Javascript 如何解决stackNavigator的问题
在这段代码中,我在ListView上填充json数据。单击项值后,在新屏幕上传递该特定值。 我已经创建了MainActivity,在其中填充JSON值,并在第二个Activity上发送所选项目值, 在我使用的类之间导航Javascript 如何解决stackNavigator的问题,javascript,reactjs,react-native,react-redux,Javascript,Reactjs,React Native,React Redux,在这段代码中,我在ListView上填充json数据。单击项值后,在新屏幕上传递该特定值。 我已经创建了MainActivity,在其中填充JSON值,并在第二个Activity上发送所选项目值, 在我使用的类之间导航 export default MyNewProject = StackNavigator( { First: { screen: MainActivity }, Second: { screen: SecondActivity } }); //获取错误“undefin
export default MyNewProject = StackNavigator(
{
First: { screen: MainActivity },
Second: { screen: SecondActivity }
});
//获取错误“undefined不是一个函数(正在评估“(0_reactnavigation.stacknavigator)”
import React,{Component}来自'React';
从“react native”导入{样式表、文本、视图、列表视图、ActivityIndicator};
从“react navigation”导入{StackNavigator};
类MainActivity扩展组件{
建造师(道具){
超级(道具);
此.state={
//此状态的默认值。
正在加载活动指示器:true
}
}
componentDidMount(){
返回获取('https://reactnativecode.000webhostapp.com/FruitsList.php')
.then((response)=>response.json())
.然后((responseJson)=>{
让ds=newListView.DataSource({rowHasChanged:(r1,r2)=>r1!==r2});
这是我的国家({
加载活动指示器:false,
数据源:ds.cloneWithRows(responseJson),
},函数(){
//在这个模块中,您可以对新状态执行某些操作。
});
})
.catch((errorMsg)=>{
控制台错误(errorMsg);
});
}
ListViewItemSeparator=()=>{
返回(
);
}
导航到第二个活动=(水果名称)=>
{
//在下一个活动中发送JSON ListView选定项值。
this.props.navigation.navigate('Second',{JSON\u ListView\u Clicked\u Item:fruit\u name});
}
静态导航选项=
{
标题:“主要活动”,
};
render()
{
if(此.state.Loading\u活动\u指示器){
返回(
);
}
返回(
{rowData.fruit_name}
/>
);
}
}
类SecondActivity扩展组件
{
静态导航选项=
{
标题:“第二项活动”,
};
render()
{
返回(
{this.props.navigation.state.params.JSON_ListView_Clicked_Item}
);
}
}
导出默认MyNewProject=StackNavigator(
{
第一:{screen:MainActivity},
第二个:{屏幕:第二个活动}
});
const styles=StyleSheet.create(
{
主容器:
{
为内容辩护:“中心”,
弹性:1,
差额:10
},
文本样式:
{
尺寸:23,
textAlign:'中心',
颜色:“#000”,
},
rowViewContainer:
{
尺寸:17,
paddingRight:10,
paddingTop:10,
填充底部:10,
},
活动指示器样式:
{
弹性:1,
对齐项目:“居中”,
为内容辩护:“中心”,
左:0,,
右:0,,
排名:0,
底部:0,
}
});
//我试过了,但没有找到解决办法。。我被困住了,这可能是一件小事,但没有得到解决方案。。
我需要帮助。。
谢谢stackNavigator已被弃用,您应该改用createStackNavigator 更多信息,请访问: 编辑:
stackNavigator不推荐使用,您应该改用createStackNavigator 更多信息,请访问: 编辑:
把你的代码改成这个
import { createStackNavigator } from 'react-navigation';
export default MyNewProject = createStackNavigator(
{
First: { screen: MainActivity },
Second: { screen: SecondActivity }
});
把你的代码改成这个
import { createStackNavigator } from 'react-navigation';
export default MyNewProject = createStackNavigator(
{
First: { screen: MainActivity },
Second: { screen: SecondActivity }
});
试试这个代码
import React, { Component } from 'react';
import { StyleSheet, Text, View, ListView, ActivityIndicator } from 'react-native';
import { createStackNavigator } from 'react-navigation'
class MainActivity extends Component {
constructor(props) {
super(props);
this.state = {
// Default Value of this State.
Loading_Activity_Indicator: true
}
}
componentDidMount() {
return fetch('https://reactnativecode.000webhostapp.com/FruitsList.php')
.then((response) => response.json())
.then((responseJson) => {
let ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
this.setState({
Loading_Activity_Indicator: false,
dataSource: ds.cloneWithRows(responseJson),
}, function() {
// In this block you can do something with new state.
});
})
.catch((errorMsg) => {
console.error(errorMsg);
});
}
ListViewItemSeparator = () => {
return (
<View
style={{
height: .5,
width: "100%",
backgroundColor: "#000",
}}
/>
);
}
Navigate_To_Second_Activity=(fruit_name)=>
{
//Sending the JSON ListView Selected Item Value On Next Activity.
this.props.navigation.navigate('Second', { JSON_ListView_Clicked_Item: fruit_name });
}
static navigationOptions =
{
title: 'MainActivity',
};
render()
{
if (this.state.Loading_Activity_Indicator) {
return (
<View style={styles.ActivityIndicator_Style}>
<ActivityIndicator size = "large" color="#009688"/>
</View>
);
}
return (
<View style={styles.MainContainer}>
<ListView
dataSource={this.state.dataSource}
renderSeparator= {this.ListViewItemSeparator}
renderRow={(rowData) => <Text style={styles.rowViewContainer}
onPress={this.Navigate_To_Second_Activity.bind(this, rowData.fruit_name)} >{rowData.fruit_name}</Text>}
/>
</View>
);
}
}
class SecondActivity extends Component
{
static navigationOptions =
{
title: 'SecondActivity',
};
render()
{
return(
<View style = { styles.MainContainer }>
<Text style = { styles.TextStyle }> { this.props.navigation.state.params.JSON_ListView_Clicked_Item } </Text>
</View>
);
}
}
export default MyNewProject = createStackNavigator (
{
First: { screen: MainActivity },
Second: { screen: SecondActivity }
});
const styles = StyleSheet.create(
{
MainContainer:
{
justifyContent: 'center',
flex:1,
margin: 10
},
TextStyle:
{
fontSize: 23,
textAlign: 'center',
color: '#000',
},
rowViewContainer:
{
fontSize: 17,
paddingRight: 10,
paddingTop: 10,
paddingBottom: 10,
},
ActivityIndicator_Style:
{
flex: 1,
alignItems: 'center',
justifyContent: 'center',
left: 0,
right: 0,
top: 0,
bottom: 0,
}
});
import React,{Component}来自'React';
从“react native”导入{样式表、文本、视图、列表视图、ActivityIndicator};
从“反应导航”导入{createStackNavigator}
类MainActivity扩展组件{
建造师(道具){
超级(道具);
此.state={
//此状态的默认值。
正在加载活动指示器:true
}
}
componentDidMount(){
返回获取('https://reactnativecode.000webhostapp.com/FruitsList.php')
.then((response)=>response.json())
.然后((responseJson)=>{
让ds=newListView.DataSource({rowHasChanged:(r1,r2)=>r1!==r2});
这是我的国家({
加载活动指示器:false,
数据源:ds.cloneWithRows(responseJson),
},函数(){
//在这个模块中,您可以对新状态执行某些操作。
});
})
.catch((errorMsg)=>{
控制台错误(errorMsg);
});
}
ListViewItemSeparator=()=>{
返回(
);
}
导航到第二个活动=(水果名称)=>
{
//在下一个活动中发送JSON ListView选定项值。
this.props.navigation.navigate('Second',{JSON\u ListView\u Clicked\u Item:fruit\u name});
}
静态导航选项=
{
标题:“主要活动”,
};
render()
{
if(此.state.Loading\u活动\u指示器){
返回(
);
}
返回(
{rowData.fruit_name}
/>
);
}
}
类SecondActivity扩展组件
{
静态导航选项=
{
标题:“第二项活动”,
};
render()
{
返回(
import React, { Component } from 'react';
import { StyleSheet, Text, View, ListView, ActivityIndicator } from 'react-native';
import { createStackNavigator } from 'react-navigation'
class MainActivity extends Component {
constructor(props) {
super(props);
this.state = {
// Default Value of this State.
Loading_Activity_Indicator: true
}
}
componentDidMount() {
return fetch('https://reactnativecode.000webhostapp.com/FruitsList.php')
.then((response) => response.json())
.then((responseJson) => {
let ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
this.setState({
Loading_Activity_Indicator: false,
dataSource: ds.cloneWithRows(responseJson),
}, function() {
// In this block you can do something with new state.
});
})
.catch((errorMsg) => {
console.error(errorMsg);
});
}
ListViewItemSeparator = () => {
return (
<View
style={{
height: .5,
width: "100%",
backgroundColor: "#000",
}}
/>
);
}
Navigate_To_Second_Activity=(fruit_name)=>
{
//Sending the JSON ListView Selected Item Value On Next Activity.
this.props.navigation.navigate('Second', { JSON_ListView_Clicked_Item: fruit_name });
}
static navigationOptions =
{
title: 'MainActivity',
};
render()
{
if (this.state.Loading_Activity_Indicator) {
return (
<View style={styles.ActivityIndicator_Style}>
<ActivityIndicator size = "large" color="#009688"/>
</View>
);
}
return (
<View style={styles.MainContainer}>
<ListView
dataSource={this.state.dataSource}
renderSeparator= {this.ListViewItemSeparator}
renderRow={(rowData) => <Text style={styles.rowViewContainer}
onPress={this.Navigate_To_Second_Activity.bind(this, rowData.fruit_name)} >{rowData.fruit_name}</Text>}
/>
</View>
);
}
}
class SecondActivity extends Component
{
static navigationOptions =
{
title: 'SecondActivity',
};
render()
{
return(
<View style = { styles.MainContainer }>
<Text style = { styles.TextStyle }> { this.props.navigation.state.params.JSON_ListView_Clicked_Item } </Text>
</View>
);
}
}
export default MyNewProject = createStackNavigator (
{
First: { screen: MainActivity },
Second: { screen: SecondActivity }
});
const styles = StyleSheet.create(
{
MainContainer:
{
justifyContent: 'center',
flex:1,
margin: 10
},
TextStyle:
{
fontSize: 23,
textAlign: 'center',
color: '#000',
},
rowViewContainer:
{
fontSize: 17,
paddingRight: 10,
paddingTop: 10,
paddingBottom: 10,
},
ActivityIndicator_Style:
{
flex: 1,
alignItems: 'center',
justifyContent: 'center',
left: 0,
right: 0,
top: 0,
bottom: 0,
}
});