and getting the ok at status 200 so cant understand why my php variabe is not changing! driving me insane!
function process() // send the info to the server
{
if(xmlHttp)
{
try
{
xmlHttp.open("GET","myFile.php?phpvar="+jsvar,true);
xmlHttp.onreadystatechange = handleServerResponse; //alerts connection status = all ok
xmlHttp.send(null);
}
catch(e)
{
alert(e.toString());
}
}
}
// server side script
<?php
echo '<?xml version="1.0" encoding = "UTF-8" standalone = "yes" ?>';
$phpvar;
$phpvar = $_GET['phpvar'];
echo "new phpvar value = ".$phpvar;
?>
Any help at all would be greatly appreciated. Cheers
The following code achieves the aim you've stated. Not sure what your problem is, since you've neglected to post a complete example.
phpVarTest.html
<!DOCTYPE html>
<html>
<head>
<script>
"use strict";
function byId(e){return document.getElementById(e);}
window.addEventListener('load', onDocLoaded, false);
function myAjaxGet(url, callback)
{
var ajax = new XMLHttpRequest();
ajax.onreadystatechange = function()
{
if (this.readyState==4 && this.status==200)
callback(this);
}
ajax.onerror = function()
{
console.log("AJAX request failed to: " + url);
}
ajax.open("GET", url, true);
ajax.send();
}
function onDocLoaded()
{
byId('testBtn').addEventListener('click', onTestBtnClicked, false);
}
function onTestBtnClicked(e)
{
var jsvar = 'some arbitrary text';
var url = 'phpVarTest.php?phpvar='+jsvar;
myAjaxGet(url, onAjaxDone);
}
function onAjaxDone(ajaxObj)
{
byId('outputDiv').innerText = ajaxObj.response;
}
</script>
<style>
</style>
</head>
<body>
<button id='testBtn'>Initiate ajax request</button>
<div id='outputDiv'></div>
</body>
</html>
phpVarTest.php
// server side script
<?php
echo '<?xml version="1.0" encoding = "UTF-8" standalone = "yes" ?>';
$phpvar;
$phpvar = $_GET['phpvar'];
echo "new phpvar value = ".$phpvar;
?>
output
// server side script
<?xml version="1.0" encoding = "UTF-8" standalone = "yes" ?>new phpvar value = some arbitrary text
Note: you should place the comment in the php file inside of the php tags - otherwise, you'll see it in the output, as shown above.