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Verification with ajax call

I know it has been answered but since Im ignorant with javascript and ajax, need help. I had found a code for crud operations. My problem is that html verification is not working. When the modal submits the form the required fields in html cannot block the form operation not to be submited. Can anyone help with the script? Here is the code for all operations:
$(document).on('click','#btn-add',function(e) {
var data = $("#user_form").serialize();
$.ajax({
data: data,
type: "post",
url: "save.php",
success: function(dataResult){
var dataResult = JSON.parse(dataResult);
if(dataResult.statusCode==200){
$('#modal_task').modal('hide');
alert('Η εργασία καταχωρήθηκε με επιτυχία!');
window.location.reload(true);
}
else if(dataResult.statusCode==201){
alert(dataResult);
}
}
});
});
$(document).on('click','.update',function(e) {
var id=$(this).attr("data-id");
var name=$(this).attr("data-name");
var email=$(this).attr("data-email");
var phone=$(this).attr("data-phone");
var city=$(this).attr("data-city");
$('#id_u').val(id);
$('#name_u').val(name);
$('#email_u').val(email);
$('#phone_u').val(phone);
$('#city_u').val(city);
});
$(document).on('click','#update',function(e) {
var data = $("#update_form").serialize();
$.ajax({
data: data,
type: "post",
url: "backend/save.php",
success: function(dataResult){
var dataResult = JSON.parse(dataResult);
if(dataResult.statusCode==200){
$('#editEmployeeModal').modal('hide');
alert('Data updated successfully !');
location.reload();
}
else if(dataResult.statusCode==201){
alert(dataResult);
}
}
});
});
$(document).on("click", ".delete", function() {
var id=$(this).attr("data-id");
$('#id_d').val(id);
});
$(document).on("click", "#delete", function() {
$.ajax({
url: "backend/save.php",
type: "POST",
cache: false,
data:{
type:3,
id: $("#id_d").val()
},
success: function(dataResult){
$('#deleteEmployeeModal').modal('hide');
$("#"+dataResult).remove();
}
});
});
$(document).on("click", "#delete_multiple", function() {
var user = [];
$(".user_checkbox:checked").each(function() {
user.push($(this).data('user-id'));
});
if(user.length <=0) {
alert("Please select records.");
}
else {
WRN_PROFILE_DELETE = "Are you sure you want to delete "+(user.length>1?"these":"this")+" row?";
var checked = confirm(WRN_PROFILE_DELETE);
if(checked == true) {
var selected_values = user.join(",");
console.log(selected_values);
$.ajax({
type: "POST",
url: "backend/save.php",
cache:false,
data:{
type: 4,
id : selected_values
},
success: function(response) {
var ids = response.split(",");
for (var i=0; i < ids.length; i++ ) {
$("#"+ids[i]).remove();
}
}
});
}
}
});
$(document).ready(function(){
$('[data-toggle="tooltip"]').tooltip();
var checkbox = $('table tbody input[type="checkbox"]');
$("#selectAll").click(function(){
if(this.checked){
checkbox.each(function(){
this.checked = true;
});
} else{
checkbox.each(function(){
this.checked = false;
});
}
});
checkbox.click(function(){
if(!this.checked){
$("#selectAll").prop("checked", false);
}
});
});

How to update select option datatable laravel for current row or id

i have problem to update selected option .The database can be update ,but it update for all data .i just want to update current row only
javascript :
$(document).ready(function () {
$('#table_refund').on('change' ,'select', function() {
var data= $(this).closest('tr');
var status = $('option:selected',this).val();
alert(status);
$.ajax({
type: "get",
url: "/financial/approve/refund",
data: {status: status },
dataType: "JSON",
success: function (response) {
$('.alert').show();
}
});
});
controller:
public function studentrefund(Request $req)
{
//update table
data = Refund::find($req->userid);
$data->status = $req->status;
$data->save();
return response()->json(['success'=>'Saved successfully.']);
}

You Need to check particular Id and that userID so you get current row.
Controller::
public function studentrefund(Request $req)
{
//update table
$data = Refund::where('id',$req->id)->where('userid',$req->userid)->first();
$data->status = $req->status;
$data->save();
return response()->json(['success'=>'Saved successfully.']);
}

You can Use fundOrFail the findOrFail and firstOrFail methods will retrieve the first result of the query. However, if no result is found, a Illuminate\Database\Eloquent\ModelNotFoundException will be thrown laravel.com/docs/5.1/eloquent#retrieving-single-models
public function studentrefund(Request $req)
{
//validate user id
request()->validate([
'userid' => 'required',
]);
//update table
$data = Refund::findOrFail($req->userid);
$data->status = $req->status;
$data->save();
return response()->json(['success'=>'Saved successfully.']);
}

option :
<select id="table_refund">
<option data-id="{{ $row->id }}" value="Aktive">Test Data</option>
</select>
Jquery :
$(document).ready(function() {
$('#table_refund').on('change', 'select', function() {
var id = $(this).data('id');
var status = $('option:selected', this).val();
$.ajax({
type: "POST",
url: "{{ url('financial/approve/refund') }}",
data: {
"id": id,
"status": status,
},
dataType: "JSON",
success: function(response) {
$('.alert').show();
}
});
});
Controller :
public function studentrefund(Request $request)
{
$data = Refund::findOrFail($request->id);
$data->status = $request->status;
$data->save();
return response()->json(['success'=>'Saved successfully.']);
}

How to access multidimensional associative json arrays from AJAX jquery function

I have to return a return a multidimensional associative arrays from PHP page for a jQuery AJAX function.
This is my PHP page called 'seachsongs.php'
<?php
$brano = $_POST['brano'];
$sql = "SELECT Titolo, Autore FROM Brani WHERE Titolo = '$brano';";
$ris = $conn->query($sql);
while ($row = $ris->fetch_array()) {
$arr[] = $row;
}
echo json_encode(array('data' => $arr));
?>
This is my jQuery AJAX function
$(document).ready(function () {
$('#nBrano').keyup(function () {
nomeBrano = $(this).val();
$.ajax({
type: "POST",
data: {brano: nomeBrano},
url: "searchsong.php",
success: function (data) {
document.write(data);
//alert("Prova" + data['data'][0]["Titolo"]);
/*if (msg != 'null') {
$('#similarSongs').css('display', 'block');
/*$.each(prova, function (key1, value1) {
$.each(value1['two']['three'], function (key1, value1) {
document.write('test');
});
})
$('#similarSongs table').html(tabella);
}
if (msg == 'null') {
$('#similarSongs table').html("Nessun brano simile trovato");
$('#similarSongs').css('display', 'block');
}*/
},
error: function () {
//alert('errore');
}
});
});
});
How can I access to array data from jQuery? What is the correct statement?
alert(data)
print this
{"data":[{"0":"Animals","Titolo":"Animals","1":"Martin Garrix","Autore":"Martin Garrix"},{"0":"Animals","Titolo":"Animals","1":"Maron V","Autore":"Maron V"}]}{"data":[{"0":"Animals","Titolo":"Animals","1":"Martin Garrix","Autore":"Martin Garrix"},{"0":"Animals","Titolo":"Animals","1":"Maron V","Autore":"Maron V"}]}
PS: sorry form my bad english.

I've set the data type of this request to be json, so the response returned should be a json object. You can access it by this way:
$(document).ready(function () {
$('#nBrano').keyup(function () {
nomeBrano = $(this).val();
$.ajax({
type: "POST",
data: {brano: nomeBrano},
url: "searchsong.php",
dataType:'json',
success: function (response) {
for(var i=0; i<response['data'].length; i++){
console.log(response['data'][i][/*your_target_index*/]);
}
},
error: function () {
//alert('errore');
}
});
});
});
see more about ajax

How to send multiple values using ajax to PHP

I'm trying to collect a Facebook user info and then sign them up. How do i include more than one value in ajax?
$.signuser = function () {
FB.api('/me', function (response) {
var str = "";
alert(response.name);
var fbfname = response.first_name;
var fblname = response.last_name;
var fblname = response.id;
var fblink = response.link;
var fbusername = response.username;
var fblink = response.email;
$.ajax({
type: "POST",
data: {
data: fbfname,
fblname
},
complete: function () {
//$('#booksloadjif').css('display','none')
},
url: "fbpost.php"
}).done(function (feedback) {
$('#fg').html(feedback)
});
});
}

You can pass multiple key / value pairs to PHP as an object in $.ajax
$.signuser = function () {
FB.api('/me', function (response) {
var data = { // create object
fbfname : response.first_name,
fblname : response.last_name,
fblname : response.id,
fblink : response.link,
fbusername : response.username,
fblink : response.email
}
$.ajax({
type: "POST",
data: data, // pass as data
url: "fbpost.php"
}).done(function (feedback) {
$('#fg').html(feedback)
}).always(function() {
$('#booksloadjif').css('display','none')
});
});
}
and you'd access them in PHP with
$_POST['fbfname']
$_POST['fblname']
etc, i.e. the keynames in javascript are also the key names for the $_POST array

Ajax call not succeeding after function call

I am attempting to load dynamic data based on the specific URI segment thats on the page.
Heres my Javascript:
$(document).ready(function() {
$(function() {
load_custom_topics();
});
$('#topics_form').submit(function() {
var topic = document.getElementById('topics_filter').value
$.ajax({
type: "POST",
url: 'ajax/update_session_topic',
dataType: 'json',
data: { topic: topic },
success: function(){
load_custom_topics()
}
});
return false;
});
function load_custom_topics(){
$.ajax({
type: "POST",
url: 'ajax/load_custom_topics',
dataType: 'json',
data: {},
success: function (html) {
$('div.topics_filter').html(html['content']);
get_threads();
}
});
}
function get_threads(){
var page = document.getElementById('page').value
$.ajax({
type: "POST",
url: 'ajax/get_threads',
dataType: 'json',
data: {page: page},
success: function (html) {
$('div#thread_list').html(html['content']);
}
});
}
});
So, as you can see, on page load, it kicks off load_custom_topics which runs just fine. Its then supposed to call get_threads(). This is where the thing stops, and I get no data.
Get_threads()
public function get_threads()
{
$session = $this->session->userdata('active_topic');
if ($this->input->post('page') == '1')
{
$data['list'] = $this->right_model->thread_list_all();
$data['test'] = "all";
} else {
$data['list'] = $this->right_model->thread_list_other($session);
$data['test'] = "not all";
}
if ($data['list'] == FALSE)
{
$content = "no hits";
} else {
$content = $this->load->view('right/thread_list', $data, TRUE);
}
$data['content'] = $content;
$this->output->set_content_type('application/json')->set_output(json_encode($data));
}
While I create the 'page' dynamically, the HTML outputs to this:
<div name="page" value="1"></div>
Any reason why get_threads() is not running?

This does not have an ID. It has a name.
<div name="page" value="1"></div>
This means that your request for getElementById is failing. So this line of code should be showing a TypeError in your console.
var page = document.getElementById('page').value