There’s a bug in the SetValue() function of the dropdown causing the value not to update (and triggering no events etc).
TMP_Dropdown.cs, line 421:
if (Application.isPlaying && (value == m_Value || options.Count == 0))
should be
if (Application.isPlaying && (value == m_Value))
Consider this use case:
Inspector value is X (default 0).
The app starts and has to wait for data. As there is no data is available it should fall back to the placeholder. Therefore I first set options to an empty array and value to -1. Looks okay as the placeholder is shown, but under the hood it never changes value to -1 because of the condition above: It stays X because I first set options to an empty array.
When data is available I set options to a non-empty array. The setter (line 286) triggers RefreshShownValue() and displays the Xth option as selected. The user never selected an option but the component a) shows a arbitrary selection and b) never triggers the onValueChanged event even though the selected value now changed from the -1 we (tried to) set before to X.
I don’t know if here’s the right place to report something like this, if not, please point me to the right direction.
Reporting issues via the forum is totally fine. However, since I am traveling this week, I would kindly ask that you submit a bug report via the bug reporter as this will make it easier for me to track the issue and ultimately provide a solution / confirm that your change is fine.
Please be sure to include the steps to reproduce the issue along with repro project. Once you have the Case # via email, please post it here as well as this will make it easier for me to find and get to it sooner.
P.S. I will be back in town on Friday and should be able to look at this over the weekend.
