在react native中点击座位号时如何获取座位号

vkc1a9a2 于 2022-12-23 发布在 React

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我已经使用了for循环并在click函数中给出了它的值，这样我就可以在点击座位时获得座位号，但每次点击座位时我只获得for循环的最后一个编号。谁能告诉我如何获得每个座位的座位号？API数据是

var seats = [
    { name: "Premium", seattotal: "15", cost: "250", id: "1" },
    { name: "Club", seattotal: "30", cost: "150", id: "2" },
    { name: "Diamond", seattotal: "25", cost: "170", id: "3" },
    { name: "Gold", seattotal: "20", cost: "170", id: "4" },
    ];

    function handleClick(seatnumber, seatamount, seatname) {
    alert(seatnumber + " " + count + " " + seatamount + " " + 
    seatname);
    setIsActive((oldArray) => [...oldArray, seatnumber]);
    setAmount((oldamt) => parseFloat(oldamt) + parseFloat(seatamount));
    if (selectseat.includes(seatname) === false) {
      setSelectSeat((oldArray) => [...oldArray, seatname]);
    }
    console.log(isActive + " " + selectseat);
    }

    function seat(totalseat, seatcost, seatname) {
    var seats = [];
    for (var i = 1; i <= totalseat; i++) {
      seats.push(
        i % 5 ? (
          <TouchableOpacity
            key={i}
            style={isActive == i ? styles.activeseat : styles.seat}
            onPress={(event) => handleClick(i, seatcost, seatname)}
          >
            <Text style={{ fontSize: 10 }}>{i}</Text>
          </TouchableOpacity>
        ) : (
          <TouchableOpacity
            key={i}
            style={
              isActive == i
                ? { ...styles.activeseat, marginRight: 30 }
                : { ...styles.seat, marginRight: 30 }
            }
            onPress={(event) => handleClick(i, seatcost, seatname)}
          >
            <Text style={{ fontSize: 10 }}>{i}</Text>
          </TouchableOpacity>
        )
      );
    }
    totalseat != 0
      ? seats.push(
          <View
            key={i}
            style={{ backgroundColor: "white", height: 20, width: 
    "100%" }}
          ></View>
        )
      : "";
    
    return seats;

    }
    const allseatui = Object.keys(seats).map((key) => {
    const varseat = seat(
      seats[key].seattotal,
      seats[key].cost,
      seats[key].name
    );
    if (seats[key].name != undefined) {
      return (
        <View key={seats[key].id}>
          <Text style={{ margin: 12, fontSize: 14, color: "grey" }}>
            {seats[key].name} Rs {seats[key].cost}
          </Text>
          <View
            style={{
              flexDirection: "row",
              flexWrap: "wrap",
            }}
          >
            {varseat}
          </View>
        </View>
      );
    }
    });

react-native

来源：https://stackoverflow.com/questions/74325160/how-do-get-seat-no-when-click-on-it-in-react-native

2条答案

按热度按时间

vlju58qv1#

问题

i被声明为var，并在填充seats数组时的for循环中发生变化。因为这是一个常规的for循环，所以每个onPresshandleClick回调处理程序正在访问的作用域中只有一个i变量引用。在最后一次迭代中，i再次递增，并且由于它现在严格大于totalseat，所以退出循环。当totalseat等于"20"且退出条件为i <= 20时，将存在20次迭代且i在退出时将等于21。

溶液

使用Array.prototype.map函数将长度为totalseat的数组Map到要保存到seats数组中的JSX。.map回调函数将接收当前Map索引值的副本。

const seats = Array(totalseat).fill().map((_, i) => (
  <TouchableOpacity
    key={i}
    style={
      ...isActive === (i + 1) ? styles.activeSeat : styles.seat,
      ...(i + 1) % 5 ? {} : { marginRight: '30' }
    }
    style={isActive == i ? styles.activeseat : styles.seat}
    onPress={() => handleClick(i + 1, seatcost, seatname)}
  >
    <Text style={{ fontSize: 10 }}>{i + 1}</Text>
  </TouchableOpacity>
));

if (totalseat) { // any non-zero value is truthy
  seats.push(
    <View
      key={totalseat + 1}
      style={{ backgroundColor: "white", height: 20, width: 
"100%" }}
    />
  );
}

return seats;

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l0oc07j22#

使用Map代替For循环。for循环在循环运行时会改变i值

赞(0）回复(0）举报 2022-12-23