我有一个带有select表单元素的子组件,这会查询我的API并从数据中选择一个框。然后我尝试将通过OnChange函数选择的选项传递回我的父组件,以便我可以将数据发送回服务器。我一直收到一个错误,说状态没有定义,我是新手做出反应,不知道我哪里出错了。
这是我的父组件
var ReactDom = require('react-dom');
const uuid = require('uuid/v1');
import {postDataTest} from "../actions/postData";
import TeamSelectBox from "./TeamSelectBox";
import React, {Component, PropTypes} from "react";
class PlayerForm extends Component {
constructor(props) {
super(props);
this.state = {
teamId: ''
};
this.handleChange = this.handleChange.bind(this);
}
fieldValues = {
name: null,
teamName: null,
bio: null
}
handleChange(dataFromChild) {
console.log(dataFromChild);
}
nextStep(e) {
e.preventDefault();
// Get values via this.refs
var player = {
id: uuid(),
name: ReactDom.findDOMNode(this.refs.name).value,
teamName: ReactDom.findDOMNode(this.refs.teamName).value,
bio: ReactDom.findDOMNode(this.refs.bio).value,
teamId: ReactDom.findDOMNode(this.refs.teamId).value
};
postDataTest(player);
}
render() {
return (
<div className="row">
<div className="col-md-6">
<div className="panel">
<div className="panel-heading">
<h1>Add Player</h1>
</div>
<div className="panel-body">
<form className="form-horizontal">
<div className="form-group">
<label className="control-label">Name</label>
<input type="text" className="form-control" ref="name" defaultValue={this.fieldValues.name}/>
</div>
<div className="form-group">
<label className="control-label">Team Name</label>
<input type="text" className="form-control" ref="teamName" defaultValue={this.fieldValues.teamName}/>
</div>
<TeamSelectBox state={this.state.teamId} onChange={this.handleChange}/>
<div className="form-group">
<label className="control-label">Bio</label>
<input type="textarea" className="form-control" ref="bio" defaultValue={this.fieldValues.bio}/>
</div>
<div className="bs-component">
<button className="btn btn-md btn-default btn-block" onClick={this.nextStep}>Save & Continue</button>
</div>
</form>
</div>
</div>
</div>
</div>
)
}
}
module.exports = PlayerForm;
这是我的孩子表格选择框
import React, {Component} from "react";
import axios from "axios";
import {postDataTest} from '../actions/postData';
class TeamSelectBox extends Component {
constructor(props) {
super(props);
this.state = {
teams: []
};
}
componentDidMount() {
axios.get("/api/teams")
.then(response => {
const teams = response.data;
this.setState({teams});
console.log(teams);
});
}
render() {
return (
<div className="form-group">
<label for="inputSelect" className="control-label">Select Team</label>
<div className="bs-component">
<select value={this.probs.state.teamId} onChange={this.probs.onChange} className="form-control">
<option value=""></option>
{this.state.teams.map(singleTeam =>
<option value={singleTeam.id}>{singleTeam.team.name}</option>
)}
</select>
</div>
</div>
);
}
}
export default TeamSelectBox;
答案 0 :(得分:1)
我认为你有拼写错误,你错过了法术道具,this.props
而不是this.probs
答案 1 :(得分:1)
你的方法似乎没问题,但是你的孩子组件中有一个拼写错误:
{this.probs.onChange}
将其更改为{this.props.onChange}
然后重试!