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How do I expand div smoothly when new content is added

How do I make a div expand smoothly when content is added?
const [render, setRender] = useState(false)
const showHide= () => {
setRender(!render)
}
return (
<div className="container">
<h1>TEST CONTAINER</h1>
{render && <Paragprah />}
<button type="button" class="btn btn-primary" onClick={showHide}>Primary</button>
</div>
);
}
CSS
.container {
margin-left: 30%;
margin-top: 10%;
width: 500px;
height: auto;
background-color: whitesmoke;
}
In the above, a component is being rendered when a button is clicked, when the new content is added to the div, it expands instantly. basically, I would like it to expand smoothly when the content is added. Here is a video as well by what I mean when it expands instantly.
Setting a fixed height wont work in my situation because the content that's being loaded is dynamic, its coming from an API and the length is different everytime. So setting a fixed height will make the content overflow sometimes. I need a way where the transition can occur smoothly and the height still be large enough to fit the content, which would probably require ```height: auto;`` to be present?
Link to Imgur video

you can use the transition css property for a smooth transition.
transition: height 2s;
Follow this link for reference.

Here I updated the code. Since the content that's being loaded has dynamic size then you have to track that content size using useRef hook and store it on a variable and export it with your component.
import { useRef, useEffect} from "react";
var ParagraphHeight;
function Paragraph() {
const ref = useRef(null);
useEffect(() => {
//when you content is loaded store its height
ParagraphHeight = ref.current.offsetHeight;
}, []);
return (
<div ref={ref}>
<p>Your content here for exemple...</p>
</div>
);
}
export { Paragraph, ParagraphHeight };
Now import your Paragraph component and put it inside a .wrapper div that has a default height of 0px (that means your Paragraph will be hidden) and when you click on the button the height of it will change to the ParagraphHeight
import { useState } from "react";
import { Paragraph, ParagraphHeight } from "./Paragraph.js";
export default function App() {
const [isopned, setisopned] = useState(false);
const [wrapperHeight, setWH] = useState(0);
const showHide = () => {
if (!isopned) setWH(ParagraphHeight);
else setWH(0);
setisopned(!isopned);
};
return (
<div className="container">
<h1>TEST CONTAINER</h1>
<div className="wrapper" style={{ height: wrapperHeight }}>
<Paragraph />
</div>
<button type="button" className="btn btn-primary" onClick={showHide}>
Primary
</button>
</div>
);
}
Finally don't forget to update your css, add overflow-y hidden and css transition to to expand your wrapper div smoothly.
.container {
margin-left: 30%;
margin-top: 10%;
width: 500px;
background-color: whitesmoke;
}
.wrapper {
display: grid; /*to prevent some problem caused by overflow hidden*/
transition: height 1s linear;
background-color: wheat;
overflow-y: hidden;
}
This is a live exemple demo

React snap scroll not functioning

I'm trying to get the snap scroll feature working in my react app. I've tried using the normal CSS method, but it does not work in chrome as mentioned in scroll-snap skips section on smaller screen - Chrome.
So I decided to use the package at https://www.npmjs.com/package/react-use-scroll-snap. But the snap scroll feature is not working at all. (When scroll, no "snapping" occurs as expected)
Expected behavior:
When scroll downwards, the view should snap to the "FIRST" div then to the "SECOND" div and so on.
What am I doing wrong here - am I missing something really basic?
Thanks.
App.jsx
import useScrollSnap from 'react-use-scroll-snap';
import React, { useRef } from "react";
import Topbar from "./components/topbar/Topbar";
import "./app.scss";
function App() {
const scrollRef = useRef(null);
useScrollSnap({ ref: scrollRef, duration: 100, delay: 50 });
return (
<div className="App">
<Topbar></Topbar>
<div className="sections" ref={scrollRef}>
<div>FIRST
</div>
<div>SECOND
</div>
<div>THIRD
</div>
<div>FOURTH
</div>
</div>
</div>
);
}
export default App;
app.scss
.App{
height: 100vh;
.sections{
width: 100%;
height: calc(100vh - 70px);
background-color: lightblue;
position: relative;
top: 70px;
scroll-behavior: smooth;
> *{
width: 100vw;
height: calc(100vh - 70px);
}
}
}

I have found a solution for my problem. The package https://www.npmjs.com/package/scroll-snap gave the result that I was looking for.
It works with chrome but not with firefox; I think has to be some minor issue because the package's docs say it supports all modern browsers.

Use styled-components to center React Bootstrap Modal

Is it possible to use styled-component to create a wrapper container containing React Bootstrap's Modal component in order to make the modal be both horizontally and vertically aligned?
Tried creating CenteredModal container as shown, but the .modal element does not appear to have the new styles applied to it.
import { Modal } from "react-bootstrap";
import styled from 'styled-components';
const CenteredModal = styled.div`
& .modal {
display: flex !important;
align-items: center;
}
`
interface MyModalProps {
isOpen: boolean,
onHide: () => void
}
export default function MyModal({
isOpen = false,
onHide,
}: MyModalProps) {
return (
<CenteredModal>
<Modal show={isOpen} onHide={onHide}>
<h1>Hello</h1>
</Modal>
</CenteredModal>
)
}

Because Modal of react-bootstrap isn't render inside CenteredModal, so your style can't affect it (You can open the browser developer tool to see, it should be rendered at the bottom of the html body not in the CenteredModal div element).
I saw react-bootstrap is already provides a centering method, is this what you want? you can take a look https://react-bootstrap.github.io/components/modal/

why not use centered prop ?
example :
<Modal
size="lg"
centered
>

Your new container just needs a little tweaking:
const CenteredModal = styled.div`
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
`

You can use this syntax:
import { Modal } from "react-bootstrap";
import styled from 'styled-components';
const CenteredModal = styled(Modal)`
display: flex !important;
align-items: center;
`;

Place text at the bottom of a div in React

How can I place text at the bottom of a div in plain old React (not React Native)?
In html, you can place text at the bottom of a div by using
vertical-align: text-bottom;
In React Native, it looks like you place text at the bottom of a div by using
textAlignVertical: "bottom",
Is there a simple way to place text at the bottom of a div in plain old React?
The only method I got to work so far is is to use Flexbox.
import React from "react";
import "./styles.css";
export default function App() {
const style3 = {
height: "75px",
display: "flex",
justifyContent: "flex-end",
alignItems: "flex-end",
};
return (
<div className="App">
<div style={style3}>CSS Flexbox</div>
</div>
);
}
Codesandbox
Edit: This is a simplified example. What I really need is a div with items in several different spots, and text on the bottom.
Edit: In both HTML and React, vertical-align: text-bottom; does not move text to the bottom of a div. It only shifts the text down a little bit to the bottom of where the text would normally be. So in both HTML and React, it can be used to shift text down a little for a subscript. But in both HTML and React, it can't be used to shift text way down to the bottom of a div.

You could use margin:
import React from "react";
import "./styles.css";
export default function App() {
const style3 = {
height: "75px",
marginTop: 'auto'
};
return (
<div className="App">
<div style={style3}>CSS Flexbox</div>
</div>
);
}
Or align-self:
import React from "react";
import "./styles.css";
export default function App() {
const style3 = {
height: "75px",
alignSelf: 'flex-end'
};
return (
<div className="App">
<div style={style3}>CSS Flexbox</div>
</div>
);
}

I noticed you mentioned the div has lots of other information in a more complicated example. I would highly recommend trying out css grid if you haven't already. It allows you to structure the items on your screen very easily.
Here's an example using grid to create the 'holy grail layout' which is by no means the best example but it shows how easy it is to structure divs in different areas of the screen.
https://codepen.io/frazermg/pen/bXbXOR?editors=1100
.container {
display: grid;
grid-template-areas: 'header header header header'
'left content content right'
'left content content right'
'footer footer footer footer';
grid-template-columns: repeat(4, 1fr);
grid-auto-rows: minmax(30vh, auto);
}
.header {
background-color: blue;
grid-area: header;
}
.left {
background-color: green;
grid-area: left;
}
.content {
background-color: #eee;
grid-area: content;
}
.right {
background-color: pink;
grid-area: right;
}
.footer {
background-color: orange;
grid-area: footer;
}
<div class="container">
<div class="header"></div>
<div class="left"></div>
<div class="content"></div>
<div class="right"></div>
<div class="footer"></div>
</div>
Here is an example of nested grids:
https://codepen.io/frazermg/pen/ZgEwVd
This website is very useful for all things css, especially flexbox and grid.
https://css-tricks.com/snippets/css/complete-guide-grid/
I hope this can help you!

What about simply style any span or component with text inside a div like this:
... style={{position:"absolute",bottom:"0px"}} ...

How to vertically and horizontally center a component in react?

How can I achieve absolute centering with CSS-in-JS? When I use the following code, my component moves across the screen. I guess the translate is being applied many times instead of just once. What's going on, and how can I fix it without using a library?
render() {
return (<ComponentASD
style={{
position: 'absolute', left: '50%', top: '50%',
transform: 'translate(-50%, -50%)'
}} />);
}

Another option is to use flex-box.
<div style={{
display: 'flex',
alignItems: 'center',
justifyContent: 'center',
}}>
Hello world
</div>

Your example code works well:
ReactDOM.render(
<div
style={{
position: 'absolute', left: '50%', top: '50%',
transform: 'translate(-50%, -50%)'
}}
>
Hello, world!
</div>,
document.getElementById('root')
);
https://codepen.io/anon/pen/JaLLmX
It has to do something with your layout.

Thanks for the testing+comments! The styling ended up being fine, the issue was somehow caused by the layout of ComponentASD, which is actually MUI's CircularProgress https://material-ui.com/api/circular-progress/#demos
I wrapped that component in a div inside of render and applied the styling to the div, which fixed the problem (keeps it stationary and properly aligned).

This is flexbox you will need to use this on the parent Component.
.Parent {
display: flex,
flexFlow: row nowrap,
justifyContent: center,
alignItems: center,
{
It will center the children vertically and horizontally
You can also align each component as I've shown you below
render() {
return (<Childcomponent
style={{
display: flex,
flexFlow: row nowrap,
justifySelf: center,
alignSelf: center,
}} />);
}

If you want to have a properly scrollable list if the window's height is smaller than the content's height you want to center, you can do this (based on this CSS answer):
<div
style={{
display: "table",
position: "absolute",
height: "100%",
width: "100%",
top: 0,
left: 0
}}
>
<div
style={{
display: "table-cell",
verticalAlign: "middle",
textAlign: "center"
}}
>
// Here comes the content you want to center
</div>
</div>

If you want to use it in a component just call it in the component:
.Login {
text-align: center;
background-color: #2681C6;
min-height: 100vh;}
Your jsx file sould have something like just to call it, using "className":
<div className="Login"><div>