I want to figure out the scroll depth - reactjs

I'm building a widget that users add to their website using code snippets.
I want the widget to appear only at certain scroll depth set by user. Can somehow help me figure out how to identify the scroll depth of a page in a preact/ react application.

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I'm writing an application on react native and I want a user settings menu that will go to the top of the screen. I have attached an approximate version I want to get.
I looked at the whole Internet and didn't find a single reference where someone faced a similar problem.

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What type to use to create a half page in reactjs

I am working on a software project that will allow the user to create a chat. My application will have a chat button which when clicked by the user will trigger the display of a rising half page spanning the screen in length and which can be topped, like this:, Here I take a example on the vscode console and the circled button is the button I would like to create at the top of the window to allow overriding it. My main concern is that I don't know how to create this type of page and when I search the web I see tutorials for creating modal windows and courses for getting started in reactjs. I'm brand new to reactjs and hope to get help from more experienced members of the community.
Thank you for reading my question and I look forward to your responses.

Trigger scroll to roll down to bottom automatically in Mendix Native Mobile App

I’m working on a Native Mobile App, which is being built inside the Mendix Platform. And I'm trying to figure out how to trigger a scroll-to-bottom behavior automatically.
My situation is:
I have a form with a lot of fields, and some with conditional visibility. Which means that they will appear if the user selects some specific options, in radio-buttons.
But some of them will be out of the visible area when the user clicks the related radio-button, and the field becomes visible (as it is located at the bottom of the form).
I trying to find a way to force the scroll to the bottom when these new fields become visible (from the user click in radio-button above).
Any suggestion on how to achieve this?
In the Mendix market place there is a native widget that seems to be able to do what you need to achieve: https://marketplace.mendix.com/link/component/116738
The last update was in May this year for Mendix 9.1 and there is a version for Mendix 8.17 as well.
Hope this provides a solution.

Prepending items in a invertible scroll view for a chat application - react native

I am developing a chat application that contains a list of messages for a conversation. When prepending messages to the invertible scroll view (using react-native-invertible-scroll-view), it's automatically scrolling to the top.
What is causing it to scroll to the top and how can I resolve the issue?
If its a chat application you are better off using a Flatlist.

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