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I am using the IO module to send different POST requests to a servlet.
Function code is given below. The 'execute' function is used my different part of the application to contact servlet.
The issue i am facing here is regarding the 'success' function getting called repeatedly. for example, if the 'execute' function is called for the 3rd time, the success function will be called 3 times; and so the 3 different 'responsefunc' will be executed (The one corresponding to the latest request and the previous two) !!.
Is it a YUI bug, configuration issue, or my mistake in coding?
Please help.

this.execute = function(callback) {
var cfg = {
method: "POST",
data: this.getRequest(),
sync: this.sync,
headers: { 'X-Transaction': 'POST Example'}
};

var success = function (x, o){
try {
responseFunc(o.responseXML, callback);
}catch(e)
{
alert("Parsing response failed!");
return;
}
}
var failure = function (x, o){
alert("io failed !");
}
Y.on('io:success', success);
Y.on('io:failure', failure);

var request = Y.io("/Test/TestServlet", cfg);
}

Thanks a lot Thomas. It works.
Had tried detaching the event listener each time to avoid this issue. But now it is perfectly resolved after defining the event handler in configuration.
I have also made sure that the variable assigned to the 'sync' is having a boolean value.

Thanks a lot.
Rakesh