problem passing variable to php file

Question

I really dont know why this isnt working!

<script src="js/jquery.js" type="text/javascript" language="javascript"></script>

<script type="text/javascript">

function updateVAL()
{
var f = document.getElementById("nu");
var val=f.value;
alert(val); // it displays the value properly 
$.post("getDATA.php", {id: val}); // I sent the variable with jquery
}

</script>

getDATA.php

$value=$_POST['id'];
echo $value;

and when I access getDATA.php to see if it was sent I get this:

Notice: Undefined index: id in C:\Users\dan...

why the variable 'id' isnt set ? why is isnt passed to the server ?

Any help would be appreciated :) Cheers,

dan.

When you say when I access getDATA.php to see if it was sent do you mean via Firebug or Web Inspector? — alex
– alex, Commented Aug 30, 2011 at 6:24
I'm not sure about this, but did you try to put quotes in id? Like this: $.post("getDATA.php", {"id": val}); — Vithozor
– Vithozor, Commented Aug 30, 2011 at 6:26
try putting $_POST['id'] to some file instead of echo. i guess you will see it. — k102
– k102, Commented Aug 30, 2011 at 6:26

k102 · Accepted Answer · 2011-08-30 06:37:26Z

3

Parameters are being sent via ajax - so this js script calls getDATA.php and $_POST['id'] is "seen" there only at that time.

And you are trying to access getDATA.php after and send no post or get parameters by your briwser - so you don't see this params there.

You have to catch echo by your js script. Look at this demo:

$.post("test.php", { name: "John", time: "2pm" },
   function(data) {
     alert("Data Loaded: " + data);
   });

answered Aug 30, 2011 at 6:37

k102

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1 Comment

dan Over a year ago

ohhh I understand now! I did what u said and the value was retrieved to js after it was echoed by getDATA.php many thx to u and all that helped :)

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