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How to build an online voting system using WebMan technology

王林Original: 2023-08-26 22:43:441100browse

How to use WebMan technology to build an online voting system

Introduction:
With the continuous popularity of the Internet, the number of Internet users is also increasing rapidly. Whether it is the government, enterprises, institutions or individuals, they have gradually realized the importance of online voting systems. This article will introduce how to use WebMan technology to build a simple and practical online voting system, and attach relevant code examples. I hope that readers can master basic WebMan technology by reading this article and apply it to actual projects.

1. Implementation Ideas
The implementation of the online voting system requires the development of both front-end and back-end parts. The front-end is mainly responsible for displaying voting options and obtaining the user's voting choices, while the back-end is responsible for receiving the data passed by the front-end and saving the voting results in the database. Based on this idea, we can start specific development work.

2. Front-end development

Creating a front-end page
First, we need to create a front-end page to display voting options and obtain user voting choices. You can use HTML and CSS to implement the basic structure and style of the page.

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>在线投票系统</title>
    <style>
        /* 样式代码 */
    </style>
</head>
<body>
    <h1>在线投票系统</h1>
    <form>
        <label for="option1">选项1：</label>
        <input type="radio" name="option" id="option1" value="1">
        <br>
        <label for="option2">选项2：</label>
        <input type="radio" name="option" id="option2" value="2">
        <br>
        <label for="option3">选项3：</label>
        <input type="radio" name="option" id="option3" value="3">
        <br>
        <button type="submit">提交</button>
    </form>
</body>
</html>

Add event listener
In order to obtain the user's voting choice, we need to add event listener in the front-end code. When the user clicks the submit button, the submit event is fired and the value of the selected option is passed to the backend.

<script>
    document.querySelector('form').addEventListener('submit', function(event) {
        event.preventDefault();
        var selectedOption = document.querySelector('input[name="option"]:checked');
        if (selectedOption) {
            var selectedValue = selectedOption.value;
            // 将选项值传递给后端处理
            submitVote(selectedValue);
        } else {
            alert('请选择一个选项');
        }
    });

    function submitVote(option) {
        // 使用Ajax将选项值传递给后端
        // 代码示例略
    }
</script>

3. Back-end development

Create back-end API
Next, we need to create a back-end API to receive the data passed by the front-end, and then The voting results are saved to the database. APIs can be created using backend frameworks such as Node.js or Flask.

// Node.js示例代码
const express = require('express');
const app = express();

app.post('/vote', function(req, res) {
    var option = req.body.option; // 前端传递的选项值
    // 将投票结果保存到数据库中
    // 代码示例略
    res.send('投票成功');
});

app.listen(3000, function() {
    console.log('服务器已启动');
});

Handling CORS cross-domain issues
Since the front-end and back-end are in different domains, CORS (cross-domain resource sharing) issues will be involved. In order to avoid browser security restrictions, we need to add relevant processing in the backend code.

// Node.js示例代码
app.use(function(req, res, next) {
    res.header('Access-Control-Allow-Origin', '*'); // 允许任意域的请求
    res.header('Access-Control-Allow-Methods', 'GET,POST'); // 允许跨域的请求方法
    res.header('Access-Control-Allow-Headers', 'Content-Type'); // 允许传递指定的请求头
    next();
});

4. Deployment and testing

Deploy the front-end page
Deploy the front-end page to any static file server, such as Nginx, Apache, etc.
Deploy the backend API
Deploy the backend API to a server that supports Node.js or Flask. Make sure the API is running properly and can be accessed via the URL.
Test
Visit the front-end page in the browser, select the corresponding option and click the submit button. If everything is fine, the backend API should be able to receive the data passed by the frontend and save the voting results to the database.

Conclusion:
Through the introduction and code examples of this article, I believe that readers have understood how to use WebMan technology to build a simple online voting system. Of course, this is just a basic example. The actual voting system also needs to consider issues such as security and performance optimization. It is hoped that readers can apply WebMan technology to more complex projects through further study and practice to achieve more functions and innovations.

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