What should I do if the amap click event encapsulated by vue fails?

When using AMAP in the Vue framework, we often encounter the problem of invalid click events caused by encapsulating amap. The main reason for this problem is that because of the particularity of the Amap JS API, the map click event needs to be encapsulated. This article will discuss in detail the reasons and solutions for click event failure when Vue encapsulates amap maps.

1. Problem Description

In Vue, creating an Amap instance is very simple. You only need to introduce the Amap JS API and create a div container, and call the API to create a map instance. . However, when encapsulating the amap component, we need to encapsulate some complex map operations, including click events, etc.

For example, create a map component that can trigger events by clicking on the map. Many people directly encapsulate the click event. The implementation method is as follows:

export default {
  data() {
    return {
      map: null
    };
  },
  mounted() {
    this.initMap();
  },
  methods: {
    initMap() {
      let options = {
        zoom: 14,
        center: [116.397428, 39.90923]
      };
      this.map = new AMap.Map("mapContainer", options);
      // 绑定点击事件
      this.map.on("click", this.handleClick);
    },
    handleClick(event) {
      console.log(event.lnglat);
    }
  }
}

This method seems very simple, but in fact In Vue, after binding the click event of the map, it is very likely that the event will not be triggered, that is, the click event will be invalid.

2. Problem Analysis

The problem lies in the particularity of the Vue framework. Vue will automatically clear the event listener when updating the DOM, causing the function bound to the "click" event to become invalid.

The instructions supported by the Vue framework can be used to control the content and attributes of DOM elements, but they cannot bind or unbind events to DOM elements. The way to listen to events in Vue is to use the syntactic sugar of @event name on the component.

When encapsulating the map component, after the Vue component is rendered into the DOM, its listening events will be automatically cleared by the Vue framework. This will cause the function bound to the map "click" event to fail.

3. Solution

In order to solve this problem, we need to encapsulate a component, maintain a reference to the map instance inside the component, and destroy the map instance before the Vue component is unloaded, so that we can avoid The event listener is cleared.

When encapsulating the amap component with Vue, we can use the life cycle function provided by Vue to control the creation and destruction of map instances.

The following is an example of encapsulating the Vue map component and solving the failure of click events:

<template>
  <div></div>
</template>

<script>
import AMap from "AMap";

export default {
  data() {
    return {
      map: null
    };
  },
  mounted() {
    this.initMap();
  },
  beforeDestroy() {
    this.destroyMap();
  },
  methods: {
    initMap() {
      let options = {
        zoom: 14,
        center: [116.397428, 39.90923]
      };
      this.map = new AMap.Map(this.$refs.mapContainer, options);
      this.map.on("click", this.handleClick);
    },
    handleClick(event) {
      console.log(event.lnglat);
    },
    destroyMap() {
      if (this.map) {
        this.map.destroy();
      }
    }
  }
}
</script>

In this code, we create a map instance in the mounted life cycle function of the Vue component, And the "click" event is bound. In the beforeDestroy life cycle function of the Vue component, we destroy the map instance. At this time, the Vue component is about to be unloaded. At this time, the event listener will not be cleared, so the "click" event can be triggered normally.

Using the above code, we can solve the problem of click event failure when encapsulating amap components in Vue. It should be noted that the Vue component must be cleared before and after to avoid the problem of event listeners being cleared.

4. Summary

For the unique combination of Vue framework and Amap JS API, we are prone to encounter various problems when developing pages, including click event failure and other issues. .

The key to solving the problem is to understand how the Vue framework and the Amap JS API work and how they interact. At the same time, when writing Vue components, you need to pay attention to the use of life cycle functions. Be sure to clear event listeners and map instances before uninstalling to avoid the problem of the Vue framework automatically clearing event listeners.

I hope this article can help you solve the problem of click event failure in the Vue encapsulated amap map component.

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