我有他的代码,我尝试将变量传递给handleclick fcn并将状态设置为该变量:
class MyComponent extends React.Component {
constructor(props) {
super(props);
this.state = {
name: 'Initial State'
};
this.handleClick = this.handleClick.bind(this);
}
handleClick(temp) {
this.setState({
name:temp
});
}
render() {
return (
<div>
<button onClick={this.handleClick('name')}>Click Me</button>
<h1>{this.state.name}</h1>
</div>
);
}
};
这是行不通的,如果可以的话,有人可以解释如何传递变量并将状态设置为它吗?
答案 0 :(得分:2)
通过编写this.handleClick('name')
,您可以直接在渲染上调用handleClick
函数。您想给onClick
道具提供一个功能,该功能将在点击时调用。
示例
class MyComponent extends React.Component {
constructor(props) {
super(props);
this.state = {
name: "Initial State"
};
this.handleClick = this.handleClick.bind(this);
}
handleClick(temp) {
this.setState({
name: temp
});
}
render() {
return (
<div>
<button onClick={() => this.handleClick("name")}>Click Me</button>
<h1>{this.state.name}</h1>
</div>
);
}
}
ReactDOM.render(<MyComponent />, document.getElementById("root"));
<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>
<div id="root"></div>