[BUG?] Calendar field don't fill when event onchange is trigger

Hi
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Im trying create a event in javascript to calcule age with birthdate
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I add a custom/javascript module in form with this code:
​[pre]function calculateage()
{[br] var fecha=document.getElementById("fecha_de_nacimiento").value;[br] var justnow=document.getElementById("nowdate").value;[br] alert("birthdate: "+ fecha+ " Now: "+justnow);[br] [br]}[br][/pre][br]
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The problem is when i try pick a date in "fecha_de_nacimiento" the event trigger but don't write nothing in field "fecha_de_nacimiento" and then i can't calculate age in function :/
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Im doing something wrong?

without this event it works ?

You might need to apply an onchange event directly in JS to the hidden field that's under the calendar that actually holds the selected date.

without this event it works ?

Yes, the event work fine, the problem is the calendar, when i choose the date, first launch event onchange and later fill the field with the date.. (click on field - calendar poppup - choose date and click - event onchange launch - event onchange finish - calendar fill field with data) then i can't pass the value fill to the date, maybe can i pass the value calendar to event? how?
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You might need to apply an onchange event directly in JS to the hidden
field that's under the calendar that actually holds the selected date.

I don't know what you want say (sorry my english is no very good)
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the hidden field is date nowdate, this load on load document, can't fire onchange because no change
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I try apply the onchange event in the field "Age" where show the results of event, and work fine, but no its a soluction, because you need write anything here to launch the event
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The problem is the calendar i thik, if the field is writeen before event is launch then will work as expected, or maybe a way to capture the calendar data on onchange launch

without js script the calendar work fine

Just try to call $("#nowdate").val("2020") in the code, does it set the field value ?

what? the problem is get the birthdate data (fecha_de_nacimiento) i havent any problem with nowdate
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The real problem is that the event "on change" from javascript is trigered after the value of calendar is set in the field, then i can't get it in the event.

Could you please download v7 beta and try this ? it should work fine, and actually there is a "Set Value" action that you can use directly!
http://www.chronoengine.com/blog