How to download offline maps in the Amap Vue project

With the popularity of mobile phones and the development of the Internet, people are increasingly dependent on mobile devices and the Internet. In this era of relying on the Internet, offline maps have become an essential tool for many people when traveling. Amap is one of the most popular maps on the market, and Vue, as one of the most popular JavaScript frameworks, is increasingly used in map development. In this article, we will learn how to download offline maps in the Amap Vue project.

First of all, we need to add the official Amap Vue library to facilitate our development. You can install it using the following statement on the command line:

npm install vue-amap --save

Then introduce it into the project:

import VueAMap from 'vue-amap';
 
Vue.use(VueAMap);

You can then use the initAMapApiLoader method of the VueAMap object in an instance of Vue:

<template>
  <div id="app">
    <el-amap
      :zoom="zoom"
      :center="center"
      :plugin="&#39;MapType,BasicInfoWindow&#39;"
      :events="events"
    >
      <el-amap-marker :position="center" />
      <el-amap-info-window :position="center">
        <h1>{{ address }}</h1>
      </el-amap-info-window>
    </el-amap>
  </div>
</template>
 
<script>
export default {
  data() {
    return {
      zoom: 15,
      center: [116.397428, 39.90923],
      address: '',
      events: {
        init: (mapInstance) => {
          this.address = '北京市朝阳区酒仙桥街道798';
        },
      },
    };
  },
 
  created() {  
    this.$nextTick(() => {
      this.$AMap.plugin(['AMap.Geocoder'], function () {
        var geocoder = new AMap.Geocoder({
          city: '010' // 将城市信息作为参数传递
        })
        var lnglat = [116.396574, 39.992706]
        geocoder.getAddress(lnglat, function (status, result) {
          if (status === 'complete' && result.regeocode) {
            console.log(result.regeocode.formattedAddress)
            console.log(result)
          } else {
            console.log('没有结果')
          }
        })
      })
    });
  },
}
</script>

Next, let’s consider how to download an offline map. First, find the city you want to download offline, open the Amap app and navigate to the city (please make sure your device is connected to the Internet). Then, in the lower right corner of the map view, you should see a round "i" button, click on it to open the map tiles download page.

In the tile download page, you can choose the size and level of the download area. The map will divide your selected area into multiple areas of the same size (usually 1km x 1km). You can zoom in or out on the area you want to download by adjusting the level. After selecting, click the "Download" button to start downloading and using the map offline.

When the download is complete, you can view your offline maps in the "My Offline Maps" tab.

Using offline maps in Vue projects requires some special processing. Here are some basic methods that can help you implement offline maps in your Vue project:

this.$AMap.plugin('AMap.TileLayer', () => {
  const tileLayer = new AMap.TileLayer({
    map: mapInstance,
    tileSize: 256,
    tileUrl: '{z}/{x}/{y}',
    zIndex: 0,
  });

  for (let i = 0; i < this.tileLayerUrls.length; i++) {
    tileLayerUrls.push(this.tileLayerUrls[i].replace(&#39;{s}&#39;, &#39;http://webst01.is.autonavi.com/appmaptile&#39;));
  }

  tileLayer.setTiles(this.tileLayerUrls, 256, 256);

  tileLayer.on(&#39;complete&#39;, () => {
    this.loaded = true;
  });

  tileLayer.on('error', () => {
    this.loaded = true;
  });
});

In the code, tileLayerUrls is downloaded from the offline downloaded tiles from Amap List of URL links. You can store them in global variables and call the method when the map is initialized.

In short, it is very easy to use Amap offline map in Vue project. You just need to download the map, store the tile link in a global variable, and use that variable in your Vue project. Read the code snippets in the text, follow the instructions and you can easily use offline maps too.

The above is the detailed content of How to download offline maps in the Amap Vue project. For more information, please follow other related articles on the PHP Chinese website!