相邻的JSX元素必须包装在一个封闭标签中，缺少父标签

Question

  

我正在尝试将 action buttons 添加到我的 shedule 应用

源代码

import React, { Component } from 'react';
import {
  Text,
  View,
  StyleSheet
} from 'react-native';
import {Agenda} from 'react-native-calendars';

import ActionButton from 'react-native-action-button';
import Icon from 'react-native-vector-icons/Ionicons';

export default class AgendaScreen extends Component {
  constructor(props) {
    super(props);
    this.state = {
      items: {}
    };
  }

  render() {
    return (
      <Agenda
        items={this.state.items}
        loadItemsForMonth={this.loadItems.bind(this)}
        selected={'2017-05-16'}
        renderItem={this.renderItem.bind(this)}
        renderEmptyDate={this.renderEmptyDate.bind(this)}
        rowHasChanged={this.rowHasChanged.bind(this)}

      />
      <View style={{flex:1, backgroundColor: '#f3f3f3'}}>
        {/* Rest of the app comes ABOVE the action button component !*/}
        <ActionButton buttonColor="rgba(231,76,60,1)">
          <ActionButton.Item buttonColor='#9b59b6' title="Create Shedule" onPress={() => console.log("Create Shedule!")}>
            <Icon name="md-create" style={styles.actionButtonIcon} />
          </ActionButton.Item>
          <ActionButton.Item buttonColor='#3498db' title="Notifications" onPress={() => {}}>
            <Icon name="md-notifications-off" style={styles.actionButtonIcon} />
          </ActionButton.Item>
          <ActionButton.Item buttonColor='#1abc9c' title="All Tasks" onPress={() => {}}>
            <Icon name="md-done-all" style={styles.actionButtonIcon} />
          </ActionButton.Item>
        </ActionButton>
      </View>
    );
  this.confirmDate = this.confirmDate.bind(this);
  this.openCalendar = this.openCalendar.bind(this);
  }

  loadItems(day) {
    setTimeout(() => {
      for (let i = -15; i < 85; i++) {
        const time = day.timestamp + i * 24 * 60 * 60 * 1000;
        const strTime = this.timeToString(time);
        if (!this.state.items[strTime]) {
          this.state.items[strTime] = [];
          const numItems = Math.floor(Math.random() * 5);
          for (let j = 0; j < numItems; j++) {
            this.state.items[strTime].push({
              name: 'Item for ' + strTime,
              height: Math.max(50, Math.floor(Math.random() * 150))
            });
          }
        }
      }
      //console.log(this.state.items);
      const newItems = {};
      Object.keys(this.state.items).forEach(key => {newItems[key] = this.state.items[key];});
      this.setState({
        items: newItems
      });
    }, 1000);
    // console.log(`Load Items for ${day.year}-${day.month}`);
  }

  renderItem(item) {
    return (
      <View style={[styles.item, {height: item.height}]}><Text>{item.name}</Text></View>
    );
  }

  renderEmptyDate() {
    return (
      <View style={styles.emptyDate}><Text>This is empty date!</Text></View>
    );
  }

  rowHasChanged(r1, r2) {
    return r1.name !== r2.name;
  }

  timeToString(time) {
    const date = new Date(time);
    return date.toISOString().split('T')[0];
  }
}

const styles = StyleSheet.create({
  item: {
    backgroundColor: 'white',
    flex: 1,
    borderRadius: 5,
    padding: 10,
    marginRight: 10,
    marginTop: 17
  },
  emptyDate: {
    height: 15,
    flex:1,
    paddingTop: 30
  }
}

actionButtonIcon: {
    fontSize: 20,
    height: 22,
    color: 'white',
  },);

  

这是我的操作按钮源代码（也包含在上面   代码）

import React, { Component } from 'react';

import ActionButton from 'react-native-action-button';
import Icon from 'react-native-vector-icons/Ionicons';
import { StyleSheet, Text, View } from 'react-native';





export default function App() {
  return (
   <View style={{flex:1, backgroundColor: '#f3f3f3'}}>
        {/* Rest of the app comes ABOVE the action button component !*/}
        <ActionButton buttonColor="rgba(231,76,60,1)">
          <ActionButton.Item buttonColor='#9b59b6' title="Create Shedule" onPress={() => console.log("Create Shedule!")}>
            <Icon name="md-create" style={styles.actionButtonIcon} />
          </ActionButton.Item>
          <ActionButton.Item buttonColor='#3498db' title="Notifications" onPress={() => {}}>
            <Icon name="md-notifications-off" style={styles.actionButtonIcon} />
          </ActionButton.Item>
          <ActionButton.Item buttonColor='#1abc9c' title="All Tasks" onPress={() => {}}>
            <Icon name="md-done-all" style={styles.actionButtonIcon} />
          </ActionButton.Item>
        </ActionButton>
      </View>
    );
  }



const styles = StyleSheet.create({
  actionButtonIcon: {
    fontSize: 20,
    height: 22,
    color: 'white',
  },
});

  

这是我遇到的错误   

     

这就是它的外观   

从here中可以获取日历，这就是action button 我尝试添加操作按钮，但始终收到上述错误 如果您能明确指出标签丢失的位置以及如何纠正标签，这将非常有帮助 谢谢

＃

Answer 1

您的Agenda组件和View标签是相邻的，正如您所知道的，在react中，我们只能在父标签上使用，而没有相邻的标签。只需将它们包装在另一个这样的视图标签中-

render() {
    return (
    <View>
      <Agenda
        items={this.state.items}
        loadItemsForMonth={this.loadItems.bind(this)}
        selected={'2017-05-16'}
        renderItem={this.renderItem.bind(this)}
        renderEmptyDate={this.renderEmptyDate.bind(this)}
        rowHasChanged={this.rowHasChanged.bind(this)}

      />
      <View style={{flex:1, backgroundColor: '#f3f3f3'}}>
        {/* Rest of the app comes ABOVE the action button component !*/}
        <ActionButton buttonColor="rgba(231,76,60,1)">
          <ActionButton.Item buttonColor='#9b59b6' title="Create Shedule" onPress={() => console.log("Create Shedule!")}>
            <Icon name="md-create" style={styles.actionButtonIcon} />
          </ActionButton.Item>
          <ActionButton.Item buttonColor='#3498db' title="Notifications" onPress={() => {}}>
            <Icon name="md-notifications-off" style={styles.actionButtonIcon} />
          </ActionButton.Item>
          <ActionButton.Item buttonColor='#1abc9c' title="All Tasks" onPress={() => {}}>
            <Icon name="md-done-all" style={styles.actionButtonIcon} />
          </ActionButton.Item>
        </ActionButton>
      </View>
     </View>
    );

Answer 2

省略道具和孩子，您会得到：

  return (
    <Agenda />
    <View />
  );

返回这样的两个组件是不合法的。您只需要在根目录有一个jsx标记即可。 React提供了一个special jsx tag called a "fragment"，他的唯一工作就是包装多个组件。它不会在屏幕上产生任何输出：

  return (
    <React.Fragment>
      <Agenda />
      <View />
    </React.Fragment>
  );

还有一个片段的快捷方式，只要不需要将密钥传递给片段，就可以使用该快捷方式：

  return (
    <>
      <Agenda />
      <View />
    </>
  );

Answer 3

在App.js中。有两个同级/相邻组件Agenda和View组件。这些应具有单个父组件。即render()函数应具有单个要呈现的组件。因此，将Agenda和View包装在一个组件中。

import {
  Text,
  View,
  StyleSheet
} from 'react-native';
import {Agenda} from 'react-native-calendars';

import ActionButton from 'react-native-action-button';
import Icon from 'react-native-vector-icons/Ionicons';

export default class AgendaScreen extends Component {
  constructor(props) {
    super(props);
    this.state = {
      items: {}
    };
  }

  render() {
    return (
     <>
      <Agenda
        items={this.state.items}
        loadItemsForMonth={this.loadItems.bind(this)}
        selected={'2017-05-16'}
        renderItem={this.renderItem.bind(this)}
        renderEmptyDate={this.renderEmptyDate.bind(this)}
        rowHasChanged={this.rowHasChanged.bind(this)}

      />
      <View style={{flex:1, backgroundColor: '#f3f3f3'}}>
        {/* Rest of the app comes ABOVE the action button component !*/}
        <ActionButton buttonColor="rgba(231,76,60,1)">
          <ActionButton.Item buttonColor='#9b59b6' title="Create Shedule" onPress={() => console.log("Create Shedule!")}>
            <Icon name="md-create" style={styles.actionButtonIcon} />
          </ActionButton.Item>
          <ActionButton.Item buttonColor='#3498db' title="Notifications" onPress={() => {}}>
            <Icon name="md-notifications-off" style={styles.actionButtonIcon} />
          </ActionButton.Item>
          <ActionButton.Item buttonColor='#1abc9c' title="All Tasks" onPress={() => {}}>
            <Icon name="md-done-all" style={styles.actionButtonIcon} />
          </ActionButton.Item>
        </ActionButton>
      </View>
    </>
    );
  this.confirmDate = this.confirmDate.bind(this);
  this.openCalendar = this.openCalendar.bind(this);
  }

  loadItems(day) {
    setTimeout(() => {
      for (let i = -15; i < 85; i++) {
        const time = day.timestamp + i * 24 * 60 * 60 * 1000;
        const strTime = this.timeToString(time);
        if (!this.state.items[strTime]) {
          this.state.items[strTime] = [];
          const numItems = Math.floor(Math.random() * 5);
          for (let j = 0; j < numItems; j++) {
            this.state.items[strTime].push({
              name: 'Item for ' + strTime,
              height: Math.max(50, Math.floor(Math.random() * 150))
            });
          }
        }
      }
      //console.log(this.state.items);
      const newItems = {};
      Object.keys(this.state.items).forEach(key => {newItems[key] = this.state.items[key];});
      this.setState({
        items: newItems
      });
    }, 1000);
    // console.log(`Load Items for ${day.year}-${day.month}`);
  }

  renderItem(item) {
    return (
      <View style={[styles.item, {height: item.height}]}><Text>{item.name}</Text></View>
    );
  }

  renderEmptyDate() {
    return (
      <View style={styles.emptyDate}><Text>This is empty date!</Text></View>
    );
  }

  rowHasChanged(r1, r2) {
    return r1.name !== r2.name;
  }

  timeToString(time) {
    const date = new Date(time);
    return date.toISOString().split('T')[0];
  }
}

const styles = StyleSheet.create({
  item: {
    backgroundColor: 'white',
    flex: 1,
    borderRadius: 5,
    padding: 10,
    marginRight: 10,
    marginTop: 17
  },
  emptyDate: {
    height: 15,
    flex:1,
    paddingTop: 30
  }
}

actionButtonIcon: {
    fontSize: 20,
    height: 22,
    color: 'white',
  },);

Answer 4

始终将多个组件或标签包装在父/包装器中

喜欢-

return(
<View>
 <Component1 />
 <Component2 />
</View>
)

不是这样

return(
<Component1 />
<Component2 />
)

在您的代码中

由父View标签包裹

return (
     <View>
      <Agenda
        items={this.state.items}
        loadItemsForMonth={this.loadItems.bind(this)}
        selected={'2017-05-16'}
        renderItem={this.renderItem.bind(this)}
        renderEmptyDate={this.renderEmptyDate.bind(this)}
        rowHasChanged={this.rowHasChanged.bind(this)}

      />
      <View style={{flex:1, backgroundColor: '#f3f3f3'}}>
        {/* Rest of the app comes ABOVE the action button component !*/}
        <ActionButton buttonColor="rgba(231,76,60,1)">
          <ActionButton.Item buttonColor='#9b59b6' title="Create Shedule" onPress={() => console.log("Create Shedule!")}>
            <Icon name="md-create" style={styles.actionButtonIcon} />
          </ActionButton.Item>
          <ActionButton.Item buttonColor='#3498db' title="Notifications" onPress={() => {}}>
            <Icon name="md-notifications-off" style={styles.actionButtonIcon} />
          </ActionButton.Item>
          <ActionButton.Item buttonColor='#1abc9c' title="All Tasks" onPress={() => {}}>
            <Icon name="md-done-all" style={styles.actionButtonIcon} />
          </ActionButton.Item>
        </ActionButton>
      </View>
     </View>
    );