Javascript 从子组件值到父组件显示
我有两个组件子组件和父组件,这个子组件的角色是星级评级,现在我想从子组件中获取要显示在父组件中的值,并使用来自子组件的数据 添加:我使用Redux和react navigation 2.0 子组件Javascript 从子组件值到父组件显示,javascript,reactjs,react-native,Javascript,Reactjs,React Native,我有两个组件子组件和父组件,这个子组件的角色是星级评级,现在我想从子组件中获取要显示在父组件中的值,并使用来自子组件的数据 添加:我使用Redux和react navigation 2.0 子组件 import React, { Component } from 'react'; //import react in our code. import { StyleSheet, View, Platform, Text, Image, TouchableOpacity,
import React, { Component } from 'react';
//import react in our code.
import {
StyleSheet,
View,
Platform,
Text,
Image,
TouchableOpacity,
} from 'react-native';
class Rate extends Component {
constructor() {
super();
this.state = {
Default_Rating: 0,
//To set the default Star Selected
Max_Rating: 5,
//To set the max number of Stars
};
//Filled Star. You can also give the path from local
this.Star = '../../assets/star_filled.png';
//Empty Star. You can also give the path from local
this.Star_With_Border = '../../assets/star_corner.png';
}
UpdateRating(key) {
this.setState({ Default_Rating: key });
//Keeping the Rating Selected in state
this.props.onStarRating(this.state.Default_Rating)
}
render() {
let React_Native_Rating_Bar = [];
//Array to hold the filled or empty Stars
for (var i = 1; i <= this.state.Max_Rating; i++) {
React_Native_Rating_Bar.push(
<TouchableOpacity
activeOpacity={0.7}
key={i}
onPress={this.UpdateRating.bind(this, i)}>
<Image
style={styles.StarImage}
source={
i <= this.state.Default_Rating
?
require('../../assets/star_filled.png')
: require('../../assets/star_corner.png')
}
/>
</TouchableOpacity>
);
}
return (
<View style={styles.MainContainer}>
{/*View to hold our Stars*/}
<View style={styles.childView}>{React_Native_Rating_Bar}</View>
<Text style={styles.textStyle}>
{/*To show the rating selected*/}
{this.state.Default_Rating} / {this.state.Max_Rating}
</Text>
</View>
);
}
}
export default Rate;
import React, { Component } from 'react';
import { connect } from 'react-redux';
import { Container} from 'native-base';
import Rate from '../components/Rate'
class Leads extends Component {
constructor(props) {
super(props);
this.state = {
}
}
//RENDER MAIN COMPONENT
render() {
return (
/* MAIN VIEW COMPONENT */
<Container>
<Rate />
</Container>
)
}
}
const mapStateToProps = (state) => ({
})
export default connect(mapStateToProps)(Leads);
import React,{Component}来自'React';
//在我们的代码中导入react。
进口{
样式表,
看法
平台,
文本,
形象,,
可触摸不透明度,
}从“反应本机”;
类速率扩展组件{
构造函数(){
超级();
此.state={
默认_评级:0,
//将默认星形设置为选中
最高评级:5,
//设置最大星星数的步骤
};
//填充星。您也可以从本地
this.Star='../assets/Star_filled.png';
//空星。您也可以从本地指定路径
this.Star_With_Border='../assets/Star_corner.png';
}
更新(键){
this.setState({Default_Rating:key});
//在状态中保持选定的分级
this.props.onStarRating(this.state.Default_Rating)
}
render(){
让我们作出反应(本地评级栏=[];
//阵列以容纳填充的或空的星星
对于(var i=1;i要从子组件到父组件获取数据,您可以将一个函数从父组件传递到子组件。然后,一旦从子组件调用该函数,您就可以更新父组件中的数据
家长:
handleChange = data =>{
this.setState({ data: data })
}
render(){
return(
<Child
handleChange={this.handleChange}
>
)
}
this.props.handleChange("your data")