Simple JS Help I think [Nets :P HELP!]

~~Dentafrice1~~ · 18-04-2007, 11:38 PM

Ok,

I have an ajax code to read a .php file, and I have my alert PHP file.

This is for an alert system. But instead of a refreshing iframe, I want ajax to do it.

I have it to work, but when there isn't an alert (or the one your session is set to) it shows a blank alert.

Very confusing in my wording it.

Page > serverTime.php sets session to the id of the alert > shows alert
Page > serverTime.php reads session, if no new alert echo ""; > shows blank alert

I don't want it to show any alert if there is already a session

+REP for all help!

nets · 18-04-2007, 11:48 PM

Code:

if(HttpRequest.responseText != '') {
  alert(HttpRequest.responseText);
}

?

You may have named your HttpRequest object something else.

~~Dentafrice1~~ · 18-04-2007, 11:56 PM

PHP Code:


<?
session_start();
$id = "401";
$message = "Caleb: test";
if($_SESSION[session_alert] != "$id") {
echo "$message";
$_SESSION[session_alert] = $id;
exit;
}
?>

Thats my servertime.php

Code:

<?php
     session_start();
    include("config.php");
?>
<script type="text/javascript">
var xmlHttp 

function GetXmlHttpObject()
{ 
    var objXMLHttp = null 
    if (window.XMLHttpRequest)
    { 
        objXMLHttp = new XMLHttpRequest() 
        }
            else if (window.ActiveXObject)
        { 
        objXMLHttp = new ActiveXObject("Microsoft.XMLHTTP")
    } 
    return objXMLHttp 
} 

function GetShouts()
{ 
    xmlHttp = GetXmlHttpObject() 
    if (xmlHttp == null)
    {
        alert ("Browser does not support HTTP Request")
        return
    }
    var url="serverTime.php"
    xmlHttp.open("GET", url, true)
    xmlHttp.onreadystatechange = function ()
    {
        if (xmlHttp.readyState == 4)
            { 
                if (xmlHttp.status == 200)
                    {
if(xmlHttp.responseText != '') {
  alert(xmlHttp.responseText);
}
                        ; 
                    
                    }
            }
    };
    xmlHttp.send(null); 
}
GetShouts(); 
setInterval("GetShouts()", 1000);
</script>
<body onload="javascript:GetShouts();">
</body>

thats my ajax.php, somethings wrong..

nets · 18-04-2007, 11:59 PM

You might have some whitespace in your serverTime.php page.

Code:

if(xmlHttp.responseText.replace(/^\s+|\s+$/g, '') != '') {
  alert(xmlHttp.responseText);
}

Mentor · 19-04-2007, 12:06 AM

You could add a null return?

PHP Code:


<?
session_start();
$id = "401";
$message = "Caleb: test";
if($_SESSION[session_alert] != "$id") {
echo "$message";
$_SESSION[session_alert] = $id;
exit;
}else{
echo "!no!";
exit;
}
?>

So basicly instead of returning nothing it returns !no! when there is nothing, which is easyer to pick up on.

Then in your js just change it to

if(xmlHttp.responseText != '!no!') {
alert(xmlHttp.responseText);
}

o.0

~~Dentafrice1~~ · 19-04-2007, 12:08 AM

Thanks carl and nets

+REP

Thread: Simple JS Help I think [Nets :P HELP!]

Thread Tools

Simple JS Help I think [Nets :P HELP!]

Posting Permissions