我应该把 JavaScript 代码放在哪里，以便在渲染完成后调用插件。
<html>
<head>
<script src='https://cdnjs.cloudflare.com/ajax/libs/es6-promise/3.2.2/es6-promise.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/react/15.2.1/react.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/react/15.2.1/react-dom.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/axios/0.13.1/axios.min.js'></script>
<script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>
</head>
<body>
<div id="root"></div>
<script type="text/babel">
const REST_API = 'users.json';
// The root component
const App = props => (
<div className="app">
<UserListContainer />
</div>
);
// Container
class UserListContainer extends React.Component {
constructor(props) {
super(props);
this.state = {
users: [{
name: 'Loading data...'
}]
};
}
loadData() {
axios.get(REST_API).then((response) => {
//console.log(response.data);
this.setState({
users: response.data
})
});
}
// Life cycles hooks
// facebook.github.io/react/docs/component-specs.html
componentWillMount() {};
componentDidMount() {
// Data is loaded async, therefore will be inserted after first DOM rendering
this.loadData();
};
componentWillReceiveProps(nextProps) {};
shouldComponentUpdate(nextProps, nextState) {
return true;
};
componentWillUpdate(nextProps, nextState) {};
componentDidUpdate(prevProps, prevState) {};
componentWillUnmount() {};
render() {
return (<UserList users={this.state.users} />);
};
}
// Presentation
const UserItem = (user, index) => (
<li key={index}>
<div className="header">
<div className="name"> {user.name}</div>
<div className="index">{(index+1)}</div>
</div>
<div className="date">
<i className="fa fa-date" aria-hidden="true"></i>
<span>{user.date}</span>
</div>
<div className="contact">
<i className="fa fa-phone" aria-hidden="true"></i>
<span>{user.phone}</span>
</div>
</li>
);
const UserList = props => (
<div className="user-list">
<h1>React ES6 Ajax, Container and Presentation - example</h1>
<ul>
{props.users.map(UserItem)}
</ul>
</div>
);
// Render
ReactDOM.render(
<App />, document.getElementById('root')
);
</script>
</body>
</html>
我把它添加到
componentDidUpdate(prevProps, prevState) {
alert();
};
然后，在第一个元素之后，警报功能开始工作，
这些是我的实际文件 - https://drive.google.com/drive/folders/1G7UOaCFS_521hfZc4-jNeLGiKR4XaQjP?usp=sharing
最佳答案
如果我正确理解您的要求，那么 componentDidUpdate() Hook 将是用于访问 DOM(并调用您的插件)的正确 Hook 。这将在您的组件呈现后调用。
作为state in the official docs对于 componentDidUpdate():
Use this as an opportunity to operate on the DOM when the component has been updated. This is also a good place to do network requests as long as you compare the current props to previous props (e.g. a network request may not be necessary if the props have not changed).
需要注意的关键是 componentDidUpdate() 钩子(Hook)不会在第一次渲染时触发。
更新
要解决这个“首次渲染”问题，您可以使用可以传递给 setState(state, callback) 的可选回调。此回调 在您的组件呈现后(在状态更改之后)触发。
在你的情况下，你可以这样做:
loadData() {
axios.get(REST_API).then((response) => {
//console.log(response.data);
this.setState({ users: response.data }, () => {
// When this callback is invoked, the component has been
// rendered and the DOM can be safely accessed
})
});
}
关于javascript - ReactJS - 在 ajax 函数呈现数据后执行 javascript 代码，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52158612/