Question

Javascript / CFQuery UserID Lookup

Asked by: aescribens

Hello Experts,

I have a page which has an option for a user to login to their facebook account (using an API).  The action calls the facebook server and facebook returns the userid (UID), which is unique to the user login in and I am able to capture that UID on javascript.

Upon user login, I need a way to cfquery my database and search to for that UID.  If it exists, then nothing happens, if it doesn't exist, then I will user cfquery to capture and store the user's info (fname, lname, etc.)

This is the function that is triggered when the user logs into facebook:

function renderUI(res)  
        {  
            if (res.user!=null && res.user.isConnected)  
            {   
			var loggedinuser = res.user.UID;
                               document.getElementById("s_uid").value = res.user.UID;
				document.getElementById("name").innerHTML = res.user.nickname;
				document.getElementById("s_fname").value = res.user.firstName;
				document.getElementById("s_lname").value = res.user.lastName;
				document.getElementById("s_public").value = res.user.firstName;
				document.getElementById("s_email").value = res.user.email;
				document.getElementById("s_flag").value = 1;
				//document.s_autoregister.submit();
				
				<cfquery name="s_user"datasource="onestopdb1">
				select *
				from users
				where social_uid = 'loggedinuser'  //This query works, but only if I manually enter the data.
				</cfquery>
	]
    </script>

                                  
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Asked On
2009-09-18 at 17:45:22ID24744939
Tags

javascript

,

cfquery

Topics

ColdFusion Application Server

,

JavaScript

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: _agx_Posted on 2009-09-18 at 18:09:24ID: 25371054

I have never used the feacebook api. But you can't execute a cfquery from javascript.  

Javascript runs in the client (browser) and CF runs on the server.  By the time your javascript executes, you are already disconnected from the CF server.  So any javascript code executes long after the CF code is already done.   If you need to run another query on the server, you have to submit another http request.  Either using ajax, a basic form submit, etc...

 

by: aescribensPosted on 2009-09-18 at 18:17:25ID: 25371071

Thanks for your reply.  I understand what you are saying, the query actually does work, but only outputs the first 2 records, probably because the I get disconnected, to your point.

Would this work?

1. Executing a cfquery of all my users outside of javascript.
2. In javascript, create an Array of all my users.
3. In javascript, loop thru the Array and compare against the UID.
4. If no match is found, execute the form to capture the user information.

Thanks again for your help.

 

by: _agx_Posted on 2009-09-18 at 18:22:21ID: 25371082

Yes it probably would.  But it doesn't seem like a great idea.  If it's a one time event on login, why not just submit the form and let the receiving page determine whether it needs to add the user as new or ignore it?

If you try the method above
1) You're exposing all UID's to everyone
2) It is not scalable. Given a large enough set of data, javascript eventually chokes.

 

by: _agx_Posted on 2009-09-18 at 18:23:13ID: 25371088

> If you try the method above

... ie the 4 steps you outlined ...

20120131-EE-VQP-002

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