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setInterval making async ajax function stop working

The problem is that only my first updateProgress function runs while syncDNS is waiting. All other calls made through setInterval keep waiting until syncDNS is finished. Why is that?
$("#syncDNS").click(function() {
$('#status').html("");
$('#status').addClass('loading');
function updateProgress() {
$.ajax({
type: 'POST',
url: 'index.php?action=checkProgress',
datatype: 'text',
async: 'true',
success: function(data) {
$('#status').html(data);
}
});
}
$.ajax({
url: 'index.php?action=sync',
async: 'true',
success: function(response) {
clearInterval(loop);
$('#status').removeClass('loading');
if (response) {
$('#status').addClass('alert alert-warning').html("<h4>Aviso</h4>" + response);
} else {
$('#status').addClass('alert alert-success').html("<h4>Sucesso</h4>" + "DNS sincronizado com sucesso!");
}
}
});
updateProgress();
var loop = setInterval(function() {
updateProgress();
}, 1000);
});

Remove clearInterval(loop); then it will work again and again.
$.ajax({
url: 'index.php?action=sync',
async: 'true',
success: function(response) {
//clearInterval(loop);
$('#status').removeClass('loading');
if (response) {
$('#status').addClass('alert alert-warning').html("<h4>Aviso</h4>" + response);
} else {
$('#status').addClass('alert alert-success').html("<h4>Sucesso</h4>" + "DNS
sincronizado com sucesso!");
}
}
});

how to wait load() complete and get variable in selector

my problem to get text in td after .load(url) to variable
load code
$("#tr1").load("include/test.php?page=1");
and code for get variable in .load(include/test.php?page=1)
i can not getid
run before complete load
$(window).bind('load', function () {
var getid = $("td:first").text();
function updatenewrow(getid) {
$.ajax({
type: "POST",
url: 'test1.php',
data: {id: getid},//only input
success: function (response) {
if (response > getid) {
$("#tr1").load("include/test.php?page=1");
}
}
});
}
//setInterval(updatenewrow(getid), 4000);
});

It's not clear what you are trying to accomplish the way you have posed the question.
Maybe this is what you're looking for:
function updatenewrow(getid) {
$.ajax({
type: "POST",
url: 'test1.php',
data: { id: getid },
success: function (response) {
if (response > getid) {
$("#tr1").load("include/test.php?page=1");
}
}
});
}
$("#tr1").load("include/test.php?page=1", function(response, status, xhr){
if(xhr.status == 200){
var getid = $("td:first", this).text();
updatenewrow(getid);
}
});
Hope that helps.

How to change url of ajax function depending the return value of beforesend() function?

I want to run a function inside beforesend() in jquery ajax. Depending on the return value of that function I want to change the URL of ajax request. For an example refer below.
If myFunction() returns a value grater than 1, I want to run url1 otherwise I want to run url2. How to achieve that?
myFunction() gives a value grater than 1. But always ajax runs the url2.
$.ajax({
type: "POST",
data: {
fname: $('#com').val()
},
dataType: "json",
beforeSend: function () {
myFunction($('#com').val())
},
url: (myFunction($('#com').val()) > 1) ? url1 : url2,
success: function (data) {
if (data == 'success') {
window.location.href = 'index.php?r=site/index';
} else {
alert("Already registered email");
}
},
failure: function (errMsg) {
alert(errMsg);
}
});

try this
$.ajaxSetup({
beforeSend: function(jqXHR, settings) {
settings.url ="new Url";
}
});

Create a global variable something like:
var urlToSend;
and then assign it in beforeSend
$.ajax({
type: "POST",
data: {
fname: $('#com').val()
},
dataType: "json",
beforeSend: function () {
urlToSend=myFunction($('#com').val()) > 1 ? url1 : url2;
},
url: urlToSend,
success: function (data) {
if (data == 'success') {
window.location.href = 'index.php?r=site/index';
} else {
alert("Already registered email");
}
},
failure: function (errMsg) {
alert(errMsg);
}
});

$.ajax({
type: "POST",
data: {
fname: $('#com').val()
},
dataType: "json",
beforeSend: function () {
url = myFunction(parseInt($('#com').val())) > 1 ? url1 : url2;
},
url: url,
success: function (data) {
if (data == 'success') {
window.location.href = 'index.php?r=site/index';
} else {
alert("Already registered email");
}
},
failure: function (errMsg) {
alert(errMsg);
}
});

While ajax, async:true,deferred

3 hours i cant resolve the problem and found solution in internet. Some one please help me.
How i can create loop of ajax requests, while the data from ajax not equally "stop" using while and async:true?
This is not work example:
do {
promise = json('json.php');
promise.success(function again(data) {
if(data === 'stop') {
return false;
} else {
console.log('data');
}
});
} while (again());
function json(url) {
return $.ajax({
type: "GET",
dataType: 'text',
url: url
});
}

function again(data) {
if (data !== 'stop') {
alert(data);
sendReq();
}
}
function sendReq() {
json(location.href).success(again);
}
function json(url) {
return $.ajax({
type: 'GET',
dataType: 'text',
url: url
});
}
sendReq();

ajax call not working with in ajax

I using the mvc controller with ajax. I perfom the task using the jquery confirm box. when i click the "ok" button its needs to the call another ajax and its link to the another controller but its not working
Sample code:
function button_click() {
$.ajax({
type: 'POST',
url: 'url',
data: {data},
dataType: 'json',
success: function (data) {
if (data.success == true) { call(data); }
else { alert(data.data); }
}
});
}
function call(data)
{
var ans = confirm(data)
if(ans)
{
$.ajax({
type: 'POST',
url: '#(Url.Action("StudentList", new { Area = "Mec", Controller = "HOD" }))',, // this url not goes to the controller
data: {data},
dataType: 'json',
success: function (data) {
if (data.success == true) { alert(data.data); }
else { }
}
});
} else { }
}

i have tried your code but it worked for me.the difference is that
you need to pass data in correct format. data:data or data:{ data:data } but not data:{data}
function button_click() {
$.ajax({
type: 'POST',
url: 'Demo/Demo_action',
data: { data: "what you want to pass" },
//dataType: 'json',
//contentType: 'application/json',
success: function (data) {
if (data == "hello") {
call(data);
}
}
});
}
function call(data) {
var ans = confirm(data)
if (ans) {
$.ajax({
type: 'POST',
url: '#(Url.Action("Demo_action2", new { Area = "Mec", Controller = "Home" }))',
//url: 'Home/Demo_action2', // this url not goes to the controller
data: { data: data },
dataType: 'json',
success: function (data) {
alert(data);
}
});
}
else
{ }
}