Develop Reference

Ajax doesn't get to success function. Always error function. It fails to post data to another file

Please be patient. This is my first post as far as I remember.
This is a part of my calendar.js script. I'm trying to POST data that I fetch from modal window in index.php to sql.php.
function saveModal() { /*JQuery*/
var current_date_range = $(".modal-select#daterange").val();
var current_room_number = $("#mod-current-room-number").val();
var current_room_state = $("#mod-current-room-state").val();
var myData = {"post_date_range": current_date_range, "post_room_number": current_room_number, "post_room_state": current_room_state};
var myJSON = JSON.stringify(myData);
$.ajax({
type: "POST",
url: "sql.php",
contentType: "application/json; charset=utf-8",
dataType: "json",
async: true,
data: myJSON,
beforeSend: function() {
$("#ajax").html("<div class='loading'><img src='/images/loader.gif' alt='Loading...' /></div>");
},
success: function(result){
$("#ajax").empty();
$("#ajax").html(result);
$("#ajax").fadeIn("slow");
window.location.reload(true);
},
error: function(){
alert(myJSON);
$("#ajax").html("<p class='error'> <strong>Oops!</strong> Try that again in a few moments.</p>");
}
})
}
I get the data just fine (as you can see I have checked in the error: function() with alert(myJSON);). It looks like this: {"post_date_range":"12/19/2018 - 12/28/2018","post_room_number":"118","post_room_state":"3"}. Nevermind that the daterangepicker.js returns dates in the hideous MM/DD/YYYY format, which I would very much like to change to YYYY-MM-DD. The real problem is, the code never gets to success: function().
Now my sql.php is in the same folder as calendar.js and index.php.
In sql.php I try to retrieve those values with:
$currentDateRange = $_REQUEST['post_date_range'];
$currentRoomNumber = intval($_REQUEST['post_room_number']);
$currentRoomState = intval($_REQUEST['post_room_state']);
I have checked many other SO Q&As and none have helped me solve my problem. I don't see any spelling errors. It's not disobeying same origin policy rule. I don't want to use jQuery $.post function. Anyone sees the obvious solution?

You want to send array in post rather than the string so directly send myData to get array value in your PHP file rather converting to JSON string It would work with your current PHP file as you require.

You should specify a POST key for the JSON data string you are sending:
var myJSON = JSON.stringify(myData);
(...)
$.ajax({
(...)
data: 'data=' + myJSON,
You need to parse (decode) this string in your PHP file to be able to use it as an array/object again:
$data = json_decode($_REQUEST['data']);
$currentDateRange = $data['post_date_range'];
$currentRoomNumber = intval($data['post_room_number']);
$currentRoomState = intval($data['post_room_state']);
Also, dataType in jQuery.ajax function is specified as "The type of data that you're expecting back from the server." according to jQuery documentation. As far as I can tell from your code, you might rather expect something else as your response, so try excluding this line.

I am sorry to have burdened you all. It's my third week programming so my lack of knowledge is at fault.
I did not know how dataflow works between AJAX and PHP in the URL...
While I was searching for other errors, I printed or echoed out many different things. The PHP file should echo only 1 thing, although it can be an array with multiple values.
Like this for example:
$return_arr = array("sql"=>$sql1, "result"=>$result, "out"=>$out);
echo json_encode($return_arr);
I appologize again.

change the Json in the JavaScript

I have to get data from Restful API and I want to show in the HTML by JavaScript, I have to get the data as follows:
function loadInfo(){
$http({
method:'GET',
url:'https://happy_ending/restful_api/propertyviewset/?format=json',
dataType: "json",
contentType : 'application/json',
}).then(function (json){
// on success
var a = JSON.stringify(json);
console.log(a);
console.log(a['data']);
}, function (json){
alert('No');
})
}
At first, I get the data with some Messy coding, and then I add the code var a = JSON.stringify(json); and the Messy coding is gone, I know I have to change the JSON object to JSON string.
the data structure is shown in the image
Then I want to get the data according to the following ways.Unfortunately, they are both the wrong "undefined"
1.console.log(a['data']); 2.console.log(a.data);
I have two questions :
Q1: I have set the format =json,so I just want to get the data, but In the picture，you can see, the other variables: "status","contentType","headers","dataType", I want to ignore it, what can I set?
Q2: how can I get the value of "id" in the data? I think the above two ways are both wrongs!
Thanks in advance ~ any help is appreciated

Datatable.js + POSTing data PHP

I'm trying to setup my datatable to POST to the contents of it's rows into my PHP script so that I can store it in a database.
I have a working HTML page, which when I click "+ Add Mapping" a BS modal appears and I can add a row to the datatable.
<script>
$(document).ready(function() {
var t = $('#parameters_config').DataTable();
$('#add_new_mapping').on('click', function() {
$('#add_field_mapping').modal('hide');
var wb_field = $("#add_field_mapping #wb_field").val();
var adobe_field = $("#add_field_mapping #adobe_field").val();
t.row.add([
adobe_field,
wb_field,
]).draw();
$('#add_new_field_mapping').trigger("reset");
});
});
</script>
This all works perfectly. I now would like to retrieve all data rows and POST them to my script so that I can process the submitted data and store. So far, I've come up with this based on information provided:
<script>
$(document).ready(function() {
$('#parameters').submit(function(event) {
var table = $('#parameters_config').DataTable();
var dataToSend = table
.rows()
.data();
console.log( 'Data', dataToSend);
alert( 'There are '+dataToSend.length+' row(s) of data in this table');
$.ajax({
type: 'POST',
url: '{$this->homeURL}',
data: dataToSend,
dataType: 'json',
});
});
});
</script>
In my console window I see the following returned for "dataToSend" but no actual data!
[Array[2], context: Array[1], selector: Object, ajax: Object]
Where am I going wrong?

Where the examples went wrong
The two examples you linked in your post aren't really related to what you're trying to do (from what I can gather about your goal).
The first example is about how to obtain data from the server with a POST instead of the default GET, and has nothing to do with sending data to the server for some purpose.
The second example is about serverside processing, which is where you have pagination, ordering, sorting, filtering, and all other DataTables features handled in your own server code where you then send the results to the client (which is pretty complicated and unless you have a huge number of rows, unnecessary).
Therefore, remove serverSide: true!
Your Goal
What you actually want to do (I think) is send your data to a php script so that you can do something with it. This is not handled by any DataTables API call, but is a fairly simple feature to implement. All you really need is a function that will make an AJAX call that will send the data to the script.
Solution
The way you can do this is by obtaining the data with the t.data() API call, and then sending it with an ajax request. It might look like this:
function sendData(){
var dataToSend = t.data();
$.ajax({
type: 'POST',
url: 'URL OF SCRIPT HERE',
data: dataToSend
});
}
Then you simply have to call sendData() whenever it is that you want to send the data. Of course, you'll have to ensure that your controller handles the data correctly, but that's a different matter entirely.

Ajax request, fetch JS array and make it available

I'm trying to fetch a JS array created by a PHP file and re-use the JS array in a JS script in the page. I have tried many different solutions found on this site but none seems to work but I don't know what the issue is with my script.
I have a PHP file that echoes the following:
[["content11", "content12", "content13", "content14","content15"],
["content21", "content22", "content23", "content24","content25"]]
I'm using a simple Ajax get to retrieve the data:
$.ajax({
type: "GET",
url: myUrlToPhpFile,
dataType: "html",
success : function(data)
{
result = data;
alert (result);
}
});
The alert displays the expected output from the PHP file but if I now try to access the array like result[0], it outputs "[" which is the first character. It looks like JS sees the output as a string rather than an array.
Is there something I should do to make JS understand it's a JS array?
I have seen many solution with JSON arrays but before going into this direction, I'd like to check if there are simple solutions with JS arrays (this would prevent me from rewriting too much code)
Thanks
Laurent

In you php file you need check that your arrays echos with json_encode.
echo json_encode($arr);
And in your javascript file:
$.ajax({
type: "GET",
url: myUrlToPhpFile,
dataType: "html", // json
success : function(data)
{
var res = JSON.parse(html);
alert(html); // show raw data
alert(res); // show parsed JSON
}
});

You can use JSON.parse to format the string back into an array.
JSON.parse(result)[0]
or
var result = JSON.parse(result);
result[0];

#Rho's answer should work fine, but it appears that you're using jQuery for your AJAX call, which gives you a shortcut; you can use $.getJSON instead of $.ajax, and it will read the data as JSON and provide you with the array immediately.
$.getJSON(myUrlToPhpFile, function(result) { ... });
This is really just a short way of writing what you already have, but with a dataType of json instead of html, so you could even do it that way if you prefer. This is all assuming that you're using jQuery of course, but your code was following their API so it seems a good bet that you're either using jQuery or something compatible.

passing json array ajax

Trying to pass a array using ajax call.
info = [];
info[0] = 'hi';
info[1] = 'hello';
$.ajax({
type: "POST",
data: {info: info, "action": "getPatientRecords"},
url: "/mobiledoc/jsp/ccmr/webPortal/carePlanning/servicePatientmilestoneModal.jsp",
success: function(msg) {
$('.answer').html(msg);
}
});
However when i try to catch it on the server side using :
request.getParameter("info"); //Displays null**
Also, if i wish to send an array of arrays ? is it possible?
I tried using serialize however my IE throws error that serialize : object doesnt support this property i Did include jquery lib.

You can use JSON.stringify(info) to create a JSON representation of the object/array (including an array of arrays). On the server side you should be able to get the string via getParameter and then unserialize it from JSON to create constructs JSP can use.

Yes,It is Possible to send arrays.
var info_to_send = ['hi','hello'];
$.ajax({
type: "POST",
data: {info: info_to_send, "action": "getPatientRecords"},
url: "/mobiledoc/jsp/ccmr/webPortal/carePlanning/servicePatientmilestoneModal.jsp",
success: function(msg) {
$('.answer').html(msg);
}
});

You can only provide strings in a request url.
You could encode the array like so:
info = JSON.stringify(info);
// results in "['hi', 'hello']"
Then send it to the server, also JSON parse on the server.
You will need to go to http://www.json.org/ to get a Java implementation of JSON parsing.