Auto-saving forms

Hi @jaredpalmer! I was looking to migrate my forms to a simpler library and wondering if the Formik’s API would support auto-saving forms. I went through the README, but wasn’t sure if it would be possible (Apologies if I missed something!)

Usecase: Creating an auto-saving form, where values are saved as the user enters them. This, in most cases, will imply that the changes are saved (and/or validated server-side) onChange, though probably debounced. In some cases, onBlur can work but it is not always the optimum user-experience (for example, choosing a username).

Users might choose to submit in one of two manners - submit the entire form, or submit just that field. This is likely to happen when it is a heavier or a longer form.

So, the two features needed would be -

1. Submit on change or blur.
2. Submit that individual field rather than the entire form.

Thank you!

PS. FWIW, I hacked together a solution currently using Redux-Form and React-Debounce-Input that can be found here - http://gist.github.com/oyeanuj/2f69ebe1004e2ff47d7550d957bf05cf with the basic overview in the file TheAutoSavingForm.md in that gist.

[jaredpalmer]

The goal of my example to show the pattern you might use to handle pretty much kind of extended Formik behavior. Much like React Router 4, Formik is just a React component. This means that the problems you run into can usually be solved with just React and don’t require expanding the API. That being said, if there is a community need, I’d probably codify and bless a solution by creating formik-autosave

[shamilovtim]

Seeing as how in 2019 this is now how the majority of mobile forms work my opinion is that this should be a mainline option presented by the plugin itself. I know that this plugin isn’t explicitly for react-native but not having this feature somewhat excludes react native from working well with this plugin. Just my two cents here. I wouldn’t mind adding a PR to react-native-formik to address the lack of this feature.