Wrapper function doesn't return orignal function's result

[zzx88991]

I am using ASP.NET Webform (yeah, it is legacy code..) with <asp:UpdatePanel> and <AsyncPostBackTrigger>.
When a button click triggers a async postback, event.onsubmit from <form onsubmit="javascript:return WebForm_OnSubmit();"> will be called and return the validation result. However it is not returned once zone.js wraps the event handler, resulting the request not passing validation.

The source code here shows that the wrapper function doesn't return the result of
https://github.com/angular/zone.js/blob/master/lib/common/utils.ts#L89

const wrapFn = function(event) {
        let result;
        result = fn.apply(this, arguments);

        if (result != undefined && !result) event.preventDefault();
};

Not sure what it the purpose of this code not returning result. Thanks for taking a look.

[JiaLiPassion]

@zzx88991 , thank you for posting the issue, I will make a PR to fix it.

[JiaLiPassion]

@zzx88991 , I have further question about this one, I am not familiar with ASP.NET, current zone.js implementation just call event.preventDefault when eventHandler return false, so in your code, the form will not submit but you will directly use the eventHandler return value somewhere else, is that right?

[zzx88991]

Yes, you are right. The eventHandler is called somewhere else before the the form is submitted. I am just curious why wrapFun doesn't return result

[JiaLiPassion]

@zzx88991 , yes, it should return , I just want to create test case to prove it.