Vue component practice: development of sliding selector component

Vue component practice: sliding selector component development

Introduction:
The sliding selector is a common interactive component that can be used on the mobile side Or on the desktop, you can select date, time, city and other functions. This article will introduce how to use the Vue framework to develop a sliding selector component through example code.

Background:
The sliding selector component generally consists of multiple sliding areas, each sliding area represents a selected dimension, such as year, month, day, etc. The user can make a selection by sliding the selector with his finger, and the sliding area will scroll along with the finger sliding, and finally determine the user's choice.

Step 1: Create a Vue component
First, we need to create a Vue component for rendering the sliding selector. In the Vue component, we need to define the data, template and methods of the component.

<template>
  <div class="slider">
    <div v-for="(option, index) in options" :key="index" class="slider-item">
      {{ option }}
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      options: ['Option 1', 'Option 2', 'Option 3']
    };
  }
};
</script>

<style scoped>
.slider {
  display: flex;
}

.slider-item {
  flex: 1;
  height: 100px;
  border: 1px solid #ccc;
}
</style>

In the above code, we use Vue's data binding function to render data into the template through {{ option }}. Each sliding area corresponds to a <div> element, and its height and width can be adjusted according to actual needs.

Step 2: Implement the sliding effect
To implement the sliding effect, you need to add sliding event processing logic. First, we need to listen for sliding events in Vue's life cycle hook function mounted.

<script>
export default {
  data() {
    return {
      options: ['Option 1', 'Option 2', 'Option 3']
    };
  },
  mounted() {
    const container = this.$el;
    container.addEventListener('touchstart', this.handleTouchStart);
    container.addEventListener('touchmove', this.handleTouchMove);
    container.addEventListener('touchend', this.handleTouchEnd);
  },
  methods: {
    handleTouchStart(event) {
      // 记录滑动开始时的初始位置
    },
    handleTouchMove(event) {
      // 处理滑动过程中的位置变化
    },
    handleTouchEnd(event) {
      // 根据最终位置确定最终选择结果
    }
  }
};
</script>

In the sliding event processing method, we can obtain the location information of the touch event through event.touches. Based on the position change, we can calculate the sliding offset to achieve the sliding effect.

Step 3: Calculate the sliding position
In the handleTouchStart method, we need to record the initial position when the sliding starts.

handleTouchStart(event) {
  this.startY = event.touches[0].pageY;
}

In the handleTouchMove method, we need to handle the position change during the sliding process and calculate the sliding offset based on the position change.

handleTouchMove(event) {
  const currentY = event.touches[0].pageY;
  this.offsetY = currentY - this.startY;
}

In the handleTouchEnd method, we need to determine the final selection result based on the final position. Here we can calculate the final selected index value based on the sliding offset.

handleTouchEnd(event) {
  const index = Math.round(this.offsetY / this.itemHeight);
  if (index >= 0 && index < this.options.length) {
    this.selected = this.options[index];
  }
}

Step 4: Render the final result
In the template, we can use {{ selected }} to render the final selection result onto the page.

<template>
  <div class="slider">
    <div v-for="(option, index) in options" :key="index" class="slider-item">
      {{ option }}
    </div>
    <div class="selected">{{ selected }}</div>
  </div>
</template>

<style scoped>
.selected {
  margin-top: 10px;
  text-align: center;
  font-weight: bold;
}
</style>

Through the above steps, we have completed the development of a basic sliding selector component. You can add more sliding areas and styles according to actual needs, and further improve the sliding logic.

Conclusion:
This article introduces the method of using Vue to develop a sliding selector component and gives specific sample code. Through this example, we can better understand how Vue components are developed and learn how to use sliding events to handle the effect of sliding selectors. I hope this article can be helpful to readers interested in Vue component development.

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