问题描述
我正在尝试将具有继承的 React 类转换为功能组件,并且不会错过任何功能。到目前为止,我阅读了大量文章,但不知道该怎么做。主要问题是我的父组件修改了子组件的状态。
# Base class
class BaseTable extends React.Component {
// function to filter table when search text is changed
_onChangeText = (ev,text) => {
// storing filterText as a state,so onDropdownChange() can refresh filter
this.setState({ filterText: text });
if (this.state.items[0] && this.state.items[0].hasOwnProperty(this.state.filterBy)) {
// refreshing the filteredItems array with new query
this.setState({
filteredItems: text ? this.state.items.filter(item => item[this.state.filterBy].toLowerCase().indexOf(text.toLowerCase()) > -1) : this.state.items,selectedPageIndex: 0
});
}
};
}
export default BaseTable;
class SpecificTable extends BaseTable {
constructor(props) {
super(props);
}
this.state = {
items: [],filteredItems: [],filterText: "",selectedPageIndex: 0,isError: false,errMsg: ''
};
return (
<TextField
label="Search Query:"
onChange={this._onChangeText}
styles={controlStyles}
value={this.state.filterText}
/>
);
}
export default SpecificTable;
目标是将其转换为没有类的功能组件并重用 BaseTable 中的那些函数,因为我有一些“SpecificTables”。我正在考虑创建 ReactContext,但仍然有问题。
解决方法
编辑:添加指向我对 composition over inheritance
的评论的链接在功能组件中,您可以通过创建一个可重复使用的钩子来实现,该钩子可以被以前扩展 BaseTable 的各种表组件使用
const useBaseTable = () => {
const [state,setState] = useState(your_base_state);
const onChangeText = useCallback((arg) => {
... your onChangeText
},[...relevant dependencies]);
// return your state,setState (if necessary),and your callback
// in reality,you can return whatever you want from this hook
return [state,setState,onChangeText];
}