Develop Reference

Send Cookie via JS to PHP

I am trying to send a String within Javascript to my Server. I made it create a cookie and right now I would like it to do stuff (for now: a simple echo). This is my button-function (I am using Bokeh):
const d = s.data;
var clustOut = "Nevermind the real input";
if (numberOfColors.length >= 2) {
localStorage.setItem("input", clustOut);
document.cookie = ('clustOut=' + clustOut + ';max-age=10368000;' + ';path=/');
window.location.href = "/php-scripts/post_cluster.php";
//alert(numberOfColors.length + "\\n" + clustOut);
//alert(d["x"] + d["y"] + d["color"]);
} else {
alert ("You have to assign the points to at least two clusters!");
}
My PHP-Files should simply echo:
<?php
$clustOut = $_COOKIE['clustOut'];
echo $clustOut;
?>
I am pretty sure that window.location.href = "/php-scripts/post_cluster.php"; might be the wrong command for a submit. What can I do to make my PHP-Script get the Cookie that I just set?

Sending data with the Fetch API.
The client and server can communicate with each other with the HTTP protocol. Whenever you load a webpage a HTTP request is send to the server and a response is send back to the client. You can make your own requests and talk to the server through the same protocol with the Fetch API.
You send the data to the server and wait for a response to come back. This way you can check what the server received and maybe do something with the response you got back.
let data = {
clustOut: "Nevermind the real input"
};
fetch('/php-scripts/post_cluster.php', {
method: 'POST',
body: JSON.stringify(data)
}).then(response => {
if (response.status === 200 && response.ok) {
return response.text();
}
}).then(message => {
console.log(message);
});
Sending data with XMLHttpRequest (IE10+)
For browsers that don't support the Fetch API fall back to the older XMLHttpRequest. It does the same thing, but is written differently.
var xhr = new XMLHttpRequest();
xhr.onload = function() {
if (this.status === 200) {
console.log(this.responseText);
}
}
xhr.open('POST', '/php-scripts/post_cluster.php');
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xhr.send(JSON.stringify(data));
Sending data with the a form.
A more analogue approach would be to use a <form> element with the action attribute pointing towards your PHP script. This will also send a request to the PHP file while reloading the page. However, reading out the response works differently as you need to display the response on the page during rendering to see the outcome.
<form method="POST" action="/php-scripts/post_cluster.php">
<input type="hidden" name="clustOut" value="Nevermind the real input">
<button type="submit">Send</button>
</form>
Receiving data on server
Because in the examples above we've used the POST method to send our data, we'll need to access the global $_POST variable in PHP to read out the data that has been send. The value that is being returned or echoed will be send back in the response to the client.
<?php
$clust_out = isset( $_POST[ 'clustOut' ] ) ? $_POST[ 'clustOut' ] : '';
return $clust_out . ' has been received';
?>

How to embed yammer private messages on my website?

I know how to embed a feed which has a certain ID. I already did it. Now I'd like to implement the following functionality: If a user receives a private message, it will appear on an embedded feed. The best option in my opinion would be to embed the whole "chat window", but I didn't find a single code sample on the web. How can I do that?

You cannot really embed private messages like you can with feeds, because Yammer's REST APIs (incl. private messages) require authentication via OAuth 2.0. That means you have to create a Yammer API application which will ask your users to log in and allow you to access their messages. The overall concept of that described in their documentation here and here.
Yammer provides several SDKs you can use, one of them is the Javascript SDK. I pieced togehter a simple example of how you can ask users to log in and then it will display their private messages. Mind you, this is a very simple solution, I just tested it on a single one-to-one conversation.
<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript" data-app-id="YOUR-APP-CLIENT-ID" src="https://c64.assets-yammer.com/assets/platform_js_sdk.js"></script>
</head>
<body>
<span id="yammer-login"></span>
<div id="messages"></div>
<script>
yam.connect.loginButton('#yammer-login', function (resp) {
if (resp.authResponse) {
document.getElementById('yammer-login').innerHTML = 'Welcome to Yammer!';
}
});
var msgdiv = document.querySelector("#messages");
yam.getLoginStatus(
function(response) {
if (response.authResponse) {
console.log("logged in");
var myId = response.authResponse.user_id;
yam.platform.request({
url: "messages/private.json",
method: "GET",
success: function (response) {
console.log("The request was successful.");
var usernames = {};
response.references.forEach(function(ref){
if(ref.type === "user") {
usernames[ref.id] = ref.full_name;
}
});
response.messages.forEach(function(message){
var msg = document.createElement("span");
msg.innerHTML = usernames[message.sender_id] + ": " + message.body.parsed + "<br/>";
msgdiv.appendChild(msg);
})
},
error: function (response) {
console.log("There was an error with the request.");
console.dir(private);
}
});
}
else {
console.log("not logged in")
}
}
);
</script>
</body>
</html>
The response from the messages/private.json API endpoint is a JSON file that you can go through. It includes information about the message and the users involved in the conversation.

Sending EMail from my Javascript App via GMail API - mail appears in GMail sent list, but isn't delivered to destination email address

I've been writing a client (Chrome browser) App that integrates with GMail via the REST API. My app is written in Javascript/Angular and most of the GMail integration works fine. It can fetch from GMail - emails, profiles, labels, etc.
I'm not able to send emails I create. However, the emails I try to send do appear in the GMail sent list and, if I modify the email by adding the 'INBOX' label, they also appear in the GMail inbox. But none of the emails make it to their destination. I've been testing with several email accounts - Hotmail, Yahoo and another GMail account. Emails are never delivered to their destinations - I've checked the inboxes, spam, etc.
My code is below ... Function 'initializeGMailInterface' is run first (via the User Interface) to authorize and then the 'sendEmail' function (also via the User Interface). The code seems to track with examples I've seen and the documentation Google provides for their REST API. Authentication seems to work OK - and as I mentioned, I'm able to fetch emails, etc.
How do I get the emails to their destination?
var CLIENT_ID = '853643010367revnu8a5t7klsvsc5us50bgml5s99s4d.apps.googleusercontent.com';
var SCOPES = ['https://mail.google.com/', 'https://www.googleapis.com/auth/gmail.send', 'https://www.googleapis.com/auth/gmail.modify', 'https://www.googleapis.com/auth/gmail.labels'];
function handleAuthResult(authResult) {
if (authResult && !authResult.error) {
loadGmailApi();
}
}
$scope.initializeGMailInterface = function() {
gapi.auth.authorize({
client_id: CLIENT_ID,
scope: SCOPES,
immediate: true
}, handleAuthResult);
};
function loadGmailApi() {
gapi.client.load('gmail', 'v1', function() {
console.log("Loaded GMail API");
});
}
$scope.sendEmail = function() {
var content = 'HELLO';
// I have an email account on GMail. Lets call it 'theSenderEmail#gmail.com'
var sender = 'theSenderEmail#gmail.com';
// And an email account on Hotmail. Lets call it 'theReceiverEmail#gmail.com'\
// Note: I tried several 'receiver' email accounts, including one on GMail. None received the email.
var receiver = 'theReceiverEmail#hotmail.com';
var to = 'To: ' +receiver;
var from = 'From: ' +sender;
var subject = 'Subject: ' +'HELLO TEST';
var contentType = 'Content-Type: text/plain; charset=utf-8';
var mime = 'MIME-Version: 1.0';
var message = "";
message += to +"\r\n";
message += from +"\r\n";
message += subject +"\r\n";
message += contentType +"\r\n";
message += mime +"\r\n";
message += "\r\n" + content;
sendMessage(message, receiver, sender);
};
function sendMessage(message, receiver, sender) {
var headers = getClientRequestHeaders();
var path = "gmail/v1/users/me/messages?key=" + CLIENT_ID;
var base64EncodedEmail = btoa(message).replace(/\+/g, '-').replace(/\//g, '_');
gapi.client.request({
path: path,
method: "POST",
headers: headers,
body: {
'raw': base64EncodedEmail
}
}).then(function (response) {
});
}
var t = null;
function getClientRequestHeaders() {
if(!t) t = gapi.auth.getToken();
gapi.auth.setToken({token: t['access_token']});
var a = "Bearer " + t["access_token"];
return {
"Authorization": a,
"X-JavaScript-User-Agent": "Google APIs Explorer"
};
}

Your code is doing an insert(). Do a send() instead:
var path = "gmail/v1/users/me/messages/send?key=" + CLIENT_ID;

The 'emailJS' is a good solution for sending email from Javascript.
EmailJS helps to send emails using client-side technologies only. No server is required.
Additionally, you can easily add attachments, require CAPTCHA validation, switch
between the email services without making code changes, review the history of
the email request, and more.
More Info

Google forms auto-email not showing up

My company has a google form that we use to submit requests for data pulls. I created a script that auto emails form responses to myself, as well as a copy to the submitter. The script is:
function Initialize() {
var triggers = ScriptApp.getScriptTriggers();
for(var i in triggers) {
ScriptApp.deleteTrigger(triggers[i]);
}
ScriptApp.newTrigger("SendGoogleForm")
.forSpreadsheet(SpreadsheetApp.getActiveSpreadsheet())
.onFormSubmit()
.create();
}
function SendGoogleForm(e)
{
try
{
// You may replace this with another email address
var email = "My Email Goes here"
var Owner = e.namedValues["Owner:"].toString();
cc = email + "," + Owner
Adv = e.namedValues["Advertiser Name:"].toString();
IO = e.namedValues["IO Name:"].toString();
Tog = "Pixel Request " + Adv + " " + IO;
// Optional but change the following variable
// to have a custom subject for Google Form email notifications
var subject = Tog;
var s = SpreadsheetApp.getActiveSheet();
var columns = s.getRange(1,1,1,s.getLastColumn()).getValues()[0];
var message = "";
// Only include form fields that are not blank
for ( var keys in columns ) {
var key = columns[keys];
if ( e.namedValues[key] && (e.namedValues[key] != "") ) {
message += key + ' :: '+ e.namedValues[key] + "\n\n";
}
}
// This is the MailApp service of Google Apps Script
// that sends the email. You can also use GmailApp for HTML Mail.
MailApp.sendEmail(cc, subject, message);
} catch (e) {
Logger.log(e.toString());
}
}
The script sends the emails without a problem. However, while the email sent to myself shows up in my sent mail, no copy is delivered to my inbox and it is marked as read; this is a problem because then I do not know that requests have been submitted which was the point of this creation. This seems anomalous as normally emails to yourself will typically show up in the inbox as unread. Does anyone know a way I might be able to fix this?

This is not an issue with the Google Script. This is probably how Gmail handles email where the sender and recipient is you.

Is it possible to ping a server from Javascript?

I'm making a web app that requires that I check to see if remote servers are online or not. When I run it from the command line, my page load goes up to a full 60s (for 8 entries, it will scale linearly with more).
I decided to go the route of pinging on the user's end. This way, I can load the page and just have them wait for the "server is online" data while browsing my content.
If anyone has the answer to the above question, or if they know a solution to keep my page loads fast, I'd definitely appreciate it.

I have found someone that accomplishes this with a very clever usage of the native Image object.
From their source, this is the main function (it has dependences on other parts of the source but you get the idea).
function Pinger_ping(ip, callback) {
if(!this.inUse) {
this.inUse = true;
this.callback = callback
this.ip = ip;
var _that = this;
this.img = new Image();
this.img.onload = function() {_that.good();};
this.img.onerror = function() {_that.good();};
this.start = new Date().getTime();
this.img.src = "http://" + ip;
this.timer = setTimeout(function() { _that.bad();}, 1500);
}
}
This works on all types of servers that I've tested (web servers, ftp servers, and game servers). It also works with ports. If anyone encounters a use case that fails, please post in the comments and I will update my answer.
Update: Previous link has been removed. If anyone finds or implements the above, please comment and I'll add it into the answer.
Update 2: #trante was nice enough to provide a jsFiddle.
http://jsfiddle.net/GSSCD/203/
Update 3: #Jonathon created a GitHub repo with the implementation.
https://github.com/jdfreder/pingjs
Update 4: It looks as if this implementation is no longer reliable. People are also reporting that Chrome no longer supports it all, throwing a net::ERR_NAME_NOT_RESOLVED error. If someone can verify an alternate solution I will put that as the accepted answer.

Ping is ICMP, but if there is any open TCP port on the remote server it could be achieved like this:
function ping(host, port, pong) {
var started = new Date().getTime();
var http = new XMLHttpRequest();
http.open("GET", "http://" + host + ":" + port, /*async*/true);
http.onreadystatechange = function() {
if (http.readyState == 4) {
var ended = new Date().getTime();
var milliseconds = ended - started;
if (pong != null) {
pong(milliseconds);
}
}
};
try {
http.send(null);
} catch(exception) {
// this is expected
}
}

you can try this:
put ping.html on the server with or without any content, on the javascript do same as below:
<script>
function ping(){
$.ajax({
url: 'ping.html',
success: function(result){
alert('reply');
},
error: function(result){
alert('timeout/error');
}
});
}
</script>

You can't directly "ping" in javascript.
There may be a few other ways:
Ajax
Using a java applet with isReachable
Writing a serverside script which pings and using AJAX to communicate to your serversidescript
You might also be able to ping in flash (actionscript)

You can't do regular ping in browser Javascript, but you can find out if remote server is alive by for example loading an image from the remote server. If loading fails -> server down.
You can even calculate the loading time by using onload-event. Here's an example how to use onload event.

Pitching in with a websocket solution...
function ping(ip, isUp, isDown) {
var ws = new WebSocket("ws://" + ip);
ws.onerror = function(e){
isUp();
ws = null;
};
setTimeout(function() {
if(ws != null) {
ws.close();
ws = null;
isDown();
}
},2000);
}
Update: this solution does not work anymore on major browsers, since the onerror callback is executed even if the host is a non-existent IP address.

To keep your requests fast, cache the server side results of the ping and update the ping file or database every couple of minutes(or however accurate you want it to be). You can use cron to run a shell command with your 8 pings and write the output into a file, the webserver will include this file into your view.

The problem with standard pings is they're ICMP, which a lot of places don't let through for security and traffic reasons. That might explain the failure.
Ruby prior to 1.9 had a TCP-based ping.rb, which will run with Ruby 1.9+. All you have to do is copy it from the 1.8.7 installation to somewhere else. I just confirmed that it would run by pinging my home router.

There are many crazy answers here and especially about CORS -
You could do an http HEAD request (like GET but without payload).
See https://ochronus.com/http-head-request-good-uses/
It does NOT need a preflight check, the confusion is because of an old version of the specification, see
Why does a cross-origin HEAD request need a preflight check?
So you could use the answer above which is using the jQuery library (didn't say it) but with
type: 'HEAD'
--->
<script>
function ping(){
$.ajax({
url: 'ping.html',
type: 'HEAD',
success: function(result){
alert('reply');
},
error: function(result){
alert('timeout/error');
}
});
}
</script>
Off course you can also use vanilla js or dojo or whatever ...

If what you are trying to see is whether the server "exists", you can use the following:
function isValidURL(url) {
var encodedURL = encodeURIComponent(url);
var isValid = false;
$.ajax({
url: "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20html%20where%20url%3D%22" + encodedURL + "%22&format=json",
type: "get",
async: false,
dataType: "json",
success: function(data) {
isValid = data.query.results != null;
},
error: function(){
isValid = false;
}
});
return isValid;
}
This will return a true/false indication whether the server exists.
If you want response time, a slight modification will do:
function ping(url) {
var encodedURL = encodeURIComponent(url);
var startDate = new Date();
var endDate = null;
$.ajax({
url: "http://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20html%20where%20url%3D%22" + encodedURL + "%22&format=json",
type: "get",
async: false,
dataType: "json",
success: function(data) {
if (data.query.results != null) {
endDate = new Date();
} else {
endDate = null;
}
},
error: function(){
endDate = null;
}
});
if (endDate == null) {
throw "Not responsive...";
}
return endDate.getTime() - startDate.getTime();
}
The usage is then trivial:
var isValid = isValidURL("http://example.com");
alert(isValid ? "Valid URL!!!" : "Damn...");
Or:
var responseInMillis = ping("example.com");
alert(responseInMillis);

const ping = (url, timeout = 6000) => {
return new Promise((resolve, reject) => {
const urlRule = new RegExp('(https?|ftp|file)://[-A-Za-z0-9+&##/%?=~_|!:,.;]+[-A-Za-z0-9+&##/%=~_|]');
if (!urlRule.test(url)) reject('invalid url');
try {
fetch(url)
.then(() => resolve(true))
.catch(() => resolve(false));
setTimeout(() => {
resolve(false);
}, timeout);
} catch (e) {
reject(e);
}
});
};
use like this:
ping('https://stackoverflow.com/')
.then(res=>console.log(res))
.catch(e=>console.log(e))

I don't know what version of Ruby you're running, but have you tried implementing ping for ruby instead of javascript? http://raa.ruby-lang.org/project/net-ping/

let webSite = 'https://google.com/'
https.get(webSite, function (res) {
// If you get here, you have a response.
// If you want, you can check the status code here to verify that it's `200` or some other `2xx`.
console.log(webSite + ' ' + res.statusCode)
}).on('error', function(e) {
// Here, an error occurred. Check `e` for the error.
console.log(e.code)
});;
if you run this with node it would console log 200 as long as google is not down.

You can run the DOS ping.exe command from javaScript using the folowing:
function ping(ip)
{
var input = "";
var WshShell = new ActiveXObject("WScript.Shell");
var oExec = WshShell.Exec("c:/windows/system32/ping.exe " + ip);
while (!oExec.StdOut.AtEndOfStream)
{
input += oExec.StdOut.ReadLine() + "<br />";
}
return input;
}
Is this what was asked for, or am i missing something?

just replace
file_get_contents
with
$ip = $_SERVER['xxx.xxx.xxx.xxx'];
exec("ping -n 4 $ip 2>&1", $output, $retval);
if ($retval != 0) {
echo "no!";
}
else{
echo "yes!";
}

It might be a lot easier than all that. If you want your page to load then check on the availability or content of some foreign page to trigger other web page activity, you could do it using only javascript and php like this.
yourpage.php
<?php
if (isset($_GET['urlget'])){
if ($_GET['urlget']!=''){
$foreignpage= file_get_contents('http://www.foreignpage.html');
// you could also use curl for more fancy internet queries or if http wrappers aren't active in your php.ini
// parse $foreignpage for data that indicates your page should proceed
echo $foreignpage; // or a portion of it as you parsed
exit(); // this is very important otherwise you'll get the contents of your own page returned back to you on each call
}
}
?>
<html>
mypage html content
...
<script>
var stopmelater= setInterval("getforeignurl('?urlget=doesntmatter')", 2000);
function getforeignurl(url){
var handle= browserspec();
handle.open('GET', url, false);
handle.send();
var returnedPageContents= handle.responseText;
// parse page contents for what your looking and trigger javascript events accordingly.
// use handle.open('GET', url, true) to allow javascript to continue executing. must provide a callback function to accept the page contents with handle.onreadystatechange()
}
function browserspec(){
if (window.XMLHttpRequest){
return new XMLHttpRequest();
}else{
return new ActiveXObject("Microsoft.XMLHTTP");
}
}
</script>
That should do it.
The triggered javascript should include clearInterval(stopmelater)
Let me know if that works for you
Jerry

You could try using PHP in your web page...something like this:
<html><body>
<form method="post" name="pingform" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<h1>Host to ping:</h1>
<input type="text" name="tgt_host" value='<?php echo $_POST['tgt_host']; ?>'><br>
<input type="submit" name="submit" value="Submit" >
</form></body>
</html>
<?php
$tgt_host = $_POST['tgt_host'];
$output = shell_exec('ping -c 10 '. $tgt_host.');
echo "<html><body style=\"background-color:#0080c0\">
<script type=\"text/javascript\" language=\"javascript\">alert(\"Ping Results: " . $output . ".\");</script>
</body></html>";
?>
This is not tested so it may have typos etc...but I am confident it would work. Could be improved too...