I have spent some time trying React Inline Edit Kit (which seems to be the most popular in-place editing package) and wiring up SimpleSchema via validateOne() to validate user input, and it works well in normal cases.
However I have some issues with it, particularly that a user may lose whatever new text he or she entered if validation failed:
Also, the number field does not seem to work in Firefox browser:
It appears that the repository is no longer maintained.
Are there any good alternatives?