How to implement the city selector function in uniapp

Uniapp (Universal App) is a cross-platform development framework based on Vue.js that can be used to develop iOS, Android and Web applications at the same time. Implementing the city selector function in uniapp is a common requirement. This article will introduce how to implement this function in uniapp, and attach corresponding code examples.

First, we need to create a new page in the uniapp project, named city-selector.

Next, in the template of the city-selector page, we can use the Picker component officially provided by uni-app to implement the city selector. The Picker component can achieve a scrolling selection effect and is very suitable for city selection.

Here is the sample code:

<template>
  <view>
    <picker v-model="selectedCity" range="{{cityList}}" @change="onChangeCity"></picker>
  </view>
</template>

In the script section, we need to define the city list and the selected city. You can define a cityList array in data to store the city list, and use selectedCity as the selected city.

The following is a sample code:

<script>
export default {
  data() {
    return {
      cityList: ['北京', '上海', '广州', '深圳'],
      selectedCity: ''
    }
  },
  methods: {
    onChangeCity(event) {
      this.selectedCity = this.cityList[event.detail.value]
    }
  }
}
</script>

In the above code, selectedCity is two-way bound through v-model and Picker components. When the value of the selector changes, the onChangeCity method is triggered, which stores the selected city in selectedCity.

Finally, we need to use this component in the city selector page, add a button in App.vue, and jump to the city selector page when the button is clicked.

The following is a sample code:

<template>
  <view>
    <button @click="gotoCitySelector">选择城市</button>
  </view>
</template>

<script>
export default {
  methods: {
    gotoCitySelector() {
      uni.navigateTo({
        url: '/pages/city-selector/city-selector'
      })
    }
  }
}
</script>

In the above code, the page jump function is implemented through the uni.navigateTo method to jump to the city selector page.

Through the above code example, we can see how to implement the city selector function in uniapp. Through the Picker component and related data binding, we can implement a simple and practical city selector. The use of the selector in the project can be customized as needed. I hope this article can be helpful to your development work.

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