Insert parsed JSON into html - php

Question

I've tried many methods, from tutorials and other questions posted but nothing seems to work. I'm trying to get data sent from php into divs and variables with jquery. I have the array set up on the php side, and everything works fine but on the jquery side i always get an unexpected identifier error or the div is left blank or both
var var_numdatacheck = <?php echo $datacheck; ?>;
var var_rowtest = parseInt(var_numdatacheck);
function waitupdate(){
$.ajax({
type: 'POST',
url: 'update.php',
data: {function: '3test', datacheck: var_rowtest},
dataType: "json",
success: function(check) {
var data = JSON.parse(check);
var_rowtest = data[id]; // sets the variable numcheck as the new id number
$('#datacheck').html(data[0]); // I've confirmed data[0] has a value but the div is left blank
}
error: function(msg) {
console.log(msg)// here i get an unexpected identifier error
}
});
}
$(document).ready(function() {
waitupdate();
});
The output from the php is
{"id":"4","0":"Name"}
here is the actual php code
<?php
require "dbc.php";
$function = $_POST['function'];
$datacheck = $_POST['datacheck'];
$search="SELECT * FROM Feedtest ORDER BY id DESC";
$request = mysql_query($search);
$update= mysql_fetch_array($request);
$updateid = $update['id'];
$updatecheck = mysql_num_rows($request);
$data = array();
if ($function == $datacheck){
echo $updatecheck;
echo $datacheck;
}
if ($function == "3test" && $updatecheck > $datacheck ) {
$updatesearch="SELECT * FROM Feedtest WHERE id = '$updateid' ORDER BY id DESC";
$updatequery = mysql_query($updatesearch);
$check['id'] = $updateid;
while ($row = mysql_fetch_array($updatequery)){
?>
<?php $check[]= $row['First Name']; ?>
<?php
}
echo json_encode($check);
}
?>
</div>
</ul>

Answer 1

This will work for you,
var var_rowtest = data['id'];
var value= data[0];
set variable var_rowtest and value in your div as needed.
I guess var_rowtest = data[id]; is not a proper syntax, use above syntax

Answer 2

Please try and change your variable names, and that error function declared in the $.ajax threw a JS error for me.
Another thing that is unnecessary is the JSON.parse - I made the PHP script called "update.php" return back the correct header:
<?php header('content-type: application/json');?>
This code works:
var numDataCheck = 1,
rowTest = parseInt(numDataCheck);
function waitupdate() {
$.ajax({
type: 'POST',
url: 'update.php',
data: {function: '3test', datacheck: rowTest}, dataType: "json",
success: function(data) {
rowTest = data.id;
$('#datacheck').html(data[0]);
}
});
}
$(document).ready(function() {
waitupdate();
});