Database
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How to implement a simple map marking function using MySQL and JavaScript
How to implement a simple map marking function using MySQL and JavaScript
How to use MySQL and JavaScript to implement a simple map marking function
The map marking function is very common in modern web applications. It can be used to mark specific locations, Display location information or display geographic data, etc. In this article, we'll cover how to write a simple map marker function using a MySQL database and JavaScript, and provide specific code examples.
1. Preparation
Before we start, we need to prepare some basic environments and tools:
- MySQL database: used to store the location information marked on the map.
- Some basic front-end technology tools, such as HTML, CSS and JavaScript.
- A basic server environment, such as Apache or Nginx, is used to run our code.
2. Create database and table
First, we need to create a table in the MySQL database to store the location information of map markers. We can use the following SQL statement to create a table named "markers":
CREATE TABLE `markers` ( `id` INT(11) NOT NULL AUTO_INCREMENT, `name` VARCHAR(50) NOT NULL, `lat` FLOAT(10,6) NOT NULL, `lng` FLOAT(10,6) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
This table contains four fields: id, name, lat and lng. The id field is an auto-incremented primary key, the name field is used to store the name of the tag, and the lat and lng fields are used to store the latitude and longitude of the tag respectively.
3. Write the front-end code
Next, we can write the front-end HTML and JavaScript code to implement the map marking function.
- HTML code
In the HTML code, we need a map container to display the map and add an "Add Marker" button for adding new markers. For example:
<div id="map"></div> <button onclick="addMarker()">添加标记</button>
- JavaScript code
In the JavaScript code, we need to use the map API to load the map and implement the function of adding markers. Here we use the Google Maps API to demonstrate. First, we need to add a
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