富贵资源网

React-Native使用Mobx实现购物车功能
站长资源 2024/11/13 佚名
39 1538
富贵资源网 Design By www.hznty.com

在工作中，购物车场景非常常见。本文实现基于React-Native和Mobx实现两种购物车例子。

其中，后期会加入动画等其他。本期先实现基础功能。

二：基于State实现购物车

1-：ShoppingCarPage.js

export default class ShoppingCarPage extends Component {
  static navigationOptions = {
    headerTitle : '基于State购物车',
  };

  constructor(props) {
    super(props);
    this.state = {
      allSelecte : data.isAllSelect,
      totalMoney : data.totalMoney,
    }

  };

  getMoney = (m) => {
    this.state.totalMoney=this.state.totalMoney+m;
    //this.state.totalMoney += m;
    data.totalMoney = this.state.totalMoney;
    this.setState({
      totalMoney : this.state.totalMoney
    });

    let i = 0;
    data.datas.map((item) => {
      if (item.isSelect != true) {
        i += 1;
      }
    });
    if (i == 0) {
      data.isAllSelect = true;
      this.setState({ allSelecte : true })
    }
    else {
      data.isAllSelect = false;
      this.setState({ allSelecte : false })
    }
  };

  renderItem = (item) => {
    return (
      <ShoppingItemComponent
        itemData={item}
        money={this.getMoney}
      />
    )
  };

  allSelect = () => {
    data.totalMoney = 0;
    data.isAllSelect = !data.isAllSelect;
    this.state.totalMoney = 0;
    DeviceEventEmitter.emit('allSelect', !this.state.allSelecte);
    this.setState({ allSelecte : !this.state.allSelecte })
  };

  separatorView = () => {
    return (
      <View style={{ height : 10, backgroundColor : '#e9e9e9' }}/>
    )
  };

  keyExtractor = (item) => item.name;

  render() {
    let { allSelecte, totalMoney } = this.state;
    return (
      <View style={styles.container}>
        <FlatList data={data.datas}
             ItemSeparatorComponent={this.separatorView}
             renderItem={({ item }) => this.renderItem(item)}
             keyExtractor={ this.keyExtractor }
        />
        <View style={styles.tool}>
          <View style={{ flex : 1, flexDirection : 'row', alignItems : 'center' }}>
            <TouchableOpacity style={styles.select} onPress={ this.allSelect }>
              <Image source={allSelecte "htmlcode">



export default class ShoppingItemComponent extends Component {

  static propTypes = {
    itemData : PropTypes.object.isRequired,
    money : PropTypes.func,
  };

  static defaultProps = {
    money : () => null,
  };

  componentDidMount() {
    this.subscription = DeviceEventEmitter.addListener('allSelect', (isSelAll) => {
      this.props.itemData.isSelect = isSelAll;
      this.setState({ isSel : isSelAll });
      if (isSelAll) {
        this.setMoney(this.state.money * this.state.selNum);
      }

    })
  };

  componentWillUnmount() {
    this.subscription && this.subscription.remove();
  };

  constructor(props) {
    super(props);
    this.state = {
      isSel : this.props.itemData.isSelect,
      selNum : this.props.itemData.count,
      money : this.props.itemData.money,
      name : this.props.itemData.name,
      description : this.props.itemData.description,
      img : this.props.itemData.img,
    }
  };

  itemSelect = (item) => {
    this.setState({isSel :!this.state.isSel},()=>{
      if (this.state.isSel) {
        this.setMoney(this.state.money * this.state.selNum)
      }
      else {
        this.setMoney(-this.state.money * this.state.selNum)
      }
    });
  };

  itemIncrease = (i) => {
    i++;
    this.setState({selNum : i},()=>{
      if (this.state.isSel) {
        this.setMoney(this.state.money)
      }else{
        this.setState({isSel :true});
        this.setMoney(this.state.money * this.state.selNum);
      }
      this.props.itemData.count = i;
    });
  };

  itemReduce = (i) => {
    if (i <= 1) {
      if(this.state.isSel){
        this.setState({isSel :!this.state.isSel});
        this.setMoney(-this.state.money)
      }
      return;
    }
    i--;
    this.setState({ selNum : i },()=>{
      if (this.state.isSel) {
        this.setMoney(-this.state.money)
      }else{
        this.setState({isSel :true});
        this.setMoney(this.state.money * this.state.selNum);
      }
      this.props.itemData.count = i;
    });

  };

  setMoney = (money) => {
    if (this.props.money) {
      this.props.money(money);
    }
  };

  render() {
    let { itemData } = this.props;
    let { isSel, selNum, money, name, description, img } = this.state;
    return (
      <View style={ styles.container }>
        <TouchableOpacity
          style={{ marginLeft : 15 }}
          onPress={() => this.itemSelect(itemData)}>
          <Image source={isSel "color: #ff0000">三：基于Mobx实现购物车




1-：MobxShoppingCarPage.js





@observer
export default class MobxShoppingCarPage extends Component {
  static navigationOptions = {
    headerTitle : '基于MobX购物车',
  };

  constructor(props) {
    super(props);
    this.data = new MobxStore();
  };

  componentDidMount() {
    this.data.replace(jsonData)
  };

  @action
  allSelect = () => {
    DeviceEventEmitter.emit('allSelect', !this.data.itemData.isAllSelect);
    this.data.selectAll();
  };

  renderItem = (item) => {
    return (
      <MobxShopItemComponent itemData={ item } data={ this.data }/>
    )
  };

  separatorView = () => {
    return (
      <View style={{ height : 10, backgroundColor : '#e9e9e9' }}/>
    )
  };

  keyExtractor = (item) => item.name;

  render() {
    return (
      <View style={ styles.container }>
        <FlatList data={ this.data.itemData.datas }
             ItemSeparatorComponent={ this.separatorView }
             renderItem={ ({ item }) => this.renderItem(item) }
             keyExtractor={ this.keyExtractor }
        />
        <View style={ styles.tool }>
          <View style={{ flex : 1, flexDirection : 'row', alignItems : 'center' }}>
            <TouchableOpacity style={ styles.select } onPress={ this.allSelect }>
              <Image source={ this.data.itemData.isAllSelect "htmlcode">



@observer
export default class MobxShopItemComponent extends Component {

  static propTypes = {
    itemData : PropTypes.object.isRequired,
    data : PropTypes.object.isRequired,
  };

  constructor(props) {
    super(props);
    this.itemData = this.props.itemData;
  }

  componentDidMount() {
    this.subscription = DeviceEventEmitter.addListener('allSelect', (isSelAll) => {
      this.itemData.isSelect = isSelAll;
    })
  };

  componentWillUnmount() {
    this.subscription && this.subscription.remove();
  };

  @action
  selectPress = () => {
    this.itemData.isSelect = !this.itemData.isSelect;
    let money = this.itemData.money * this.itemData.count;
    if (this.itemData.isSelect) {
      this.props.data.increase(money);
    }
    else {
      this.props.data.reduce(money)
    }
    this.props.data.itemPress();
  };

  @action
  increase = () => {
    this.itemData.count += 1;
    if (this.itemData.isSelect) {
      this.props.data.increase(this.itemData.money);
    }else{
      this.itemData.isSelect = !this.itemData.isSelect;
      this.props.data.increase(this.itemData.money * this.itemData.count);
    }

  };

  @action
  reduce = () => {
    if (this.itemData.count <= 1) {
      if(this.itemData.isSelect){
        this.itemData.isSelect = !this.itemData.isSelect;
        this.props.data.reduce(this.itemData.money);
      }
      return;
    }
    this.itemData.count -= 1;
    if (this.itemData.isSelect) {
      this.props.data.reduce(this.itemData.money);
    }
  };

  render() {
    return (
      <View style={ styles.container }>
        <TouchableOpacity
          style={{ marginLeft : 15 }}
          onPress={ this.selectPress }>
          <Image source={ this.itemData.isSelect "htmlcode">



import { observable, action, computed, autorun } from 'mobx';

export default class MobxStore {
  @observable
  itemData = {}

  //设置数据
  replace = (data) => {
    this.itemData = data;
  }

  //按下的反选
  itemPress = () => {
    let i = 0;
    this.itemData.datas.map((item) => {
      if (item.isSelect != true) {
        i += 1;
      }
    });
    if (i == 0) {
      this.itemData.isAllSelect = true;
    }
    else {
      this.itemData.isAllSelect = false;
    }
  }

  //加
  increase = (money) => {
    this.itemData.totalMoney += money;
  }

  //减
  reduce = (money) => {
    this.itemData.totalMoney -= money;
  }

  //全选
  selectAll = () => {
    this.itemData.isAllSelect = !this.itemData.isAllSelect;
    this.itemData.totalMoney = 0;
    if (this.itemData.isAllSelect) {
      for (let i = 0;
        i < this.itemData.datas.length;
        i++) {
        this.itemData.totalMoney += this.itemData.datas[ i ].money * this.itemData.datas[ i ].count;
      }
    }
  }
}







四：


1-：代码github地址：https://github.com/erhutime/React-Navigation-All/tree/master/All/jscode/shoppingcar/src


2-：下载完成后，修改index.ios.js:入口文件如下：




运行效果如下：





import App from './jscode/shoppingcar/src/App'
AppRegistry.registerComponent('All', () => App);





React-Native使用Mobx实现购物车功能


以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。


                                

                                

                                     

                                
富贵资源网 Design By www.hznty.com
广告合作：本站广告合作请联系QQ：858582 申请时备注：广告合作（否则不回）
免责声明：本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除！
富贵资源网 Design By www.hznty.com
www.hznty.com 富贵资源网
20,135影音资源
44,641技术资源
2,817软件资源
435,032站长资源

友情链接

杰晶网络 DDR爱好者之家 桃源资源网 杰网资源 富贵资源网 南强小屋 铁雪资源网 幽灵资源网 万梅资源网 狼山资源网 白云岛资源网 昆仑资源网 相思资源网 明霞山资源网 内蒙古资源网 黑松山资源网 茶园资源网 饿虎岗资源网 大旗谷资源网 常春岛资源网 岱庙资源网 兴国资源网 快活林资源网 蝙蝠岛资源网 帝王谷资源网 白云城资源网 伏龙阁资源网 清风细雨楼 天枫庄资源网 圆月山庄资源网 无争山庄资源网 神水资源网 移花宫资源网 神剑山庄资源网 无为清净楼资源网 金钱帮资源网 丐帮资源网 华山资源网 极乐门资源网 小李飞刀资源网 凤求凰客栈 风云阁资源网 金狮镖局 鸳鸯亭资源网 千金楼资源网 更多链接
富贵资源网 Design By www.hznty.com