Develop Reference

Sending AJAX post request to PHP

So here is my AJAX code using JQuery:
$('#button-upload').on('click', function(){
if( sendSMSArr.length > 0 ){
$.ajax({
url: 'manager/smsendr4.php',
type: 'POST',
dataType: 'json',
data: {'distribution': sendSMSArr},
success: function(response){
}
});
}
});
The request isn't registered in the network.
Secondly, I'm not sure how can I collect this data with PHP using $_POST.

You seem to be a php newbie. Here is a snippet of code you can use to retrive the ajax data.
Here is the link to the documentation about the global variable $_POST I suggest you to read it.
Another useful link about the predefined variables in php
JS code:
$('#button-upload').on('click', function(event){
event.preventDefault();
if( sendSMSArr.length > 0 ){
$.ajax({
url: 'manager/smsendr4.php',
type: 'POST',
dataType: 'json',
data: {'distribution': sendSMSArr},
success: function(response){
console.log(response);
}
});
}
});
PHP:
<?php
if(isset($_POST['distribution'])){
# I've added a sanitization filter, but you can omit it if you don't need to pass the data to a database.
$dist = filter_var($_POST['distribution'], FILTER_SANITIZE_STRING);
# put your logics here after you got the distribution $_POST variable value.
}
?>

Reading data from JSON reply with JQuery

I've been having trouble accessing this piece of content in a json object. Here is my code for fetching data:
function getEntries(key){
$.ajax({
url: "https://openlibrary.org/api/books?bibkeys=ISBN:" + key + "&jscmd=details&callback=mycallback",
dataType: "jsonp",
success: function(data){
console.log(data);
}
});
}
The reply I get looks like this:
How do I access the pointed object if the key is different for every search?

Try using
data["ISBN:"+key]
Where key is the key you are passing to the function

I think I found it after all...
function getEntries(key){
$.ajax({
url: "https://openlibrary.org/api/books?bibkeys=ISBN:" + key + "&jscmd=details&callback=mycallback",
dataType: "jsonp",
success: function(data){
console.log(data["ISBN:"+key]);
}
});
}
did the trick.

Ajax inside Ajax somehow strange behaviour

I have a Ajax-Call inside a Ajax-Call, everything "seems" to work fine. In console I can see, both calls are executed and get a return.
But somehow, i can't use the returned result from the second call(?)
$.ajax({
type: "POST",
url: "register/checkEmail/"+email,
success: function(result){
if(result == "TRUE") {
$('#regMsg').html('Ein User mit dieser Email ist bereits registriert!');
$('#regMsg').slideDown();
// NO ERROR - REGISTER USER
} else {
$('#regMsg').slideUp();
var inputs = $('#regForm :input').serializeArray();
alert('ok');
$.ajax({
method: "POST",
url: "register/save",
data: inputs,
dataType: 'json',
success: function(result){
alert('ddok');
}
});
}
}
});
the first alert() is beeing displayed, the secont is not, although the second call is executed correctly(?) why is that?

Simple - the second call's response did not return back to the ajax i.e error/fail.
Add the error handling part after success to find the response.
After success add
,error: function(result){
alert('error');
console.log(result);
}
If this is not the reason, then dataType: 'json', should be the culprit as your response wouldn't be in json format !!

Parsing JSON Objects in JavaScript

I have php on my server that is handling the AJAX call and returning a JSON object like so:
$dataArray = array('order_id'=>$order_id, 'response'=>'Sucessfully Added');
header('Content-type: application/json');
echo json_encode( $dataArray );
This is my AJAX call:
$('.add').ajaxForm({url: this.href, type:'post',
data: this.serialize,
dataType: 'json',
success: function(responseText){
var p = JSON.parse(responseText);
alert(p.response);
$('.popupContainer').hide();
}
});
In FireBug I can see that it reaches the line that begins with 'var p' just fine. In fact, at this point, FB tells me that the responseText is exactly what I want it to be: {"order_id":"182","response":"Sucessfully Added"}. But at that point it suddenly stops, so I must be missing something here.

There is no need to do manual parsing, since the dataType is set as json the response will be automatically parsed
$('.add').ajaxForm({
url: this.href,
type: 'post',
data: this.serialize,
dataType: 'json',
success: function (p) {
alert(p.response);
$('.popupContainer').hide();
}
});
jQuery Form
dataType
'json': if dataType == 'json' the server response will be evaluted and
passed to the 'success' callback, if specified
success
responseText or responseXML value (depending on the value of the
dataType option).

PHP: How to get non-form data from ajax

I'm trying to get data from a user interface to PHP.
In JS, I have:
var myPostData=JSON.stringify({'categoria':valor,'fluxo':fluxo});
$.ajax({
url:'data.php',
type:'post',
data:myPostData,
dataType: "json",
});
Where valor and fluxo are variables.
And in PHP:
if (isset($_POST['categoria'])){
$fluxo=$_POST['fluxo'];
$categoria=$_POST['categoria'];
echo("Fluxo ".$fluxo);
echo("categoria ".$categoria);
}else{
echo "nada";
}
But I can't get the data to be processed by PHP. I always get 'nada' in return...
Thanks in advance for any help!

Instead of transforming the data to a JSON string, just add it as a plain Javascript object:
var myPostData={'categoria':valor,'fluxo':fluxo};
$.ajax({
url:'data.php',
type:'post',
data:myPostData,
dataType: "json",
});
Also as pointed out in comments, you are accessing the POST variable by $_POST['valor'], when you are sending it as $_POST['categoria'].