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Re: What's supposed to be the correct syntax to call function that has jQuery ajax within?

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You're right.  Thanks.

On Tuesday, September 13, 2016 at 7:25:51 PM UTC-4, Ben Bacarisse wrote:
> justaguy <.com> writes:
> 
> > I attempted to call a function by assign it to a variable's value but
> > it complained about "undefined", what is the correct way?  Thanks.
> >
> > <script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
> > <script>
> >
> > // ajax call for a server side script with State and County parameters
> > function ckCounty(st,cunty) {
> > 	$.ajax({
> > 		url: 'whateverScript.file?state='+st+'&county='+cunty,
> > 		success: function(rtn) {
> > 			rtn = eval(rtn);
> > 			if (rtn > 0) 
> > 			{ 
> > 				return 'green';		
> > 			}	
> > 		 // setTimeout(ckCounty, 2000);    
> > 		}
> > 	});
> > }
> >
> >
> > var	Color = 'grey';
> > Color = ckCounty('ga','TAYLOR');
> >
> > console.log(Color);
> >
> > </script>
> 
> This code exhibits a number of misunderstandings.  It's probably best to
> take things one step at a time.  The line
> 
>   Color = ckCounty('ga','TAYLOR');
> 
> assigns to Colour the value returned from the function call
> ckCounty('ga','TAYLOR').  But that call does not return a value
> explicitly so Color gets the value 'undefined'.  What value do you think
> Color should have?  'green'?  If so, you need to back up and learn a bit
> about how asynchronous requests work (that's the "A" in AJAX).  By the
> time the server has handled the request and the success function gets
> called, the ckCounty function has long since finished and returned
> whatever value it was going to.
> 
> -- 
> Ben.

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Thread

What's supposed to be the correct syntax to call function that has jQuery ajax within? justaguy <lichunshen84@gmail.com> - 2016-09-13 13:00 -0700
  Re: What's supposed to be the correct syntax to call function that has jQuery ajax within? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-09-14 00:25 +0100
    Re: What's supposed to be the correct syntax to call function that has jQuery ajax within? justaguy <lichunshen84@gmail.com> - 2016-09-16 18:13 -0700
  Re: What's supposed to be the correct syntax to call function that has jQuery ajax within? JJ <jj4public@vfemail.net> - 2016-09-14 06:52 +0700
    Re: What's supposed to be the correct syntax to call function that has jQuery ajax within? justaguy <lichunshen84@gmail.com> - 2016-09-16 18:12 -0700

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