I am using AJAX for the first time so I write a code and I followed a tutorial, but when I try to send my post with ajax I am getting undefined index and I really don´t know why, I tried to search answer hear but since I am using AJAX and javascript for the first time, the code there didn´t tell me anything. Here is my code, I would be really greatful for any help, thank you.
js method
function post() {
var name = $('meno').val();
var priez = $('priezvisko').val();
$.post( "aktualizuj.php", {
'meno': name,
'priezvisko': priez
},
function (data) {
$('#result').html(data);
}
);
}
html form...
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script type="text/javascript" src="prihlasenie.js"></script>
</head>
<body>
<form>
<label for="meno" >Meno:</label><input type ="text" name="meno" id="meno" value ="meno" ><br>
<label for="priezvisko" >Priezvisko:</label><input type ="text" id="priezvisko" name="priezvisko" value ="priezvisko" ><br>
<input type="button" value="ulozZmeny" onclick="post()" >
</form>
<div id="result"></div>
</body>
</html>
this where I should get from ajax/javascript
session_start();
require "pripojenie.php";
$meno = $_POST['meno'];
$priezvisko = $_POST["priezvisko"];
$login = $_SESSION['login'];
jquery doesn't serialize key:value pairs where value is undefined, i.e.
$.post(url, { foo:undefined });
results in jquery not sending any POST parameter.
The problem is because of the following lines,
var name = $('meno').val();
var priez = $('priezvisko').val();
This would look for an element meno and an element priezvisko (and then their values) as if you had a document like
<p>
<meno>...</meno>
<priezvisko>...</priezvisko>
</p>
But you're looking for elements that have meno/priezvisko as value of their id attribute(s):
var name = $('#meno').val();
var priez = $('#priezvisko').val();
You should nevertheless check the existince of the parameters in your php script. Nothing prevents another script/bot/user to invoke your script with different parameters or no parameters at all.
see also: