Passing js Variable to CF

[Rouset]

I need to be able to pass a data variable from javascript to Cold Fusion. Is there a way to do that? Something like the ToScript in Coldfusion that allows to pass a CF variable to javascript.

Or, is there a way to write data values to a database using javascript directly? I have a set of data, that is being collected and passed via javascript. So, my thought is to pass those data values from js to Coldfusion to write them back to the database. But, let me know if there is a better way to do that.

Thanks,
Ros

[Newsgroup_User]

javascript = client-side
cf = server-side

these are 2 parallel worlds only connected by http request/response
path... unless you stay on that path, you will never reach the other
world...


Azadi Saryev
Sabai-dee.com
http://www.sabai-dee.com/

[Newsgroup_User]

To pass ColdFusion data to JavaScript is no different then passing
ColdFusion data to HTML.

<cfset myCFvar = "Say goodnight Gracie.">
<cfoutput>
<script type="text/javascript>
var myJSvar = #myCFvar#;

alert(myJSvar);
</script>
</cfoutput>

The <cfwddx...> tag with its' CFML2JS option makes it easier to convert
complex data structures from CF to JS forms.

To pass JavaScript data to ColdFusion you have to submit it in a
request. You can submit it as a get request in the URL, as a post
request with form controls or with an Asynchronous JavaScript request
with XMLHttpRequest commonly called 'AJAX'.

[Rouset]

Thanks Ian,

Could you please give an example of the Asynchronous JavaScript request
with XMLHttpRequest commonly called 'AJAX'. This sounds like what I would need to do to pass the data values back to Cold fusions and then write them to the database.

Ros

[Adam_Cameron]

Your best first port of call would be to read up on <cfajaxproxy>, because CF does most of this for you automatically.

http://livedocs.adobe.com/coldfusion/8/Tags_a-b_3.html

--
Adam

[Rouset]

Great.. Thanks, Adam. I will check it out. -Ros

[Rouset]

cfajaxproxy is great.. But it is only available on CF8.. We are running CF 7. So, how would you do it in that case?

thanks,

Ros

[ilssac · Accepted solution]

Prior to CF8 you would be using CFAjax or AjaxCFC or rolling your own.

http://www.indiankey.com/cfAjax/

http://www.robgonda.com/blog/projects/ajaxcfc/

Your on your own for rolling your own.

[Rouset]

Hi Ian,

One more question for you regarding CFAjax.. Can 2 parameters be passed to the DWREngine._execute?

All the examples that I have found only have one parameter. I figure the back up option would be to concat the variables into one string to pass them to the engine and separate them in the CFfunction, but I did not want to go down that path if there is a better way.

Thanks,

Ros

[Rouset]

OK, it all works great! 🙂

For those that may be looking for this answer, multiple parameters can be passed to the DWREngine._execute command by a comma separator.

DWREngine._execute(_cfscriptLocation, null, doQuery, Par1, Par2, Par3,...,doQueryResult);

Where Par1, Par2, Par3 are the parameteres being passed to the doQuery cffunction.

Thanks for everyone's help.

Ros

[Dan_Bracuk]

quote:

---

Originally posted by: Rouset
I have a set of data, that is being collected and passed via javascript. So, my thought is to pass those data values from js to Coldfusion to write them back to the database. But, let me know if there is a better way to do that.

Thanks,
Ros

---

Care to elaborte on that first sentence with particular emphasis on the word "passed".