how to pass multiple arguments to onSuccess function in Prototype?

Question

I am a beginner in using Prototype library. I want to know how we can pass multiple arguments to onSuccess/onFailure function in Prototype? For example:-

new Ajax.Request('testurl',{
        method: 'post',
        parameters: {param1:"A", param2:"B", param3:"C"},
        onSuccess: fnSccs,
        onFailure: fnFail
        })

In my success function fnSccs:-

function fnSccs(response)
{
    alert(response.responseText);
}

I want to pass a new argument to fnSccs function. How is that possible. Thanks for any help.

Answer 1

You could wrap your success function into another one that recieves the desired parameter, and returns your old function back:

new Ajax.Request('testurl',{
                method: 'post',
                parameters: {param1:"A", param2:"B", param3:"C"},
                onSuccess: mySuccess('myValue1', 'myValue2'),
                onFailure: fnFail
                })

function mySuccess(param1, param2){
  return function(response){ // Your old success function
    alert(param1);  // The parameter still accessible here
    alert(param2);
    alert(response);
  }
}

What happens is that when you call mySuccess(...) your old function is returned, but you still have access to the parameters because the variables remain allocated on the outer closure .

You can check the running snippet here .