trigger cannout distinguish undefined from numeric 0 when passing single arg

[[email protected]…]

when passing an argument to trigger a custom event, if zero is passed, the custom event's parameter will be undefined.

trigger behaves properly when passing the single argument wrapped in an array

Here's a code example of the error:

trigger does not behave as expected. $("#foo").bind('bar',function(e,num){

if( typeof(num)==="undefined" ){

window.console.log("foobar: undefined");

}else{

window.console.log("foobar: "+num);

}

}); $("#foo").trigger('bar',1); alerts 1 $("#foo").trigger('bar'); alerts "undefined" as expected $("#foo").trigger('bar',0); YIKES! alerts "undefined"

below, just for comparison, is the function spoon which behaves as expected var spoon = function(num){

if( typeof(num)==="undefined" ){

window.console.log("working: undefined");

}else{

window.console.log("working: "+num);

}

}; spoon(1); alerts 1

spoon(); alerts "undefined" as expected spoon(0); alerts 0 as expected

});

[Rick Waldron]

Duplicate of #9285.