Solved

Various Browser checks

Posted on 2007-04-02
6
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Last Modified: 2008-02-01
Hi, Thanks for looking at my question, any idea's/comments are appreciated.

I am developing a login page to an online application and I would like to check the following information on the clients browser:

1. They must be using  i.e. 6 or up?
2. Cookies must be enabled (as I'm using sessions)
3. Javascript must be enabled

4. Also, I'm not sure if this is even possible but, is there a way of checking to see if the user's browser has the Check for newer version of stored pages' set to 'Every visit to the page''

If any of the above checks come back as false I would like to DISABLE my Username and password inputs.

Most of the applications I have developed have all been in-house so I've not had to worry which browser version etc as they have all been the same so this is a little different for me!  

Are there any other standard checks that I have missed out that i should be doing?

Many thanks for your time.

PDM
0
Comment
Question by:Pigdogmonster
  • 5
6 Comments
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 18835526
1:
agt = navigator.appVersion.toLowerCase();
var iePos     = agt.indexOf("msie");
var is_ie     = ((iePos !=-1) && (agt.indexOf("opera") == -1));
if (is_ie) {
  is_minor = agt.substring(iePos+5,agt.indexOf(';',iePos))
  is_major = parseInt(is_minor)
}
var is_ie6up  = (is_ie && (is_major >= 6));

alert(is_minor+'\n'+is_major+
'\n'+is_ie6up)
0
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 18835542
2:

// cookie.js file
/* (c) 1999-2007 Michel Plungjan javascripts(at)planet.nl
   unless otherwise stated */
   
today      = new Date();
expiryDate = new Date(today.getTime() + (365 * 86400000));

function isCookieEnabled() {
   if (document.all) return navigator.cookieEnabled;
   setCookie('testcookie',today.getTime());
   var tc = getCookie('testcookie');
   delCookie('testcookie');
   return (tc == today.getTime());
}


/* Cookie functions originally by Bill Dortsch */

function setCookie (name,value,expires,path,theDomain,secure) {
   value = escape(value);
   var theCookie = name + "=" + value +
   ((expires)    ? "; expires=" + expires.toGMTString() : "") +
   ((path)       ? "; path="    + path   : "") +
   ((theDomain)  ? "; domain="  + theDomain : "") +
   ((secure)     ? "; secure"            : "");
   document.cookie = theCookie;
}

function getCookie(Name) {
   var search = Name + "="
   if (document.cookie.length > 0) { // if there are any cookies
      var offset = document.cookie.indexOf(search)
      if (offset != -1) { // if cookie exists
         offset += search.length
         // set index of beginning of value
         var end = document.cookie.indexOf(";", offset)
         // set index of end of cookie value
         if (end == -1) end = document.cookie.length
         return unescape(document.cookie.substring(offset, end))
      }
   }
}
function delCookie(name,path,domain) {
   if (getCookie(name)) document.cookie = name + "=" +
      ((path)   ? ";path="   + path   : "") +
      ((domain) ? ";domain=" + domain : "") +
      ";expires=Thu, 01-Jan-70 00:00:01 GMT";
}
0
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 18835575
1,2,3:

<script src="cookie.js"></script>
<script>
agt = navigator.appVersion.toLowerCase();
var iePos     = agt.indexOf("msie");
var is_ie     = ((iePos !=-1) && (agt.indexOf("opera") == -1));
if (is_ie) {
  is_minor = agt.substring(iePos+5,agt.indexOf(';',iePos))
  is_major = parseInt(is_minor)
}
var is_ie6up  = (is_ie && (is_major >= 6));

if (!is_ie6up) {
  document.write('Please use IE6+');
}  
else if (!isCookieEnabled()) {
  document.write('Please enable cookies');
}
else document.write('<input type="text" name="userid" value=""><br><input type="password" name="password" value="">');
</script>
<noscript>
Please enable javascript
</noscript>
0
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LVL 75

Expert Comment

by:Michel Plungjan
ID: 18835584
4 cannot be detected but you can expire the page using meta tags or server settings

PS: 50 points?
0
 

Author Comment

by:Pigdogmonster
ID: 18835808
Hi Mplungan, thank you.

Is there a way I can make the elements in my form disabled, something like..


  document.FORMNAME.username.disabled = true;
  document.FORMNAME.password.disabled = true;
  document.FORMNAME.button.disabled = true;
}
</script>
0
 
LVL 75

Accepted Solution

by:
Michel Plungjan earned 50 total points
ID: 18835883
Sure.... But my solution will not even show them :)


<script src="cookie.js"></script>
<script>
agt = navigator.appVersion.toLowerCase();
var iePos     = agt.indexOf("msie");
var is_ie     = ((iePos !=-1) && (agt.indexOf("opera") == -1));
if (is_ie) {
  is_minor = agt.substring(iePos+5,agt.indexOf(';',iePos))
  is_major = parseInt(is_minor)
}
var is_ie6up  = (is_ie && (is_major >= 6));

function initPage() {
  if (!is_ie6up || !isCookieEnabled()) {
    document.FORMNAME.username.disabled = true;
    document.FORMNAME.password.disabled = true;
    document.FORMNAME.button.disabled = true;
  }
}
window.onload=initPage;
</script>


Michel
0

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More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

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