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ASP CODE

Free Simple Database Driven Chat program by Adrian Forbes
By: Adrian Forbes
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    2003-01-01

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    I've noticed a few people request to do a chat app from ASP so I've knocked one up. I see you've already got a chat ASP script (from FailSafe),
    Anyway, feel free to add this code straight to your site, it's not that feature rich but it demonstrates the kind of things you need to do. 

    It does not require a login but instead keeps a track of active users based on all the people who have posted within a certain timeframe. There are two options you can configure, how many minutes to keep active users and how many posts to be shown on screen. The main chat area shows you who posted what, at what time and what IP address they posted from, and it also shows a list of active users.   It's nice and simple and includes the code to create the database and I've even commented the page that does all the work (although documentation is not my strong point!)

    Menu.asp

    <%@ Language=VBScript %>
    <HTML>
    <HEAD>
    <META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
    </HEAD>
    <BODY>
    <!-- Author: Adrian Forbes -->

    <p>
    <a href="createdb.asp">Create the database</a><br>
    <a href="config.asp">Configure the parameters</a><br>
    <a href="chat.asp">Chat</a><br>
    </p>

    </BODY>
    </HTML>

    CreateDB.ASP

    <%@ Language=VBScript %>
    <HTML>
    <HEAD>
    <META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
    </HEAD>
    <BODY>
    <!-- Author: Adrian Forbes -->

    <%
    sConnect = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath ("/examples/test.mdb") & ";"
    set objRS = CreateObject("ADODB.Recordset")
    sSQL = "CREATE TABLE chat (ID int identity, strText memo not null, strUser varchar(50) not null" & _
    sSQL = " strIP varchar(15) not null, dtDatePosted datetime not null)"
    objRS.Open sSQL, sConnect

    sSQL = "CREATE TABLE chatuser (strUser varchar(50) not null, dtLastPosted datetime not null)"
    objRS.Open sSQL, sConnect

    set objRS.ActiveConnection = nothing
    set objRS = nothing

    Application.Lock
    Application("MaxMessages") = 10
    Application("ActiveTime") = 5
    Application.UnLock

    %>

    <p>Database created.</p>
    <p><a href="menu.asp">Back to menu</a></p>
    </BODY>
    </HTML>

    Config.asp

    <%@ Language=VBScript %>
    <%
    sMax = trim(Request.Form("txtMax"))
    sActive = trim(Request.Form("txtActive"))

    if isnumeric(sMax) then
    Application.Lock
    Application("MaxMessages") = Clng(sMax)
    Application.UnLock
    end if

    if isnumeric(sActive) then
    Application.Lock
    Application("ActiveTime") = Clng(sActive)
    Application.UnLock
    end if
    %>
    <HTML>
    <HEAD>
    <META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
    </HEAD>
    <BODY>
    <!-- Author: Adrian Forbes -->

    <p>
    <form action="config.asp" method=post>
    <table border=0>
    <tr>
    <td>Max number of messages</td><td><input type=text name=txtMax value="<%=Application("MaxMessages")%>"></td></tr>
    <td>Time to keep users active (mins)</td><td><input type=text name=txtActive value="<%=Application("ActiveTime")%>"></td></tr>
    </table>
    <p><input type=submit value="Save"></p>
    </form>
    </p>
    <p><a href="menu.asp">Back to menu</a></p>
    </BODY>
    </HTML>

    Chat

    <%@ Language=VBScript %>
    <HTML>
    <HEAD>
    <META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
    </HEAD>
    <BODY>
    <!-- Author: Adrian Forbes -->

    <p>
    <form action="storechat.asp" method=post>
    You Name:<input type=text name=txtName value="<%=Session("UserName")%>" maxlength=50><br>
    <textarea name=txtChat cols=50 rows=3></textarea>
    <br>
    <input type=submit value="Chat">
    </form>
    </p>
    <p>
    Active users: <select size=1>
    <%
    ' Select the list of users from the ChatUsers table
    set objRS = CreateObject("ADODB.Recordset")
    objRS.Open "SELECT strUser FROM chatuser ORDER BY strUser", 
    "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath ("/examples/test.mdb") & ";"
    while not objRS.EOF
    Response.Write "<option>" & objRS("strUser") & vbCRLF
    objRS.MoveNext
    wend
    objRS.Close
    %>
    </select>
    </p>

    <p>
    <%
    ' Select each row form the Chat table
    objRS.Open "SELECT strUser, dtDatePosted, strIP, strText FROM chat ORDER BY dtDatePosted DESC"
    while not objRS.EOF
    Response.Write "<p><b>" & objRS("strUser") & "</b> (at <b>" & FormatDateTime(objRS("dtDatePosted"), 3) & _
    "</b> from IP <b>" & objRS("strIP") & "</b>) said<br>" & vbCRLF
    Response.Write replace(server.HTMLEncode(objRS("strText")), vbCRLF, "<br>") & "</p>" & vbCRLF
    objRS.MoveNext
    wend
    objRS.Close
    set objRS.ActiveConnection = nothing
    set objRS = nothing
    %>
    </p>
    </BODY>
    </HTML>

    StoreChat.asp

    <%@ Language=VBScript %>
    <%
    ' Author: Adrian Forbes

    ' This script performs a number of tasks
    ' 1 Add text to the chat table in the database
    ' 2 Maintain the list of active users
    ' 2.1 Check if user is already active (i.e. do they exist in the ChatUsers table)
    ' 2.2 If they are not active (i.e. a new user) then insert their details into the table
    ' 2.3 If they are active update their record to show that they have just posted
    ' 3 Delete excess messages to ensure that only the configured amount are in the chat table

    ' Get the selected usermae
    sUser = trim(Request.Form("txtName"))

    ' Store it in the session
    Session ("UserName") = sUser

    ' Get the chat text
    sText = trim(Request.Form("txtChat"))

    ' if either the username or chat text are blank then redirect back to chat page
    if len(sUser) = 0 or len(sText) = 0 then
    Response.Redirect "chat.asp"
    end if

    ' set up the constants we are using
    adCmdText = 1
    adVarChar = 200
    adDBTimeStamp = 135
    adParamInput = 1

    ' Open our connection, this will be reused throughout

    set objConnect = CreateObject("ADODB.Connection")
    objConnect.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" &_
     Server.MapPath ("/examples/test.mdb") & ";"
    objConnect.Open

    ' 1 First of all insert our chat text into the database

    set objCommand = CreateObject("ADODB.Command")
    with objCommand
    set .ActiveConnection = objConnect
    .CommandType = adCmdText
    .CommandText = "insert into chat (strText, strUser, strIP, dtDatePosted) values (?, ?, ?, Now())"
    .Parameters.Append .CreateParameter ("strText", adVarChar, adParamInput, len(sText), sText)
    .Parameters.Append .CreateParameter ("strUser", adVarChar, adParamInput, 50, sUser)
    .Parameters.Append .CreateParameter ("strIP", adVarChar, adParamInput, 15, Request.ServerVariables("REMOTE_ADDR"))
    .Execute
    end with
    set objCommand.ActiveConnection = nothing
    set objCommand = nothing

    ' 2.1 Now we have to find out if this user exists in the chatusers table, i.e. are they
    ' already active?

    set objCommand = CreateObject("ADODB.Command")
    with objCommand
    set .ActiveConnection = objConnect
    .CommandType = adCmdText
    ' This will return how many times they exist in the table. 0 means they are new
    ' 1 means they already exist. A user can't exist more than once in this table
    .CommandText = "select count(*) from ChatUser where strUser = '" & sUser & "'"
    set objRS = .Execute
    if objRS(0) = 0 then
    ' 2.2 count is 0 so we have to add this user to the table
    .CommandText = "insert into ChatUser (strUser, dtLastPosted) values (?, Now())"
    else
    ' 2.3 count is not 0 so update this users entry to show that they have just posted
    .CommandText = "update ChatUser set dtLastPosted = Now() where strUser = ?"
    end if
    .Parameters.Append .CreateParameter ("strUser", adVarChar, adParamInput, 50, sUser)
    .Execute
    end with
    set objCommand.ActiveConnection = nothing
    set objCommand = nothing

    ' Now we want to delete all users in the ChatUser table who have not posted within the
    ' configured time limit

    set objCommand = CreateObject("ADODB.Command")
    with objCommand
    set .ActiveConnection = objConnect
    .CommandType = adCmdText
    ' Use the DateDiff function to delete where the difference between now and when they last
    ' posted is > Application("ActiveTime") minutes
    .CommandText = "delete from ChatUser where DateDiff (""n"", dtLastPosted, Now()) > " & Application("ActiveTime")
    .Execute
    end with
    set objCommand.ActiveConnection = nothing
    set objCommand = nothing

    ' 3 Now we want to delete the excess posts

    set objRS = CreateObject("ADODB.Recordset")
    ' Get a list of all posts in descending order
    objRS.Open "SELECT ID FROM chat ORDER BY dtDatePosted DESC", objConnect

    lID = 0
    i = 0
    bExit = false
    ' Loop through each post
    while not objRS.EOF and not bExit
    i = i + 1
    if i = Clng(Application("MaxMessages")) then
    ' The number of posts is bigger than the cofigured limit of Application("MaxMessages")
    ' Get the ID of this record as we want to delete all others
    lID = objRS("ID")
    bExit = true
    end if
    objRS.MoveNext
    wend

    objRS.Close

    ' Check if lID is > 0, if it is then there were more than the configured limit of
    ' messages
    if lID > 0 then
    ' Delete all messages whose ID is less than this ID as they are too far down the list
    objRS.Open "DELETE FROM chat WHERE ID < " & lID
    end if
    set objRS.ActiveConnection = nothing
    set objRS = nothing

    ' Close our connection
    objConnect.Close
    set objConnect = nothing

    Response.Redirect "chat.asp"
    %>


    DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.

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