Cannot read property 'add' of undefined

How-to Discussions
1

Any idea what’s going on here? I’ve got an observable list but it won’t let me use .add property to add another entry in the list.

Error: JavaScript call error in calendar.js line 330: Name: TypeError: Cannot re
ad property ‘add’ of undefined
Error message: Uncaught TypeError: Cannot read property ‘add’ of undefined
File name: calendar.js
Line number: 330
Source line: monthData.add({theDate: x});
JS stack trace: TypeError: Cannot read property ‘add’ of undefined
at buildMonth (calendar.js:330:30)
at previousDay (calendar.js:410:5)
in Fuse.Reactive.EventBinding+CallClosure<C:\Users\ThomsoMa\AppData\Local\Fuset
ools\Fuse\App\app-0.26.0.7741\Packages\Fuse.Reactive\0.37.9$.uno:1149>

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2

Don’t know if it’s helpful, but I’ve gotten that error when I accidentally assigned something to the observable that’s not an observable - usually I meant to assign it to it’s value - e.g:

monthData = theDate // where “theDate” is not an observable and meant “monthData.value = theDate;”

or

monthData = now(); // when I mean “monthData.value = {now()};”

or

monthData = monthData.add({theDate: x});

3

Thanks for the suggestion. I’ll check it out!

4

Thanks I resolved the issue now. The function was returning a dataset at the end and writing over the Observable. This seemed to cause the problem. I stopped the function from returning the set and it works fine now.
Thanks!