javascript - 根据服务器响应将State设置为数组

Question

我的状态有以下数据结构

this.state = {
days: [
                { day: "Monday", fromHour: 11, fromMin: 30, toHour: 17, toMin: 30, available: false },
                { day: "Tuesday", fromHour: 11, fromMin: 30, toHour: 17, toMin: 30, available: false },
                { day: "Wednesday", fromHour: 11, fromMin: 30, toHour: 17, toMin: 30, available: false },
                { day: "Thursday", fromHour: 11, fromMin: 30, toHour: 17, toMin: 30, available: false },
                { day: "Friday", fromHour: 11, fromMin: 30, toHour: 17, toMin: 30, available: false },
                { day: "Saturday", fromHour: 11, fromMin: 30, toHour: 17, toMin: 30, available: false },
                { day: "Sunday", fromHour: 11, fromMin: 30, toHour: 17, toMin: 30, available: false },
            ],
}

我期待服务器以相同格式的 availities 数组(来自 props)做出响应。

如果接收到的数组的日期匹配，我想覆盖并设置状态为仅返回的那些日期。其余保持不变。例如，如果响应是:

 { day: "Monday", fromHour: 11, fromMin: 30, toHour: 17, toMin: 30 },

我想将 State 设置为 days 数组的第一个元素，并覆盖 fromHour、toHour、fromMin、toMin 并将 available 设置为 true。这是我的下面，以及我目前陷入困境的 setState。帮助或建议？

setAvailabilities() {
    const { availabilities } = this.props;
    const { days } = this.state;
    const weekday = [];
    const daysAailable = [];


    for (i = 0; i < availabilities.length; i++) {
        for (j = 0; j < days.length; j++) {
            if (days[j].day === availabilities[i].day) {
                this.setState({
                    ...this.state.days,
//stuck here
                })
            }
        }
    }
}

Answer 1

您所在州的数据结构是:

interface State {
    days: Day[]
}

但是在 this.setState 调用中，您将数组分布在整个状态中，而不是替换数组。所以你最终会得到这样的结果:

state = {
     days: [...],
     0: { day: "Monday", fromHour: 11, fromMin: 30, toHour: 17, toMin: 30, available: false },
     1: { day: "Tuesday", fromHour: 11, fromMin: 30, toHour: 17, toMin: 30, available: false },
     // etc...
}

无论如何...

我建议构建一个新数组并立即设置整个日期数组，而不是为每个更新的日期调用 this.setState:

setAvailabilities() {
    const { availabilities } = this.props;
    const { days } = this.state;

    const nextDays = [...days]

    for (i = 0; i < availabilities.length; i++) {
        for (j = 0; j < nextDays.length; j++) {
            if (nextDays[j].day === availabilities[i].day) {
                nextDays[j] = availabilities[i]
            }
        }
    }

    this.setState({ days: newDays })
}