im currently developing a chat aplication in php to a client using long polling. When the user send msgs i woud .abort() the getmsg() function and restart in on sendmsg() sucess (ajax call), but if the user send repeatedly msgs, the getmsg() get fired multiple times with same parameters, and if the other user is sending msgs too, i got repeatedly the same msgs.
I got a way around it, without .abort() the getmsg() in sendmsg() it works well (ajax take care of both calls).
But when the user send repeatedly msgs, i need to wait in the sleep() loop (getmsg()) to get all the msgs, even if there only a word in each. Is there a way to make the abort() fire just one time on consecutive msgs, or how i could make the sleep() to go lower (less seconds) when it finds a message? Wouldt it take so much of the server to do this check everytime?
Thank
s предварително, съжалявам за твърде дългия текст. Ето функциите:
PHP
getmsg() (a php file, this is the function)
$aa = mysql_num_rows($chatresult);
$togetmsg = 2;
while($aa == 0 && $tried_times < 6) {
sleep($togetmsg);
$chatresult = mysql_query("query");
$aa = mysql_num_rows($chatresult);
$tried_times++;
}
while($crow = mysql_fetch_assoc($chatresult))
{
get the messages and put in a var/array;
}
json_encode the msgs
sendmsg()
Just a query to insert the textarea value in the table.
JAVASCRIPT
getmsg():
jack = $.ajax({
type: "POST",
url: "getmsg.php",
data: {friend_chatid: friend_chatid, msg_id: msg_id},
dataType: 'json',
context: this,
async: true,
cache: false,
timeout:30000,
success: function(html){
$(this).find(".div").append(message);
msg_id = 0;
var _this = $(this);
setTimeout(
getmsg, /* Request next message */
1000 /* ..after 1 seconds */
);
},
error: function(XMLHttpRequest, textStatus, errorThrown){
if(textStatus==="abort" || errorThrown==="abort") {
// alert(textStatus);
} else {
setTimeout(
getmsg,
3000);
}
}
});
SENDMSG()
$.ajax({
type: "POST",
url: "sendmsg.php",
data: {msg: msg, to: to},
context: this,
cache: false,
beforeSend: function () {
// jack.abort(); // Commented cause i`m not using it now
$(this).val('');
$(".div").append(msg); //
},
success: function(html){
// getmsg(); // Commented cause i`m not using it now
}
});
Възобновено е, изваждам частта с добавяне на данни, за да се чете по-добре. Sendmsg() в javascript добавя стойността на текстовото поле към чата и го изпраща в db с php, когато потребителят натисне enter и текстовото поле има текст (махам тази част за по-добро четене). Getmsg() влиза в цикъл while, като проверява дали има съществуващи съобщения с помощта на mysql_num_rows и ги повтаря, ако има такива.