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56853.05

Prosty chat w ajax

Na tym prostym kusie pokażę wam jak napisać prosty skrypt chatu w ajax'ie

Listing

1. Stwórz pliki php o podanych niżej nazwach:
-index
-chat
-submit
-refresh
2.Do pliku index.php wpisz:

<?php
require_once("chat.php");
$chat = new chat();
$chat->main();
?>

w pliku chat.php wpisz:

<?php
class chat{
var $host="localhost";
var $user="root";
var $db="chat";
var $pass="";

function connect_easy($query)
{
$b = array();
if(!$connect = mysql_connect($this->host,$this->user,$this->pass));
if(!$dbr = mysql_select_db($this->db));
if(!($result = mysql_query($query)));
@$num = mysql_num_rows($result);
@$num2 = mysql_num_fields($result);
for($x=0;$x<$num;$x++)
{
$a = mysql_fetch_array($result);
for($i=0;$i<$num2;$i++)
{
$b[$x][$i] = html_entity_decode($a[$i]);
}
}
return $b;
}

function show($a){
if(count($a)>0){
$a=array_reverse($a);
if(count($a)<9)
$end=count($a);
else
$end=9;
for($i=0;$i<$end;$i++){
echo "<p><font size=2 color=red>".$a[$i][0]."</font>: ".$a[$i][1]."</p>";
}
}
}
function main(){
session_start();
echo '<html><head><script language="JavaScript">
function createRequestObject(){
var request_;
var browser = navigator.appName;
if(browser == "Microsoft Internet Explorer"){
request_ = new ActiveXObject("Microsoft.XMLHTTP");
}else{
request_ = new XMLHttpRequest();
}
return request_;
}

var http = new Array();
var http2 = new Array();

function getInfo(){

var curDateTime = new Date();
http[curDateTime] = createRequestObject();

http[curDateTime].open(\'get\', \'refresh.php\');

http[curDateTime].onreadystatechange = function(){
if (http[curDateTime].readyState == 4)
{
if (http[curDateTime].status == 200 || http[curDateTime].status == 304)
{
var response = http[curDateTime].responseText;
document.getElementById(\'view_ajax\').innerHTML = response;
}
}
}

http[curDateTime].send(null);
}

function getInfo2(){
var curDateTime = new Date();
http2[curDateTime] = createRequestObject();
http2[curDateTime].open(\'get\', \'submit.php?chat=\'+ document.ajax.chat.value);
http2[curDateTime].send(null);
}

function send(){
getInfo2();
document.ajax.chat.value=" ";
}

function go(){
getInfo();
window.setTimeout("go()", 2000);
}

</script>
</head><body onLoad="go()"><center>
<div id="view_ajax" style="overflow=auto; width: 500px; height: 300px; border: 1px;" align="left">
</div><br><form action="JavaScript: send()" method="get" name="ajax">
<input type="text" name="chat"> <input type="button" value="OK" onClick="send()">
</form></center>
</body></html>';
}
}

Do pliku submit.php wpisz:

<?php
session_start();
require_once("chat.php");
$submit = new chat();
$query="insert into chat values ('".session_id()."','".$_GET["chat"]."','000000',NOW())";
$submit->connect_easy($query);
?>

Do pliku refresh.php wpisz:

<?
session_start();
require_once("chat.php");
$refresh = new chat();
require_once("chat.php");
$query="select * from chat";
$a=$refresh->connect_easy($query);
$refresh->show($a);
?>