'yield' in an HTML event attribute value should be a free variable
reference, since the attribute value is taken as the source of a
function body, not of a function* body.
/be
Andrea Giammarchi <mailto:[email protected]>
January 8, 2014 1:21 PM
sorry, actually the right example was with `while (true) yield evt;`
but that's the same of async callback, the event is gone.
Well, everything good then ^_^
Thanks again
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Andrea Giammarchi <mailto:[email protected]>
January 8, 2014 1:19 PM
OK, I have overlooked at this ... so the following code won't have any
side effect, correct?
```javascript
addEventListener('beforeunload', function (e) {
(function*() {
while (true) yield null;
}());
});
```
Thanks
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Brandon Benvie <mailto:[email protected]>
January 8, 2014 1:12 PM
Calling a generator function just creates a paused generator.
Generators can't pause callers, just themselves (via yield).
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Andrea Giammarchi <mailto:[email protected]>
January 8, 2014 1:05 PM
Sorry, I explained it badly ... let me try again:
what if a DOM event handler uses/creates/invokes inside its function
body a generator?
Will the event pause until this will be satisfied?
`a.addEventListener('click', function(e){
if(methodThatInvokesGenerator()) e.stopPropagation(); });`
Is this a concern?
Thanks
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Domenic Denicola <mailto:[email protected]>
January 8, 2014 12:53 PM
What? That would just cause the event handler function to return a
generator object, which the browser would not use or do anything with.
It would have no effect.
------------------------------------------------------------------------
*From:* es-discuss <[email protected]> on behalf of
Andrea Giammarchi <[email protected]>
*Sent:* Wednesday, January 08, 2014 15:50
*To:* [email protected]
*Subject:* generators inside DOM events
I am not sure this has been discussed already but I wonder what would
happen if `yield` is used inside an event such 'beforeunload',
'unload', or even 'click' and others DOM related events.
Main concerns:
1. it's a UA trap potentially making impossible to leave a page or
complete a user meant action
2. not even transpilers can solve cases like this (i.e. a still valid
event eventually stopped after some generator logic where if
simulated the event would be expired at the time the function will
be invoked)
Thanks
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