传递属性以创建搜索栏时出错

Question

我试图使搜索输入，将过滤的名称用户将输入。我有两个组件，一个是有搜索输入(app.js)，另一个是有表(table.js)。

我能够获得搜索输入(app.js)的当前值，但当试图将其作为表(table.js)中的道具传递时，它会给出一个错误。

我是新的反应，但从我的理解，我认为我有问题传递useState作为一个道具。

1。搜索输入代码(app.js)

我使用onChange事件来获取输入字段更改时的当前值。

<div className="search">
<div className={classes.search}>
<div className={classes.searchIcon}>
<SearchIcon />
</div>
<InputBase
placeholder="Search..."
classes={{
root: classes.inputRoot,
input: classes.inputInput,
}}
onChange={getSearchTerm}
/>
</div>
</div>

getSearchTerm函数获取当前输入值

const [searchTerm, setSearchTerm] = useState("");
const getSearchTerm = (event) => {
const searchWord = event.target.value;
console.log(searchWord);
setSearchTerm(searchWord)
}

2。表(app.js)传递props

在过滤器函数中传递道具。因此，当在搜索输入中输入输入时，可以得到过滤。

export default function EnhancedTable(props) {
console.log("these r props for table component", props);
<TableBody>
{data
.filter((item) => {
if (props.searchTerm == "") {
return item;
} else if (item.clientName.toLowerCase().includes(props.searchTerm.toLowerCase())) {
return item;
}
})
.map((item, index) => {
return (
<TableRow
hover
role="checkbox"
tabIndex={-1}
>
<TableCell padding="checkbox">
<Checkbox
/>
</TableCell>
<TableCell component="th" scope="row" padding="none">{item.clientName}</TableCell>
<TableCell align="right">{item.clientEmail}</TableCell>
<TableCell align="right">{item.clientWorkPhone}</TableCell>
<TableCell align="right">{item.clientIndustry}</TableCell>
<TableCell align="right">{item.tenantId}</TableCell>
<TableCell align="right">{item.clientWebsite}</TableCell>
<TableCell align="right"><Button style={{ backgroundColor: 'transparent', color: '#5900B4' }} variant="outlined" color="primary" href="#outlined-buttons" >{<CreateIcon />}</Button>
</TableCell>
</TableRow>
)
})}
</TableBody>

3。错误让

[我得到的错误在这里][1]

4。完整搜索输入(app.js)文件，更清晰

function App() {
const [searchTerm, setSearchTerm] = useState("");
const classes = useStyles();
const getSearchTerm = (event) => {
//console.log(inputEl.current.value);
const searchWord = event.target.value;
console.log(searchWord);
setSearchTerm(searchWord)

}
return (
<div className="App">
<div className="wrapper">
<div className="container-table">
<div className="head">
<h5 className='management'>MANAGEMENT</h5>
<div className="head-middle">
<h2>Clients</h2>
<div className="button-collection">
<Button style={{ backgroundColor: '#5900B4', color: '#FFFFFF', fontSize: '15px', fontWeight: '900', width: '206px', height: '42px' }}
variant="contained"
className='add-collection-btn'
startIcon={<AddIcon />}
>
New Collection
</Button>
</div>
</div>
<div className="head-bottom">
<div className="head-button">
<div className="search">
<div className={classes.search}>
<div className={classes.searchIcon}>
<SearchIcon />
</div>
<InputBase
placeholder="Search..."
classes={{
root: classes.inputRoot,
input: classes.inputInput,
}}
onChange={getSearchTerm}
/>
</div>
</div>
<Button style={{ backgroundColor: 'white', color: 'black', width: '100px', height: '40px', marginLeft: '20px', marginRight: '20px' }} variant="contained">Search</Button>
<Button style={{ backgroundColor: 'white', color: 'black', width: '100px', height: '40px' }} variant="contained">Clear</Button>
</div>
<Button style={{
backgroundColor: 'transparent', color: '#5900B4', width: '206px', height: '42px', borderColor: '#5900B4', fontSize: '15px', fontWeight: '900'
}} variant="outlined" color="primary"
startIcon={<FilterListIcon />}
>
SHOW FILTER
</Button>
</div>
<div className="table">
<EnhancedTable
onChange={setSearchTerm}
/>
</div>
</div>
</div>
</div>
</div>
);
}
export default App;

5。完整表(table.js)文件的清晰度

const headCells = [
{ id: 'name', numeric: false, disablePadding: true, label: 'Client Name' },
{ id: 'email', numeric: true, disablePadding: false, label: 'Email' },
{ id: 'phone', numeric: true, disablePadding: false, label: 'Phone' },
{ id: 'industry', numeric: true, disablePadding: false, label: 'Industry' },
{ id: 'contact', numeric: true, disablePadding: false, label: 'Point of Contact' },
{ id: 'website', numeric: true, disablePadding: false, label: 'Website' },
{ id: 'btn-icon', numeric: true, disablePadding: false, label: '' },
];
function EnhancedTableHead(props) {
const { classes, onSelectAllClick, order, orderBy, numSelected, rowCount } = props;

return (
<TableHead>
<TableRow style={{ backgroundColor: '#F5F6F8', height: '120px' }}>
<TableCell padding="checkbox">
<Checkbox
indeterminate={numSelected > 0 && numSelected < rowCount}
checked={rowCount > 0 && numSelected === rowCount}
onChange={onSelectAllClick}
inputProps={{ 'aria-label': 'select all desserts' }}
/>
</TableCell>
{headCells.map((headCell) => (
<TableCell
key={headCell.id}
align={headCell.numeric ? 'right' : 'left'}
padding={headCell.disablePadding ? 'none' : 'normal'}
>
{headCell.label}
</TableCell>
))}
</TableRow>
</TableHead>
);
}
EnhancedTableHead.propTypes = {
classes: PropTypes.object.isRequired,
numSelected: PropTypes.number.isRequired,
order: PropTypes.oneOf(['asc', 'desc']).isRequired,
orderBy: PropTypes.string.isRequired,
};
const useToolbarStyles = makeStyles((theme) => ({
root: {
paddingLeft: theme.spacing(2),
paddingRight: theme.spacing(1),
},
highlight:
theme.palette.type === 'light'
? {
color: theme.palette.secondary.main,
backgroundColor: lighten(theme.palette.secondary.light, 0.85),
}
: {
color: theme.palette.text.primary,
backgroundColor: theme.palette.secondary.dark,
},
title: {
flex: '1 1 100%',
},
}));
const EnhancedTableToolbar = (props) => {
const classes = useToolbarStyles();
return (
<Toolbar>
{
<Typography className={classes.title} variant="h6" id="tableTitle" component="div">
Clients
</Typography>
}
</Toolbar>
);
};
EnhancedTableToolbar.propTypes = {
numSelected: PropTypes.number.isRequired,
};
const useStyles = makeStyles((theme) => ({
root: {
width: '100%',
},
paper: {
width: '100%',
marginBottom: theme.spacing(2),
},
table: {
minWidth: 750,
},
visuallyHidden: {
border: 0,
clip: 'rect(0 0 0 0)',
height: 1,
margin: -1,
overflow: 'hidden',
padding: 0,
position: 'absolute',
top: 20,
width: 1,
},
}));
export default function EnhancedTable(props) {
console.log("these r props for table component", props);

const classes = useStyles();
const [order, setOrder] = React.useState('asc');
const [orderBy, setOrderBy] = React.useState('calories');
const [selected, setSelected] = React.useState([]);
const [page, setPage] = React.useState(0);
const [dense, setDense] = React.useState(false);
const [rowsPerPage, setRowsPerPage] = React.useState(5);

const isSelected = (name) => selected.indexOf(name) !== -1;
const [data, setData] = useState([]);
const getData = async () => {
try {
const data = await axios.get("something");

setData(data.data);
} catch (e) {
console.log("this is error for fetching data", e)
}
};

useEffect(() => {
getData();
}, [])

return (
<div className={classes.root}>
<Paper className={classes.paper}>
<EnhancedTableToolbar numSelected={selected.length} />
<TableContainer>
<Table
className={classes.table}
aria-labelledby="tableTitle"
size={dense ? 'small' : 'medium'}
aria-label="enhanced table"
>
<EnhancedTableHead
classes={classes}
numSelected={selected.length}
order={order}
orderBy={orderBy}
/>
<TableBody>
{data
/*.filter((item) => {
if (searchTerm == "") {
return item;
} else if (item.clientName.toLowerCase().includes(searchTerm.toLowerCase())) {
return item;
}
})*/
.map((item, index) => {
return (
<TableRow
hover
role="checkbox"
tabIndex={-1}
>
<TableCell padding="checkbox">
<Checkbox
/>
</TableCell>
<TableCell component="th" scope="row" padding="none">{item.clientName}</TableCell>
<TableCell align="right">{item.clientEmail}</TableCell>
<TableCell align="right">{item.clientWorkPhone}</TableCell>
<TableCell align="right">{item.clientIndustry}</TableCell>
<TableCell align="right">{item.tenantId}</TableCell>
<TableCell align="right">{item.clientWebsite}</TableCell>
<TableCell align="right"><Button style={{ backgroundColor: 'transparent', color: '#5900B4' }} variant="outlined" color="primary" href="#outlined-buttons" >{<CreateIcon />}</Button>
</TableCell>
</TableRow>
)
})}
</TableBody>
</Table>
</TableContainer>
</Paper>
</div>
);
}

Answer 1

问题是searchTerm不在您的组件范围内，所以这一行…

item.clientName.toLowerCase().includes(searchTerm.toLowerCase())

抛出你看到的错误

无法读取未定义的属性'toLowerCase'

你需要把需要的道具传递给你的组件。

<EnhancedTable searchTerm={searchTerm} />

这也是使用React的useMemo钩子生成过滤结果的绝佳机会

const { searchTerm } = props // extract searchTerm from props
const filtered = useMemo(() => {
if (!searchTerm) {
return data
}
const term = searchTerm.toLowerCase()

return data.filter(({ clientName }) =>
clientName.toLowerCase().includes(term))
}, [ data, searchTerm ])

现在你可以在返回值

中使用filtered代替data

<TableBody>
{filtered.map((item, index) => {
// etc
})}
</TableBody>