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How to access javascript variable with CFC?

Posted on 2010-09-20
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Last Modified: 2012-05-10
Experts,
I would like to understand the best approach to accessing a javascript function from Coldfusion. Can someone please, in the simplest terms possible, please give an example of a way to do the following. Coldfusion 8.

<script>
   var hasThePlugin = isInstalled();
</script>

<cfset CFhasThePlugin = hasThePlugin>

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I have no access to the "isInstalled" js function.

I feel this is a simple implementation of the cfajaxproxy tag but I'm just not getting it.

Thanks!
<script>
   var hasThePlugin = isInstalled();
</script>

<cfset CFhasThePlugin = hasThePlugin>

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Question by:MPMueller
3 Comments
 
LVL 63

Accepted Solution

by:
Zvonko earned 1000 total points
ID: 33720504
It depends what you want to achieve.
What you will never get is the JavaScript values arrive on ColdFusion side before the page was sent to browser.
And that is the problem.
All ColdFusion page source is executed first on server side and sent then to browser as Text page.
Then is that Text page executed as HTML. JavaScript sections on that HTML page can do a second ColdFusion call to another CF page or CFC function to post values or get values. But those values cannot be applied to the initial ColdFusion page because that page finished execution before it was sent to the browser.

You see?


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Author Comment

by:MPMueller
ID: 33721335
Yes, and the more research I've done the more I understand, thanks for the reply.

I have successfully managed to use cfajaxproxy to update the value of a form element based on the reply to that function call, and that will work for me.

Apologies if this is off topic, but is it possible for my bind in the proxy to be fired when the page loads, as opposed to relying on a users action?

Something like:



<cfajaxproxy bind="javascript:isInstalled({vLoginName@PAGELOAD})" onsuccess="callBackHandler">

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LVL 6

Assisted Solution

by:reiters
reiters earned 1000 total points
ID: 33731054
wrap you code in a function and then put this at the bottom of the page

<cfset AjaxOnLoad("function_name_here")>
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