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A simple ASP + Ajax chat room (1)

Source: Internet
Author: User
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Use ASP + ajax to create a simple chat room. Send messages first today.

Front-end code:

 

<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> chat room with no questions </title>
<SCRIPT type = "text/JavaScript" src = "chat. js"> </SCRIPT>
<Style type = "text/CSS">
<! --
. Chat {border: #666666 1px solid; display: block; margin-left: 5px; margin-Right: 5px; Height: 680px; padding: 10px ;}
-->
</Style>
</Head>

<Body>
<H3> none Chat Room <Div id = "chat" class = "chat">
<! -- The Chat information is displayed here -->
</Div>
<Form ID = "frmsend" name = "frmsend" onsubmit = "sendmess (); Return false;">
<Input name = "username" type = "text" id = "username" value = "no question" size = "10"/>
<Input name = "mess" type = "text" id = "mauto" size = "100"/>
<Input type = "Submit" value = "send" id = "submitsend" name = "submitsend"/>
</Form>
</Body>
</Html>

 

JS Code chat. JS:

 

// Create an XMLHTTPRequest object by encapsulating the getajax () method
Function getajax ()
{
VaR Ajax = false;
Try {
Ajax = new activexobject ("msxml2.xmlhttp ");
} Catch (e ){
Try {
Ajax = new activexobject ("Microsoft. XMLHTTP ");
} Catch (e ){
Ajax = false;
}
}
If (! Ajax & typeof XMLHttpRequest! = 'Undefined '){
Ajax = new XMLHttpRequest ();
}
Return Ajax;
}

VaR getmessreq = getajax (); // gets the XMLHTTPRequest object of the message.
VaR sendmessreq = getajax (); // XMLHTTPRequest object for sending messages

// Message sending Method
Function sendmess ()
{
// If the message is empty, a prompt is returned.
If (document. getelementbyid ("mess"). value = ""){
Alert ("You have not entered a message! ");
Return;
}

// Determine the status of the last message sent, 4: Sent, 0: not sent
If (sendmessreq. readystate = 4 | sendmessreq. readystate = 0 ){
// The server address for sending the message
VaR sendurl = "send. asp? Username = "+ escape (document. getelementbyid (" username "). Value) +" & mess = "+ escape (document. getelementbyid (" mess "). value );
Sendmessreq. Open ("Post", sendurl, true); // create a request connection
Sendmessreq. onreadystatechange = function () {// method called after the sending status changes
// Some code will be written tomorrow
}

Sendmessreq. Send (null); // send the request
Document. getelementbyid ("mess"). value = ""; // set the message box to null.
}
}

 

Send. asp:

 

<% @ Language = "VBScript" codePage = "65001" %>
<! -- # Include file = "conn. asp" -->
<%
Dim username, mess
Username = trim (request. querystring ("username "))
Mess = trim (request. querystring ("mess "))
Conn.exe cute ("insert into message (messtext, username) values ('" & mess & "', '" & username &"')")
Conn. Close () set conn = nothing %>

 

Data Table: Message

Note: Set a default value for the date field: getdate ()

Please wait here. I will write the message display part tomorrow. It's time to go to bed.

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