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RTAdams89
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Joined: 06 Nov 2005
Posts: 102
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 Posted: Tue Jan 30, 2007 11:59 pm Post subject: Alternative to cookies |
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I have a website that is designed for a particular monitor resolution. When a person with a smaller screen setting visits the page, a popup window notifies them that it appears better at a larger resolution. I didn't want to annoy my visitors too much, so the site also sets a cookie that prevents the message from being displayed on subsequent visits. The code is as follows:
| Code: | <SCRIPT type="text/javascript">
function SetCookie(name, value, days) {
var expire = new Date ();
expire.setTime (expire.getTime() + (24 * 60 * 60 * 1000) * days);
document.cookie = name + "=" + escape(value) + "; expires=" +expire.toGMTString();
}
function GetCookie(name) {
var startIndex = document.cookie.indexOf(name);
if (startIndex != -1) {
var endIndex = document.cookie.indexOf(";", startIndex);
if (endIndex == -1) endIndex = document.cookie.length;
return unescape(document.cookie.substring(startIndex+name.length+1, endIndex));
}
else {
return null;
}
}
var correctwidth=1024
var correctheight=768
if (screen.width!=correctwidth||screen.height!=correctheight)
{
if(GetCookie('screensizealerted')==null)
{
SetCookie('screensizealerted', 'screensizealerted', 365);
alert("This webpage is bested viewed with screen resolution "+correctwidth+"*"+correctheight+". Your current resolution is "+screen.width+"*"+screen.height+". If you experience problems while viewing this site, please try changing the resolution to "+correctwidth+"*"+correctheight+". You will not receive this warning again.");
}
}
</SCRIPT> |
However, this doesn't work if the cookie is blocked. Is there a better way to go about this? Perhaps by recording the IP address on the server end? |
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pkSML
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Joined: 29 May 2006
Posts: 952
Location: Michigan, USA
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| Posted: Thu Feb 01, 2007 10:02 pm Post subject: |
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Just a thought...
Have one JavaScript set the cookie that loads at the beginning of the HTML.
At the end of the HTML, have a Javascript routine that checks to see if the cookie was written. If not, give them another message, which can be on the page somewhere.
Example from http://stephen.calvarybucyrus.org/comics: | Code: | <SCRIPT>
function write(){
document.all.loading.innerHTML = "Cookies are not on. Please enable them for a more personalized browsing experience.";
}
</SCRIPT> |
It will replace the text inside the <div> tag looking like this: | Code: | | <div id="loading" style="position: absolute; top: 46px; right: 80px; background: white;">Cookies are on.</div> |
You just have to call the function, like this: | Code: | | <script>write()</script> |
You might also see http://stephen.calvarybucyrus.org/search/javascript+if+cookie+fails
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