AJAX :: What Is COMET - Open A Long-lived HTTP Request ?
Nov 15, 2011
I've been reading a lot about Comet and I've been interested in implementing it. It doesn't sound that difficult, but I have yet to find concrete examples of what it is, so I don't know how to actually use it.
I've seen some examples where new ajax requests are made as soon as old ones are complet but this doesn't make any sense to me. It seems this method is a complete resource bandit.
For example, how do I open a long-lived HTTP request? If the request is long-lived, when does the callback get actually called - at the very end of the request (status == 200 and readyState == 4) or can I call it intermittently to download new data while my PHP script is in sleep()-ing?
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Apr 14, 2006
Is it possible for an AJAX request to be left open for multiple responses? This could avoid repetitive polling of the server.
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Sep 21, 2006
I want to make a chat system using the Comet push-style technology. I
already wrote a poll-based one using Ajax, but I want to learn how to
do server-pushes. Does anyone know of a good website that can show me
how to do this? Or recommend a good library/framework to use?
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Oct 4, 2006
Hi all, I'm trying to submit the google sitemap after it has been created on
my server with PHP.
Here is the code:
<?php $address= urlencode('www.mysite.com/sitemap.gz');?>
<form name="submitsitemap" method="POST"
action="http://www.google.com/webmasters/sitemaps/ping?sitemap=<?php echo
$address;?>"></form>
<script>submitsitemap.submit();</script>
The problem is that in the URL i've this:
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Aug 18, 2009
How do I load an external http xml request with jquery? Below is a url when pasted into a web browser like firefox, an xml document is shown. This is for the CPanel XML API. [URL] How do I make this work in jquery using an xml request? View this message in context: [URL] Sent from the jQuery General Discussion mailing list archive at [URL]
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Apr 21, 2011
i have a page which loads content into a div from a hidden div. There are about 8 hidden divs all loaded with content loaded. Then when the user clicks a link the visible div is loaded with the content from one of them. Is this the best way? or should i be loading the content from another script via $.get()?
i use the same thing on my PM system which loads 10 hidden divs. So should i really be using $.get() for this aswell?
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Apr 6, 2009
Is it possible to take a url from a text box and request the HTTP Response Header and then document.write() it? I'm envisaging a form into which a user can enter a url and receive the Response Header information. Could I achieve this with JavaScript?
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Feb 2, 2010
I am writing JavaScript code that runs inside HTTP page, I need to make XMLHttpRequest to a REST web service. The service is running on the same site but it only accepts HTTPS. I tried to prefix the URL with https:// and Firefox rejected it as cross-site scripting attempt. It's not really cross site as I am calling the same site.
I don't have an option to redirect the entire page to https.
Is there a proper way to implement this request?
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Jul 2, 2010
i want to find out the idle time when there is no http request is going on..i dont want to track any mouse or key board events.i dont want that..i read these thread but it is only about screen idle time URL...i am trying to track the time when there is no transaction going between client and server and no http request is sending if i will get that time then that time i can use to load my additional javascript files.so further transaction of user will become speed up..
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Oct 25, 2011
I've come back to working on something I built a while ago. Just a small function that I started that displays links by searching through a text area and grabbing all a hrefs. I want to try and build on it to check for dead links. This is the report code:
Code:
function report(){
document.getElementById("htmlDiv").innerHTML = document.getElementById("htmlArea").value;
a = document.getElementById("htmlDiv").getElementsByTagName("a");
for(i=0; i < a.length; i++){
//window.open(a[i].href)//the ( and ) characters signify that window.open is a function;
if(i == 0){
document.getElementById("report").innerHTML = "<li><a href="" + a[i].href + "" />" + a[i].href + "</a></li>";
document.getElementById("report").style.display = "block";
} else {
document.getElementById("report").innerHTML += "<li><a href="" + a[i].href + "" />" + a[i].href + "</a></li>";
}}
document.getElementById("reportNumber").innerHTML = "Total: " + i;
}
I was thinking maybe I could encorporate the following into this maybe?
Code:
function UrlExists(url) {
var http = new XMLHttpRequest();
http.open('HEAD', url, false);
http.send();
return http.status!=404;
}
The above makes sense to me as I think it is saying as long as its not 404 its ok. I want to incorporate something like that so my report displays links and maybe strikes them through if they return 404 or are dead.
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Feb 8, 2007
I have written an Ajax application which can send http HEAD requests
and receive the header response from server.
Now I want to show the different values in formatted manner. However,
there seems be no character or expression which I can use to split the
HEAD response for string processing.
Here is a sample of server response:
Mime-Version: 1.0 Date: Thu, 08 Feb 2007 03:51:13 GMT Server: Apache/
2.0.1a Content-Type: text/html; charset=utf-8 Content-Length: 69
Connection: close
If you have any information regarding this please do let me know.
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Jun 2, 2009
I worked with now in jQuery. Property however at present the following problem: [i]I provide a AJAX Request. the side is loaded, the parameters all conveyed and back receives I a complete HTML side. Now I would like to have only certain elements however from this side, like DIV, SPAN etc. How can I make with the AJAX Request return in such a way best, which I can select these elements thereby? Simply it would be unfortunately not functioned over the function $ (element), it even if I indicate the HTML Request as secondly parameter.[/i] Excused, for my bad English. ;-) Translatertool. There is unfortunately too many words, in order to describe my problem. ^^
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Oct 16, 2010
I have a php page which returns a table representing a query sent to a MySQL database. So far it has worked in every case except now that I'm trying to use it to call a stored procedure, in which case the readystate is staying at 1 and never completing.
I have logged the results of the php file both in an error log and looked at the response from the request using firebug, both of which show a correct result.
Why isn't this returning properly?
Here are the relevant javascript functions:
Code:
function customizeType()
{
$("custom-header").innerHTML = "";
$("custom-top").innerHTML = "";
[Code]....
After the page loads, the error log shows correct results for all queries.
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Dec 6, 2010
Here is what I'm trying to do but the problem is "source.html" is not on a server somewhere. I am running everything locally. $('#container').load(source.html #sourceContent) Is there a way to do this exact thing but with a local file?
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Apr 8, 2010
For some reason, IE8 insists on submitting an HTTP GET request when the user presses "enter" when inside of an <input> element.It's a rather curious thing because I have an <input type="submit" /> that has an event for "click" that contains the following code:
event.preventDefault();
event.stopImmediatePropagation();
This works on Firefox - if the user presses "Enter" inside of an input element on the form, the submit button will not execute. But on IE, it does. However, if the IE user "clicks" the submit button, it does the right thing.Do I have to also override keydown events too and stop those? Why does Firefox and IE work differently here?
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Aug 24, 2009
I don't have this problem in any other web browser. I've googled about and I haven't managed to find anything...
[Code]...
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May 11, 2011
Is their anyway to have a tight loop of code long for a long period of time without freezing the page? I want to be able to do:
for (i=0;i<9999999999;i++){
//some code
if (i%100==0){
yield();
}
}
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Nov 15, 2011
It's my first post/thread here, I haven't been active in forums for some time cause frankly I didn't need it, but this one just got me. I tried everything in my knowledge -and I mean everything, I'm a fanatic trial-and-error tester. Situation: jQuery, posts some data through Ajax collected primarily from a $('#textarea') to a php file on server. If the data is >X Bytes, I get 404 Not Found and the 404 Html page in Ajax error handler. Otherwise, everything runs smoothly and I get my results. I must specify that I post to a php file that loads Wordpress's wp-blog-header.php before doing calculations, as the code is intended to be part of a WPplugin.
I tried to return header("HTTP/1.1 200 OK") as some suggested, considering WP was altering the header for not finding the file as part of the system, and it solved the issue locally for some cases, but not remotly.
I tried to set the Content-Length in ajax call. I switched between the WP type of handling Ajax calls, and having my own .php file, in the folder of my plugin. Nothing worked, but trimming content. What could this be? post_data_size is 8M on server. Could this be maybe related to SSL as I've seen in some cases?
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Sep 29, 2011
I have gone through the basic techniques to implement comet server like streamhub,Maven/Jetty etc. I have following questions for that :
After that I found the issues like in case of Maven/Jetty internet connection is required for downloading certain files from net.So it it possible to implement it if no internet connection is there on machine where the web server is hosted ?
Also I want the open source tools/technologies to achieve the thing mentioned in the above question. and I think stream hub is not a open source free version. which is free/open source to use.
Currently the web application is running on apache web server. so if I use comet server what changes I need to do in that ?
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Oct 11, 2011
I am trying to load something in a tab using AJAX. However it will not work if the URL is using http, for example, [url], or [url].
I know the HTML and JS is fine as it will load files that do not have http, like the third list item in the example.
EXAMPLE:
I cannot understand why this is.
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May 12, 2009
I am doing xmlhttp ajax stuff. I am using a script called "SEXYALERTBOX". I am using it to allow the user to input a password. The textbox is called BoxPromptInput. I do not think its inside a <form> tag.
Here is the code:
function askForPass() {
Sexy.prompt('Please type the password in order to see the pictures/videos','' ,{ onComplete:
function(returnvalue) {
if(returnvalue) {
var xmlhttp = false;
var pageResponse = null;
try{xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");}
catch (error){try {xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");} catch (error) {xmlhttp = false;}} .....
Any way to pass the value since I am sure the request.form would not work in this case since its not in a form.
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Jun 30, 2009
I was guessing if it was possible, using jQuery, to have a link that, when clicked, opens the relative url and sends to it a post request. I'm trying to do this with the $.post function, but i found the problem that the request is sent, but the page isn't opened.
This is my code:
<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
[Code]....
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Jun 23, 2009
Is it possible to call a http url for ajax query i.e.[code]
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Apr 8, 2010
I have an application running on a non-interactive kiosk that I need to keep updated with information that will be provided by a remote server. To do this, I've created an XMLHttpRequest/Microsoft.XMLHTTP object that checks the modified date in the header of a watched file that resides on a remote server.
This function runs on an interval, and if it detects a change in the modified date since the last check, it retrieves new information from the remote server.
[Code]...
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Jun 29, 2011
As the title implies, i need to make use ajax with GET method and with data in the http request body. I can do it with POST method but i don't know how to do it with GET. In php, it's easy...
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Jun 29, 2010
I use AJAX functionality in my project & my coding something similar to the following:
$('.home').click(function(event){
event.preventDefault();
$.ajax({
url: 'home.html',
[Code]....
Initially I (successfully) tested my project after deploying to the Apache server which is running in the localhost.
But, if I just open the page in a browser (without deploying to the server), the project works fine! How this is possible?
According to my understanding, if we send an AJAX request, which is really an HTTP request, which has to be received by an HTTP server and the response should come from the server.
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