How to use JS and Amap to implement location area search function

How to use JS and Amap to implement location area retrieval function

With the popularity of mobile phones and the Internet, map navigation has become indispensable in our daily lives tool. The location area search function is also very common in map applications. For example, we can find nearby restaurants, movie theaters, gas stations, etc. through the search function.

This article will introduce how to use JS and Amap API to implement the location area retrieval function, and provide specific code examples.

1. Get the Amap Developer Key
   First, we need to register a developer account on the Amap open platform and obtain the developer Key. When using the Map API, you need to pass the Key as a parameter, and depending on the usage of the Map API, you may need to pay. For specific steps to obtain a developer key, please refer to the documentation of the Amap open platform.
2. Introducing the Amap API
   In the head of the HTML document, we need to introduce the API file of the Amap. The sample code is as follows:

<script src="https://webapi.amap.com/maps?v=1.4.15&key=your-key"></script>

Among them, your-key needs to be replaced with your own developer Key.

3. Create a map container
   In the HTML document, we need to create a map container to display the map. The sample code is as follows:

<div id="mapContainer"></div>

4. Initialize the map object
   In the JS code, we need to initialize a map object. The sample code is as follows:

var map = new AMap.Map("mapContainer", {
  resizeEnable: true,
  zoom: 13
});

Among them, mapContainer is the id of the map container, and zoom specifies the initial zoom level of the map.

5. Implementing location area retrieval function
   Next, we need to add a search box and a search button. Users can enter keywords in the search box. After clicking the search button, it will be displayed on the map. Locations that match the keywords.

In the HTML document, the sample code for adding the search box and search button is as follows:

<input type="text" id="keywordInput" />
<button onclick="search()">搜索</button>

In the JS code, the sample code for adding the search function is as follows:

function search() {
  var keyword = document.getElementById("keywordInput").value;

  AMap.service(["AMap.PlaceSearch"], function() {
    var placeSearch = new AMap.PlaceSearch({ map: map });
    placeSearch.search(keyword);
  });
}

Among them, the AMap.service method will asynchronously load (lazy loading) the required AMAP service, so you need to create a location search object in the callback function of this method and call searchMethod to search.

6. Realize the display of location area search results
   When the user clicks the search button, locations matching the keywords will be displayed on the map. We can add an event listener to the map. When the search results are displayed, we can perform some additional processing on the search results, such as adding markers on the map, displaying nearby locations, etc.

In the JS code, the sample code for adding an event listener is as follows:

map.on("complete", function() {
  // 当地图加载完成时，触发该事件
  // 在这里可以对搜索结果进行一些额外的处理
  // 比如在地图上添加标记点、显示附近的位置等等
});

Through the above steps, we have realized the use of JS and Amap API to achieve location area retrieval. Function. Hope this article can be helpful to you.

References:

• AMAP Open Platform Document (https://lbs.amap.com/api/javascript-api/summary/)
• AMAP open platform API example (https://lbs.amap.com/demo/)

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