Desired outcome = change image and bg color every x seconds.
Problem I'm running into = it is not displaying every color and image. It is going from pink -> orange -> pink -> orange, skipping blue and green.
import * as React from 'react';
// Images
import heroPink from './hero-pink.png';
import heroBlue from './hero-blue.png';
import heroOrange from './hero-orange.png';
import heroGreen from './hero-green.png';
import logo from './oddballs_logo.svg';
const colors = [
"#F9B199",
"#237E95",
"#D79446",
"#C2C138"
];
const images = [
heroPink,
heroBlue,
heroOrange,
heroGreen
];
export default function App() {
const [value, setValue] = React.useState(0);
React.useEffect(() => {
const interval = setInterval(() => {
setValue((v) => (v === 3 ? 0 : v + 1));
}, 1000);
}, []);
return (
<div className="App" style={{ backgroundColor: colors[value] }}>
<img src={images[value]}/>
</div>
);
}
You need to clear your interval with the return statement. That means, in every un-mount the interval will clear and when this component will mount, new interval will register. It works fine for me, hope your problem will solve also.
React.useEffect(() => {
const interval = setInterval(() => {
setValue((v) => {
return v === 4 ? 0 : v + 1;
});
}, 1000);
return () => clearInterval(interval);
}, []);
Remember, clearing any interval events is important. Otherwise it occurs memory leak.
Here is the full example:
import React from "react";
const colors = ["#92c952", "#771796", "#24f355", "#d32776", "#f66b97"];
const images = [
"https://via.placeholder.com/150/92c952",
"https://via.placeholder.com/150/771796",
"https://via.placeholder.com/150/24f355",
"https://via.placeholder.com/150/d32776",
"https://via.placeholder.com/150/f66b97"
];
export default function App() {
const [value, setValue] = React.useState(0);
React.useEffect(() => {
const interval = setInterval(() => {
setValue((v) => {
return v === 4 ? 0 : v + 1;
});
}, 1000);
return () => clearInterval(interval);
}, []);
return (
<div className="App" style={{ backgroundColor: colors[value] }}>
<img src={images[value]} alt="img" style={{ border: "3px solid" }} />
</div>
);
}
You can use setInterval function to achieve the behavior. Here I have used two states for color and image indexes.
const colors = ["#eb4034", "#ebdb34", "#34eb37"];
const images = [
"https://images.unsplash.com/photo-1649894158666-c10421960f13?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=2071&q=50",
"https://images.unsplash.com/photo-1648737154448-ccf0cafae1c2?ixlib=rb-1.2.1&ixid=MnwxMjA3fDF8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=2070&q=80",
"https://images.unsplash.com/photo-1585974738771-84483dd9f89f?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1072&q=80"
];
export default function App() {
const [image, setImage] = useState(0);
const [color, setColor] = useState(0);
useEffect(() => {
const interval = setInterval(() => {
if (image === images.length - 1 && color === colors.length - 1) {
setImage(0);
setColor(0);
} else {
setImage(image + 1);
setColor(color + 1);
}
}, 3000);
return () => {
clearInterval(interval);
};
}, [image, color]);
return (
<div style={{ backgroundColor: `${colors[color]}`, padding: "20px" }}>
<img src={images[image]} style={{ width: "100%" }} alt="img" />
</div>
);
}
Also cleanup the interval unmounting phase.