我正在尝试将lodash的debouncing添加到搜索函数中,从输入onChange事件调用。下面的代码生成一个类型错误'function is function',我理解,因为lodash期待一个函数。这样做的正确方法是什么,可以全部内联完成吗?到目前为止,我几乎尝试了所有的例子都无济于事。
search(e){
let str = e.target.value;
debounce(this.props.relay.setVariables({ query: str }), 500);
},
答案 0 :(得分:17)
debounce函数可以在JSX中内联传递,也可以直接设置为类方法,如下所示:
search: _.debounce(function(e) {
console.log('Debounced Event:', e);
}, 1000)
小提琴: https://jsfiddle.net/woodenconsulting/69z2wepo/36453/
如果你正在使用es2015 +,你可以直接在constructor
或生命周期方法componentWillMount
中定义你的去抖动方法。
<强>示例:强>
class DebounceSamples extends React.Component {
constructor(props) {
super(props);
// Method defined in constructor, alternatively could be in another lifecycle method
// like componentWillMount
this.search = _.debounce(e => {
console.log('Debounced Event:', e);
}, 1000);
}
// Define the method directly in your class
search = _.debounce((e) => {
console.log('Debounced Event:', e);
}, 1000)
}
答案 1 :(得分:1)
这不是那么简单的问题
一方面只是解决你遇到的错误,你需要在函数中包含s
:
indexOf()
另一方面,我相信去抖动逻辑必须包含在Relay中。
答案 2 :(得分:1)
这是我整天搜索一次后要做的。
const MyComponent = (props) => {
const [reload, setReload] = useState(false);
useEffect(() => {
if(reload) { /* Call API here */ }
}, [reload]);
const callApi = () => { setReload(true) }; // You might be able to call API directly here, I haven't tried
const [debouncedCallApi] = useState(() => _.debounce(callApi, 1000));
function handleChange() {
debouncedCallApi();
}
return (<>
<input onChange={handleChange} />
</>);
}
答案 3 :(得分:1)
我发现这里的很多答案都过于复杂或不准确(即实际上并未消除抖动)。这是一个带检查的简单解决方案:
const [count, setCount] = useState(0); // simple check debounce is working
const handleChangeWithDebounce = _.debounce(async (e) => {
if (e.target.value && e.target.value.length > 4) {
// TODO: make API call here
setCount(count + 1);
console.log('the current count:', count)
}
}, 1000);
<input onChange={handleChangeWithDebounce}></input>
答案 4 :(得分:1)
对于功能性反应组件,请尝试使用 useCallback
。 useCallback
会记住您的 debounce 函数,以便在组件重新渲染时不会一次又一次地重新创建它。如果没有 useCallback
,去抖动功能将不会与下一个击键同步。
`
import {useCallback} from 'react';
import _debouce from 'lodash/debounce';
import axios from 'axios';
function Input() {
const [value, setValue] = useState('');
const debounceFn = useCallback(_debounce(handleDebounceFn, 1000), []);
function handleDebounceFn(inputValue) {
axios.post('/endpoint', {
value: inputValue,
}).then((res) => {
console.log(res.data);
});
}
function handleChange (event) {
setValue(event.target.value);
debounceFn(event.target.value);
};
return <input value={value} onChange={handleChange} />
}
`
答案 5 :(得分:0)
对于您的情况,应为:
search = _.debounce((e){
let str = e.target.value;
this.props.relay.setVariables({ query: str });
}, 500),
答案 6 :(得分:0)
class MyComp extends Component {
debounceSave;
constructor(props) {
super(props);
}
this.debounceSave = debounce(this.save.bind(this), 2000, { leading: false, trailing: true });
}
save()是要调用的函数
debounceSave()是您实际调用的函数(多次)。
答案 7 :(得分:0)
这对我有用:
handleChange(event) {
event.persist();
const handleChangeDebounce = _.debounce((e) => {
if (e.target.value) {
// do something
}
}, 1000);
handleChangeDebounce(event);
}
答案 8 :(得分:0)
这是正确的 FC 方法 @
Aximili 回答只触发一次
import { SyntheticEvent } from "react"
export type WithOnChange<T = string> = {
onChange: (value: T) => void
}
export type WithValue<T = string> = {
value: T
}
// WithValue & WithOnChange
export type VandC<A = string> = WithValue<A> & WithOnChange<A>
export const inputValue = (e: SyntheticEvent<HTMLElement & { value: string }>): string => (e.target as HTMLElement & { value: string }).value
const MyComponent: FC<VandC<string>> = ({ onChange, value }) => {
const [reload, setReload] = useState(false)
const [state, setstate] = useState(value)
useEffect(() => {
if (reload) {
console.log('called api ')
onChange(state)
setReload(false)
}
}, [reload])
const callApi = () => {
setReload(true)
} // You might be able to call API directly here, I haven't tried
const [debouncedCallApi] = useState(() => _.debounce(callApi, 1000))
function handleChange(x:string) {
setstate(x)
debouncedCallApi()
}
return (<>
<input
value={state} onChange={_.flow(inputValue, handleChange)} />
</>)
}
答案 9 :(得分:-1)
@Aximili
const [debouncedCallApi] = useState(() => _.debounce(callApi, 1000));
看起来很奇怪:)我用useCallback
宣传解决方案:
const [searchFor, setSearchFor] = useState('');
const changeSearchFor = debounce(setSearchFor, 1000);
const handleChange = useCallback(changeSearchFor, []);
答案 10 :(得分:-2)
const delayedHandleChange = debounce(eventData => someApiFunction(eventData), 500);
const handleChange = (e) => {
let eventData = { id: e.id, target: e.target };
delayedHandleChange(eventData);
}