Vue is a very popular front-end framework. It provides many tools and functions, such as componentization, data binding, event processing, etc., which can help developers build efficient, flexible and easy-to-maintain Web applications. In this article, I will introduce how to implement a calendar component using Vue.

1. Requirements analysis

First, we need to analyze the requirements of this calendar component. A basic calendar should have the following functions:

• Display the calendar page of the current month;
• Support switching to the previous month or next month;
• Support click On a certain day, jump to the specific information page of that day.

2. Component splitting

According to needs, we can split out the following components:

• Calendar component (Calendar): Responsible for displaying the entire calendar Interface;
• Header component (Header): responsible for displaying the current month information and switching buttons;
• Calendar body component (Body): responsible for displaying the main part of the calendar, that is, the number of days.

3. Component writing

Now, we write the specific implementation of each component.

Header component

The main responsibility of the head component is to display the current month information and provide month switching function. We can implement month switching through a Select component. The code is as follows:

<template>
  <div class="header">
    <select v-model="currentMonth" @change="onMonthChange">
      <option v-for="month in months" :value="month.value">{{ month.label }}</option>
    </select>
    <button @click="nextMonth">Next</button>
    <button @click="prevMonth">Prev</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      currentMonth: new Date().getMonth() + 1,
      months: [
        { value: 1, label: 'January' },
        { value: 2, label: 'February' },
        { value: 3, label: 'March' },
        { value: 4, label: 'April' },
        { value: 5, label: 'May' },
        { value: 6, label: 'June' },
        { value: 7, label: 'July' },
        { value: 8, label: 'August' },
        { value: 9, label: 'September' },
        { value: 10, label: 'October' },
        { value: 11, label: 'November' },
        { value: 12, label: 'December' },
      ],
    };
  },
  methods: {
    nextMonth() {
      this.currentMonth++;
      if (this.currentMonth > 12) {
        this.currentMonth = 1;
      }
    },
    prevMonth() {
      this.currentMonth--;
      if (this.currentMonth < 1) {
        this.currentMonth = 12;
      }
    },
    onMonthChange() {
      // 處理月份切換
    },
  },
};
</script>

Here we implement month switching through a Select component, and declare the current month currentMonth and the list of all months months in the component. . At the same time, we also added nextMonth and prevMonth methods to the component to implement the month switching function.

Calendar Main Component

The main responsibility of the calendar main component is to display the main part of the calendar, that is, the days. To achieve this functionality, we can use a for loop to iterate through the days of the current month and render them. At the same time, we also need to take into account that the calendar component spans multiple months, so we need to calculate the number of days in each month and the day of the week that the first day of each month is. For this problem, we can use Moment.js library for date/time processing. The code is as follows:

<template>
  <div class="body">
    <div class="day" v-for="day in days" :key="day" :class="{ disabled: day === 0 }" @click="onClick(day)">
      {{ day === 0 ? '' : day }}
    </div>
  </div>
</template>

<script>
import moment from 'moment';

export default {
  props: {
    month: Number,
    year: Number,
  },
  data() {
    return {
      days: [],
    };
  },
  computed: {
    startDay() {
      return moment(`${this.year}-${this.month}-01`).day();
    },
    totalDays() {
      return moment(`${this.year}-${this.month}`, 'YYYY-MM').daysInMonth();
    },
  },
  methods: {
    onClick(day) {
      if (day !== 0) {
        // 跳轉(zhuǎn)到該天的具體信息頁(yè)面
      }
    },
  },
  mounted() {
    let days = Array.from({ length: 42 }).fill(0);
    for (let i = 1; i <= this.totalDays; i++) {
      days[i + this.startDay - 1] = i;
    }
    this.days = days;
  },
};
</script>

Here we first introduced the Moment.js library and defined two props, month and year, in the component to represent the month and year to which the current calendar body belongs. Then, we defined two computed properties: startDay and totalDays, which are used to calculate the day of the week and the number of days in the month respectively when the first day of the current month is. Finally, we use the mounted hook function to initialize the days data, and use a for loop to traverse the days of each month and render them on the page.

Calendar Component

Finally, let’s write the entire calendar component. The main responsibility of the calendar component is to integrate the above two components and handle some global logic. The code is as follows:

<template>
  <div class="calendar">
    <Header />
    <div class="weekdays">
      <div class="weekday">Sun</div>
      <div class="weekday">Mon</div>
      <div class="weekday">Tue</div>
      <div class="weekday">Wed</div>
      <div class="weekday">Thu</div>
      <div class="weekday">Fri</div>
      <div class="weekday">Sat</div>
    </div>
    <Body :month="currentMonth" :year="currentYear" />
  </div>
</template>

<script>
import Header from './Header.vue';
import Body from './Body.vue';

export default {
  components: {
    Header,
    Body,
  },
  data() {
    return {
      currentMonth: new Date().getMonth() + 1,
      currentYear: new Date().getFullYear(),
    };
  },
};
</script>

Here, we introduce the Header and Body components and nest them in a container. At the same time, we also declare the current month and year in the component.

4. Use the calendar component

Now, we can use our calendar component wherever a calendar is needed. For example:

<template>
  <div>
    <Calendar /> <!-- 展示日歷組件 -->
  </div>
</template>

<script>
import Calendar from './Calendar.vue';

export default {
  components: {
    Calendar,
  },
};
</script>

In this way, we have successfully implemented a simple calendar component using Vue. Of course, this is just a basic version, and you can extend its functions or beautify its interface according to your actual needs. Hope this article can be helpful to you.

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