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Don't alert AJAX

I'm trying to get result and alert it if the solicitude was successful or not on the PHP file, it worked (because changed the results) but the AJAX didn't show alerts (No error and no "true")
js:
function addentrys() {
var nwentry = {};
el = document.getElementById('addname').value;
eldmn = document.getElementById('adddomain').value;
nwentry.name = el;
nwentry.domain = eldmn;
$.ajax({
type: 'POST',
url: 'api/domain',
dataType: 'json',
data: nwentry
}).done(function(data) {
alert(data);
});
}
php:
$app->post('/domain', function () {
$jsonContents = file_get_contents('data/data.json');
$name = $_POST['name'];
$domain = $_POST['domain'];
$data = json_decode($jsonContents, true);
$last_item = end($data);
$last_item_id = $last_item['id'];
$data[] = array(
'name' => $name,
'domain' => $domain,
'id' => $last_item_id+1
);
$json = json_encode($data);
file_put_contents('data/data.json', $json);
return true;
});

The result is probably not in JSON format, so when jQuery tries to parse it as such, it fails. You can catch the error with error: callback function.
You don't seem to need JSON in that function anyways, so you can also take out the dataType: 'json' row.

Fetching PHP Data with Javascript and assign it to an array

I've got a php script with collects data from a server and displays it in an array and after that as a json with the function.
echo json_encode($result);
Now I want to access that array with my javascript and display it. It should be saved in a var as an array so it should look like:
data = [ "xxxx" , "ssss",];
But I guess I can simply put in my function which gets the array data instead so it'd be:
data = myfunction ;
What I've tried so far:
function reqListener () {
console.log(this.responseText);
}
var oReq = new XMLHttpRequest(); //New request object
oReq.onload = function() {
};
oReq.open("get", "http://myserver.com/myscript.php", true);
oReq.send();
and
function getdata(url) {
jQuery.ajax(
{
type: "GET",
url: "http://myserver.com/myscript.php/",
dataType: "text",
success: function (response) {
var JSONArray = jQuery.parseJSON(response);
connsole.log(JSONArray);
}
});
}
But none seems to work and I get displayed 'undefined' instead of my arrays.
Would be really great if somebody has some ideas on that and can help me out.
Edit:
Since we are getting nowhere here's my php code:
<?php
error_reporting(0);
$html = file_get_contents("url here");
$dom = new DOMDocument();
$dom->loadHTML($html);
$tbodyRows = $dom->getElementsByTagName( 'tbody' )
->item( 0 ) // grab first tbody
->getElementsByTagName( 'tr' );
$result = array();
foreach( $tbodyRows as $tbodyRow )
{
$result[] = $tbodyRow->getElementsByTagName( 'td' )
->item( 2 ) // grab 3rd column
->nodeValue;
}
echo json_encode($result);
?>

Try this code:
function getdata(url) {
console.log('Started');
jQuery.ajax({
type: "GET",
url: "http://myserver.com/myscript.php",
dataType: "text",
error: function (xhr) {
console.log('Error',xhr.status);
},
success: function (response) {
console.log('Success',response);
}
});
}
Open the browser's console, and let me know about its contents. If you don't see Error or Success, your code isn't actually executing

I have done a similar thing earlier. I will describe it and I wish it will help you.
In the following code (get_categories.php), I am retrieving data from the database and add them to an array. Then return it by encoding as a JSON.
$sql = "SELECT category_name FROM category;";
$dataArray = [];
$result = $connection->query($sql);
if ($result) {
while ($row = $result->fetch_assoc()) {
$dataArray[] = $row;
}
echo json_encode($dataArray);
}
Then in my Javascript code, I can get the data as follows.
$.ajax({
url: "/get_categories.php",
type: "GET",
dataType: "json",
success: function (categories) {
for (var i = 0; i < categories.length; i++) {
console.log(categories[i]);
}
},
error: function (jqXHR, textStatus, errorThrown) {
// Error handling code
}
});

Retrieving each variable posted by AJAX

I am storing my checkbox selections in an array then splitting each array and posting them using AJAX so my PHP function can use the posted id/ids to query my MySQL database.
First part of my JavaScript
$('#tbl_list').click(function (event) {
var tbls = new Array();
$("input:checkbox[name='tbl[]']:checked").each(function () {
tbls.push($(this).val());
});
var tbl = tbls.join('|');
alert(tbl);
This first part works as intended, where every time I click a checkbox the value is alerted.
AJAX post
$.ajax({
type: "POST",
url: "index.php",
data: "tbl=" + tbl
});
});
Finally my PHP
function describeTables() {
if (isset ( $_POST ['tbl'] )) {
$tbl = $_POST ['tbl'];
echo $tbl;
}}
I don't get any vlaues of tbl even if I choose just one option. Why is this????
EDIT
My Checkbox
function showTables() {
if (isset ( $_GET ['db'] )) {
$db = $_GET ['db'];
$link = mysqli_connect ( 'localhost', 'root', '', $db );
$qry = "SHOW tables";
$tbl_list = mysqli_query ( $link, $qry );
echo '<ul>';
while ( $row = mysqli_fetch_array ( $tbl_list ) ) {
echo '<input type="checkbox" name="tbl[]" class="tbl_list" value="' . $row [0] . '" class="tablebox" />';
echo $row [0];
echo '<br>';
}
}
}
showTables ();
SECOND EDIT
After suggestions I have amended my code but now have a new problem where the page doesn't load #dbdisplay Below is my full JS code
if (!location.search.match(/db=[^&#]+/i)) {
$("#dbdisplay").show();
} else {
$("#qryDisplay").show();
}
$(document).on("change", ".checkbox", function () {
var db = $(this).val();
window.sessionStorage.setItem("db", db);
window.location.assign("index.php?db=" + db);
$("#dbdisplay").hide();
});
$('#tbl_list').click(function (event) {
var tbls = new Array();
$("input:checkbox[name='tbl[]']:checked").each(function () {
tbls.push($(this).val());
});
var tbl = tbls.join('|');
//alert(tbl);
$.ajax({
type: "POST",
url: "index.php",
data: {'tbl': tbl }
});
});
The old function
/*
$(document).on("change", ".tablebox", function () {
var tbls = new Array();
$("input:checkbox[name='tbl[]']:checked").each(function () {
tbls.push($(this).val());
});
var tbl = tbls.join('|');
var yourDB = window.sessionStorage.getItem("db");
window.location.assign("index.php?db=" + yourDB + '&tbl=' + tbl);
});
*/
How do I fix this??

In ajax call, data has to be object data: {'tbl': tbl}

This should to the job
$.ajax({
type: "POST",
url: "someurl",
data: {"tbl=" + tbl}
});
http://api.jquery.com/jquery.getjson/
See here for documentation

First thing in your ajax call, data has to be object
data: {'tbl': tbl}
Secondly Ajax can't call php function directly
so your index.php file should be something like this without function
if (isset ( $_POST ['tbl'] )) {
$tbl = $_POST ['tbl'];
echo $tbl;
}

You should use "{ }" with data
$.ajax({
type: "POST",
url: "index.php",
data: {'tbl' : tbl}
});
or
$.ajax({
type: "POST",
url: "index.php&tbl="+tbl
});

php script echo displays in console instead of text inputs

I have this php script:
<?php
add_action('wp_ajax_nopriv_getuser', 'getuser');
add_action('wp_ajax_getuser', 'getuser');
function getuser($str)
{
global $wpdb;
if(!wp_verify_nonce($_REQUEST['_nonce'], 'ajax-nonce'))
{
die('Not authorised!');
}
$myoption = get_option( 'fixformdata_options' );
$myoptionValue = maybe_unserialize( $myoption );
$result2 = $wpdb->get_row
(
$wpdb->prepare
(
"SELECT * FROM {$myoptionValue[tablename]} WHERE personeelsNummer = %s", 1
)
);
if($result2)
{
echo json_encode( $result2 );
}
}
And this javascript file:
jQuery(document).ready(function($){
jQuery('#input_1_2').change(function()
{
jQuery.ajax({
type : 'post',
dataType : 'json',
_nonce : myAjax.ajaxurl,
url : myAjax.ajaxurl,
data : {action: 'getuser', value: this.value},
succes: function(response){
var parsed = JSON.parse(response);
var arr = [];
for(var x in parsed){ arr.push(parsed[x]);}
jQuery('#input_1_3').val(arr[1]);
jQuery('#input_1_4').val(arr[2]);
}
});
});
});
Purpose of the scripts:
When a text inputs change, use the value of this text input to display some database data in another text input.
Now I have 2 problems:
I can't get the value of the text input to the function getuser()
When I hardcode a value in the sql statement, I get the results, but they display in the console instead of using:
.
success: function(response){
var parsed = JSON.parse(response);
var arr = [];
for(var x in parsed){ arr.push(parsed[x]);}
jQuery('#input_1_3').val(arr[1]);
jQuery('#input_1_4').val(arr[2]);
}
How can I resolve this, I'm new in Wordpress and Ajax.

By the looks of your php _nonce should be inside data. You cant use this.value as this is the jQuery ajax function itself so Try:
jQuery('#input_1_2').change(function()
$value = $(this).val();
jQuery.ajax({
type : 'post',
dataType : 'json',
url : myAjax.ajaxurl,
data : {
action: 'getuser',
value: $value,
_nonce : myAjax.ajaxurl
},
succes: function(response){
var parsed = JSON.parse(response);
var arr = [];
for(var x in parsed){ arr.push(parsed[x]);}
jQuery('#input_1_3').val(arr[1]);
jQuery('#input_1_4').val(arr[2]);
}
});
});
In the php you will find value in
$_POST['value'];
Edit
inside the php add
header('content-type:application/json');
before
echo json_encode( $result2 );
on the js you shoud then not need
JSON.parse(response)
you shoud have the results in the array, ie:
response[0]
etc

$.parseJSON Unexpected Character

I'm trying to send data from an html data attribute on a span element and receive it with Ajax and then process it with php and mysql and return the new value to my data attribute in html, but I'm getting a error that says "$.parseJSON unexpected character", can someone please look over my code to see if I'm processing the data correctly as I'm new to working with JSON.
HTML / PHP
<span data-object=
'{"art_id":"<?php echo $row['art_id'];?>",
"art_featured":"<?php echo $row['art_featured'];?>"}'
class="icon-small star-color"></span>
<!-- art_id and art_featured are both int and art_featured will be either 1 or 0 -->
jQuery / Ajax
$("span[class*='star']").on('click', function () {
var data = $.parseJSON($(this).data('object'));
var $this = $(this);
$.ajax({
type: "POST",
url : "ajax-feature.php",
data: {art_id: data.art_id,art_featured: data.art_featured}
}).done(function(result) {
data.art_featured = result;
$this.data('object', JSON.stringify( data ));
});
});
PHP / mySQL
if($_POST['art_featured']==1) {
$sql_articles = "UPDATE `app_articles` SET `art_featured` = 0 WHERE `art_id` =".$_POST['art_id'];
$result = array('art_id' => $_POST['art_id'], 'art_featured' => 0);
echo json_encode($result);
}
else if($_POST['art_featured']==0){
$sql_articles = "UPDATE `app_articles` SET `art_featured` = 1 WHERE `art_id` =".$_POST['art_id'];
$result = array('art_id' => $_POST['art_id'], 'art_featured' => 1);
echo json_encode($result);
}
if(query($sql_articles)) {
}
else {
}

You don't need to use $.parseJSON, jQuery does that for you.
$("span[class*='star']").on('click', function () {
var data = $(this).data('object');
var $this = $(this);
$.ajax({
type: "POST",
url : "ajax-feature.php",
data: {art_id: data.art_id,art_featured: data.art_featured}
}).done(function(result) {
data.art_featured = result;
$this.data('object', data);
});
});
You also don't need to stringify it later.