SurveyJS - Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App
With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
surveyjs.io
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react-transition-group
An easy way to perform animations when a React component enters or leaves the DOM
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I don't have an answer to your specific question but I do have a recommendation that might help. Take a look at https://reactcommunity.org/react-transition-group/. It's very popular and used by MUI in their animated components. Even if you don't install it, looking at their docs and source code might help you get a better idea of how to do what you want.
NOTE:
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Hence, a higher number means a more popular project.