How to pass parameter to javascript function that contains web service results?

Question

I use this function in javascript to call web service (WCF):

function Do(caller)
{
   MyService.GetClient(some_id, CallBackGetClient);
}

function CallBackGetClient(WebServiceResult)
{
   var result = WebServiceResult;
   etc.
}

Now I want to pass parameter (caller) to CallBackGetClient function so I can make dictinction who called Do() function. How to pass a parameter?

Ben Zotto · Accepted Answer · 2010-09-10 15:04:48Z

2

You can put put it inside an anonymous function, for which you use the same function signature as the expected callback.

function Do(caller)
{
   MyService.GetClient(some_id, function(webServiceResult) {
       CallBackGetClient(webServiceResult, caller);
   });
}

Here you are passing an anonymous function to GetClient as the callback. That function will take the expected web service result as its argument, but inside that function, you're turning around and invoking the real CallBackGetClient, adding caller as a second argument. This works because caller gets "trapped" inside the scope of the anonymous function so it'a still usable.

And this right here is the best thing about Javascript.

edited Sep 10, 2010 at 15:04

answered Sep 10, 2010 at 14:44

Ben Zotto

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3 Comments

jlp Over a year ago

How then get both two in CallBackGetClient ?

jlp Over a year ago

CallBackGetClient will look like this: CallBackGetClient(WebServiceResult, caller) then?

Ben Zotto Over a year ago

I think I understand what you're after. I updated the answer. Hope that helps.

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