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Unable to show the response in alert or console

I'm working on a website in which I need to make a GET request to a webservice and log the response. I'm trying the below code in jsp.
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
var a = this.responseText;
alert(a);
console.log(a);
}
...
xhttp.open("GET", "https://example.com/test.ashx", true);
xhttp.send();
I am able to see the response in Firefox networks tab. But alert/console log doesn't work. What am I doing wrong here?

try this
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (xhttp.readyState == XMLHttpRequest.DONE) {
var a = this.responseText;
alert(a);
console.log(a);
}
}
xhttp.open("GET", "https://example.com/test.ashx", true);
xhttp.send();

How can I pass data from client to server use raw AJAX?

Hello I have already search but they often use jquery ajax to pass data from js to PHP(server-side). but for my project it has a bunch of pure js code so I should use raw AJAX to pass data.
For example, if I want to send a variable "Imgname" that value = 13 and want to echo in php page.
this is my try
<script>
if(window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if(xmlhttp.readyState === 4 && xmlhttp.status === 200) {
alert('send to server successfully');
}
};
xmlhttp.open("POST", "test2.php", true);
xmlhttp.send("Imgname=13");
}
</script>
in test2.php
<?php
$temp = $_POST['Imgname'];
echo $temp; /////output should be 13
?>
but error Undefined index: Imgname in C:\xampp\htdocs\test2.php on line 2

You need to make sure that you're sending the correct content-type:
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

Try sending the header:
var http = new XMLHttpRequest();
var url = "test2.php";
var params = "Imgname=13";
http.open("POST", url, true);
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.onreadystatechange = function() {//Call a function when the state changes.
if(http.readyState == 4 && http.status == 200) {
alert(http.responseText);
}
}
http.send(params);

Post data using XMLHttpRequest to laravel 5.2 controller as request

I have done posting/updating successfully with javascript XMLHttpRequest() to php $_REQUEST like:
function ajax_edit(e_id){
var edit_form = document.getElementById('edit_form'+e_id);
var e_name = document.getElementById('name'+e_id).value,
e_email = document.getElementById('email'+e_id).value,
e_contact = document.getElementById('contact'+e_id).value,
e_status = document.getElementById('status'+e_id).value;
xmlhttp.open('GET', 'hello-world.php?edit=yes&id='+e_id+'&name='+e_name+'&email='+e_email+'&contact='+e_contact+'&status='+e_status, true);
xmlhttp.send();
$('#edit'+e_id).modal('hide');
return false;
edit_form.reset();
}
And my php work was like:
if(isset($_REQUEST['edit'])){
$name = mysqli_real_escape_string($conn, strip_tags($_REQUEST['name']));
$email = mysqli_real_escape_string($conn, strip_tags($_REQUEST['email']));
$contact = mysqli_real_escape_string($conn, strip_tags($_REQUEST['contact']));
$status = mysqli_real_escape_string($conn, strip_tags($_REQUEST['status']));
$edit_sql = "UPDATE users SET name = '$name', email = '$email', contact = '$contact', status = '$status' WHERE id = '$_REQUEST[id]'";
$run_edit = mysqli_query($conn, $edit_sql);
}
Now I am trying to apply the same process to another Laravel 5.2 project but don't know how to do, specially the url (hello-world.php?edit=yes) part from where I will send data to my controller as request.
So far I have done with this:
function submit_form(edit_id){
xmlhttp = new XMLHttpRequest();
var edit_form = document.getElementById('edit_form'+edit_id);
var url = "{{ URL::to('updatelabdetails'); }}";
var edit_labname = document.getElementById('labname'+edit_id).value,
edit_pcname = document.getElementById('pcname'+edit_id).value;
alert(edit_pcname);
var params = "labname='+edit_labname+'&pcname='+edit_pcname";
alert(params);
xmlhttp.open('GET', url+"?"+params, true);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlhttp.onreadystatechange = function() {
if(xmlhttp.readyState == 4 && http.status == 200) {
alert(xmlhttp.responseText);
}
}
xmlhttp.send();
return false;
}
But only able to output till alert(edit_pcname); part.
My Route:
Route::post('updatelabdetails', 'LoginController#updateLabDetails');
My Controller:
public function updateLabDetails(Request $request){
$post = $request->all();
var_dump($post);
die();
}
After submitting its going to some url like /showlabdetails? with MethodNotAllowedHttpException error.
Thanks in advance.

Please update your submit_form function like this
function submit_form(edit_id){
var edit_labname = document.getElementById('labname'+edit_id).value,
edit_pcname = document.getElementById('pcname'+edit_id).value;
var http = new XMLHttpRequest();
var url = "updatelabdetails";
var params = "labname='+edit_labname+'&pcname='+edit_pcname";
http.open("POST", url, true);
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.onreadystatechange = function() {
if(http.readyState == 4 && http.status == 200) {
alert(http.responseText);
}
}
http.send(params);
}

Your laravel roure isn't correct you've registered POST route and accessing the GET one.
Change Route::post('updatelabdetails', 'LoginController#updateLabDetails'); to Route::get('updatelabdetails', 'LoginController#updateLabDetails');

you need to add token in your request as said in the laravel documentation. see this link https://laravel.com/docs/5.4/csrf

XMLHttpRequest no return value

i am unable to receive a response from the php file.
Javascript
var http = new XMLHttpRequest();
var url = "http://localhost/php_bollywood_romance.php";
var params = "film="+movie_name_entered;
http.open("POST", url, true);
//Send the proper header information along with the request
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.setRequestHeader("Content-length", params.length);
http.setRequestHeader("Connection", "close");
http.onreadystatechange = function() {//Call a function when the state changes.
if(http.readyState == 4 && http.status == 200) {
alert(http.responseText);
}
}
http.send(params);
I have even tried to do this.....
var http = new XMLHttpRequest();
if ("withCredentials" in http)
{
var url = "http://localhost/php_bollywood_romance.php";
var movie_name_entered="hi";
var params = "film="+movie_name_entered;
http.open("POST", url, true);
}
else if (typeof XDomainRequest != "undefined"){
http = new XDomainRequest();
var url = "http://localhost/php_bollywood_romance.php";
var movie_name_entered="hi";
var params = "film="+movie_name_entered;
http.open("POST", url);
} else {
http = null;
}
if (http){
http.onload = function(){
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.setRequestHeader("Content-length", params.length);
http.setRequestHeader("Connection", "close");
http.onreadystatechange = function() {//Call a function when the state changes.
if(http.readyState == 4 && http.status == 200) {
document.write(http.responseText);
callback(http.responseText);
alert("hey");
}
}
http.send(params);
};
PHP
<?php
{
$name = $_POST["film"];
$file ='data_bollywood_romance.txt';
$current=file_get_contents($file); //gets existing content from the file
$current ="$current \n $name \n";
file_put_contents($file,$current); //put newstuff
echo 'hi';
return 'yes';
}
?>
However this also does not seem to work... if i do alert("http.response") after http.send(params)...it alerts an alert with nothing written on it. I thought this might be because there is same origin policy problem so i tried to do Cross-domain Ajax with Cross-Origin Resource Sharing but that didnt work either( that is the second code). Thanks for your help in advance.

You cannot set this two headers:
http.setRequestHeader("Content-length", params.length);
http.setRequestHeader("Connection", "close");
Previous thread about your problem
I tried it without and worked fine.
Personally i would go all the way using jQuery Ajax, but thats just "lazy me" :)

Extract Title from web page, using just the url

I want to replicate some functionality from Digg.com whereby when you post a new address it automatically scans the url and finds the page title.
I am programming in classic ASP and VBScript and using javascript. Anyone know a script to make this happen..?
Many thanks in advance..
Paul

This is somewhat of a rudimentary example. You should probably include some data verification.
The ASP page should be called something like getPageTitle.asp
<%
Response.Buffer = True
Dim strURL, objXMLHTTP, objXML, strContents
Dim objRegExp, strHTML, strPattern, colMatches, strTitle
strURL = Request.Form("url")
Set objXMLHTTP = Server.CreateObject ("Microsoft.XMLHTTP")
'Or if this doesn't work then try :
'Set objXMLHTTP = Server.CreateObject("MSXML2.ServerXMLHTTP")
objXMLHTTP.Open "GET", strURL, False
objXMLHTTP.Send
strContents = objXMLHTTP.ResponseText
Set objXMLHTTP = Nothing
Set objRegExp = New RegExp
strPattern = "<title>(.*?)<\/title>"
objRegExp.Pattern = strPattern
objRegExp.IgnoreCase = True
objRegExp.Global = True
Set colMatches = objRegExp.Execute(strContents)
If colMatches.Count > 0 then
strTitle = objMatches(0).Value
Else
strTitle = ""
End If
Set objRegExp = Nothing
Response.write(strTitle)
%>
This is a basic JavaScript POST implementation. You could spruce this up a bit with any JS framework you like.
var script = "http://www.example.com/getPageTitle.asp"
var page2check = "http://www.example.com/somePageToCheck.html"
function getXMLHttpRequestObject() {
var xmlhttp;
/*#cc_on
#if (#_jscript_version >= 5)
try {
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
} catch (E) {
xmlhttp = false;
}
}
#else
xmlhttp = false;
#end #*/
if (!xmlhttp && typeof XMLHttpRequest != 'undefined') {
try {
xmlhttp = new XMLHttpRequest();
} catch (e) {
xmlhttp = false;
}
}
return xmlhttp;
}
var http = new getXMLHttpRequestObject();
var parameters = "url="+page2check;
http.open("POST", script, true);
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.setRequestHeader("Content-length", parameters .length);
http.setRequestHeader("Connection", "close");
http.onreadystatechange = function() {
if(http.readyState == 4) {
alert(http.responseText);
}
}
http.send(parameters);
var pageTitle = http.ResponseText
I hope this helps.

Send url from clientside to serverside using javascript(ajax).
Load html page by it's url using asp on serverside.
Parse html page, extract title.
Send title to clientside.