473,703 Members | 2,333 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

q - how to call a function once from onLoad

Hi all,

I'm trying to call javascript function via onLoad but running into a
problem. I would appreciate any help and suggestion.
My application is as follows. When a page loads, I want to check
whether the vistor has the site's cookie present in their browser. If
its not present, then to redirect user to a login page (script). If
the cookie is present, then the rest of the html page should load.

I'm able to get function to detect cookie's presence and direct to
login page correctly when cookie is not present.

If however, cookie is already present, since I'm using onLoad event,
the page is continuously getting loaded and this is causing the browser
to crash. I'm running windows xp, IE 6.0

question/request - can anyone suggest a way to call js function just
once via onLoad. Or any other way to load a function once without
having the user to perform any action as the page loads.

Thank you for your time,
Shree


<html>
<head>
<title>Ex_Detec t_Cookie</title>
<meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1">

<script language="JavaS cript">

function DetectCookie() {
var tmpcookie = new Date();
chkcookie = (tmpcookie.getT ime() + '');
document.cookie = "chkcookie= " + chkcookie + "; path=/";
if (document.cooki e.indexOf(chkco okie,0) < 0) {//cookie is present
//if (document.cooki e && document.cookie != "") {//cookie present
and is not null
var CurrentPage = document.locati on.href;
window.location = CurrentPage;
alert ("cookie is present, no need to direct user to login
page");
}
else {
//cookie is not present, redirect user to authentication page.
alert ("cookie is not present, redirect user to login page");
function LaunchCGIprogra mText() {
var holderText = new Image();
holderText.src = "http://www.open365test .net/login.pl?" +
document.locati on.href;
window.location = "http://www.open365test .net/login.pl?" +
document.locati on.href;
}
LaunchCGIprogra mText();
}
}

//-->
</script>
</head>

<body onLoad= 'DetectCookie() '>
<p>Print hello.
</body>
</html>

Jul 28 '05 #1
2 2656
Lee
shree said:
question/request - can anyone suggest a way to call js function just
once via onLoad. Or any other way to load a function once without
having the user to perform any action as the page loads.

Thank you for your time,
Shree


<html>
<head>
<title>Ex_Dete ct_Cookie</title>
<meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1">

<script language="JavaS cript">

function DetectCookie() {
var tmpcookie = new Date();
chkcookie = (tmpcookie.getT ime() + '');
document.cookie = "chkcookie= " + chkcookie + "; path=/";
if (document.cooki e.indexOf(chkco okie,0) < 0) {//cookie is present
//if (document.cooki e && document.cookie != "") {//cookie present
and is not null
var CurrentPage = document.locati on.href;
window.location = CurrentPage;
alert ("cookie is present, no need to direct user to login
page");
}


So you're logic says:

if the user is logged in
go to the current page
else
go to the login page.

It should be:

if the user is not logged in
go to the login page

There is absolutely no reason to set the window.location value to
the current page. You're already there.

Jul 28 '05 #2
shree wrote:
I'm trying to call javascript function via onLoad but running into a
problem. I would appreciate any help and suggestion.
My application is as follows. When a page loads, I want to check
whether the vistor has the site's cookie present in their browser. If
its not present, then to redirect user to a login page (script). If
the cookie is present, then the rest of the html page should load.


And if the user has disabled javascript in their browser then they get to
bypass the login screen.

If you want to check for login credentials then do it at the server, no
javascript required.
Jul 29 '05 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

1
4381
by: Larry R Harrison Jr | last post by:
I have a webpage for showing slideshows. I got the code from http://javascript.internet.com/miscellaneous/image-slideshow.html It's very simple, clean-looking, and small-sized. The only problem--it doesn't start the slideshow when you load it--and it tends to skip to slide #2. (I thus insert a "blank slide"--basically "nothing.jpg"--to make up for this.) The person has to click "start" once the page loads. I'd rather it start...
5
2778
by: danny.myint | last post by:
I was under the assumption that javascript loads all the <head></head> elements before processing the <body> tag in Mozilla/Netscape/Firefox. It doesn't seem like it, with my problem. I have navigation that has onMouseOver and onMouseOut triggers, that use function calls in my external .js file. When I mouseOver a button in my navigation quickly enough to catch it before the rest of the body loads, it returns a function "not defined"...
39
6538
by: Randell D. | last post by:
Folks, I'm sure this can be done legally, and not thru tricks of the trade - I hope someone can help. I'm writing a 'tool' (a function) which can be used generically in any of my projects. When it completes, it can call a success, or a failure function. The names of these success, or failure functions will differ, and I'd like to know how I can pass the name of a function to my tool, and how my tool can call the function, using that...
9
2176
by: Paul | last post by:
HI! I need to call a function that is located in the parent. I need it so that it calls when the child page in the iframe loads. Would it be better to use an onload event in the body? if so how do I call it from the child page? -- Thanks in advance :) Paul
8
4830
by: Jade | last post by:
I saw some web page saying I could do it this way in javascript: var iNumber = <%#publicvarname publicpropertyname %> but it doesn't seem to work. I have this piece of code here in javascript: <script language="javascript"> var sessionServer = "<%#jsTestServer%>"; alert(sessionServer); </script>
3
13606
by: anadimpa | last post by:
Hello all I build a javascript function string in the code behind and register it in the Page_Load of my User Control. I do this because I build the javascript based on some variables that are passed to this user control. How do I (or from where do I) call this function? I tried several ways like: this.Attributes.Add("onLoad", "javascript:openDoc();"); in the page_load / page_prerender etc...
19
3823
by: thisis | last post by:
Hi All, i have this.asp page: <script type="text/vbscript"> Function myFunc(val1ok, val2ok) ' do something ok myFunc = " return something ok" End Function </script>
6
9560
by: pronerd | last post by:
Hi, I am trying to dynamically set an event handler across frames. I have no problems setting properties across frames doing something like parent.ToolMenuFrame.location.href = 'http://www.blah blah blah.com'; But when I try to set an event handler this way, as shown below, it fails. parent.ToolMenuFrame.window.document.body.onload = "alert('On Load Trigger Fired!!');"; parent.ToolMenuFrame.document.body.onload = "alert('On Load...
3
7366
by: Jimmy | last post by:
It is also possible for popup window to call function in main window by using the opener property. Will "opener.someFunctionInMain(param1, param2)" in the popup window work? It's possible for main window to call function in the popup window, right? The following is a sample code (close popup window causes to show alert window) which doesn't seems to work. Can anyone see the problem? // main
0
8758
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
9121
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
9017
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
7867
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
1
6588
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
4432
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
1
3123
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
2450
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
2069
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.