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Jquery processes XML instances

Source: Internet
Author: User
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<! 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>

<Title>
</Title>

<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8">

<Style type = "text/CSS">
Body {margin: 0; padding: 0; font-size: 12px;} # messagewindow {Height: 250px; Border: 1px solid; padding: 5px; overflow: auto ;} # wrapper {margin: auto; width: 438px ;}
</Style> <! -- Introduce jquery --> <SCRIPT type = "text/JavaScript">
// <! [CDATA [
$ (Function (){
// Define the timestamp
Timestamp = 0;
// Call the information update function
Updatemsg ();
// Form submission
$ ("# Chatform"). Submit (function (){
$. Post ("backend. php ",{
Message: $ ("# MSG"). Val (),
Name: $ ("# Author"). Val (),
Action: "postmsg ",
Time: Timestamp
}, Function (XML ){
// Clear the content of the information text box
$ ("# MSG"). Val ("");
// Call the function for parsing XML
Addmessages (XML );
});
Return false; // block form submission
});
});
// Information update function, which reads data from the server at a specified time
Function updatemsg (){
$. Post ("backend. php", {time: Timestamp}, function (XML ){
// Remove wait prompt
$ ("# Loading"). Remove ();
// Call the function for parsing XML
Addmessages (XML );
});
// Read every 4 seconds.
SetTimeout ('updatemsg () ', 4000 );
}
// Parse the XML document function and display the data to the page
Function addmessages (XML ){
// Terminate if the status is 2
If ($ ("status", XML). Text () = "2") return;
// Update the timestamp
Timestamp = $ ("time", XML). Text ();
// $. Each cyclic data
$ ("Message", XML). Each (function (){
VaR author = $ ("author", this). Text (); // publisher
VaR content = $ ("text", this). Text (); // content
VaR htmlcode = "<strong>" + author + "</strong>:" + content + "<br/> ";
$ ("# Messagewindow"). prepend (htmlcode); // Add it to the document
});
}
//]>

</SCRIPT>

</Head> <body>

<Div id = "wrapper">

<P id = "messagewindow">

<Strong>
$ Message [user]
</Strong>

: $ Message [MSG]
<Br>

<Strong>
$ Message [user]
</Strong>

: $ Message [MSG]
<Br>

<Strong>
$ Message [user]
</Strong>

: $ Message [MSG]
<Br>

<Strong>
$ Message [user]
</Strong>

: $ Message [MSG]
<Br>
</P> <Form ID = "chatform" Action = "#">
Name:
<Input id = "author" size = "50" type = "text">
<Br>
Content:
<Input id = "MSG" size = "50" type = "text">
<Br>
<Input value = "send" type = "Submit">
<Br>
</Form>

</Div>

</Body>

</Html>

<? PHP
// Configuration information:
// 1. database connection details
// 2. Number of messages to be stored
// 3. The number of messages displayed when the user enters the chat room
$ Dbhost = "localhost ";
$ Dbuser = "root ";
$ Dbpass = "root ";
$ Dbname = "chat ";
$ Store_num = 10;
$ Display_num = 10;

// Error Report
Error_reporting (e_all );

// Header information
Header ("Content-Type: text/XML ");
Header ("cache-control: No-Cache ");

// Connect to MySQL
$ Dbconn = mysql_connect ($ dbhost, $ dbuser, $ dbpass );
Mysql_select_db ($ dbname, $ dbconn );

// For easy operation of request data, we set a variable for each parameter in the request. Each variable will take the parameter value in the request as its own value.
// The foreach statement traverses all post data, creates a variable for each parameter, and assigns a value to it
Foreach ($ _ post as $ key => $ value ){
$ Key = mysql_real_escape_string ($ value, $ dbconn );
}

// Screen out any error message to determine whether the action is postmsg
If (@ $ action = "postmsg "){
// Insert data
Mysql_query ("insert into messages ('user', 'msg ', 'time ')
Values ('$ name',' $ message', ". Time ().") ", $ dbconn );
// Delete data (because we store 10 data records by default)
Mysql_query ("delete from messages where ID <= ".
(Mysql_insert_id ($ dbconn)-$ store_num), $ dbconn );
}

// Query data
$ Messages = mysql_query ("Select User, MSG
From messages
Where time> $ time
Order by ID ASC
Limit $ display_num ", $ dbconn );
// Whether a new record exists
If (mysql_num_rows ($ messages) = 0) $ status_code = 2;
Else $ status_code = 1;

// Return the XML Data Structure
Echo "<? XML version =/"1.0/"?> /N ";
Echo "<response>/N ";
Echo "/T <status> $ status_code </status>/N ";
Echo "/T <time>". Time (). "</time>/N ";
If ($ status_code = 1) {// if there is a record
While ($ message = mysql_fetch_array ($ messages )){
$ Message ['msg '] = htmlspecialchars (stripslashes ($ message ['msg']);
Echo "/T <message>/N ";
Echo "/T <author> $ message [user] </author>/N ";
Echo "/T <text> $ message [MSG] </text>/N ";
Echo "/T </message>/N ";
}
}
Echo "</response> ";

?>


Generated XML file !!

<? XML version = "1.0" encoding = "UTF-8"?>
<Response>
<Status> 1 </status>
<Time> 1170323512 </time>
<Message>
<Author> Zhang San </author>
<Text> sofa! </Text>
</Message>
<Message>
<Author> Li Si </author>
<Text> bench! </Text>
</Message>
</Response>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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