我想用 React 和 Typescript 从这个 Codepen 重新创建这个下划线效果
密码笔: https://codepen.io/krakruhahah/pen/jOzwXww
我认为下面代码中的问题是接口(interface),我开始声明我的类型,但它仍然无法识别它们。它说他们是任何。但是 max 被声明为 number 但仍显示为 any。我不确定为什么。这些功能被描述为注释。
tsx:
import React from 'react';
import Typography from '@mui/material/Typography';
import { Box } from '@mui/material';
interface Props {
max: number;
}
const styles = {
body: {
width: "80%",
margin: "10vw auto",
},
heading: {
fontFamily: "Playfair Display, serif",
fontSize: "10vw",
},
"subheading": {
fontFamily: "Open Sans, sans-serif",
fontSize: "1em",
lineHeight: "1.5",
},
"@media screen and (min-width: 40em)": {
body: {
width: "50%",
},
heading:{
fontSize: "6vw",
},
subheading: {
fontSize: "1.75vw",
}
},
"underline--magical": {
backgroundImage: "linear-gradient(120deg, #84fab0 0%, #8fd3f4 100%)",
backgroundRepeat: "no-repeat",
backgroundSize: "100% 0.2em",
backgroundPosition: "0 88%",
transition: "backgroundSize 0.25s ease-in",
"&:hover": {
backgroundSize: "100% 88%",
},
},
};
function Effect(props: Props) {
// VARIABLES
const magicalUnderlines = Array.from(document.querySelectorAll('.underline--magical'));
const gradientAPI = 'https://gist.githubusercontent.com/wking-io/3e116c0e5675c8bcad8b5a6dc6ca5344/raw/4e783ce3ad0bcd98811c6531e40256b8feeb8fc8/gradient.json';
// HELPER FUNCTIONS
// 1. Get random number in range. Used to get random index from array.
const randNumInRange = max => Math.floor(Math.random() * (max - 1));
// 2. Merge two separate array values at the same index to
// be the same value in new array.
const mergeArrays = (arrOne, arrTwo) => arrOne
.map((item, i) => `${item} ${arrTwo[i]}`)
.join(', ');
// 3. Curried function to add a background to array of elms
const addBackground = (elms) => (color) => {
elms.forEach(el => {
el.style.backgroundImage = color;
});
}
// 4. Function to get data from API
const getData = async(url): Promise<XMLHttpRequest> => {
const response = await fetch(url);
const data = await response.json();
return data.data;
}
// 5. Partial Application of addBackground to always apply
// background to the magicalUnderlines constant
const addBackgroundToUnderlines = addBackground(magicalUnderlines);
// GRADIENT FUNCTIONS
// 1. Build CSS formatted linear-gradient from API data
const buildGradient = (obj) => `linear-gradient(${obj.direction}, ${mergeArrays(obj.colors, obj.positions)})`;
// 2. Get single gradient from data pulled in array and
// apply single gradient to a callback function
const applyGradient = async(url, callback): Promise<XMLHttpRequest> => {
const data = await getData(url);
const gradient = buildGradient(data[randNumInRange(data.length)]);
callback(gradient);
}
// RESULT
applyGradient(gradientAPI, addBackgroundToUnderlines);
return (
<Box>
<Typography sx={styles.heading}>
Look At This <span style={styles['underline--magical']}>Pretty</span> Underline
</Typography>
<Typography sx={styles.subheading}>
Wow this one is super incredibly cool, and this{' '}
<span style={styles['underline--magical']}>one is on Multiple Lines!</span> I wish I had found this like thirty
projects ago when I was representing the lollipop guild.
</Typography>
</Box>
);
}
export { Effect };
最佳答案
linear-gradient
我们需要一串元组。我创建了一个辅助函数 生成梯度范围数组 得到这个字符串。应用程序.tsx
import styled from "@emotion/styled";
import Typography from "@mui/material/Typography";
import Box from "@mui/material/Box";
import { Underline } from "./Underline";
import useGradient from "./useGradient";
const Heading = styled(Typography)`
font-family: "Playfair Display", serif;
font-size: 10vw;
@media screen and (min-width: 40em) {
font-size: 6vw;
}
`;
const Subheading = styled(Typography)`
font-family: "Open Sans", sans-serif;
font-size: 1em;
@media screen and (min-width: 40em) {
font-size: 1.75vw;
}
`;
export default function App() {
const gradient = useGradient();
return (
<div className="App">
<Box>
<Heading>
Look At This <Underline gradient={gradient}>Pretty</Underline>{" "}
Underline
</Heading>
<Subheading>
Wow this one is super incredibly cool, and this{" "}
<Underline gradient={gradient}>one is on Multiple Lines!</Underline> I
wish I had found this like thirty projects ago when I was representing
the lollipop guild.
</Subheading>
</Box>
</div>
);
}
使用渐变.tsimport { useEffect, useState } from "react";
import { generateGradientRangeArray, randNumInRange } from "./Helpers";
import { GradientType, IResult } from "./types";
const GRADIENT_API =
"https://gist.githubusercontent.com/wking-io/3e116c0e5675c8bcad8b5a6dc6ca5344/raw/4e783ce3ad0bcd98811c6531e40256b8feeb8fc8/gradient.json";
const useGradient = () => {
const [gradients, setGradients] = useState<GradientType>();
useEffect(() => {
const getData = async (url: string): Promise<void> => {
// get the data from the api
const response = await fetch(url);
const result = (await response.json()) as IResult;
// Get single gradient from data pulled in array
const gradient = result.data[randNumInRange(result.data.length)];
const transform = generateGradientRangeArray(gradient);
// set state with the result
setGradients(transform);
};
// Catching errors
getData(GRADIENT_API).catch(console.error);
}, []);
return gradients;
};
export default useGradient;
下划线.tsximport styled from "@emotion/styled";
import { Props, GradientType } from "./types";
const UnderlineStyle = styled.span<{ gradient: GradientType }>`
background-image: linear-gradient(
${(props) => props.gradient.direction},
${(props) => props.gradient.range}
);
background-repeat: no-repeat;
background-size: 100% 0.2em;
background-position: 0 88%;
transition: background-size 0.25s ease-in;
&:hover {
background-size: 100% 88%;
}
`;
export const Underline = ({ children, gradient }: Props) => {
if (!gradient) return null;
return <UnderlineStyle gradient={gradient}>{children}</UnderlineStyle>;
};
助手.tsimport { IGradient, GradientType } from "./types";
/// HELPER FUNCTIONS
// Get random number in range. Used to get random index from array.
export const randNumInRange = (max: number) =>
Math.floor(Math.random() * (max - 1));
// Create range of colors for gradient
export const generateGradientRangeArray = (data: IGradient): GradientType => {
const { colors, direction, name, positions } = data;
const rangeColorsArray: string[] = [];
for (const clr in colors) {
for (const pos in positions) {
if (clr === pos) {
rangeColorsArray.push(`${colors[clr]} ${positions[pos]},`);
}
}
}
const createGradientString = rangeColorsArray.join(" ").slice(0, -1);
return { name, direction, range: createGradientString };
};
类型.tsimport { ReactNode } from "react";
export interface IGradient {
name: string;
direction: string;
colors: string[];
positions: string[];
}
export type GradientType = { range: string } & Pick<
IGradient,
"name" | "direction"
>;
export interface IResult {
data: IGradient[];
}
export interface Props {
children: ReactNode;
gradient?: GradientType;
}
关于javascript - 在 React 中使用渐变 API 自定义下划线,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/73116434/