This should work nicely, tried out earlier today in Safari, Firefox and Chrome.
Storing available vars in session for use throughout the app. My use case is
loading a different include file that consumes smaller jpg files for a slider
for mobile devices:
<cfif Not IsDefined('session.screenwidth')>
<cflock scope="session" type="exclusive" timeout="30">
<cfset session.screenwidth = "<script>document.write(screen.width);</script>">
<cfset session.screenheight = "<script>document.write(screen.height);</script>">
<cfset session.availWidth =
"<script>document.write(screen.availWidth);</script>">
<cfset session.availHeight =
"<script>document.write(screen.availHeight);</script>">
<cfset session.colorDepth =
"<script>document.write(screen.colorDepth);</script>">
<cfset session.pixelDepth =
"<script>document.write(screen.pixelDepth);</script>">
</cflock>
</cfif>
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