issue when insert text to db using js - php

Question

i try to submit text to db, but in the db field not inserted any text.
can you analyze where my false?
i try like this.
Thanks for your help.
<script type="text/javascript">
$(document).ready(function() {
$('#myForm').submit(function() {
var namaklasifier = document.getElementByName("tfklasifier").value;
var inputpos= document.getElementByName("tacaripos").value;
var inputnet = document.getElementByName("tacarinet").value;
var inputneg = document.getElementByName("tacarineg").value;
$.ajax({
type: 'POST',
url: $(this).attr('action'),
data: $(this).serialize(),
success: function(data) {
$('#resultcoba').html(data);}
})
return false;
});
})
</script>
<form id="myForm" method="post" action="proses.php">
<td align="center" valign="top" style="width:420px"><textarea style="width:420px" name="tacaripos" rows="4" cols="70"><?PHP echo htmlspecialchars($_POST['tacaripos']);?></textarea></td>
<td align="center" valign="top" style="width:420px"><textarea style="width:420px" name="tacarinet" rows="4" cols="70"><?PHP echo htmlspecialchars($_POST['tacarinet']);?></textarea></td>
<td align="center" valign="top" style="width:420px"><textarea style="width:420px" name="tacarineg" rows="4" cols="70"><?PHP echo htmlspecialchars($_POST['tacarineg']);?></textarea></td>
</tr>
<td align="center"><input type="submit" name="btklasifier" id="btklasifier" value="Buat" /></td></form>
proses.php
<?php
$namaklasifier=$_POST['namaklasifier'];
$jadipos=$_POST['inputpos'];
$jadinet=$_POST['inputnet'];
$jadineg=$_POST['inputneg'];
$link=mysqli_connect("localhost", "root", "","skripsi");
mysqli_select_db($link,"skripsi");
mysqli_query($link,"INSERT INTO namaklasifier(username,datapos,datanet,dataneg,user) VALUES('$namaklasifier','$jadipos','$jadinet','$jadineg','{$_SESSION['username']}')"); ?>
Thanks :)

Answer 1

You are trying to access the GET data under the variable names you have declared here:
var namaklasifier = document.getElementByName("tfklasifier").value;
var inputpos= document.getElementByName("tacaripos").value;
var inputnet = document.getElementByName("tacarinet").value;
var inputneg = document.getElementByName("tacarineg").value;
Yet you are sending them using $(this).serialize() which means you must access the GET variables using the input name as this is what serialize does (creates an object from the form elements using their names). e.g.
$jadipos=$_POST['tacaripos'];
$jadinet=$_POST['tacarinet'];
$jadineg=$_POST['tacarineg'];
Also you need to change $_GET to $_POST as that is the method you are using.

Answer 2

In proses.php, change the $_GET into $_POST.
Since you are using POST method to submit data, naturally, you have to use the $_POST variables.

Answer 3

They are POST values not the GET ones
$jadipos=$_POST['inputpos'];
$jadinet=$_POST['inputnet'];
$jadineg=$_POST['inputneg'];
And try to use mysqli_* functions or PDO statements,instead of mysql_* functions due to they are deprecated
EDIT:also try like
var namaklasifier = document.getElementByName("tfklasifier").value;
var inputpos= document.getElementByName("tacaripos").value;
var inputnet = document.getElementByName("tacarinet").value;
var inputneg = document.getElementByName("tacarineg").value;
$.ajax({
type: 'POST',
url: $(this).attr('action'),
data: {inputpos:inputpos,inputnet:inputnet,inputneg:inputneg},
success: function(data) {
$('#resultcoba').html(data);}
})
return false;
});