当父状态传递给子组件更改时,我在重新渲染组件时遇到问题。 MapNav 组件包含触发方法更改当前显示的弹出窗口的按钮。我的问题是当有人点击 zaloguj 或 wyloguj 时重新渲染 UserPopup 按钮,它应该可以工作,但不能,我也不知道出了什么问题。想要在 isLoggedIn 状态更改时触发动画,并且还有一件事 logIn 方法正确更改状态。 isLoggedIn 状态只是暂时的,稍后我会将其更改为使用存储。我正在尝试编写尽可能多的功能组件,但在某些情况下我无法避免使用状态,并且我打赌我的代码中存在问题,因此我将感谢所有改进提示。
const MapNav = (props) => {
return <div className={'mapNavContainer'}>
<ul className={'navList'}>
<li><a href="#about"><i className={"glyphicon glyphicon-fullscreen"} /></a></li>
<li><a href="#about"><i className={"glyphicon glyphicon-chevron-left"} /></a></li>
<li><a href="#about"><i className={"glyphicon glyphicon-chevron-right"} /></a></li>
<li><a href="#about"><i className={"glyphicon glyphicon-map-marker"} /></a></li>
<li><a href="#" onClick={props.onUserIconClick}><i className={"glyphicon glyphicon-user"} /></a></li>
<li><a href="#" onClick={props.onInfoClick}><i className={"glyphicon glyphicon-info-sign"} /></a></li>
</ul>
</div>
}
const UserPopup = (props) => {
return <div>
{(props.isLoggedIn) ? (
<div className={'navPopups col-sm-3 panel panel-default'}>
<div className={"panel-heading"}>Zalogowany</div>
<div className={"panel-body"}>
<button type='submit' onClick={props.logIn}>wyloguj</button>
</div>
</div>
) : (
<div className={'navPopups col-sm-3 panel panel-default'}>
<div className={"panel-heading"}>Niezalogowany</div>
<div className={"panel-body"}>
<button type='submit' onClick={props.logIn}>Zaloguj</button>
</div>
</div>
)
}
</div>;
};
function Welcome(props) {
return <div className={'navPopups col-sm-3 panel panel-default'}>
<div className={"panel-heading"}>Informacje o Autorze.</div>
<div className={"panel-body"}>
Basic panel example
</div>
</div>;
}
class MapHeader extends React.Component {
constructor(props) {
super(props);
this.state = {
currentPopup: null,
isLoggedIn: false,
username: 'gregorowicz.k@gmail.com',
};
this.onInfoClick = this.onInfoClick.bind(this);
this.onUserIconClick = this.onUserIconClick.bind(this);
this.logIn = this.logIn.bind(this);
}
onInfoClick = (e) => {
e.preventDefault();
this.setPopup(<Welcome />);
}
onUserIconClick = (e) => {
e.preventDefault();
const loginPopup = <UserPopup isLoggedIn={this.state.isLoggedIn} username={this.state.username} logIn={this.logIn} />;
this.setPopup(loginPopup);
}
setPopup = (obj) => {
this.state.currentPopup === null ? this.setState({ currentPopup: obj }) : this.setState({ currentPopup: null });
}
logIn = (e) => {
this.setState({ isLoggedIn: !this.state.isLoggedIn });
}
render() {
return (
<nav className={'header'}>
<div className={'container-fluid'}>
<div className={"navbar-header"}>
<button type="button" className={"navbar-toggle collapsed"} data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span className={"sr-only"}>Toggle navigation</span>
<span className={"icon-bar"} />
<span className={"icon-bar"} />
<span className={"icon-bar"} />
</button>
</div>
<div id={"navbar"} className={'navContainer'}>
{MapNav({onInfoClick:this.onInfoClick, onUserIconClick:this.onUserIconClick})}
{this.state.currentPopup ? this.state.currentPopup : null}
</div>
</div>
</nav>
)
}
}
// Render it
ReactDOM.render(
<MapHeader />,
document.getElementById("react")
);
<div id="react"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/latest/css/bootstrap.min.css" />
最佳答案
我已经解决了。我的代码中有 currentPopup 状态,它存储当前显示的弹出窗口,要查看更改,我必须在 isLogggedIn 状态更改后再次卸载并安装组件,因此我更改了显示当前弹出窗口的方式。我只存储简单的字符串值,而不是将整个组件存储在状态中,这些值提供有关当前组件的信息。无论如何,感谢您的提示,我一定会将它们应用到我的代码中。
const MapNav = (props) => {
return <div className={'mapNavContainer'}>
<ul className={'navList'}>
<li><a href="#about"><i className={"glyphicon glyphicon-fullscreen"} /></a></li>
<li><a href="#about"><i className={"glyphicon glyphicon-chevron-left"} /></a></li>
<li><a href="#about"><i className={"glyphicon glyphicon-chevron-right"} /></a></li>
<li><a href="#about"><i className={"glyphicon glyphicon-map-marker"} /></a></li>
<li><a href="#" onClick={props.onUserIconClick}><i className={"glyphicon glyphicon-user"} /></a></li>
<li><a href="#" onClick={props.onInfoClick}><i className={"glyphicon glyphicon-info-sign"} /></a></li>
</ul>
</div>
}
const UserPopup = (props) => {
return <div>
{(props.isLoggedIn) ? (
<div className={'navPopups col-sm-3 panel panel-default'}>
<div className={"panel-heading"}>Zalogowany</div>
<div className={"panel-body"}>
<button type='submit' onClick={props.logIn}>wyloguj</button>
</div>
</div>
) : (
<div className={'navPopups col-sm-3 panel panel-default'}>
<div className={"panel-heading"}>Niezalogowany</div>
<div className={"panel-body"}>
<button type='submit' onClick={props.logIn}>Zaloguj</button>
</div>
</div>
)
}
</div>;
};
function Welcome(props) {
return <div className={'navPopups col-sm-3 panel panel-default'}>
<div className={"panel-heading"}>Informacje o Autorze.</div>
<div className={"panel-body"}>
Basic panel example
</div>
</div>;
}
class MapHeader extends React.Component {
constructor(props) {
super(props);
this.state = {
currentPopup: null,
isLoggedIn: null,
};
this.onInfoClick = this.onInfoClick.bind(this);
this.onUserIconClick = this.onUserIconClick.bind(this);
this.logIn = this.logIn.bind(this);
}
onInfoClick = (e) => {
e.preventDefault();
this.setState({ currentPopup: this.state.currentPopup === 'info' ? null : 'info' });
}
onUserIconClick = (e) => {
e.preventDefault();
this.setState({ currentPopup: this.state.currentPopup === 'user_login' ? null : 'user_login' });
}
setPopup = (obj) => {
this.setState({ currentPopup: this.state.currentPopup === 'user_login' ? null : 'user_login' });
}
logIn = (e) => {
this.setState({ isLoggedIn: !this.state.isLoggedIn });
}
render() {
return (
<nav className={'header'}>
<div className={'container-fluid'}>
<div className={"navbar-header"}>
<button type="button" className={"navbar-toggle collapsed"} data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span className={"sr-only"}>Toggle navigation</span>
<span className={"icon-bar"} />
<span className={"icon-bar"} />
<span className={"icon-bar"} />
</button>
</div>
<div id={"navbar"} className={'navContainer'}>
{MapNav({onInfoClick:this.onInfoClick, onUserIconClick:this.onUserIconClick})}
{this.state.currentPopup === 'info' ? <Welcome /> : null}
{this.state.currentPopup === 'user_login' ? (
<UserPopup isLoggedIn={this.state.isLoggedIn} logIn={this.logIn} />
) : null}
</div>
</div>
</nav>
)
}
}
// Render it
ReactDOM.render(
<MapHeader />,
document.getElementById("react")
);
<div id="react"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/latest/css/bootstrap.min.css" />
关于javascript - prop 更改时重新渲染功能组件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42175389/