import React, {Component} from 'react';
class ReactForm extends Component {
constructor(props) {
super(props);
this.state = {
msg:'React表单',
name:'',
gender:'1',
city:'北京',
citys:[
'北京','上海','深圳'
],
hobby:[
{
title:"sleep",
checked:true,
},
{
title:'eat',
checked:false,
},
{
title:'coding',
checked:true,
}
],
info:'',
};
}
handelSubmit=(e)=>{
e.preventDefault(); //阻止submit的提交事件
// alert("您已提交");
console.log(this.state.name,this.state.gender,this.state.city,this.state.hobby,this.state.info);
}
handelName=(e)=>{
this.setState({
name:e.target.value,
})
}
handelGender=(e)=>{
this.setState({
gender:e.target.value
})
}
handelCity=(e)=>{
this.setState({
city:e.target.value
})
}
handelHobby=(key)=>{
var hobby=this.state.hobby;
hobby[key].checked=!hobby[key].checked;
this.setState({
hobby:hobby
})
}
handelInfo=(e)=>{
this.setState({
info:e.target.value
})
}
render() {
return (
<div>
<h2>{this.state.msg}</h2>
<form onSubmit={this.handelSubmit}>
{/* {this.state.name} */}
用户名：<input type='text' value={this.state.name} onChange={this.handelName} /><br /><br />
{/* checked的作用是选默认 */}
性别：<input type='radio' value='1' checked={this.state.gender==='1'} onChange={this.handelGender} />男
<input type='radio' value='2' checked={this.state.gender==='2'} onChange={this.handelGender} />女<br /><br />
居住城市：<select value={this.state.city} onChange={this.handelCity}>
{
this.state.citys.map(function(value,key){
return <option key={key}>{value}</option>
})
}
</select><br /><br />
爱好：{
// 注意this指向
this.state.hobby.map((value,key)=>{
return (
<span key={key}>
{/* 重点复习，稍微有点难理解 */}
<input type='checkbox' checked={value.checked} onChange={this.handelHobby.bind(this,key)} />
{value.title}
</span>
)
})
}
<br /><br />
备注：<textarea value={this.state.info} onChange={this.handelInfo} />
<br /><br />
<input type='submit' defaultValue='提交' />
</form>
</div>
);
}
}
export default ReactForm;