How to implement geographical positioning and map display functions through the Webman framework?

How to implement geographical location positioning and map display functions through the Webman framework?

Webman is an open source framework for rapid development of Web applications based on Python. Using the Webman framework, we can easily implement various functions, including geographical location positioning and map display. This article will introduce how to implement these functions through the Webman framework, and attach code examples.

First, we need to install the Webman framework. Enter the following command on the command line to install Webman:

pip install webman

After the installation is completed, we can start to develop our geographical positioning and map display functions.

1. Geolocation Positioning

First, we need to use a geolocation API to obtain the user's geolocation information. Here, we take Baidu Maps’ geocoding API as an example. We can use Python's requests library to send HTTP requests and obtain geographical location information.

import requests

def get_location(address):
    url = 'http://api.map.baidu.com/geocoding/v3/?address={}&output=json&ak=your_api_key'.format(address)
    try:
        response = requests.get(url)
        data = response.json()
        location = data['result']['location']
        return location['lng'], location['lat']
    except Exception as e:
        print('Error:', e)

In the above code, we use a get_location function to obtain the latitude and longitude information of the specified address. Among them, the address parameter is the address to be queried, and your_api_key is the API key you applied for on the Baidu Map Open Platform.

2. Map display

Next, we need to create a web page in the Webman framework to display the map. We can use Baidu Maps' JavaScript API to create a map and display location markers.

Create a static folder in the Webman framework and put the JavaScript API file of Baidu Map into the folder. Then, create a web page in the Webman framework to display the map.

from webman import Webman, render_template

app = Webman()

@app.route('/')
def index():
    return render_template('index.html')

if __name__ == '__main__':
    app.run()

In the above code, we created a route named index, which will render a template file named index.html.

In the index.html template file, we need to introduce the JavaScript API of Baidu Map and create a <div> tag to display the map, as shown below :<pre class='brush:php;toolbar:false;'>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;地图展示&lt;/title&gt; &lt;script type=&quot;text/javascript&quot; src=&quot;static/baidu_map.js&quot;&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div id=&quot;map&quot; style=&quot;width:800px;height:600px;&quot;&gt;&lt;/div&gt; &lt;script type=&quot;text/javascript&quot;&gt; // 获取地理位置信息 var lng = {{ location[0] }}; var lat = {{ location[1] }}; // 创建地图 var map = new BMap.Map(&quot;map&quot;); var point = new BMap.Point(lng, lat); map.centerAndZoom(point, 15); // 添加标记 var marker = new BMap.Marker(point); map.addOverlay(marker); &lt;/script&gt; &lt;/body&gt; &lt;/html&gt;</pre><p>In the above code, we used a <code><div> tag to display the map and <code>{{ location[0] }} and {{ location[1] }} these two template variables to obtain the values ​​of longitude and latitude.

Finally, we need to modify the previous get_location function, pass the obtained latitude and longitude information to the template variables, and render the template file in the index route.

@app.route('/')
def index():
    address = '北京市中关村'
    location = get_location(address)
    return render_template('index.html', location=location)

In the above code, we assume that the address the user wants to query is Zhongguancun, Beijing, and then obtain the longitude and latitude information of the address and pass it to locationTemplate variables.

So far, we have completed the code example for implementing geographical positioning and map display functions through the Webman framework.

Summary:

This article introduces how to use the Webman framework to implement geographical location positioning and map display functions. By using the Webman framework, we can easily develop various functions and provide rich expansion capabilities. I hope this article is helpful to you. If you have any questions, please leave a message for discussion.