How to implement city selector using Vue?

In recent years, front-end technology has been constantly updated, and the emergence of front-end frameworks has also greatly improved the efficiency of our daily development. Under the framework of Vue.js, we can easily implement many commonly used functional components, such as city selectors.

So, how to implement the city selector in Vue? This article will share with you a simple implementation method.

1. Data preparation

Before implementing the city selector, we need to prepare city data. Since there is a lot of city data, we need to use a JSON data format to store it. Here, I provide a JSON data file that you can find online or in other resources.

City data file sample:

[ { "label": "北京市", "value": "110000", "children": [ { "label": "北京市", "value": "110100", "children": [ { "label": "东城区", "value": "110101" }, { "label": "西城区", "value": "110102" }, { "label": "崇文区", "value": "110103" }, ... ] } ] }, { "label": "上海市", "value": "310000", "children": [ { "label": "上海市", "value": "310100", "children": [ { "label": "黄浦区", "value": "310101" }, { "label": "徐汇区", "value": "310104" }, { "label": "长宁区", "value": "310105" }, ... ] } ] }, ... ]

2. Selector component implementation

2.1 Introduction of city data

We need to introduce it in the script part of the component City data:

2.2 Define the selector component

Since the city selector can be used in multiple places, we can define it as a component. In this component, we need to define some properties and methods.

Attributes:

• modelValue: currently selected city value;
• placeholder: prompt in the selector input box;
• width: The width of the selector input box;
• disabled: whether the selector is disabled;
• readonly: whether the selector is read-only.

Method:

• handleChangeCity: Callback method after selecting a city.

2.3 Rendering city data

Displaying city data in the selector requires recursive rendering. When rendering, we need to define a function to recursively traverse the city data of each layer. Since the city data may have multiple levels, we need to traverse it recursively. In the code implementation, we use the template defined in the Vue component for rendering.

2.4 Complete selector component code

The final city selector component code is as follows:

3. Use the city selector

in Using the city selector component in the Vue project is very simple. You only need to introduce the city selector component into the page you want to use, and then pass in the corresponding parameters when using it. The following is a code example:

At this point, we can already use the city selector component in the Vue application. The code of this city selector component is very simple, but it implements the basic city selection function and can be expanded and optimized according to your own needs.

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