我这里有一个很大的React应用程序(与Redux一起使用),它有很大的瓶颈。
我们已经通过使用产品编号或产品名称实施了产品搜索,而这种搜索非常耗时。
问题:如果用户键入某些字符,则这些字符在InputField中的显示确实会延迟。 UI冻结了几秒钟。 在Internet Explorer 11中,搜索几乎无法使用。
这是用于过滤产品的Material UI TextField。
我已经进行了优化:
这就是我们的SearchComponent当前的样子:
import React, { Component } from 'react';
import PropTypes from 'prop-types';
import Downshift from 'downshift';
import TextField from '@material-ui/core/TextField';
import MenuItem from '@material-ui/core/MenuItem';
import Paper from '@material-ui/core/Paper';
import IconTooltip from '../helper/icon-tooltip';
import { translate } from '../../utils/translations';
const propTypes = {
values: PropTypes.arrayOf(PropTypes.shape({})).isRequired,
legend: PropTypes.string,
helpText: PropTypes.string,
onFilter: PropTypes.func.isRequired,
selected: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
isItemAvailable: PropTypes.func,
};
const defaultProps = {
legend: '',
helpText: '',
selected: '',
isItemAvailable: () => true,
};
const mapNullToDefault = selected =>
(selected === null || selected === undefined ? '' : selected);
const mapDefaultToNull = selected => (!selected.length ? null : selected);
class AutoSuggestField extends Component {
shouldComponentUpdate(nextProps) {
return this.props.selected !== nextProps.selected;
}
getLegendNode() {
const { legend, helpText } = this.props;
return (
<legend>
{legend}{' '}
{helpText && helpText.length > 0 ? (
<IconTooltip helpText={helpText} />
) : (
''
)}
</legend>
);
}
handleEvent(event) {
const { onFilter } = this.props;
const value = mapDefaultToNull(event.target.value);
onFilter(value);
}
handleOnSelect(itemId, item) {
const { onFilter } = this.props;
if (item) {
onFilter(item.label);
}
}
render() {
const { values, selected, isItemAvailable } = this.props;
const inputValue = mapNullToDefault(selected);
const paperCSSStyle = {
maxHeight: 230,
overflowY: 'scroll',
};
return (
<div>
<div>{this.getLegendNode()}</div>
<Downshift
inputValue={inputValue}
onSelect={(itemId) => {
const item = values.find(i => i.id === itemId);
this.handleOnSelect(itemId, item);
}}
>
{/* See children-function on https://github.com/downshift-js/downshift#children-function */}
{({
isOpen,
openMenu,
highlightedIndex,
getInputProps,
getMenuProps,
getItemProps,
ref,
}) => (
<div>
<TextField
className="searchFormInputField"
InputProps={{
inputRef: ref,
...getInputProps({
onFocus: () => openMenu(),
onChange: (event) => {
this.handleEvent(event);
},
}),
}}
fullWidth
value={inputValue}
placeholder={translate('filter.autosuggest.default')}
/>
<div {...getMenuProps()}>
{isOpen && values && values.length ? (
<React.Fragment>
<Paper style={paperCSSStyle}>
{values.map((suggestion, index) => {
const isHighlighted = highlightedIndex === index;
const isSelected = false;
return (
<MenuItem
{...getItemProps({ item: suggestion.id })}
key={suggestion.id}
selected={isSelected}
title={suggestion.label}
component="div"
disabled={!isItemAvailable(suggestion)}
style={{
fontWeight: isHighlighted ? 800 : 400,
}}
>
{suggestion.label}
</MenuItem>
);
})}
</Paper>
</React.Fragment>
) : (
''
)}
</div>
</div>
)}
</Downshift>
</div>
);
}
}
AutoSuggestField.propTypes = propTypes;
AutoSuggestField.defaultProps = defaultProps;
export default AutoSuggestField;
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.5.0/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.5.0/umd/react-dom.production.min.js"></script>
似乎我没有发现性能问题,因为它仍然存在。有人可以帮忙吗?