Save JavaScript variable to file via php

Question

I am fairly new to programming, and was trying to save a JavaScript variable to an existing file:

<script src="./jquery.js"></script>
<script>
var data = inputs
function saveLists(){
$.ajax({
 type: 'POST',
 url: "save.php",
 data: "data",
 success: function(){
 alert("success!")},
 error: function(){
 alert("Failed!")},
 dataType: "text"
})
}
</script>

I define the inputs variable earlier, and I am using POST method and the following php server side:

<?php
$data = $_POST["data"];
$f = fopen('Inputs.txt', 'a+');
fwrite($f, $data);
fclose($f);
?>

When I call the saveLists() function the success alert comes up, but the data is not written to Inputs.txt. Any ideas on what I am doing wrong?

• Niet the Dark Absol: data: "data" so you are just sending the string "data" and PHP is complaining about an undefined index but you're ignoring it.
• Mikey: data needs to be a query string e.g. data: 'data=something' or an object e.g. data: { data: 'something' }.
• fdomn-m: If you get the success: then it's most likely the php is not handling it correctly.

Answer 1

PHP is trying to read an index which doesn't exist, data is not a valid index & key. Try something like this:

data: {
 "data" : data
}

Also, don't trust all code that the server receives in PHP.