我正在嘗試在 Material UI 中使用 Refs 來更改 Image src，但它給了我一個“未定義”錯誤。看起來鏈接正在創建但沒有被應用為 Images src，我覺得問題出在第 10 行。
CodeSandBox - 
import * as React from "react";
import { styled } from "@mui/material/styles";
import Grid from "@mui/material/Grid";
import D34, { useEffect, useState } from "react";
import Paper from "@mui/material/Paper";
import RootRef from "@material-ui/core/RootRef";
import Typography from "@mui/material/Typography";
import ButtonBase from "@mui/material/ButtonBase";
import Data from "./abc.json";
import { red } from "@mui/material/colors";
const Img = styled("img")({
margin: "auto",
display: "block",
maxWidth: "100%",
maxHeight: "100%"
});
export default function ComplexGrid() {
const [loading] = useState(true);
const imageRef = React.useRef();
let txt = "IGO";
useEffect(() => {
console.log(imageRef.current.src);
if (imageRef.current.src === "")
imageRef.current.src = `https://flightaware.com/images/airline_logos/90p/${txt}.png`;
}, [loading, imageRef]);
return (
<div className="hello">
<Img alt="complex" ref={imageRef} />
{Data.response.map((post) => {
return (
<Paper
sx={{
pt: 1,
border: 1,
boxShadow: 0,
mt: 1,
maxWidth: 900,
flexGrow: 1,
backgroundColor: (theme) =>
theme.palette.mode === "dark" ? "#1A2027" : "#fff"
}}
>
<Grid container spacing={2}>
<Grid item>
<ButtonBase sx={{ width: 128, height: 128 }}>
{/* <Img alt="complex" ref={imageRef} /> */}
</ButtonBase>
</Grid>
<Grid item xs={12} sm container>
<Grid item xs container direction="column" spacing={2}>
<Grid item xs>
<Typography
gutterBottom
variant="subtitle1"
component="div"
>
Standard license
</Typography>
<Typography variant="body2" gutterBottom>
Full resolution 1920x1080 ? JPEG
</Typography>
<Typography variant="body2" color="text.secondary">
ID: 1030114
</Typography>
</Grid>
<Grid item></Grid>
</Grid>
<Grid item>
<Typography
variant="subtitle1"
component="div"
sx={{ px: 2, p: 2 }}
>
$19.00
</Typography>
</Grid>
</Grid>
</Grid>
</Paper>
);
})}
</div>
);
}
希望對您有所幫助。謝謝
uj5u.com熱心網友回復：
您可以使用參考串列來更改影像，就像您正在做的那樣。我讓你一個功能代碼，它就像我認為你想要的那樣作業:)
import * as React from "react";
import { styled } from "@mui/material/styles";
import Grid from "@mui/material/Grid";
import D34, { useEffect, useState } from "react";
import Paper from "@mui/material/Paper";
import Typography from "@mui/material/Typography";
import ButtonBase from "@mui/material/ButtonBase";
import Data from "./abc.json";
const Img = styled("img")({
margin: "auto",
display: "block",
maxWidth: "100%",
maxHeight: "100%"
});
export default function ComplexGrid() {
const [loading] = useState(true);
const imagesRef = [];
let txt = "IGO";
useEffect(() => {
imagesRef.forEach((refImg) => {
refImg.src = `https://flightaware.com/images/airline_logos/90p/${txt}.png`;
});
/*imageRef.current.src = `https://flightaware.com/images/airline_logos/90p/${txt}.png`;
console.log(imageRef.current.src);*/
}, [loading]);
return (
<div className="hello">
{Data.response.map((post, posPost) => {
return (
<Paper
sx={{
pt: 1,
border: 1,
boxShadow: 0,
mt: 1,
maxWidth: 900,
flexGrow: 1,
backgroundColor: (theme) =>
theme.palette.mode === "dark" ? "#1A2027" : "#fff"
}}
>
<Grid container spacing={2}>
<Grid item>
<ButtonBase sx={{ width: 128, height: 128 }}>
<Img alt="complex" ref={(imageRef) => {
if (!imagesRef[posPost]) {
imagesRef.push(imageRef);
}
}} />
</ButtonBase>
</Grid>
<Grid item xs={12} sm container>
<Grid item xs container direction="column" spacing={2}>
<Grid item xs>
<Typography
gutterBottom
variant="subtitle1"
component="div"
>
Standard license
</Typography>
<Typography variant="body2" gutterBottom>
Full resolution 1920x1080 ? JPEG
</Typography>
<Typography variant="body2" color="text.secondary">
ID: 1030114
</Typography>
</Grid>
<Grid item></Grid>
</Grid>
<Grid item>
<Typography
variant="subtitle1"
component="div"
sx={{ px: 2, p: 2 }}
>
$19.00
</Typography>
</Grid>
</Grid>
</Grid>
</Paper>
);
})}
</div>
);
}
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