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js logon validation

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Feb 11.2007

I am trying to implement a simple client side validation to ensure the user has logged on. Yes, I know I can’t rely upon client side validation, and will also implement albeit less elegant server side validation for non-javascript enabled users.

If the user hasn’t logged in (as determined by 1<>2 in my example), then I want an alert window to pop up and the link not to be followed. Can anyone comment how I should modify this script to do so. Thanks

[code=html]<head><script type=”text/javascript”>
function check_if_logged_on() {
if(1==2) //check if js session set
{return true;}
else
{alert(“Please Log In”); return false;}
}
</script></head>
<body>
<A HREF=”nextpage.php” onClick=”check_if_logged_on()”;>Link</a>
</body>
</html>[/code]

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1 Comments(s) ↴

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@NotionCommotionauthorFeb 11.2007 — I have somewhat of a fix by adding the return in my onClick statement. It does leave window.status with the non-followed link name on FF, but not in IE. For learning purposes, I would appreciate any comments on how I am trying to implement and the use of return false to stop process. Thanks

[code=html]<script type="text/javascript">
function check_if_logged_on() {
if(1==2) //check if js session set
{return true;}
else
{alert("Please Log In");
// window.status = '';
return false;}
}
</script>
</head>
<body>
<A HREF="somewhere.html" onClick="return check_if_logged_on()";>Link</a>
</body>
</html>[/code]
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