Assigning a php variable from a javascript variable

Question

I am trying to set a php variable for use in a later page with out using $_GET or $_POST. I am also assigning the same variable to a text box. I already have the function to assign the textbox variable but not the php variable.

function setText(data){
 document.getElementById("filtext").value = data.value
 // <?php $_SESSION["provid"] = ?> 
 // I am trying to set the php variable above
}

Any help would be greatly appreciated!

• Rodrigo: you need something like ajax to send it as either a get or post variable
• tymeJV: PHP = server, JavaScript = client - they can't interact how you want. Use AJAX.
• HartleySan: Cookies would work, but Ajax is your best bet.

Answer 1

I think in this case, setting a cookie would be the easiest solution. By setting the cookie using Javascript, the cookie key and value will automatically be sent to PHP with the next page request.

See also:

• http://www.w3schools.com/js/js_cookies.asp, especially "A Function to Set a Cookie"
• http://www.w3schools.com/php/php_cookies.asp, especially "How to Retrieve a Cookie Value?"

Answer 2

To send a value for a server-side language you can use AJAX.

function setPHPVariable()
{
 var myAjax;
 if (window.XMLHttpRequest)
 {// code for IE7+, Firefox, Chrome, Opera, Safari
 myAjax=new XMLHttpRequest();
 }
 else
 {// code for IE6, IE5
 myAjax=new ActiveXObject("Microsoft.XMLHTTP");
 }
 myAjax.onreadystatechange=function()
 {
 if (myAjax.readyState==4 && myAjax.status==200)
 {
 alert('PHP returned: ' + myAjax.responseText);
 }
 }
 myAjax.open("GET","my_file.php?my_var=12345", true);
 myAjax.send();
}

In your PHP code, you can use:

$myVar = $_GET['my_var'];
$_SESSION['my_var'] = $myVar; // or even $_SESSION['my_var'] = $_GET['my_var'];

http://www.w3schools.com/ajax/ajax_examples.asp