Lodash 去抖 async/await
Lodash debounce async/await
我试图在执行 api 调用之前向我的应用程序添加去抖动。但是,当我引入 debouce 时,似乎我的 await 被忽略了,并且由于缺少值
而调用了函数
export default class App extends Component {
state = {
search: "Cats",
results: []
};
async search(text) {
const giphy = {
baseURL: "https://api.giphy.com/v1/gifs/search",
apiKey: "0UTRbFtkMxAplrohufYco5IY74U8hOes",
tag: text
};
let giphyURL = encodeURI(
giphy.baseURL + "?api_key=" + giphy.apiKey + "&q=" + giphy.tag
);
let data = await fetch(giphyURL);
return data.json();
}
async componentDidMount() {
// get default search
this.onSearch(this.state.text);
}
setSearch = e => {
this.setState({ search: e.target.value });
debounce(() => this.onSearch(this.state.search), 100);
};
async onSearch(text) {
console.log("text:", text);
try {
let response = await this.search(this.state.search);
console.log("data:", response.data);
// console.log(data.results);
let data = response.data.reduce((t, { title, id, images }) => {
t.push({ title, id, url: images.downsized_medium.url });
return t;
}, []);
this.setState({ results: data });
} catch (e) {
console.error("Failed Fetch", e.toString());
}
}
render() {
return (
<main className="app">
<Header>This is my Gif Search App</Header>
<nav className="navbar">
<SearchBox onSearch={this.setSearch} value={this.state.search} />
</nav>
<aside className="sidebar">Sidebar Bar</aside>
<section className="results">
<Results results={this.state.results} />
</section>
<footer className="footer">
<p className="footer-text">Copyright @funssies 2019</p>
</footer>
</main>
);
}
}
错误:在 setSearch 方法中,我将获取数据的调用包装在 debounce 中,但没有任何反应。
onSearch 是一个异步函数。 debounce 的参数函数也必须是异步的。是的,就像蝙蝠侠指出的那样。
const debouncedOnSearch = debounce(async () => {
this.onSearch(this.state.search)
}, 100);
setSearch = e => {
this.setState({ search: e.target.value });
debouncedOnSearch();
};
这应该有效。另一个类似的问题我.
希望对您有所帮助。
我想我明白了。 Deboune returns 一个函数。然后我必须调用那个函数
例如:
let myFunc = debounce(this.someFunction,100)
// call debounced function
myFunc()
我将我的功能更改为:
delayedSearch = debounce(this.onSearch, 1500);
setSearch = e => {
this.setState({ search: e.target.value });
this.delayedSearch(this.state.search);
};
在这里找到帮助:lodash debounce not working in anonymous function
这是一个简单的异步版本(适用于 debounce npm)
export default function MyComponent() {
const [searchTerm, setSearchTerm] = useState('');
const launchSearch = async (searchValue: string): Promise<any> => {
console.log(searchValue);
};
const delayedSearch = useCallback(
debounce(async (searchTerm) => {
await launchSearch(searchTerm);
}, 2000),
[]
);
useEffect(() => {
if (searchTerm.length >= 2) {
delayedSearch(searchTerm);
}
}, [searchTerm]);
...
}
除了上述答案之外,如果您的 throttled/debounced 处理程序使用 props 或 state,如下所示:
const { fetcherFunctionFromProps } = props;
const eventHandler = async () => {
const resp = await fetcherFunctionFromProps();
};
const debouncedEventHandler = useMemo(
() => throttle(eventHandler, 300)
), [fetcherFunctionFromProps]);
而且它不起作用,
您可以将其重构为以下内容:
const { fetcherFunctionFromProps } = props;
const eventHandler = async (fetcher) => {
const resp = await fetcher();
};
const debouncedEventHandler = useMemo(() => throttle(eventHandler, 300), []);
...
<Component onClick={() => debouncedEventHandler(fetcherFunctionFromProps)}>
我试图在执行 api 调用之前向我的应用程序添加去抖动。但是,当我引入 debouce 时,似乎我的 await 被忽略了,并且由于缺少值
而调用了函数export default class App extends Component {
state = {
search: "Cats",
results: []
};
async search(text) {
const giphy = {
baseURL: "https://api.giphy.com/v1/gifs/search",
apiKey: "0UTRbFtkMxAplrohufYco5IY74U8hOes",
tag: text
};
let giphyURL = encodeURI(
giphy.baseURL + "?api_key=" + giphy.apiKey + "&q=" + giphy.tag
);
let data = await fetch(giphyURL);
return data.json();
}
async componentDidMount() {
// get default search
this.onSearch(this.state.text);
}
setSearch = e => {
this.setState({ search: e.target.value });
debounce(() => this.onSearch(this.state.search), 100);
};
async onSearch(text) {
console.log("text:", text);
try {
let response = await this.search(this.state.search);
console.log("data:", response.data);
// console.log(data.results);
let data = response.data.reduce((t, { title, id, images }) => {
t.push({ title, id, url: images.downsized_medium.url });
return t;
}, []);
this.setState({ results: data });
} catch (e) {
console.error("Failed Fetch", e.toString());
}
}
render() {
return (
<main className="app">
<Header>This is my Gif Search App</Header>
<nav className="navbar">
<SearchBox onSearch={this.setSearch} value={this.state.search} />
</nav>
<aside className="sidebar">Sidebar Bar</aside>
<section className="results">
<Results results={this.state.results} />
</section>
<footer className="footer">
<p className="footer-text">Copyright @funssies 2019</p>
</footer>
</main>
);
}
}
错误:在 setSearch 方法中,我将获取数据的调用包装在 debounce 中,但没有任何反应。
onSearch 是一个异步函数。 debounce 的参数函数也必须是异步的。是的,就像蝙蝠侠指出的那样。
const debouncedOnSearch = debounce(async () => {
this.onSearch(this.state.search)
}, 100);
setSearch = e => {
this.setState({ search: e.target.value });
debouncedOnSearch();
};
这应该有效。另一个类似的问题我
希望对您有所帮助。
我想我明白了。 Deboune returns 一个函数。然后我必须调用那个函数
例如:
let myFunc = debounce(this.someFunction,100)
// call debounced function
myFunc()
我将我的功能更改为:
delayedSearch = debounce(this.onSearch, 1500);
setSearch = e => {
this.setState({ search: e.target.value });
this.delayedSearch(this.state.search);
};
在这里找到帮助:lodash debounce not working in anonymous function
这是一个简单的异步版本(适用于 debounce npm)
export default function MyComponent() {
const [searchTerm, setSearchTerm] = useState('');
const launchSearch = async (searchValue: string): Promise<any> => {
console.log(searchValue);
};
const delayedSearch = useCallback(
debounce(async (searchTerm) => {
await launchSearch(searchTerm);
}, 2000),
[]
);
useEffect(() => {
if (searchTerm.length >= 2) {
delayedSearch(searchTerm);
}
}, [searchTerm]);
...
}
除了上述答案之外,如果您的 throttled/debounced 处理程序使用 props 或 state,如下所示:
const { fetcherFunctionFromProps } = props;
const eventHandler = async () => {
const resp = await fetcherFunctionFromProps();
};
const debouncedEventHandler = useMemo(
() => throttle(eventHandler, 300)
), [fetcherFunctionFromProps]);
而且它不起作用,
您可以将其重构为以下内容:
const { fetcherFunctionFromProps } = props;
const eventHandler = async (fetcher) => {
const resp = await fetcher();
};
const debouncedEventHandler = useMemo(() => throttle(eventHandler, 300), []);
...
<Component onClick={() => debouncedEventHandler(fetcherFunctionFromProps)}>