this.setState()
所以我试图将react-modal集成到我的项目中。
未调用export const StartComponent = (props) => (
<div className="start-page">
<div className="container">
<div className="row">
<div className="col-sm-6">
<NavLink to="/start/klarungsfalle">Einträge prüfen</NavLink>
</div>
<div className="col-sm-6" >
<NavLink onClick={props.handleModalOpen} style={{ background: "#aac4d3", cursor: "default" }} to="/">Einträge verfügen</NavLink>
</div>
</div>
</div>
</div>
方法我没有看到控制台日志,当我将回调传递给setState()方法时也没有。
有人可以帮帮我吗?
你的时间!
更新 - 启动组件代码。
redux
);
另外,我必须提到我也在使用.flex {
display: flex;
}
.item {
width: 50%;
}
.square {
width: 100%;
background: red;
}
.square:after {
content: "";
display: block;
padding-bottom: 100%;
}
。
答案 0 :(得分:1)
问题似乎是在处理事件时es6需要一些缺少的绑定。因此,对于访问状态的处理程序,只需将这些绑定放在构造函数中:
constructor() {
super();
this.state = {
showModal: false
};
// bindings
this.handleOpenModal = this.handleOpenModal.bind(this);
this.handleCloseModal = this.handleCloseModal.bind(this);
}
那里不需要匿名函数:
handleOpenModal() {
this.setState({showModal: true});
}
handleCloseModal() {
this.setState({showModal: false});
}
答案 1 :(得分:1)
您的代码似乎对我有用。我只是设置<StartComponent />
,看起来状态正如你想要的那样。
尝试使用以下代码的代码段:
另外,您可以查看 CodePen Demo 。
const { HashRouter, NavLink } = ReactRouterDOM;
const App = () => (
<HashRouter>
<Modal />
</HashRouter>
);
const StartComponent = ({currentState, handleModalOpen, handleNix}) => (
<div className="start-page">
<div className="container">
<div className="row">
<div className="col-sm-6">
<NavLink to="/start/klarungsfalle" onClick={handleNix}>Einträge prüfen</NavLink>
</div>
<div className="col-sm-6">
<NavLink
onClick={handleModalOpen}
style={{ background: "#aac4d3", cursor: "default" }}
to="/"
>
Einträge verfügen
</NavLink>
</div>
</div>
<div className='row justify-center'>
<div className='col-xs-12'>
<div>
<code>Modal</code> state
<pre>{JSON.stringify(currentState)}</pre>
</div>
</div>
</div>
</div>
</div>
);
class Modal extends React.Component {
constructor(props) {
super(props);
this.state = {
showModal: false
};
}
handleOpenModal = () => {
console.log("Here");
this.setState(() => {
console.log(`Changing state to 'showModal: ${this.state.showModal}'`);
return { showModal: true };
});
};
handleNix = () => {
alert("hier gibt's nichts");
}
handleCloseModal = () => {
console.log(this.state.showModal);
this.setState(() => {
console.log(`Changing state to 'showModal: ${this.state.showModal}'`);
return { showModal: false };
});
};
render() {
console.log(this.state);
return (
<div className="container">
<StartComponent
handleModalOpen={this.handleOpenModal}
handleNix={this.handleNix}
currentState={this.state}/>
<ReactModal
isOpen={this.state.showModal}
contentLabel="Minimal Modal Example">
<div className="flex columns-center">
<div className="note">
The modal hides the Stack Overflow console. Look behind the modal
or open your JS console.
</div>
<div className="flex">
<div>
<code>Modal</code> state
<pre>{JSON.stringify(this.state)}</pre>
</div>
<button
className="btn btn-sm btn-danger"
onClick={this.handleCloseModal}>
Close Modal
</button>
</div>
</div>
</ReactModal>
</div>
);
}
}
ReactDOM.render(<App />, document.getElementById("app"));
&#13;
.flex {
display: flex;
}
.justify-center {
justify-content: center;
}
.space-around {
justify-content: space-around;
}
.columns-center {
flex-direction: column;
align-items: center;
}
.note {
font-size: 0.7em;
margin-bottom: 1rem;
}
.btn:after {
content: "\01F436";
}
&#13;
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet" />
<div id="app"></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>
<script src="https://unpkg.com/react-router-dom/umd/react-router-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-modal/2.3.2/react-modal.min.js"></script>
&#13;
答案 2 :(得分:0)
将回调传递给setState意味着当setState完成时,它将继续运行该函数; setState是异步的,但这不会对你有所帮助。为StartComponent组件提供代码可能会有所帮助,因为可能没有调用您的处理函数。
尝试onClick={() => props.handleModalOpen()}
注意:只是一个建议,考虑在子节点中为你的道具命名与父节点相同,因为handleModalOpen和handleOpenModal会让人感到困惑。
答案 3 :(得分:0)
你必须绑定功能才能使用&#39;这个&#39;关键字
mvn dependency:tree