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Ajax can't send data to php as json without error

When I want to send data as datatype json it response this error:
SyntaxError: Unexpected token < in JSON at position 0
When I tried to send the data as datatype text, it sends the data to php successfully but my php wont respond.
ajax/js as datatype json:
let form = $("#form");
$("#form").on("submit", function(e) {
e.preventDefault();
$.ajax({
url: "test.php",
method: "POST",
dataType: "json",
data: {
test: 1
},
success: function (r) {
console.log("!!!");
},
error: function(jqXHR, textStatus, errorMessage) {
console.log(errorMessage);
}
});
});
ajax/js as datatype normal:
let form = $("#form");
$("#form").on("submit", function(e) {
e.preventDefault();
$.ajax({
url: "test.php",
method: "POST",
data: form.serialize(),
success: function (r) {
console.log("!!!");
},
error: function(jqXHR, textStatus, errorMessage) {
console.log(errorMessage);
}
});
});
php code:
if(isset($_POST["test"])){
echo "<script>console.log('works');</script>";
}

Try this
var ob = {
test: 1
};
$.ajax({
url: "test.php",
method: "POST",
dataType: "json",
contentType: 'application/json',
data:JSON.stringify(ob),
success: function (r) {
console.log("!!!");
},
error: function(jqXHR, textStatus, errorMessage) {
console.log(errorMessage);
}
});

how to execute a javascript function returned from ajax response

I have a function which i want to execute when ajax makes a successful request but it doesn't execute here my jquery part
$.ajax({
type: "POST",
url: "https://www.example.com/create_chat.php",
data: dataString,
beforeSend: function()
{
$("#loading_indicator").show();
},
success: function(response)
{
$(".example").html(response);
}
});
here is the response from php file
<script>start_chat(); alert("testing");</script>
i tried adding this also
$(".example").find("script").each(function(i) {
eval($(this).text());
});
but nothing works

Your response from create_chat could indicate which function will be used. For example
$.ajax({
type: "POST",
url: "https://www.example.com/create_chat.php",
data: {
dataString: dataString
},
beforeSend: function()
{
$("#loading_indicator").show();
},
success: function(response) // response could be 1,2,3,4.. etc
{
if(response==1) {
start_chat();
}
if(response==2) {
stop_chat();
}
if(response==3) {
change_chat_room();
}
...
$(".example").html(response);
}
});

While there are work arounds, you should never be executing the response of an Ajax call directly.
"Scripts in the resulting document tree will not be executed,
resources referenced will not be loaded and no associated XSLT will be
applied."
http://www.w3.org/TR/XMLHttpRequest/#document-response-entity-body
Best practice is to respond with data, typically in the form of JSON, JSONP or HTML.

Try This,
$.ajax({
type: "POST",
data: {
'dataString': dataString
},
url: 'https://www.example.com/create_chat.php',
success: function(data) {
start_chat();
alert('Success');
},
error: function(data) {
alert('failed');
}
});

Ajax call to database not works

in my application I have to make an ajax call to php file.it works proper in all devices. but when I tried it on ipad mini it not calls the php, so that the functionality not works, I've seen so many question about this problem and edited my code like this.
jQuery.ajax({
type: "POST",
async: true,
cache: false,
url: "directory/phpfile.php",
data: data,
success: function(response) {
}
});
my old code is
jQuery.ajax({
type: "POST",
url: "wp-admin/admin-ajax.php",
data: data,
success: function(response) {
}
});
and the problem still cant resolve . so please any one tell me how to resolve this.

Please use this code
$("#ajaxform").submit(function(e)
{
var postData = $(this).serializeArray();
var formURL = $(this).attr("action");
$.ajax(
{
url : formURL,
type: "POST",
data : postData,
success:function(data, textStatus, jqXHR)
{
//data: return data from server
},
error: function(jqXHR, textStatus, errorThrown)
{
//if fails
}
});
e.preventDefault(); //STOP default action
e.unbind(); //unbind. to stop multiple form submit.
});
$("#ajaxform").submit(); //Submit the FORM

<script type='text/javascript'>
$(document).ready(function startAjax() {
$.ajax({
type: "POST",
url: "test.php",
data: "name=name&location=location",
success: function(msg){
alert( "Data Saved: " + msg );
}
});
});

AJAX success call back not working

Here is the code I am using to access my web API controller named Owner; the success function is not being called. Any ideas?
$.ajax({
type: "GET",
url: 'http://localhost:26533/api/Owner',
contentType: "application/json",
dataType: "jsonp",
success: function (response) { alert("yes"); }
});

Remove the contentType and dataType and check the response..
Here an example:
$.ajax({
type: 'GET',
url: 'http://localhost:26533/api/Owner',
success: function(data){
alert(data);
},
error: function(xhr, type, exception) {
// if ajax fails display error alert
alert("ajax error response type " + type);
}
});
With this you can see what's wrong...

Ajax Get Request with JQuery Error

I'm trying to call a php script with a get request and using the data theaddress however the results are showing me the source of the page im calling.
The page im calling is here
Here is my ajax function that will get this page
$( document ).ready(function() {
var address = document.getElementById("address");
$.ajax({
url: '/r10database/checkSystem/ManorWPG.php',
type: 'GET',
data: 'theaddress='+address.value,
cache: false,
success: function(output)
{
alert('success, server says '+output);
}, error: function()
{
alert('Something went wrong, saving system failed');
}
});
});

$( document ).ready(function() {
var address = document.getElementById("address");
$.ajax({
url: '/r10database/checkSystem/ManorWPG.php',
type: 'GET',
data: 'theaddress='+address.value,
cache: false,
success: function(output)
{
alert('success, server says '+output);
}, error: function(error)
{
alert (error); // this is the change from the question
}
});
});

Put the dataType as json with a curly brace
data: {theaddress:address.value},
dataType:'json',
success: function(output)
{
alert('success, server says '+output);
}, error: function(xhr)
{
alert (xhr.status);
}
and get the data in ManorWPG.php as $_GET['theaddress']
** share the xhr.status if failed.