检查一个字符串是否包含另一个字符串 React Native [英] Check if a string contains another string React Native

问题描述

我正在尝试像这样过滤数据数组:

让数据=[{"批准": "TPED",制造商":切斯特菲尔德"},{"批准": "BV",制造商":Faber"}]让批准变量 = "TP"让filteredData = data.filter(x => x.approval.includes(approvalVariable))console.log(filteredData)

所以如果approvalVariable是TP"，我希望新数组是:

<预><代码>[{"批准": "TPED",制造商":切斯特菲尔德"},]

当我这样做时，它可以工作:

let filtersData = data.filter(x => x.approval == ApprovalVariable)

但是当我尝试时:

x.approval.includes(approvalVariable)

我得到一个错误，x.approval.includes 不是一个对象

我曾经用 .includes() 让它工作过，但现在出了点问题.

任何帮助将不胜感激.

 componentWillMount() {this.fetchData();}fetchData = async() =>{var fireBaseResponse = firebase.database().ref();fireBaseResponse.once('value').then(snapshot => {让数据1 = [];让批准 = this.props.navigation.state.params.approval让评论 = this.props.navigation.state.params.comments让 designStandard = this.props.navigation.state.params.designStandard让直径 = this.props.navigation.state.params.diameter让 h2Compatible = this.props.navigation.state.params.h2compatible让入口线程 = this.props.navigation.state.params.inletThread让制造商 = this.props.navigation.state.params.manufacturer让规范编号 = this.props.navigation.state.params.specificationNumber让 testPressure = this.props.navigation.state.params.testPressure让 waterCapacity = this.props.navigation.state.params.waterCapacity让workingPressure = this.props.navigation.state.params.workingPressure快照.forEach(项目=>{const temp = item.val();data1.push(temp);返回假；});////////过滤方法////////如果(批准 == ''){控制台日志(好")}别的 {data1 = data1.filter(x => x.approval.includes(approval))}如果(水容量 == ''){控制台日志(好")}别的 {data1 = data1.filter(x => x.waterCapacity == waterCapacity)}如果(设计标准== ''){控制台日志(好")}别的 {data1 = data1.filter(x => x.designStandard == designStandard)}如果(直径==''){控制台日志(好")}别的 {data1 = data1.filter(x => x.diameter == 直径)}如果(入口线程 == ''){控制台日志(好")}别的 {data1 = data1.filter(x => x.inletThread == inletThread)}如果(工作压力==''){控制台日志(好")}别的 {data1 = data1.filter(x => x.workingPressure == workingPressure)}如果(评论 == ''){控制台日志(好")}别的 {data1 = data1.filter(x => x.comments == 评论)}如果(制造商 == ''){控制台日志(好")}别的 {data1 = data1.filter(x => x.manufacturer == 制造商)}如果(测试压力 == ''){控制台日志(好")}别的 {data1 = data1.filter(x => x.testPressure == testPressure)}如果(规范编号 == ''){控制台日志(好")}别的 {data1 = data1.filter(x => x.specificationNumber == specificationNumber)}if(h2Compatible == '') {控制台日志(好")}别的 {data1 = data1.filter(x => x.h2Compatible == h2Compatible)}/////////////////////过滤方法//////////////////this.setState({data: data1});});}使成为(){var {navigate} = this.props.navigation;让 {params} = this.props.navigation.state;返回(<视图容器><滚动视图><平面列表数据 = {this.state.data}keyExtractor = {(x, i) =>一世}renderItem ={({item}) =><文本样式 = {styles.itemText}>批准:{item.approval} |制造商:{item.manufacturer} |规格编号:{item.specificationNumber} |H2 兼容:{item.h2Compatible} |直径:{item.diameter} |水容量:{item.waterCapacity} |入口线程:{item.inletThread}{"\n"}</文本>}/></滚动视图><查看样式={styles.footer}><TouchableOpacity style ={styles.footerButton} onPress = { () =>导航(ValveSearchScreen")}><文本样式 ={styles.footerButtonText}>SEARCH</Text></TouchableOpacity></查看></ViewContainer>)}}

解决方案

问题是它在名为 includes 的数组对象中搜索属性.显然它找不到它，所以它警告我该财产不存在.为了解决这个问题，我将行更改为

let filtersData = data.filter(x => String(x.approval).includes(approvalVariable));

我希望这会在未来帮助其他人，而您不会像我一样在没有帮助的情况下花一周时间尝试解决问题.

I am trying to filter an array of data like so:

let data = 
[
   {
    "approval": "TPED",
    "manufacturer": "Chesterfield"
   },
   {
    "approval": "BV",
    "manufacturer": "Faber"
   }
]

let approvalVariable = "TP"
let filteredData = data.filter(x => x.approval.includes(approvalVariable))

console.log(filteredData)

So if approvalVariable is "TP", I want the new array to be:

[
   {
    "approval": "TPED",
    "manufacturer": "Chesterfield"
   },
]

I have it working when I do:

let filteredData = data.filter(x => x.approval == approvalVariable)

But when I try:

x.approval.includes(approvalVariable)

I get an error that x.approval.includes is not an object

I had it working at one point with .includes() but something is going wrong now.

Any help would be greatly appreciated.

  componentWillMount() {
    this.fetchData();
  }

 fetchData = async () => {
   var fireBaseResponse = firebase.database().ref();
   fireBaseResponse.once('value').then(snapshot => {
     let data1 = [];
     let approval = this.props.navigation.state.params.approval
     let comments = this.props.navigation.state.params.comments
     let designStandard = this.props.navigation.state.params.designStandard
     let diameter = this.props.navigation.state.params.diameter
     let h2Compatible = this.props.navigation.state.params.h2compatible
     let inletThread = this.props.navigation.state.params.inletThread
     let manufacturer = this.props.navigation.state.params.manufacturer
     let specificationNumber = this.props.navigation.state.params.specificationNumber
     let testPressure = this.props.navigation.state.params.testPressure
     let waterCapacity = this.props.navigation.state.params.waterCapacity
     let workingPressure = this.props.navigation.state.params.workingPressure


    snapshot.forEach(item =>{
        const temp = item.val();
        data1.push(temp);
        return false;
      });
////////Filter Method/////////
      if(approval == '') {
        console.log("good")
      }
      else {
        data1 = data1.filter(x => x.approval.includes(approval))
      }
      if(waterCapacity == '') {
        console.log("good")
      }
      else {
        data1 = data1.filter(x => x.waterCapacity == waterCapacity)
      }
      if(designStandard== '') {
        console.log("good")
      }
      else {
        data1 = data1.filter(x => x.designStandard == designStandard)
      }
      if(diameter == '') {
        console.log("good")
      }
      else {
        data1 = data1.filter(x => x.diameter == diameter)
      }
      if(inletThread == '') {
        console.log("good")
      }
      else {
        data1 = data1.filter(x => x.inletThread == inletThread)
      }
      if(workingPressure == '') {
        console.log("good")
      }
      else {
        data1 = data1.filter(x => x.workingPressure == workingPressure)
      }
      if(comments == '') {
        console.log("good")
      }
      else {
        data1 = data1.filter(x => x.comments == comments)
      }

      if(manufacturer == '') {
        console.log("good")
      }
      else {
        data1 = data1.filter(x => x.manufacturer == manufacturer)
      }
      if(testPressure == '') {
        console.log("good")
      }
      else {
        data1 = data1.filter(x => x.testPressure == testPressure)
      }

      if(specificationNumber == '') {
        console.log("good")
      }
      else {
        data1 = data1.filter(x => x.specificationNumber == specificationNumber)
      }
      if(h2Compatible == '') {
        console.log("good")
      }
      else {
        data1 = data1.filter(x => x.h2Compatible == h2Compatible)
      }


/////////////////////Filter Method//////////////////

      this.setState({data: data1});

    });
  }
  render(){
    var {navigate} = this.props.navigation;
    let {params} = this.props.navigation.state;
    return(
    <ViewContainer>
        <ScrollView>
         <FlatList
                data = {this.state.data}
                keyExtractor = {(x, i) => i}
                renderItem ={({item}) =>
                    <Text style = {styles.itemText}>
                        Approval: {item.approval} | Manufacturer: {item.manufacturer} | Specification Number: {item.specificationNumber} |
                        H2 Compatible: {item.h2Compatible} | Diameter: {item.diameter} | Water Capacity: {item.waterCapacity} |
                        Inlet Thread: {item.inletThread}{"\n"}
                    </Text>
                }
            />
        </ScrollView>
            <View style ={styles.footer}>
                <TouchableOpacity style ={styles.footerButton} onPress = { () => navigate("ValveSearchScreen")}>
                    <Text style ={styles.footerButtonText}>SEARCH</Text>
                </TouchableOpacity>
            </View>
    </ViewContainer>

    )
  }
}

解决方案

The problem was that it was searching for a property within the array object called includes. Obviously it could not find it so it was giving me the warning that the property did not exist. To fix this I changed the line to

let filteredData = data.filter(x => String(x.approval).includes(approvalVariable));

I hope this helps somebody else out in the future and you don't spend a week trying the figure it out with no help like I did.

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