一、简述
父组件嵌套子组件，父组件的处理函数通过属性的方式赋值组子组件（
<GenderSelect handleSelect={this.handleSelect}></GenderSelect>
），子组件通过触发事件，委托调用父组件的处理函数，从而实现把值传给父组件（return <select onChange={this.props.handleSelect}>，
handleSelect: function(event) {
this.setState({gender: event.target.value})
}
）
二、代码
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title>父子关系</title>
</head>
<body>
<script src="./react-0.13.2/react-0.13.2/build/react.js"></script>
<script src="./react-0.13.2/react-0.13.2/build/JSXTransformer.js"></script>
<script type="text/jsx">
var GenderSelect = React.createClass({
render: function() {
return <select onChange={this.props.handleSelect}>
<option value="0">男</option>
<option value="1">女</option>
</select>
}
})
var SignupForm = React.createClass({
getInitialState: function() {
return {
name: '',
password: '',
gender: '',
}
},
handleChange: function(name, event) {
var newState = {}
newState[name] = event.target.value
this.setState(newState)
},
handleSelect: function(event) {
this.setState({gender: event.target.value})
},
render: function() {
console.log(this.state)
return <form>
<input type="text" placeholder="请输入用户名" onChange={this.handleChange.bind(this, 'name')} />
<input type="password" placeholder="请输入密码" onChange={this.handleChange.bind(this, 'password')} />
<GenderSelect handleSelect={this.handleSelect}></GenderSelect>
</form>
}
})
React.render(<SignupForm></SignupForm>, document.body);
</script>
</body>
</html>