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Simple Text Chat Box Learn how to use a simple idea to make text chat web application Rate Topic: ****- 3 Votes

#106 DGirro  Icon User is offline

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Posted 10 January 2013 - 10:28 AM

View Postahmad_511, on 09 January 2013 - 07:02 PM, said:

Hello,
by looking to the text you quoted I guess you're using the old chat version,
please check out the latest version of the code posted here Chat box 6

Quote

how you can control number of lines generated in onlineusers.txt which become very huge too ?

this was a bug/limitation in the old version but fixed in the new one by cleaning up users exceeding the specified inactivity period

Quote

And is it necessary to have all this empty lines in onlineusers.txt & room1.txt ?

I'm not sure what you're referring to but if you're seeing empty lines, feel free to delete them, again I didn't experience such thing in the new version

I really recommend you to have a look at the new code since it has a lot more features, easier to integrate/configure and easier to customize (check the documentations link)

I hope it helps


Thanks for your answer and sure your new chat is great BUT

- I'm looking for a very simple chat like this old version but with this blocking issue of empty lines filled in the .txt files, an idea to fix it in this old version ?
- And I'm not able to migrate my website to PHP version 5 and the new version that you propose is broken deployed on my server with PHP 4.4.3 version in prerequiste. An idea ?

Thanks in advance !
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#107 kalaishiva  Icon User is offline

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Posted 30 January 2013 - 10:32 PM

View Postahmad_511, on 01 March 2008 - 06:41 AM, said:

Hello and welcome.

In this tutorial we will learn about the basics of text chat.
And to do that, we will use a simple idea for text chat box routines.

Before you start:
We will use multiple programming languages in this tutorial, so please make sure before you start that you know:
1-The basics of HTML elements and Objects.
2-The basics of CSS to create a simple layout for the chat box elements.
3-Intermediate skills in Javascript to control all the chat box functionality (client side).
4-Intermediate skills in php to process incoming and outgoing information (server side).

And we will use an Ajax script to create a connection between the Server and Clients.
So I will use Ajax snippet I posted here before.
And that Ajax snippet will allow you to call another function when the server responses.

Now letís get into work:
What are the procedures to accomplish a basic chat?

To do List:
- Create the user interface.
- Style user interface.
- Coding Client/Server.

Creating user interface :(index.htm)
Within the documentís body we need to add:
1-Form for Sign-in / Sign-out operations and letís give it an id and set it to "signInForm"
Inside that form create the following elements and give it the associated id
Element id
---------- --
Textbox "userName"
Submit button "signInButt"
Span "signInNmae"

Now, since I decided to use the same button for signing in and out I will give that button a name and I will change it accordingly.
Thatís why Iíll give the submit button a name="signIn" as initial value.

2-Div element to view the messages, give it id="chatBox"
3-Div element to show currently online users, give it id ="usersOnLine".
4-Another Form to handle message submitting, give it id ="messageForm" that contains the following elements:

Element id
---------- --
Textbox "message"
Submit button "send"
Div "serverRes"


<html>

<head>
<title>DIC ChatBox Beta 1</title>
</head>

<body>

<h1></DIC> Chat Box</h1>
<form id="signInForm">
	<input id="userName" type="text">
	<input id="signInButt" name="signIn" type="submit" value="Sign in">
	<span id="signInName">User name</span>
</form>

<div id="chatBox"></div>

<div id="usersOnLine"></div>

<form id="messageForm">
	<input id="message" type="text">
	<input id="send" type="submit" value="Send">
<div id="serverRes"></div>
</form>
</body>
</html>


Thatís all elements we need, letís save our HTML document as "index.htm".

Creating the style sheet: (cb_style.css)
Letís make it simple and clean so everyone else can edit it easily.
We will style each element depending on its id

Here is the CSS we need, itís very simple so no need to add any comment
#signInForm, #messageForm {
	margin:0px;
	margin-bottom:1px;
}
#userName {
	width: 150px;
	height: 22px;
	border: 1px teal solid;
	float:left;
}
#signInButt {
	width: 60px;
	height: 22px;
}	
#signInName{
	font-family:Tahoma;
	font-size:12px;
	color:orange;
}
#chatBox {
	font-family:tahoma;
	font-size:12px;
	color:black;
	border: 1px teal solid;
	height: 225px;
	width: 400px;
	overflow: scroll;
	float:left;

}
#usersOnLine{
	font-family:tahoma;
	font-size:14;
	color:orange;
	border:1px teal solid;
	width:150px;
	height:225px;
	overflow:scroll;
	margin-left:1px;
}
#message {
	width: 350px;
	height: 22px;
	border: 1px teal solid;
	float:left;
	margin-top:1px;
}
#send {
	width: 50px;
	height: 22px;
	float:left;
	margin:1px;
}
#serverRes{
	width:150px;
	height:22px;
	border: 1px teal solid;
	float:left;
	margin:1px;
}



Save that style as "cb_style.css" to same directory where we saved the index.htm before.

Now, we need to link the index.htm with cb_style.css.
At the documentís header part add this code

<link rel="stylesheet" type="text/css" href="cb_style.css">



Take a look at the screen shot it must be similar, if not please make sure that you typed the previous code correctly.
Attachment attachment
After we finished working on the HTML elements and the style weíll work on coding these elements to do what it has to do.

Coding:
In this part we will code the client side in javascript and the server side in php

As everybody knows there are 4 basic procedures in every text chat application which are:
1- Signing in 2- Sending messages 3- Updating userís data 4- Signing out
And of course we need some interface to transfer the data between the client and the server

Here I will use XMLHTTP request which is known as AJAX

I'm not going to talk about Ajax and how it works, so I will use an old snippet of Ajax that I posted here.

I will just mention its syntax
To send data we just call the Ajax function, give it the sending method("GET"/"POST"),"the requested URL","data as name=value pairs",the function handler that will receive the server response)
Ajax_Send("POST","my_url","name1=ahmad&name2=511",reponseFunc);


Save the snippet in the same directory and rename it to "ajax.js"
So letís link this snippet to the index.htm like this:
In the document header add this code
<script type="text/javascript" src="ajax.js"></script>



Client side: (chatBox.js / hideShow()): Function
First create the function "hideShow(hs)" that will control signInForm and messageFrom visibility
We need to pass a string parameter to show/hide forms accordingly.
By default we want the messageForm to be hidden, thatís so we need to pass the function "show" as parameter that will hide the signInForm and show the messageForm
The name/value attributes of signInButt and the signInName will change too.

And when we pass it "hide" the things will go reverse
Open a new text document and type our hideShow() function

function hideShow(hs){
if(hs=="hide"){
signInForm.signInButt.value="Sign in"
signInForm.signInButt.name="signIn"
messageForm.style.display="none"
signInForm.userName.style.display="block"
signInName.innerHTML=""
}
if(hs=="show"){
signInForm.signInButt.value="Sign out"
signInForm.signInButt.name="signOut"
messageForm.style.display="block"
signInForm.userName.style.display="none"
signInName.innerHTML=signInForm.userName.value 
}
}



Save the file as "chatbox.js" to the same directory we already working in
Open the index.htm file and link "chatbox.js" to it by adding this code in the documentís header
<script type="text/javascript" src="chatbox.js"></script>


As we said before we need the meesageForm to be hidden by default so edit the body tag to call hideShow() function to hide the messageForm on bodyís load event like this
<body onload="hideShow('hide')">



Create two empty text files:
"onlineusers.txt" will store the already signed in users
"room1.txt" will store the recently sent messages (last 20 in our case)
Make sure that the tow files are having write permission.

Notes:
Take a look at the flowchart in each procedure, it will give you a better understanding about how things are goes.

Part#1: Singing in
Attachment attachment

Client side: (chatbox.js / signInOut()): Function
User will enter the user name he want and hit [signInButt] which has "signIn" as nameís value right now
The [signInForm] form will call the function [signInOut()] on submit event and exit.
[signInOut()] function will validate the user name for existing spaces (you can add any validation rules at this part.

The function will check the [signInButt] name if itís equal to "signIn" (which already is)
If so, collect the user name and the sign in operation as name=value pairs
Send the data to server-side script "users.php" and let the Ajax to call [checkSignIn] function on server response.
Exit the function
// Sign in and Out
function signInOut(){
// Validation
if (signInForm.userName.value=="" || signInForm.userName.value.indexOf(" ")>-1){
alert("Not valid user name\nPlease make sure your user name didn't contains a space\nOr it's not empty.");
signInForm.userName.focus();
return false;
}

// Sign in
if (signInForm.signInButt.name=="signIn"){
data="user=" + signInForm.userName.value +"&oper=signin"
Ajax_Send("POST","users.php",data,checkSignIn);
return false
}
}



Server side: (users.php)
users.php will load the "onlineusers.txt" file to $onlineusers_file using built in (file) function which will converts the file to an array
Check if the client sent the user and the oper variables
If so, search the $onlieusers_file if the sent user name is exist, if so get the user index
If the operation is "signin" and user is not exist, add this user to $onlineusers_file array
Call the function [saveUsers()] to save the changes.
Send the "signin" string to the client and exit

If the user is exist send the "userexist" string to the client and exit

The [saveUsers()] function will receive an array
Open the onlineusers.txt file for over writing
Lock the file
Write the array elements with linefeed character
Unlock the file
Close the file
function saveUsers($onlineusers_file){
$file_save=fopen("onlineusers.txt","w+");
flock($file_save,LOCK_EX);
for($line=0;$line<count($onlineusers_file);$line++){
fputs($file_save,$onlineusers_file[$line]."\n");
};
flock($file_save,LOCK_UN);
fclose($file_save);
}

$onlineusers_file=file("onlineusers.txt",FILE_IGNORE_NEW_LINES);
if (isset($_POST['user'],$_POST['oper'])){
$user=$_POST['user'];
$oper=$_POST['oper'];
$userexist=in_array($user,$onlineusers_file);
if ($userexist)$userindex=array_search($user,$onlineusers_file);

if($oper=="signin" && $userexist==false){
$onlineusers_file[]=$user;
saveUsers($onlineusers_file);
echo "signin";
exit();
}

if($oper=="signin" && $userexist==true){
echo "userexist";
exit();
}
}



After the user.php sent the data, the Ajax will detect server response and execute the function we specified [checkSignIn()]

Client side: (chatbox.js / checkSignIn()) Function:
The function will read the server response text (res)
If the server response is "userexist" the function will alert the user to change his sign in name
If response text is equal to "signin" that means the user name was accepted and itís ready to use
Call [hideShow()] function to hide the [signInForm] and show the [messageForm]
And the [hideShow()] function now will set the name of the [signInButt] to "signOut" and its value to "Sign out" to be used in signing out procedure
Create an interval [updateIntrerval] to call each 3 seconds a new function we will create later [updateInfo()] which will handle the update of online users and sent messages.
Show "Sign in" notification in the [serverRes] DIV
// Sign in response
function checkSignIn(res){
if(res=="userexist"){
alert("The user name you typed is already exist\nPlease try another one");
return false;
}
if(res=="signin"){
hideShow("show")

messageForm.message.focus()
updateInterval=setInterval("updateInfo()",3000);
serverRes.innerHTML="Sign in"
}
}



Part#2: Sending messages
Attachment attachment

Client side: (chatbox.js / sendMessage()) Function
The user types a message in the [message] text box and hit [send] button
The form submit event will call the [sendMessage()] function
The function will collect the user name and the message in one string as name=value pairs
Use Ajax to send the data to "send.php" script on the server and call the function [sentOk] when server response

// Send message
function sendMessage(){
data="message="+messageForm.message.value+"&user="+signInForm.userName.value
serverRes.innerHTML="Sending"
Ajax_Send("POST","send.php",data,sentOk)
}



Server side: (send.php)
send.php receives the message and strips the HTML/PHP tags and slashes right away
Receives the user too
Load the room1.txt file into $room_file and convert it to array using built in(file) function.
Create a new array element that contain the server time at the beginning, the string "<!@!>" as separator, the user name , ": " and the message
Note: "<!@!>" has no meaning, itís just a string we think that it will never occurs in the messages and we will use it again to separate the server time from the messages

Check if the $room_file array elementís count is greater than 20(last 20 recently sent messages), when itís true remove the first elements in the array (the oldest message), and thatís will work just like a buffer for the sent messages

Note:
The number (20) means that the maximum number of messages that the client can receive in each update is 20
So maximizing this number will provides more messages buffer size

Anyway, send.php will open the "room1.txt" file for over writing now
Lock the file
Write the arrayís elements with line feed character
Unlock the file
Close the file
Send "sentok" string to the client which will be received by [sentOk()] function that will execute on server response.
Exit
$message=strip_tags($_POST['message']);
$message=stripslashes($message);
$user=$_POST['user'];

$room_file=file("room1.txt",FILE_IGNORE_NEW_LINES);

$room_file[]=time()."<!@!>".$user.": ".$message;
if (count($room_file)>20)$room_file=array_slice($room_file,1);
$file_save=fopen("room1.txt","w+");
flock($file_save,LOCK_EX);
for($line=0;$line<count($room_file);$line++){
fputs($file_save,$room_file[$line]."\n");
};
flock($file_save,LOCK_UN);
fclose($file_save);
echo "sentok";
exit();


Save the file as "send.php" to the same directory we are working in

Client side: (chatbox.js / sentOk()) Function
The function check if the response text is "sentok"
If so, clear the [message] text box value
Set the focus the [message] text box
Show the notification "Sent" in the [serverRes] DIV

If the server response is not equals to "sentok" the function will show "Not sent" in the [serverRes] DIV
// Sent Ok
function sentOk(res){
if(res=="sentok"){
messageForm.message.value=""
messageForm.message.focus()
serverRes.innerHTML="Sent"
}
else{
serverRes.innerHTML="Not sent"
}
}



Part#3: Updating userís data
Here we have two types of the data we need to update (online users and the messages)
If you still remember, we create the [updateInterval] after sign in procedure done, and this interval will call the [updateInfo()] function every 3 seconds

Client side: (chatbox.js / updateInfo()) Function
Show the "Updating" string in the [serverRes] DIV
Use Ajax to call "user.php" script on server with no data to send and direct it to call [showUsers()] function on server response
Use Ajax to call "receive.php" on the server and send the variable lastReceived then call [showMessages()] function on server response

Now before we write this function we need to define the lastReceived variable out side the function making it have a global scope which will allow us to change/read its value from within [updateInfo()] and [showMessages()] functions
And maybe you will use it as a counter for the received messages
So at the top part of [chatbox.js] and outside any function letís add this:
lastReceived=0



And here is the function
// Update info
function updateInfo(){
serverRes.innerHTML="Updating"
Ajax_Send("POST","users.php","",showUsers)
Ajax_Send("POST","receive.php","lastreceived="+lastReceived,showMessages)
}



Updating online users:
Attachment attachment

Server side: (users.php)
When the user.php receives nothing from the client it will load the onlineuser.txt file to $onlineusers_file array
Join that array with the string "<br>" and then send the joined array to the [sowUsers()] function on the clientís machines

Open the users.php file and add these two lines to it (at the bottom)
$olu=join("<br>",$onlineusers_file);
echo $olu;


Save the file

Client side: (chatbox.js / showUsers()) Function
This function will receive the online-users joined array from the server and display it as it is inside the [usersOnLine] DIV
// update online users
function showUsers(res){
usersOnLine.innerHTML=res
}



Updating messages:
Attachment attachment

Server side: (receive.php)
receive.php will receive the lastreceived variable from the client and assign it to $lastreceived
Load the room1.txt file to $room_file array
Loop all over the array elements
Read each element and split the server time from the message (using the "<!@!>" string we added before) to $messageArr
Now the message time is $messageArr[0] and the username with the message is $messageArr[1]
Check if the message time > $lastreceived then send this message with HTM line break tag to the client because he didnít receive it yet. (Depending on the lastreceived time the client sent)
After loop is done, send "<SRVTM>" string and the $messageArr[0] (which is now carry the last messageís time) to the client

Note: the string "<SRVTM>" has no meaning, we will just use it to separate the messages from the last message received time
$lastreceived=$_POST['lastreceived'];
$room_file=file("room1.txt",FILE_IGNORE_NEW_LINES);
for($line=0;$line<count($room_file);$line++){
$messageArr=split("<!@!>",$room_file[$line]);
if($messageArr[0]>$lastreceived)echo $messageArr[1]."<br>";
}
echo "<SRVTM>".$messageArr[0];


Save the file as "receive.php" to the same directory we are working in.

Client side: (chatbox.js / showMessages()) Function
The function will receive a string with all messages connected together with "<br>" and the last element is the last message time and itís connected with "<SRVTM>"
First, we will clear the [serverRes] DIV
Then we split the last received time from the messages into msgTmArr array using the string "<SRVTM>"
Now we have array with two elements:
msgTmArr[0] contains all none received yet messages
msgTmArr[1] contains the last messageís time that delivered to the client

Now Assign the msgTmArr[1] to lastReceived variable (that we defined it before),so we will use it again in the next [updateInfo()] call
Create a new HTML span element to contain the received messages
Insert the msgTmArr[0] in the Span inner html
Append the span to the [chatbox] DIV
Update the [chatbox] DIV vertical scroll bar to show the last inserted line
// Update messages view
function showMessages(res){
serverRes.innerHTML=""
msgTmArr=res.split("<SRVTM>")
lastReceived=msgTmArr[1]
messages=document.createElement("span")
messages.innerHTML=msgTmArr[0]
chatBox.appendChild(messages)
chatBox.scrollTop=chatBox.scrollHeight
}



Part#4: Signing out
Attachment attachment

Client side: (chatbox.js / signInOut()) Function
User click on the singInButt (its value now is "Sign out" and its name is "signOut")
The [signInForm] will call the [signInOut()] function and now the signInButt has the name "signOut"
The function will check the user name validation. (The validation is useless here because the user is passed this validation when he signed in)
The function will check if the signInButt name is equals to "signOut"
Collect user and oper data
Send the data using Ajax to users.php and tell Ajax to execute [checksignOut()] function on server response

Inside the [signInOut()] function and just before closing brackets add this code:
// Sign out
if (signInForm.signInButt.name=="signOut"){
data="user=" + signInForm.userName.value +"&oper=signout"
Ajax_Send("POST","users.php",data,checkSignOut);
return false
}



Server side: (users.php)
users.php will load the onlineusers.txt file to $onlineusers_file array
Receive the user and oper variables from the client
Search the array if the user exists; if so get its index
Check if the oper is equals to "signout" and the user is exist
If so, splice the user from the array
Send "signout" string to the client
Exit
If the user not exists send "usernotfound" to the client and exit.

Open the users.php file and add this code after the part of the sign in procedure (before the closing bracket of (if isset) statement)
So if the sign in and out check failed, we will then join the array and send it back to the client

if($oper=="signout" && $userexist==true){
array_splice($onlineusers_file,$userindex,1);
saveUsers($onlineusers_file);
echo "signout";
exit();
}

if($oper=="signout" && $userexist==false){
echo "usernotfound";
exit();
}



Client side: (chatbox.js / checkSignOut())
The [checkSignOut()] function reads the server response and if itís equals to "usernotfound" show "Sign out error" in the [serverRes] DIV and change the response text to "signout"
If the server response text is equals to "signout", hide the [messageForm] and show the [signInForm]
Clear the updateInterval
Show "Sign out" string in [serverRes] DIV
Note: the [hideShow()] function will rename the signInButt to "signIn" and chage its value to "Sign in" too
Exit
// Sign out response
function checkSignOut(res){
if(res=="usernotfound"){
serverRes.innerHTML="Sign out error";
res="signout"
}
if(res=="signout"){
hideShow("hide")
signInForm.userName.focus()
clearInterval(updateInterval)
serverRes.innerHTML="Sign out"
return false
}
}



One other thing we have to do
If the user leave the site he must sign out automatically, thatís so we will call the [signInOut()] function on unload or on beforeunload event
And to do that we have to change the [signInButt] name to"signOut" then we call the function [signInOut()]
Edit the documentís body tag to be like this:
<body onbeforeunload="signInForm.signInButt.name='signOut';signInOut()" onload="hideShow('hide')">



And thatís all

You must have now 9 files:
1-ajax.js
2-chatbox.js
3-index.htm
4-cb_style.css
5-users.php
6-send.php
7-receive.php
8-onlineusers.txt
9-room1.txt

Again make sure that you have write permission on the onlineusers.txt and room1.txt

Upload those files and brows index.htm

Note:
This tutorial is based on a simple idea and itís for learning purposes only
And it needs more enhancements before you can use it for real work. (adding user registration, administrators control panel, more validation rules,Ö)

Now I guess you can edit that code to make it use multiple chat rooms.

I hope it helps somebody to get the basics of text chat.

Download all files here Attachment attachment

Any suggestions or comments are appreciated.

Regards

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#108 josh0036  Icon User is offline

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Posted 16 February 2013 - 12:41 AM

i downloaded and uploaded chatbox6 but still not working on my website
http://dcenter.comli.com/lab/
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#109 ahmad_511  Icon User is offline

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Posted 16 February 2013 - 02:59 AM

Hi Josh,
I took a quick look to your website and noticed the following warning message in chrome's console window:

Quote

Resource interpreted as Script but transferred with MIME type text/html: "http://stats.hosting24.com/count.php".

so, I switched the developer tools to the Network tab and refresh your site
Clicked on the server.php request and then clicked the Response tab to see what confirms the warning message appeared in the console
the following code was automatically attached to the response (it seems that your hosting company is trying to collect some statistics about the site)
<!-- Hosting24 Analytics Code -->
<script type="text/javascript" src="http://stats.hosting24.com/count.php"></script>
<!-- End Of Analytics Code -->


this is what corrupts the parsing of the server response

it's maybe better to find another hosting company,
anyways, if you want to workaround this, you can adjust the ajax.js file so it removes the extra added code before trying to parse the response as JSON (right before line 115 in ajax.js file)

the problem here is the hosting company may change the code they attached to the response which requires you to adjust the ajax.js once again to remove the new code
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#110 Darkvortex  Icon User is offline

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Posted 25 February 2013 - 04:14 AM

Hi bro, i have try this tutorial & its really good working.thanks for this tutorial.
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#111 ahmed mostafa  Icon User is offline

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Posted 18 April 2013 - 01:23 PM

[code] please send mee the simple array that i can writ it in the onlineusers.txt &room1.txt
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#112 ahmad_511  Icon User is offline

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Posted 18 April 2013 - 03:44 PM

View Postahmed mostafa, on 18 April 2013 - 10:23 PM, said:

[code] please send mee the simple array that i can writ it in the onlineusers.txt &room1.txt


You don't need to write anything to these files, they should be handled from within the script (unless you're facing a bug), just make sure they have a write permission

if you are using the old version, I recommend you to use the latest one which seems working fine so far (ChatBox6)
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#113 josh0036  Icon User is offline

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Posted 22 May 2013 - 11:07 AM

Hi
ahmad_511

I change my company web host but still i facing a problem.
Check it here www.countlessfun.com
There is an error on checking status bar
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#114 ahmad_511  Icon User is offline

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Posted 22 May 2013 - 01:55 PM

Hello,
check this
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This post has been edited by ahmad_511: 22 May 2013 - 01:57 PM

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#115 josh0036  Icon User is offline

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Posted 22 May 2013 - 08:01 PM

View Postahmad_511, on 22 May 2013 - 01:55 PM, said:

Hello,
check this
Attachment Forbidden.png


Thank you so much. It helps me a lot because i preferrred html code only and it is hard for me to debug php code
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#116 josh0036  Icon User is offline

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Posted 22 May 2013 - 08:59 PM

I already resolved the issue about Error 403 but after that I recieved Error 500
ajax.js line: 152

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#117 josh0036  Icon User is offline

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Posted 22 May 2013 - 09:24 PM

Wow! I dont Really dont known how I can resolved this problems all by myself
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#118 ahmad_511  Icon User is offline

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Posted 23 May 2013 - 04:10 AM

Hello again,
it seems you have a problem executing php files (I tried to call some of them and got the same error code,

so, in order to figure out, please try to put a simple php file on your server that echo anything and then call it from your web browser
see if you can get a response, if not check the file permissions

if it's not a file permission what causes this, it's maybe a server configuration issue
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#119 hasan1998  Icon User is offline

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Posted 23 May 2013 - 05:01 AM

Hi Ahmad
I want to make the username invisible to users, so they can only see the display name, how to do that?
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#120 hasan1998  Icon User is offline

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Posted 23 May 2013 - 06:19 AM

Hi ahmad, forget about the previous post, i have one question: How to edit the text that appears when i move the mouse over images???
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