I'm trying to implement a simple chatting website. For now what the code does is checking every 10 seconds if there are new posts stored in the database (newer than the last check, 10 seconds ago). Is there a more efficient way than doing this with a timer??? for example, is there some kind of event listener attached to the server that would notify the client whenever the db is updated?
View 1 Repliesi want to know if its possible to update a page based on some information we recieve from a device which a client will have.the simple issue is that a client device will be sending me some values by making a request along with some parameter values. i have to recieve the request, get the values and update the information on the web page.i don't know if the get() and post() function can be used in any way.. they are supposed to send request.if I don't find a solution using jquery, i will be forced to use a servlet, but then again, i have to somehow update the page directly, i can't save the data anywhere and read it. because, one thing is the data is critical and other thing is that i will get data every 5 seconds.
View 3 Replies View RelatedI am creating a basic page for a client to allow them to update photo captions on their own. The test page is here: [url]
There are only 4 photos right now for testing, but eventually there will be 100's. The issue I'm having is that only the first image caption is being updated. If I edit the caption for photo #4 and click update, it appears to update, but it actually doesn't. Further testing shows if I change the caption for #1 and click submit on ANY other caption, it updates #1. This makes me think that the jQuery code is only referencing the first form.
I know I could use ID's on the forms and in the jQuery to differentiate the forms, however the form HTML code is generated with PHP and there will be 100's of them. Is there any way for jQuery to determine which form was submitted? I need to be able to tell which form was submitted so I can use that form's caption text to update the photo caption via SQL (photo info stored in an SQL database).
Here's the code from the page. The forms are generated via PHP:
I'm doing some jquery and ajax work with C# asp.net MVC on the server.
I have this JS function:
function DeleteListing(receiptItemId){
$.ajax({
url: "DeleteListing",
type: "POST",
[Code].....
What I'm wondering is there ways to return values from DeleteListing on the server to the success function?
My login to the site is being processed using ajax, which does a redirect to the members page upon succesfull loggin in.The login feature however can in fact take a while because we need to initialise quite some data when a user logs in (his details, but also his privileges are loaded, his personal menu based on these privileges are being loaded, we are loading shopping cart info, we are initialising personalisation settings, and a whole lot more.It sounds like a big thing, but it isn't, and once logged in, the application is going great. the only thing is that the login proceure can take 3 - 4 seconds, and I would like to be able to show the client the progress of the serverside script:
"Searching your account..."
"Validating your privileges"
"Initialising your personal menu"
blablabla...
To do this, I might just call an ajax call that starts the login procedure, and then issue another ajax call every 1 second or so to update the status based on some session variables I set in the login procedure and that I can serve to the client when th next ajax calls come in, but I would love for this to work a little nicer as in just needing to initialise ONE ajax call which can send back statusupdates from the server...
How can I get a server value into client event?
Or is there another way around my problem?
I have a ASP page that need to get the server IP
(Request.ServerVariables("LOCAL_ADDR")) to open a new asp page
this is some of my HTML that I want to work. Code:
What is the best way to get the client time to the server? Would I user http headers? (I dont know how to do that) or is ajax the best method? I could use ajax to send the unix timestamp to the server everytime a page loads and save the difference between it and the server timestamp as a session variable. sounds sensible?
I dont want to work with timezones but I do want to get the actual time set on the client's computer.
I understand that JavaScript resides on a server and is served to the client via the web server & the web browser.Is it possible to run JavaScript programs locally without the web server piece?
View 3 Replies View RelatedI posted the same post in PHP section but thought might be related to Javascript too. So here goes:
I want to create a decent log at clients side to show alerts from server.
So, server should be able to see a list of connected clients (registered user) on the website, and select a few of them, type something in textbox, clicks send to all of selected clients, and the message is shown in the log at client's website. Also plays a simple sound file when clients receive new message in the log.
The only way i can think of doing such a thing is having an active
server page that returns an image, that is generated on the fly. As
long as there is no caching on the client this in theory will allow
the client to perform an action on the server and display an image
generated on the fly as a result of this action without actually
reloading the page, simply by requesting an image.
id like to know how can i create a cookie on the client side as well as to script my server side coding to retrieve the cookie value.
View 1 Replies View Relatedwhat is the difference between client side JavaScript and server side JavaScript? Client side JavaScript is directly embedded in the HTML code...what about serve side scripting?
View 1 Replies View RelatedI have a few values and variables that I want to post to a server
(without using a SUBMIT button). Is there a way to post data from
within javascript - do sockets or connections have to be open for this
to work?
I am developing an ASP.NET (C#) application and need some help. I wish
to call a server-side function (in the code-behind "file.aspx.cs") upon
a user clicking on the "X" to close the browser window. Is there a way
to postback and call a server-side function when this happens? I am
aware of the browser's native "onunload" event, but am not certain that
what I'm looking for is actually possible.
I'm new to JavaScript. I have relatively large amounts of text (~200 kB) that I need to transfer to my web application every now and then. Using RAR, I get a 5:1 compression ratio on these files, for example one of 180 kB is compressed to 34kB.
Is there some standard way to decompress files in JavaScript?
Is it somehow possible to setup a backend server to send a message to a client? Or it is a client always have to establish a connection? What I'm trying to code is a simple chat script that sends a message to the client once a member of the chatroom has logged out. The only way that I can make this work is if the client either sends a message (which is a POST call) or when a time delay occurs (I've set a timer to run every 30s after the last GET or POST call). But both of these are basically CLIENT -> SERVER calls. I don't assume that the other way (SERVER -> CLIENT) is possible? no?
View 2 Replies View RelatedI know that Javascript is client side, but I'd like to know the best way to populate HTML drop downs in real time based on information typed in the other HTML form fields with information found on the server as opposed to the client.For instance if a user wants to select certain files located in a directory on the server, as they type in the pathname supposedly containing the files the drop downs continually refresh themselves with the server files listed in that directory (if it exists, and apache has permissions to see what's inside) as if it was showing client files instead.
What would be nice is if my browser could continually query the server for some of its private information and not have to refresh itself to obtain it, whether that means the server-side would have to continually refresh itself makes no difference to me as long as the client-side doesn't have to. But I guess this is not possible because no matter what you would have to at least refresh the client-side page once?Submitting the form to a CGI or PHP script would not work because I need this functionality to help populate the form BEFORE I send it.I would like to not have to press a button to update the form every time I change the pathname and need to update the drop downs since this would be annoying.
i am trying to put some code within my js such that, when the server
"sends it a message" it refreshes the page. now i have the refresh part
of things. the place where i am stuck is, how can my server (tomcat, am
using a java web app) send a very small piece of info to the js which
when it receives it, refreshes the page.
I am building a client-side and server-side solution and want to use JSON through Ajax in both directions. I have ASP or JavaScript server-side, though Microsoft's support of server side JavaScript seems nil, so I am reluctantly conceeding to use ASP. I'd appreciate suggestions on available solutions to encode/decode JSON on the server-side (ASP or JavaScript). I don't plan to load jQuery server-side so that rules out plug-ins. I'd also like to know what is the latest client-side encode/decode for JSON. Is it built in jQuery or a plug-in? In both server and client, decoding JSON securely is key, so using eval () to decode is out.
View 1 Replies View RelatedI am trying to create a web page in which the contents of one selection list
depends upon which element in another selection list is chosen, but where
the information to populate the first selection list comves from an SQL
database on the web server.
There are a couple of these situations in my application but, for example,
the first list might be a list of counties, and the second list a list of
states/provinces. Obviously the names of counties depend upon which
state/province is chosen, but there are too many possibilities to be able to
embed them within the web page itself. So when the user selects a
state/province I need to go to the server to ask for the list of counties.
I have seen a number of posts that sort of address this issue. For example
it is suggested to use <script src="a URL"/> to ask the server side code to
send up data of type "text/javascript". However the examples do not seem to
address how the server side code would know which state/province the user
had selected.
If there is a web site that addresses this sort of thing, I would appreciate
any pointers.
I was wondering if there's a quick and simple way to notify a user if an ajax connection is broken, for example you're calling a file, but due to your internet connection, the file cannot be relayed back to you, so the existed javascript code on the initial page you're on, notifys you of the problem.
View 1 Replies View RelatedI wanted to put a js popup link, but it is dead when js disabled.
View 6 Replies View RelatedI am developing a web form using python cgi which has two list boxes. On selecting a value from the listbox1, the list box 2 should get auto populated with appropriate values (which are taken from the DB). I have written a javascript function to get the selected value from the list box1. But I am struck with passing the values from the javascript to the python function written in server side in which I have written the DB related stuffs.
View 1 Replies View RelatedI have a Hyperlink within a String like below:
sSql = "SELECT DISTINCT " + "'Action' = '<center><a
href='+char(34)+'ChangeRequest.aspx?ID='+cast(Chan geRequest.ChangeRequest_ID
as nvarchar) +CHAR(34)+'>Open</a></center>',"
I want to invoke a Client side javascript function and pass the value
of the ID. How can I accomplish this such when a user clicks "Open" he
goes to a new window with the same ID.
I tried this but it does not work:
On Server side:
sSql = "SELECT DISTINCT " + "'Action' = '<center><a href= 'javascript:
NewWindow('+cast(ChangeRequest.ChangeRequest_ID as nvarchar)+
CHAR(34)+)'>Open</a></center>',"
On Client side:
function NewWindow(myID)
{
window.open("ChangeRequest.aspx?ID="+myID,"WindowName","width=500,height=600");
}
</script>
On the server side I have a php generated session parameter.
I need to pass it to javascript on the client side page.
I saw on the web the following solution code...
I tried it but it did not work.
I have the following PHP code, which uses server-side validation, which works fine. It the user leaves the text field empty it stores an error in a session array which is outputted on the page where the $_GET['id'] variable came from. I also implemented a snippet of javascript code that just checks to see if the cell is empty and throws up alert box. The problem is that both the javascript code and php error validation are both running when I click submit. The PHP code should be a backup to the javascript code in case the user has javascript turned off. The client-side validation should be the default. Not sure if this change should be made in my PHP Code or Javascript Code.
PHP CODE:
session_start();
require_once("../Modules/Connection_Functions.php");[code].....